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Acharya GR, Tyagi M, Mamontov E, Hoffmann PM. Diffusion Dynamics of Water and Ethanol in Graphene Oxide. J Phys Chem B 2023; 127:7384-7393. [PMID: 37556231 DOI: 10.1021/acs.jpcb.2c08960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
We utilized the momentum transfer (Q)-dependence of quasi-elastic neutron scattering (QENS) to measure the dynamics of water and ethanol confined in graphene oxide (GO) powder or membranes at different temperatures and in different orientations. We found reduced diffusivities (up to 30% in the case of water) and a depression of dynamic transition temperatures. While water showed near Arrhenius behavior with an almost bulk-like activation barrier in a temperature range of 280-310 K, the diffusivity of ethanol showed little temperature dependence. For both water and ethanol, we found evidence for immobile and mobile fractions of the confined liquid. The mobile fraction exhibited jump diffusion, with a jump length consistent with the expected average spacing of hydroxide groups in the GO surfaces. From anisotropy measurements, we found weak anisotropy in the diffusivity of the mobile species and in the fraction and geometry of immobile species.
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Affiliation(s)
- Gobin Raj Acharya
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008 MS6473, Oak Ridge, Tennessee 37831, United States
| | - Peter M Hoffmann
- Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, United States
- Department of Physical Sciences, Embry-Riddle Aeronautical University, Daytona Beach, Florida 32114, United States
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2
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Witherspoon VJ, Ito K, Snyder CR, Tyagi M, Martin TB, Beaucage PA, Nieuwendaal RC, Vallery RS, Gidley DW, Wilbur JD, Welsh D, Stafford CM, Soles CL. Correlating the Diffusion of Water to Performance in Model Reverse Osmosis Polyamides with Controlled Crosslink Densities. J Memb Sci 2023; 678:10.1016/j.memsci.2023.121670. [PMID: 37465550 PMCID: PMC10350966 DOI: 10.1016/j.memsci.2023.121670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
We systematically reduce the cross-link density of a PA network based on m-phenylene diamine by substituting a fraction of the trifunctional trimesoyl chloride cross-linking agent with a difunctional isophthaloyl analog that promotes chain extension, in order to elucidate robust design cues for improving the polyamide (PA) separation layer in reverse osmosis (RO) membranes for desalination. Thin films of these model PA networks are fully integrated into a composite membrane and evaluated in terms of their water flux and salt rejection. By incorporating 15 mol % of the difunctional chain extender, we reduce the cross-link density of the network by a factor of two, which leads to an 80 % increase in the free or unreacted amine content. The resulting swelling of the PA network in liquid water increases by a factor of two accompanied by a 30 % increase in the salt passage through the membrane. Surprisingly, this leads to a 30 % decrease in the overall permeance of water through the membrane. This conundrum is resolved by quantifying the microscopic diffusion coefficient of water inside the PA network with quasi-elastic neutron scattering. In the highest and lowest cross-link density networks, water shows strong signatures of confined diffusion. At short length scales, the water exhibits a translational diffusion that is consistent with the jump-diffusion mechanism. This translational diffusion coefficient is approximately five times slower in the lowest cross-linked density network, consistent with the reduced water permeance. This is interpreted as water molecules interacting more strongly with the increased free amine content. Over longer length scales the water diffusion is confined, exhibiting mobility that is independent of length scale. The length scales of confinement from the quasi-elastic neutron scattering experiments at which this transition from confined to translational diffusion occurs is on the order of (5 to 6) Å, consistent with complementary X-ray scattering, small angle neutron scattering, and positron annihilation lifetime spectroscopy measurements. The confinement appears to come from heterogeneities in the average inter-atomic distances, suggesting that diffusion occurs by water bouncing between chains and occasionally sticking to the polar functional groups. The results obtained here are compared with similar studies of water diffusion through both rigid porous silicates and ion exchange membranes, revealing robust design cues for engineering high-performance RO membranes.
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Affiliation(s)
- Velencia J. Witherspoon
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
- Current address: Section for Quantitative Imaging and Tissue Science, Eunice Kennedy Shriver National Institute of Child Health and Human Development
| | - Kanae Ito
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
- Current address: Industrial Application Division, Spring-8, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Chad R. Snyder
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD
| | - Tyler B. Martin
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD
| | - Peter A. Beaucage
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD
| | - Ryan C. Nieuwendaal
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
| | | | - David W. Gidley
- Physics Department, University of Michigan, 450 Church Street, Ann Arbor, MI
| | | | | | - Christopher M. Stafford
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Christopher L. Soles
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
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3
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Tyagi M, Shah U, Patel G, Toshniwal V, Bhongade R, Sharma P. THE IMPACT OF SLEEP ON PHYSICAL AND MENTAL HEALTH: IMPORTANCE OF HEALTHY SLEEP HABITS. Georgian Med News 2023:89-94. [PMID: 37522781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
Sleep is an important part of health, and when you go to sleep, how long you sleep, and how well you sleep all have a big impact on your health. Sleep may be required for regulating the body's metabolism, feelings, function, memory storage, brain recovery, and learning. Because of how important these processes are, sleep should be seen as just as important to health as what you eat and how much you exercise. Adults' sleep generally gets shorter and less restful, their sleep starts later and is more broken up, they have more sleep problems, and their rest-activity rhythms get weaker. In addition to receiving enough sleep (quality), healthy sleep habits also include maintaining a consistent sleep schedule. Ninety male college students with varying sleep schedules were analyzed for their physical and emotional well-being. By using factor analysis to categorize individuals' sleeping patterns across three dimensions regularity, quality, and quantity. We were able to develop sleep-habit measures. Clustering identified four distinct patterns of sleep behavior: good sleep was defined by regular, high-quality sleep despite being of comparatively brief duration; long sleep was predictable, fairly lengthy, but of minimal quality; short sleep was of excellent quality despite being short and irregular; and poor sleep was erratic, low-quality, and relatively long. The excellent sleepers also had reduced diastolic and systolic and a smaller means waist measurement. In addition, the poor sleepers had the lowest average MCS scores of all of the study groups. Poor sleepers also had the lowest mean scores on the Subjective Depression Scale (SDS). Issues involving glucose or lipid absorption were also more common in the short-term and long poor-sleep categories. Without restful sleep and a regular bedtime routine, it is impossible to maintain excellent mental and physical wellness, even if time and sleep are maintained constantly. Therefore, to produce suitable sleep recommendations for enhanced mental and physical health, we evaluated not only the quantity of sleep but also its consistency and high quality.
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Affiliation(s)
- M Tyagi
- 1Department of Psychitary, Teerthanker Mahaveer University, Moradabad, Uttar Pradesh, India
| | - U Shah
- 2Department of Genetics, School of Sciences, JAIN (Deemed-to-be University), Karnataka, India
| | - G Patel
- 3Department of Community Medicine, Parul University, PO Limda, Tal. Waghodia, District Vadodara, Gujarat, India
| | - V Toshniwal
- 4Department of Nursing, IIMT University, Meerut, Uttar Pradesh, India
| | - R Bhongade
- 5Department of Ayurveda, Sanskriti University, Mathura, Uttar Pradesh, India
| | - P Sharma
- 6Department of Pharmacy, Vivekananda Global University, Jaipur, India
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Zhang L, Liu Z, Yang C, García Sakai V, Tyagi M, Hong L. Conduction Mechanism in Graphene Oxide Membranes with Varied Water Content: From Proton Hopping Dominant to Ion Diffusion Dominant. ACS Nano 2022; 16:13771-13782. [PMID: 35993828 DOI: 10.1021/acsnano.2c00686] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Proton conductors, particularly hydrated solid membranes, have various applications in sensors, fuel cells, and cellular biological systems. Unraveling the intrinsic proton transfer mechanism is critical for establishing the foundation of proton conduction. Two scenarios on electrical conduction, the Grotthuss and the vehicle mechanisms, have been reported by experiments and simulations. But separating and quantifying the contributions of these two components from experiments is difficult. Here, we present the conductive behavior of a two-dimensional layered proton conductor, graphene oxide membrane (GOM), and find that proton hopping is dominant at low water content, while ion diffusion prevails with increasing water content. This change in the conduction mechanism is attributable to the layers of water molecules in GOM nanosheets. The overall conductivity is greatly improved by forming one layer of water molecules. It reaches the maximum with two layers of water molecules, resulting from creating a complete hydrogen-bond network within GOM. When more than two layers of water molecules enter the GOM nanosheets, inducing the breakage of the ordered lamellar structure, protons spread in both in-plane and out-of-plane directions inside the GOM. Our results validate the existence of two conduction mechanisms and show their distinct contributions to the overall conductivity. Furthermore, these findings provide an optimization strategy for the design of realizing the fast proton transfer in materials with water participation.
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Affiliation(s)
- Lei Zhang
- School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhuo Liu
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
- Shanghai National Center for Applied Mathematics (SJTU Center) and MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Chenxing Yang
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Victoria García Sakai
- Rutherford Appleton Laboratory, ISIS Neutron and Muon Facility, Science and Technology Facilities Council, Didcot OX11 0QX, United Kingdom
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Liang Hong
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
- Shanghai National Center for Applied Mathematics (SJTU Center) and MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
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5
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Elliott JP, Osti NC, Tyagi M, Mamontov E, Liu L, Serrano JM, Cao K, Liu G. Exceptionally Fast Ion Diffusion in Block Copolymer-Based Porous Carbon Fibers. ACS Appl Mater Interfaces 2022; 14:36980-36986. [PMID: 35916606 DOI: 10.1021/acsami.2c12755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Confined ionic liquids in hydrophilic porous media have disrupted lattices and can be divided into two layers: An immobile ion layer adheres to the pore surfaces, and an inner layer exhibits faster mobility than the bulk. In this work, we report the first study of ionic liquids confined in block copolymer-based porous carbon fibers (PCFs) synthesized from polyacrylonitrile-block-polymethyl methacrylate (PAN-b-PMMA). The PCFs contain a network of unimodal mesopores of 13.6 nm in diameter and contain more hydrophilic surface functional groups than previously studied porous carbon. Elastic neutron scattering shows no freezing point for 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) confined in PCFs down to 20 K. Quasi-elastic neutron scattering (QENS) is used to measure the diffusion of [BMIM]BF4 confined in PCFs, which, surprisingly, is 7-fold faster than in the bulk. The unprecedentedly high ion diffusion remarks that PCFs hold exceptional potential for use in electrochemical catalysis, energy conversion, and storage.
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Affiliation(s)
- John P Elliott
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008 MS6455, Oak Ridge, Tennessee 37831, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science, University of Maryland, College Park, Maryland 20742, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008 MS6455, Oak Ridge, Tennessee 37831, United States
| | - Lifeng Liu
- International Iberian Nanotechnology Laboratory (INL), Avenida Mestre José Veiga, 4715-330 Braga, Portugal
| | - Joel M Serrano
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Ke Cao
- Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Guoliang Liu
- Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States
- Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
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6
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Pena-Francesch A, Jung H, Tyagi M, Demirel MC. Diffusive Dynamic Modes of Recombinant Squid Ring Teeth Proteins by Neutron Spectroscopy. Biomacromolecules 2022; 23:3165-3173. [PMID: 35767422 DOI: 10.1021/acs.biomac.2c00266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Stimuli-responsive structural proteins are emerging as promising biocompatible materials for a wide range of biological and nonbiological applications. To understand the physical properties of structural proteins and to replicate their performance in biosynthetic systems, there is a need to understand the molecular mechanisms and relationships that regulate their structure, dynamics, and properties. Here, we study the dynamics of a recombinant squid-inspired protein from Loligo vulgaris (Lv18) by elastic and quasielastic neutron scattering (QENS) to understand the connection between nanostructure, chain dynamics, and mechanical properties. Lv18 is a semicrystalline structural protein, which is plasticized by water above its glass transition temperature at 35 °C. Elastic scans revealed an increased protein chain mobility upon hydration, superimposed dynamic processes, and a decrease in dynamic transition temperatures. Further analysis by QENS revealed that while dry Lv18 protein dynamics are dominated by localized methyl group rotations, hydrated Lv18 dynamics are dominated by the confined diffusion of flexible chains within a β-sheet nanocrystalline network (8 Å of confinement radius). Our findings establish a relationship between the segment block architecture of Lv18, the diffusive motions within the protein structure, and the mechanical properties of recombinant squid proteins, which will advance the molecular design of novel high-performance protein-inspired materials with tailored dynamics and mechanical properties.
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Affiliation(s)
- Abdon Pena-Francesch
- Department of Materials Science and Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.,Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Huihun Jung
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899, United States.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Melik C Demirel
- Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, United States.,Materials Research Institute, and Huck Institutes of Life Sciences, Pennsylvania State University, University Park, Pennsylvania 16802, United States
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7
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Moon HJ, Carrillo JM, Leisen J, Sumpter BG, Osti NC, Tyagi M, Jones CW. Understanding the Impacts of Support-Polymer Interactions on the Dynamics of Poly(ethyleneimine) Confined in Mesoporous SBA-15. J Am Chem Soc 2022; 144:11664-11675. [PMID: 35729771 DOI: 10.1021/jacs.2c03028] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Supported amines are a promising class of CO2 sorbents offering large uptake capacities and fast uptake rates. Among supported amines, poly(ethyleneimine) (PEI) physically impregnated in the mesopores of SBA-15 silica is widely used. Within these composite materials, the chain dynamics and morphologies of PEI strongly influence the CO2 capture performance, yet little is known about chain and macromolecule mobility in confined pores. Here, we probe the impact of the support-PEI interactions on the dynamics and structures of PEI at the support interface and the corresponding impact on CO2 uptake performance, which yields critical structure-property relationships. The pore walls of the support are grafted with organosilanes with different chemical end groups to differentiate interaction modes (spanning from strong attraction to repulsion) between the pore surface and PEI. Combinations of techniques, such as quasi-elastic neutron scattering (QENS), 1H T1-T2 relaxation correlation solid-state NMR, and molecular dynamics (MD) simulations, are used to comprehensively assess the physical properties of confined PEI. We hypothesized that PEI would have faster dynamics when subjected to less attractive or repulsive interactions. However, we discover that complex interfacial interactions resulted in complex structure-property relationships. Indeed, both the chain conformation of the surface-grafted chains and of the PEI around the surface influenced the chain mobility and CO2 uptake performance. By coupling knowledge of the dynamics and distributions of PEI with CO2 sorption performance and other characteristics, we determine that the macroscopic structures of the hybrid materials dictate the first rapid CO2 uptake, and the rate of CO2 sorption during the subsequent gradual uptake stage is determined by PEI chain motions that promote diffusive jumps of CO2 through PEI-packed domains.
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Affiliation(s)
- Hyun June Moon
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Jan-Michael Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Johannes Leisen
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Bobby G Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899, United States.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.,School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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8
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Liu S, Li R, Tyagi M, Akcora P. Confinement Effects in Dynamics of Ionic Liquids with Polymer-Grafted Nanoparticles. Chemphyschem 2022; 23:e202200219. [PMID: 35676199 DOI: 10.1002/cphc.202200219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 06/07/2022] [Indexed: 11/07/2022]
Abstract
Ionic liquid mixed with poly(methyl methacrylate)-grafted nanoparticle aggregates at low particle concentrations was shown to exhibit different dynamics and ionic conductivity than that of pure ionic liquid in our previous studies. In this work, we report on the quasi-elastic neutron scattering results on ionic liquid containing polymer-grafted nanoparticles at the higher particle concentration. The diffusivity of imidazolium (HMIM + ) cations of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (HMIM-TFSI) in the presence of poly(methyl methacrylate)-grafted iron oxide nanoparticles and the ionic conductivity of solutions were discussed through the confinement. Analysis of the elastic incoherent structure factor suggested the confinement radius decreased with the addition of grafted particles in HMIM-TFSI/solvent mixture, indicating the confinement that is induced by the high concentration of grafted particles, shrinks the HMIM-TFSI restricted volume. We further conjecture that this enhanced diffusivity occurs as a result of the local ordering of cations within aggregates of poly(methyl methacrylate)-grafted particles.
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Affiliation(s)
- Siqi Liu
- 1 Castle Point on Hudson, Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, McLean Hall 415, 07030, Hoboken, NJ, USA
| | - Ruhao Li
- 1 Castle Point on Hudson, Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, McLean Hall 415, 07030, Hoboken, NJ, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, 100 Bureau Dr, 20899, Gaithersburg, MD, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, 20742, Maryland, MD, USA
| | - Pinar Akcora
- 1 Castle Point on Hudson, Department of Chemical Engineering and Materials Science, Stevens Institute of Technology, McLean Hall 415, 07030, Hoboken, NJ, USA
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Foglia F, Berrod Q, Clancy AJ, Smith K, Gebel G, Sakai VG, Appel M, Zanotti JM, Tyagi M, Mahmoudi N, Miller TS, Varcoe JR, Periasamy AP, Brett DJL, Shearing PR, Lyonnard S, McMillan PF. Disentangling water, ion and polymer dynamics in an anion exchange membrane. Nat Mater 2022; 21:555-563. [PMID: 35301475 DOI: 10.1038/s41563-022-01197-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 01/11/2022] [Indexed: 05/12/2023]
Abstract
Semipermeable polymeric anion exchange membranes are essential for separation, filtration and energy conversion technologies including reverse electrodialysis systems that produce energy from salinity gradients, fuel cells to generate electrical power from the electrochemical reaction between hydrogen and oxygen, and water electrolyser systems that provide H2 fuel. Anion exchange membrane fuel cells and anion exchange membrane water electrolysers rely on the membrane to transport OH- ions between the cathode and anode in a process that involves cooperative interactions with H2O molecules and polymer dynamics. Understanding and controlling the interactions between the relaxation and diffusional processes pose a main scientific and critical membrane design challenge. Here quasi-elastic neutron scattering is applied over a wide range of timescales (100-103 ps) to disentangle the water, polymer relaxation and OH- diffusional dynamics in commercially available anion exchange membranes (Fumatech FAD-55) designed for selective anion transport across different technology platforms, using the concept of serial decoupling of relaxation and diffusional processes to analyse the data. Preliminary data are also reported for a laboratory-prepared anion exchange membrane especially designed for fuel cell applications.
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Affiliation(s)
- Fabrizia Foglia
- Department of Chemistry, Christopher Ingold Laboratory, University College London, London, UK.
| | - Quentin Berrod
- Université Grenoble Alpes, CNRS, CEA, IRIG-SyMMES, Grenoble, France
| | - Adam J Clancy
- Department of Chemistry, Christopher Ingold Laboratory, University College London, London, UK
| | - Keenan Smith
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London, UK
| | - Gérard Gebel
- Université Grenoble Alpes, CNRS, CEA, IRIG-SyMMES, Grenoble, France
| | - Victoria García Sakai
- ISIS Neutron and Muon Source, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, UK
| | | | - Jean-Marc Zanotti
- Laboratoire Léon Brillouin (CEA-CNRS), Université Paris-Saclay, CEA Saclay, Gif-sur-Yvette Cedex, France
| | - Madhusudan Tyagi
- NIST Center for Neutron Research (NCNR), National Institute of Standards and Technology, Gaithersburg, MD, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA
| | - Najet Mahmoudi
- ISIS Neutron and Muon Source, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, UK
| | - Thomas S Miller
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London, UK
| | - John R Varcoe
- Department of Chemistry, University of Surrey, Guildford, UK
| | | | - Daniel J L Brett
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London, UK
| | - Paul R Shearing
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London, UK
| | - Sandrine Lyonnard
- Université Grenoble Alpes, CNRS, CEA, IRIG-SyMMES, Grenoble, France.
| | - Paul F McMillan
- Department of Chemistry, Christopher Ingold Laboratory, University College London, London, UK
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Osti NC, Thapaliya BP, Matsumoto RA, Bansal A, Lin X, Cummings PT, Tyagi M, Dai S, Mamontov E. Direct Correlation of the Salt-Reduced Diffusivities of Organic Solvents with the Solvent's Mole Fraction. J Phys Chem Lett 2022; 13:2845-2850. [PMID: 35324215 DOI: 10.1021/acs.jpclett.2c00487] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) in organic solvents (especially propylene carbonate) has demonstrated extraordinary pseudocapacitive performance as an electrolyte in the supercapacitor configuration ( Nat. Energy 2019, 4, 241-248). However, the influence of the solvated ions on the diffusivity of the solvent molecules is yet to be understood. We examine the impact of LiTFSI on the diffusivity in five organic solvents: acetonitrile (ACN), tetrahydrofuran (THF), methanol (MeOH), dimethyl sulfoxide (DMSO), and propylene carbonate (PC) using a combination of neutron scattering, conductivity measurements, and molecular dynamics simulations. The extent of the diffusivity reduction in the concentration regime of ≤1 M directly correlates with the solvent mole fraction at which the solvation shells around Li+ ions are of similar size in all the solvents, resulting in a universal ∼50% reduction in the solvent diffusivity. These results provide guidance for formulation of the new electrolytes to enhance the performance of energy storage devices.
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Affiliation(s)
- Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, PO BOX 2008 MS6455, Oak Ridge, Tennessee 37831, United States
| | - Bishnu Prasad Thapaliya
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Institute for Advanced Materials & Manufacturing and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Ray A Matsumoto
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, 2201 West End Avenue, Nashville, Tennessee 37235, United States
| | - Arjun Bansal
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, 2201 West End Avenue, Nashville, Tennessee 37235, United States
| | - Xiaobo Lin
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, 2201 West End Avenue, Nashville, Tennessee 37235, United States
| | - Peter T Cummings
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, 2201 West End Avenue, Nashville, Tennessee 37235, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science, University of Maryland, College Park, Maryland 20742, United States
| | - Sheng Dai
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Institute for Advanced Materials & Manufacturing and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, PO BOX 2008 MS6455, Oak Ridge, Tennessee 37831, United States
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11
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Spittle S, Poe D, Doherty B, Kolodziej C, Heroux L, Haque MA, Squire H, Cosby T, Zhang Y, Fraenza C, Bhattacharyya S, Tyagi M, Peng J, Elgammal RA, Zawodzinski T, Tuckerman M, Greenbaum S, Gurkan B, Burda C, Dadmun M, Maginn EJ, Sangoro J. Author Correction: Evolution of microscopic heterogeneity and dynamics in choline chloride-based deep eutectic solvents. Nat Commun 2022; 13:1081. [PMID: 35194051 PMCID: PMC8864022 DOI: 10.1038/s41467-022-28671-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Stephanie Spittle
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Derrick Poe
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Brian Doherty
- Department of Chemistry, New York University, New York, NY, 10003, USA
| | - Charles Kolodziej
- Department of Chemistry, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Luke Heroux
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA.,Oak Ridge National Laboratory, Neutron Sciences Division, Oak Ridge, TN, 37830, USA
| | - Md Ashraful Haque
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA
| | - Henry Squire
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Tyler Cosby
- School of Mathematics and Sciences, University of Tennessee Southern, Pulaski, TN, 44106, USA
| | - Yong Zhang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Carla Fraenza
- Department of Physics and Astronomy, Hunter College, New York, NY, 10065, USA
| | | | - Madhusudan Tyagi
- NIST Center for Neutron Research, Gaithersburg, MD, 20899, USA.,Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA
| | - Jing Peng
- School of Materials Science and Engineering, Beihang University, Beijing, China
| | - Ramez A Elgammal
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Thomas Zawodzinski
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Mark Tuckerman
- Department of Chemistry, New York University, New York, NY, 10003, USA.,Courant Institute of Mathematical Science, New York University, New York, NY, 10012, USA.,NYU-ECNU Center for Computational Chemistry at NYU Shanghai, Shanghai, China
| | - Steve Greenbaum
- Department of Physics and Astronomy, Hunter College, New York, NY, 10065, USA
| | - Burcu Gurkan
- Department of Chemical and Biomolecular Engineering, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Clemens Burda
- Department of Chemistry, Case Western Reserve University, Cleveland, OH, 44106, USA
| | - Mark Dadmun
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996, USA.,Oak Ridge National Laboratory, Chemical Sciences Division, Oak Ridge, TN, 37830, USA
| | - Edward J Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA.
| | - Joshua Sangoro
- Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN, 37996, USA.
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12
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Koegel AA, Mozur EM, Oswald IWH, Jalarvo NH, Prisk TR, Tyagi M, Neilson JR. Correlating Broadband Photoluminescence with Structural Dynamics in Layered Hybrid Halide Perovskites. J Am Chem Soc 2022; 144:1313-1322. [PMID: 35029372 DOI: 10.1021/jacs.1c11217] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The emission of white light from a single material is atypical and is of interest for solid-state lighting applications. Broadband light emission has been observed in some layered perovskite derivatives, A2PbBr4 (A = R-NH3+), and correlates with static structural distortions corresponding to out-of-plane tilting of the lead bromide octahedra. While materials with different organic cations can yield distinct out-of-plane tilts, the underlying origin of the octahedral tilting remains poorly understood. Using high energy resolution (e.g., quasi-elastic) neutron scattering, this contribution details the rotational dynamics of the organic cations in A2PbBr4 materials where A = n-butylammonium (nBA), 1,8-diaminooctammonium (ODA), and 4-aminobutyric acid (GABA). The organic cation dynamics differentiate (nBA)2PbBr4 from (ODA)PbBr4 or (GABA)2PbBr4 in that the larger spatial extent of dynamics of nBA yields a larger effective cation radius. The larger effective volume of the nBA cation in (nBA)2PbBr4 yields a closer to ideal A-site geometry, preventing the out-of-plane tilt and broadband luminescence. In all three compounds, we observe hydrogen dynamics attributed to rotation of the ammonium headgroup and at a time scale faster than the white light photoluminescence studied by time-correlated single photon counting spectroscopy. This supports a previous assignment of the broadband emission as resulting from a single ensemble, such that the emissive excited state experiences many local structures faster than the emissive decay. The findings presented here highlight the role of the organic cation and its dynamics in hybrid organic-inorganic perovskites and white light emission.
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Affiliation(s)
- Alexandra A Koegel
- Colorado State University, Department of Chemistry, Fort Collins, Colorado 80523-1872, United States
| | - Eve M Mozur
- Colorado State University, Department of Chemistry, Fort Collins, Colorado 80523-1872, United States
| | - Iain W H Oswald
- Colorado State University, Department of Chemistry, Fort Collins, Colorado 80523-1872, United States
| | - Niina H Jalarvo
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Timothy R Prisk
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States.,Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - James R Neilson
- Colorado State University, Department of Chemistry, Fort Collins, Colorado 80523-1872, United States
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13
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Zheng L, Liu Z, Zhang Q, Li S, Huang J, Zhang L, Zan B, Tyagi M, Cheng H, Zuo T, Sakai VG, Yamada T, Yang C, Tan P, Jiang F, Chen H, Zhuang W, Hong L. Universal dynamical onset in water at distinct material interfaces. Chem Sci 2022; 13:4341-4351. [PMID: 35509458 PMCID: PMC9006901 DOI: 10.1039/d1sc04650k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 03/18/2022] [Indexed: 12/13/2022] Open
Abstract
Interfacial water remains liquid and mobile much below 0 °C, imparting flexibility to the encapsulated materials to ensure their diverse functions at subzero temperatures. However, a united picture that can describe the dynamical differences of interfacial water on different materials and its role in imparting system-specific flexibility to distinct materials is lacking. By combining neutron spectroscopy and isotope labeling, we explored the dynamics of water and the underlying substrates independently below 0 °C across a broad range of materials. Surprisingly, while the function-related anharmonic dynamical onset in the materials exhibits diverse activation temperatures, the surface water presents a universal onset at a common temperature. Further analysis of the neutron experiment and simulation results revealed that the universal onset of water results from an intrinsic surface-independent relaxation: switching of hydrogen bonds between neighboring water molecules with a common energy barrier of ∼35 kJ mol−1. We demonstrated that the dynamical onset of interfacial water is an intrinsic property of water itself, resulting from a surface independent relaxation process in water with an approximately universal energy barrier of ∼35 kJ mol−1.![]()
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Affiliation(s)
- Lirong Zheng
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 35000, China
| | - Zhuo Liu
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Qiang Zhang
- College of Chemistry and Materials Science, Inner Mongolia University for Nationalities, Tongliao, Inner Mongolia 028043, China
| | - Song Li
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Juan Huang
- School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Lei Zhang
- School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Bing Zan
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
| | - He Cheng
- China Spallation Neutron Source (CSNS), Institute of High Energy Physics (IHEP), Chinese Academy of Science (CAS), Dongguan 523803, China
- Dongguan Institute of Neutron Science (DINS), Dongguan 523808, China
| | - Taisen Zuo
- China Spallation Neutron Source (CSNS), Institute of High Energy Physics (IHEP), Chinese Academy of Science (CAS), Dongguan 523803, China
- Dongguan Institute of Neutron Science (DINS), Dongguan 523808, China
| | - Victoria García Sakai
- ISIS Pulsed Neutron and Muon Source, Rutherford Appleton Laboratory, Science & Technology Facilities Council, Didcot OX11 0QX, UK
| | - Takeshi Yamada
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society, 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan
| | - Chenxing Yang
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Pan Tan
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Fan Jiang
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hao Chen
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 35000, China
| | - Wei Zhuang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 35000, China
- Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China
| | - Liang Hong
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center), MOE-LSC, Shanghai Jiao Tong University, Shanghai 200240, China
- Shanghai Artificial Intelligence Laboratory, Shanghai 200232, China
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14
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Qian X, Han D, Zheng L, Chen J, Tyagi M, Li Q, Du F, Zheng S, Huang X, Zhang S, Shi J, Huang H, Shi X, Chen J, Qin H, Bernholc J, Chen X, Chen LQ, Hong L, Zhang QM. High-entropy polymer produces a giant electrocaloric effect at low fields. Nature 2021; 600:664-669. [PMID: 34937898 DOI: 10.1038/s41586-021-04189-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Accepted: 10/26/2021] [Indexed: 11/09/2022]
Abstract
More than a decade of research on the electrocaloric (EC) effect has resulted in EC materials and EC multilayer chips that satisfy a minimum EC temperature change of 5 K required for caloric heat pumps1-3. However, these EC temperature changes are generated through the application of high electric fields4-8 (close to their dielectric breakdown strengths), which result in rapid degradation and fatigue of EC performance. Here we report a class of EC polymer that exhibits an EC entropy change of 37.5 J kg-1 K-1 and a temperature change of 7.5 K under 50 MV m-1, a 275% enhancement over the state-of-the-art EC polymers under the same field strength. We show that converting a small number of the chlorofluoroethylene groups in poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) terpolymer into covalent double bonds markedly increases the number of the polar entities and enhances the polar-nonpolar interfacial areas of the polymer. The polar phases in the polymer adopt a loosely correlated, high-entropy state with a low energy barrier for electric-field-induced switching. The polymer maintains performance for more than one million cycles at the low fields necessary for practical EC cooling applications, suggesting that this strategy may yield materials suitable for use in caloric heat pumps.
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Affiliation(s)
- Xiaoshi Qian
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China. .,Shanghai Jiao Tong University Jiangsu ZhongGuanCun Research Institute, Liyang, Jiangsu, China.
| | - Donglin Han
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Lirong Zheng
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center) and MOE-LSC, Shanghai Jiao Tong University, Shanghai, China
| | - Jie Chen
- Frontiers Science Center for Transformative Molecules, Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.,Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA
| | - Qiang Li
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Feihong Du
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Shanyu Zheng
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Xingyi Huang
- Frontiers Science Center for Transformative Molecules, Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China.
| | | | - Junye Shi
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Houbing Huang
- School of Materials Science and Engineering and Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, China.
| | - Xiaoming Shi
- School of Materials Science and Engineering and Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, China
| | - Jiangping Chen
- Institute of Refrigeration and Cryogenics, Interdisciplinary Research Centre for Metamaterials and Intelligent Systems, State Key Laboratory of Mechanical System and Vibration, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Hancheng Qin
- Department of Physics, North Carolina State University, Raleigh, NC, USA
| | - Jerzy Bernholc
- Department of Physics, North Carolina State University, Raleigh, NC, USA
| | - Xin Chen
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA
| | - Long-Qing Chen
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA
| | - Liang Hong
- School of Physics and Astronomy, Institute of Natural Sciences, Shanghai National Center for Applied Mathematics (SJTU Center) and MOE-LSC, Shanghai Jiao Tong University, Shanghai, China.
| | - Q M Zhang
- School of Electrical Engineering and Computer Science and Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA, USA
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15
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Salatto D, Carrillo JMY, Endoh MK, Taniguchi T, Yavitt BM, Masui T, Kishimoto H, Tyagi M, Ribbe AE, Garcia Sakai V, Kruteva M, Sumpter BG, Farago B, Richter D, Nagao M, Koga T. Structural and Dynamical Roles of Bound Polymer Chains in Rubber Reinforcement. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tomomi Masui
- Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Alexander E. Ribbe
- Department for Polymer Science & Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Victoria Garcia Sakai
- ISIS Pulsed Neutron and Muon Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, U.K
| | - Margarita Kruteva
- Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bela Farago
- Institut Laue−Langevin, 6 rue Jules Horowitz, BP 156-38042, Grenoble Cedex 9 38000, France
| | - Dieter Richter
- Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Michihiro Nagao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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16
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Darvishi S, Nazeer MA, Tyagi M, Zhang Q, Narayanan S, Kizilel S, Senses E. Nonlinear Architectures Can Alter the Dynamics of Polymer–Nanoparticle Composites. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Saeid Darvishi
- Department of Chemical and Biological Engineering, Koc University, Sariyer, Istanbul 34450, Turkey
| | - Muhammad Anwaar Nazeer
- Department of Chemical and Biological Engineering, Koc University, Sariyer, Istanbul 34450, Turkey
- School of Engineering and Technology, National Textile University, Faisalabad 37610, Pakistan
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, United States
| | - Qingteng Zhang
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Suresh Narayanan
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Seda Kizilel
- Department of Chemical and Biological Engineering, Koc University, Sariyer, Istanbul 34450, Turkey
| | - Erkan Senses
- Department of Chemical and Biological Engineering, Koc University, Sariyer, Istanbul 34450, Turkey
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17
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Huang J, Xu Q, Liu Z, Jain N, Tyagi M, Wei DQ, Hong L. Controlling the Substrate Specificity of an Enzyme through Structural Flexibility by Varying the Salt-Bridge Density. Molecules 2021; 26:5693. [PMID: 34577164 PMCID: PMC8470667 DOI: 10.3390/molecules26185693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 09/03/2021] [Accepted: 09/16/2021] [Indexed: 11/17/2022] Open
Abstract
Many enzymes, particularly in one single family, with highly conserved structures and folds exhibit rather distinct substrate specificities. The underlying mechanism remains elusive, the resolution of which is of great importance for biochemistry, biophysics, and bioengineering. Here, we performed a neutron scattering experiment and molecular dynamics (MD) simulations on two structurally similar CYP450 proteins; CYP101 primarily catalyzes one type of ligands, then CYP2C9 can catalyze a large range of substrates. We demonstrated that it is the high density of salt bridges in CYP101 that reduces its structural flexibility, which controls the ligand access channel and the fluctuation of the catalytic pocket, thus restricting its selection on substrates. Moreover, we performed MD simulations on 146 different kinds of CYP450 proteins, spanning distinct biological categories including Fungi, Archaea, Bacteria, Protista, Animalia, and Plantae, and found the above mechanism generally valid. We demonstrated that, by fine changes of chemistry (salt-bridge density), the CYP450 superfamily can vary the structural flexibility of its member proteins among different biological categories, and thus differentiate their substrate specificities to meet the specific biological needs. As this mechanism is well-controllable and easy to be implemented, we expect it to be generally applicable in future enzymatic engineering to develop proteins of desired substrate specificities.
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Affiliation(s)
- Juan Huang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China;
| | - Qin Xu
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;
| | - Zhuo Liu
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China;
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
- Institute for Advanced Study, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Nitin Jain
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville, TN 37996, USA;
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA;
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - Dong-Qing Wei
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China;
- Peng Cheng Laboratory, Shenzhen 518055, China
| | - Liang Hong
- Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai 200240, China;
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
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18
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Miyatsu S, Kofu M, Shigematsu A, Yamada T, Kitagawa H, Lohstroh W, Simeoni G, Tyagi M, Yamamuro O. Quasielastic neutron scattering study on proton dynamics assisted by water and ammonia molecules confined in MIL-53. Struct Dyn 2021; 8:054501. [PMID: 34660845 PMCID: PMC8514252 DOI: 10.1063/4.0000122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Dynamics of water and other small molecules confined in nanoporous materials is one of the current topics in condensed matter physics. One popular host material is a benzenedicarboxylate-bridging metal (III) complex abbreviated to MIL-53, whose chemical formula is M(OH)[C6H2(CO2)2R2] where M = Cr, Al, Fe and R = H, OH, NH2, COOH. These materials absorb not only water but also ammonia molecules. We have measured the quasi-elastic neutron scattering of MIL-53(Fe)-(COOH)2·2H2O and MIL-53(Fe)-(COOH)2·3NH3 which have full guest occupancy and exhibit the highest proton conductivity in the MIL-53 family. In a wide relaxation time region (τ = 10-12-10-8 s), two relaxations with Arrhenius temperature dependence were found in each sample. It is of interest that their activation energies are smaller than those of bulk H2O and NH3 liquids. The momentum transfer dependence of the relaxation time and the temperature dependence of the relaxation intensity suggest that the proton conduction is due to the Grotthuss mechanism with thermally excited H2O and NH3 molecules.
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Affiliation(s)
- Satoshi Miyatsu
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Maiko Kofu
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Akihito Shigematsu
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Teppei Yamada
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hiroshi Kitagawa
- Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Wiebke Lohstroh
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, D-85747 Garching, Germany
| | - Giovanna Simeoni
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, D-85747 Garching, Germany
| | | | - Osamu Yamamuro
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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19
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Jhalaria M, Huang Y, Ruzicka E, Tyagi M, Zorn R, Zamponi M, García Sakai V, Benicewicz B, Kumar S. Activated Transport in Polymer Grafted Nanoparticle Melts. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00601] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mayank Jhalaria
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Yucheng Huang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Eric Ruzicka
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Reiner Zorn
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-1) and Institute for Biological Information Processing (IBI-8), 52425 Jülich, Germany
| | - Michaela Zamponi
- Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science at MLZ, Lichtenbergstr. 1 85748 Garching, Germany
| | - Victoria García Sakai
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK
| | - Brian Benicewicz
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Sanat Kumar
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
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20
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Abstract
For the majority of the water present on earth, the two most important factors influencing its behavior are confinement, in either inorganic or organic matrixes, and the presence of solutes. Here, we investigate the effect of confinement in 3 nm pores on water diffusivity in aqueous solutions with archetypical solutes, a structure making (kosmotrope) NaCl and a structure breaking (chaotrope) KCl, up to 1.0 M in concentration. The water diffusivity in bulk aqueous solutions in such a concentration range is known to decrease very slightly in the presence of NaCl and increase very slightly in the presence of KCl. However, here we observe the water diffusivity in confined H2O-KCl increases by a factor of 2 compared to the pure water diffusivity in the same confinement. This unusually strong cumulative effect of confinement and a structure breaking additive may have profound implications for the mobility and transport of aqueous species in nature.
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Affiliation(s)
- Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bishnu Prasad Thapaliya
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Sheng Dai
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37916, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science, University of Maryland, College Park, Maryland 20742, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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21
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Sepulveda-Medina PI, Tyagi M, Wang C, Vogt BD. Water dynamics within nanostructured amphiphilic statistical copolymers from quasielastic neutron scattering. J Chem Phys 2021; 154:154903. [PMID: 33887940 DOI: 10.1063/5.0045341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Understanding the properties of water under either soft or hard confinement has been an area of great interest, but nanostructured amphiphilic polymers that provide a secondary confinement have garnered significantly less attention. Here, a series of statistical copolymers of 2-hydroxyethyl acrylate (HEA) and 2-(N-ethylperfluorooctane sulfonamido)ethyl methacrylate (FOSM) are swollen to equilibrium in water to form nanostructured physically cross-linked hydrogels to probe the effect of soft confinement on the dynamics of water. Changing the composition of the copolymer from 10 to 21 mol. % FOSM decreases the average size of the assembled FOSM cross-link, but also the spacing between the cross-links in the hydrogels with the mean distance between the FOSM aggregates decreasing from 3.9 to 2.7 nm. The dynamics of water within the hydrogels were assessed with quasielastic neutron scattering. These hydrogels exhibit superior performance for inhibition of water crystallization on supercooling in comparison to analogous hydrogels with different hydrophilic copolymer chemistries. Despite the lower water crystallinity, the self-diffusion coefficient for these hydrogels from the copolymers of HEA and FOSM decreases precipitously below 260 K, which is a counter to the nearly temperature invariant water dynamics reported previously with an analogous hydrogel [Wiener et al., J. Phys. Chem. B 120, 5543 (2016)] that exhibits nearly temperature invariant dynamics to 220 K. These results point to chemistry dependent dynamics of water that is confined within amphiphilic hydrogels, where the interactions of water with the hydrophilic segments can qualitatively alter the temperature dependent dynamics of water in the supercooled state.
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Affiliation(s)
| | - Madhusudan Tyagi
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - Chao Wang
- School of Polymer Science and Polymer Engineering, University of Akron, Akron, Ohio 44325, USA
| | - Bryan D Vogt
- School of Polymer Science and Polymer Engineering, University of Akron, Akron, Ohio 44325, USA
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22
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Takahashi N, Tlemsani C, Pongor L, Rajapakse V, Tyagi M, Wen X, Fasaye G, Schmidt K, Kim C, Rajan A, Swift S, Sciuto L, Vilimas R, Webb S, Nichols S, Figg W, Pommier Y, Calzone K, Steinberg S, Wei J, Guha U, Turner C, Khan J, Thomas A. OA11.05 Whole Exome Sequencing Reveals the Potential Role of Hereditary Predisposition in Small Cell Lung Cancer, a Tobacco-Related Cancer. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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23
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Soles CL, Burns AB, Ito K, Chan EP, Douglas JF, Wu J, Yee AF, Shih YT, Huang L, Dimeo RM, Tyagi M. Why Enhanced Subnanosecond Relaxations Are Important for Toughness in Polymer Glasses. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02574] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Christopher L. Soles
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Adam B. Burns
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Kanae Ito
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Edwin P. Chan
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Jack F. Douglas
- NIST Materials Science and Engineering Division, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Jinhuang Wu
- Macromolecular Science and Engineering Program, University of Michigan, 2800 Plymouth Road, Ann Arbor, Michigan 48109, United States
| | - Albert F. Yee
- Department of Chemical and Biological Engineering, University of California, Irvine, California 92697, United States
| | - Yueh-Ting Shih
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
| | - Liping Huang
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States
| | - Robert M. Dimeo
- NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
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24
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Chen XC, Sacci RL, Osti NC, Tyagi M, Wang Y, Keum JK, Dudney NJ. Study of the Segmental Dynamics and Ion Transport of Solid Polymer Electrolytes in the Semi-crystalline State. Front Chem 2021; 8:592604. [PMID: 33520929 PMCID: PMC7838558 DOI: 10.3389/fchem.2020.592604] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/30/2020] [Indexed: 11/13/2022] Open
Abstract
Solid polymer electrolytes are promising in fulfilling the requirements for a stable lithium metal anode toward higher energy and power densities. In this work, we investigate the segmental dynamics, ionic conductivity, and crystallinity of a polymer electrolyte consisting of poly(ethylene oxide) (PEO) and lithium triflate salt, in the semi-crystalline state. Using quasi-elastic neutron scattering, the segmental dynamics of PEO chains confined between the crystalline lamellae is quantified, using Cole-Cole analysis. We show that the structural relaxation time, τ0, of PEO equilibrated near room temperature is six-fold longer than the same sample that had just cooled down to room temperature. This corresponds to a three-fold smaller ionic conductivity in the equilibrated condition. This work reveals that the segmental dynamics of semi-crystalline polymer electrolytes is very sensitive to thermal history. We demonstrate that quasi-elastic neutron scattering can be used to characterize the ion transport and segmental dynamics in the semi-crystalline state.
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Affiliation(s)
- Xi Chelsea Chen
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Robert L. Sacci
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Naresh C. Osti
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Madhusudan Tyagi
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, MD, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, United States
| | - Yangyang Wang
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Jong K. Keum
- Neutron Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
| | - Nancy J. Dudney
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States
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25
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Ganeshan K, Shin YK, Osti NC, Sun Y, Prenger K, Naguib M, Tyagi M, Mamontov E, Jiang DE, van Duin ACT. Structure and Dynamics of Aqueous Electrolytes Confined in 2D-TiO 2/Ti 3C 2T 2 MXene Heterostructures. ACS Appl Mater Interfaces 2020; 12:58378-58389. [PMID: 33337151 DOI: 10.1021/acsami.0c17536] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The synthesis of heterostructures of different two-dimensional (2D) materials offers an approach to combine advantages of different materials constituting the heterostructure and ultimately enhance their performance for applications such as electrochemical energy storage, achieving high energy, and high-power densities. Understanding the behavior of ions and solvents in confinement between these dissimilar layers is critical to understand their performance and control. Considering aqueous electrolytes, we explore the heterostructure of 2D lepidocrocite-type TiO2 (2D-TiO2) and hydroxylated or O-terminated Ti3C2 MXene using ReaxFF molecular dynamics simulations and elastic/quasielastic neutron scattering techniques. Simulating a bilayer water intercalation, we find that the extent of interlayer hydration is impacted most by the surface terminations on the MXene and is marginally affected by 2D-TiO2. However, the introduction of 2D-TiO2 decreases the water self-diffusion due to the notch sites (i.e., surface oxygen ridges) entrapping water molecules. Intercalating alkali cations into the heterostructures, we find that Li+ is predominantly adsorbed at the 2D-TiO2 surface instead of the MXenes with the preferential occupation of the notch sites. In contrast, Na+ forms a planar solvation with water, while K+ is adsorbed both at the O-terminated MXene and 2D-TiO2. This behavior is altered when OH-terminated MXene is involved-the repulsion from the protons on the MXene surface forces the K+ ions to be adsorbed exclusively to 2D-TiO2, while Na+ retains some of its solvation in the water layer due to its smaller size. In OH-terminated MXenes, we see a consistent transfer of protons from the MXene surface toward 2D-TiO2, implying a greater capacity to store protons in the heterostructures. Of the three cations simulated, Na+ hinders the proton migration the least and Li+ the most because of its position near the 2D-TiO2 surface. Therefore, 2D-TiO2/MXene heterostructures are likely to exhibit a higher energy density but lower power density, especially with Na+ intercalation.
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Affiliation(s)
- Karthik Ganeshan
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Yun Kyung Shin
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Yangyunli Sun
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Kaitlyn Prenger
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Michael Naguib
- Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science, University of Maryland, College Park, Maryland 20742, United States
| | - Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - De-En Jiang
- Department of Chemistry, University of California, Riverside, California 92521, United States
| | - Adri C T van Duin
- Department of Mechanical Engineering, The Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
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26
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Dyatkin B, Osti NC, Smith RW, Tyagi M, Butler T, Laskoski M. Chemical structure and curing dynamics of bisphenol S,
PEEK
TM
‐like, and resveratrol phthalonitrile thermoset resins. Journal of Polymer Science 2020. [DOI: 10.1002/pol.20200626] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Boris Dyatkin
- Code 6127, Chemistry Division US Naval Research Laboratory Washington District of Columbia USA
| | - Naresh C. Osti
- Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge Tennessee USA
| | - Robert W. Smith
- Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge Tennessee USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland USA
- Department of Materials Science and Engineering University of Maryland College Park Maryland USA
| | - Tristan Butler
- Code 6127, Chemistry Division US Naval Research Laboratory Washington District of Columbia USA
- Former NRC Post‐doctoral Associate U.S. Naval Research Laboratory Washington District of Columbia USA
| | - Matthew Laskoski
- Code 6127, Chemistry Division US Naval Research Laboratory Washington District of Columbia USA
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27
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Abstract
It is known that the organic units in hybrid halide perovskites are free to rotate, but it is not clear if this freedom is of any relevance to the structure-property relationship of these compounds. We have employed quasi-elastic neutron scattering using two different spectrometers, thus providing a wide dynamic range to investigate the cation dynamics in methylammonium lead bromide (MAPbBr3) and formamidinium lead bromide (FAPbBr3) over a large temperature range covering all known crystallographic phases of these two compounds. Our results establish a plastic crystal-like phase forming above 30 K within the orthorhombic phase of MAPbBr3 related to 3-fold rotations of MA units around the C-N axis with an activation energy, Ea, of ∼27 meV, which has no counterpart in the FA compound. MA exhibits an additional 4-fold orientational motion of the whole molecule via rotation of the C-N axis itself with an Ea of ∼68 meV common for the high-temperature tetragonal and cubic phases. In contrast, the FA compound exhibits only an isotropic orientational motion of the whole FA unit with Ea ≈ 106 meV within the orthorhombic phase and a substantially reduced common Ea of ∼62 meV for the high-temperature tetragonal and cubic phases. Our results suggest that the rotational dynamics of the organic units, crystallographic phases, and physical properties of these compounds are intimately connected.
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Affiliation(s)
- V K Sharma
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - R Mukhopadhyay
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - A Mohanty
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India
| | - M Tyagi
- National Institute of Standards and Technology, Center for Neutron Research, Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - J P Embs
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - D D Sarma
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560012, India
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28
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Bailey EJ, Tyagi M, Winey KI. Correlation between backbone and pyridine dynamics in poly(
2‐vinyl
pyridine)/silica polymer nanocomposites. Journal of Polymer Science 2020. [DOI: 10.1002/pol.20200416] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Eric J. Bailey
- Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania USA
| | - Madhusudan Tyagi
- Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland USA
- Department of Materials Science and Engineering University of Maryland College Park Maryland USA
| | - Karen I. Winey
- Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania USA
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29
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Foglia F, Clancy AJ, Berry-Gair J, Lisowska K, Wilding MC, Suter TM, Miller TS, Smith K, Demmel F, Appel M, Sakai VG, Sella A, Howard CA, Tyagi M, Corà F, McMillan PF. Aquaporin-like water transport in nanoporous crystalline layered carbon nitride. Sci Adv 2020; 6:eabb6011. [PMID: 32978165 PMCID: PMC7518864 DOI: 10.1126/sciadv.abb6011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 08/13/2020] [Indexed: 06/11/2023]
Abstract
Designing next-generation fuel cell and filtration devices requires the development of nanoporous materials that allow rapid and reversible uptake and directed transport of water molecules. Here, we combine neutron spectroscopy and first-principles calculations to demonstrate rapid transport of molecular H2O through nanometer-sized voids ordered within the layers of crystalline carbon nitride with a polytriazine imide structure. The transport mechanism involves a sequence of molecular orientation reversals directed by hydrogen-bonding interactions as the neutral molecules traverse the interlayer gap and pass through the intralayer voids that show similarities with the transport of water through transmembrane aquaporin channels in biological systems. The results suggest that nanoporous layered carbon nitrides can be useful for developing high-performance membranes.
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Affiliation(s)
- Fabrizia Foglia
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK
| | - Adam J Clancy
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK
| | - Jasper Berry-Gair
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK
| | - Karolina Lisowska
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK
| | - Martin C Wilding
- University of Manchester at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Theo M Suter
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
| | - Thomas S Miller
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
| | - Keenan Smith
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
| | - Franz Demmel
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton OX11 0QX, UK
| | - Markus Appel
- Institut Laue Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble CEDEX 9, France
| | - Victoria García Sakai
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton OX11 0QX, UK
| | - Andrea Sella
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK
| | - Christopher A Howard
- Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
| | - Madhusudan Tyagi
- NIST Center for Neutron Research (NCNR), National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - Furio Corà
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK
| | - Paul F McMillan
- Department of Chemistry, Christopher Ingold Laboratory, University College London, 20 Gordon St., London WC1H 0AJ, UK.
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30
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Affiliation(s)
| | - Emmanouil Glynos
- Institute of Electronic Structure and Laser, Foundation for Research and Technology—Hellas, P.O. Box 1385, 71110 Heraklion, Crete, Greece
| | - Georgios Sakellariou
- Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis
Zografou, 15771 Athens, Greece
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
- Department of Materials Science, University of Maryland, College Park, Maryland 20742, United States
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31
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Affiliation(s)
- Siqi Liu
- Department of Chemical Engineering & Materials Science, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, 100 Bureau Dr, Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Pinar Akcora
- Department of Chemical Engineering & Materials Science, Stevens Institute of Technology, Hoboken, New Jersey 07030, United States
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32
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Lima TA, Paschoal VH, Freitas RS, Faria LFO, Li Z, Tyagi M, Z Y, Ribeiro MCC. An inelastic neutron scattering, Raman, far-infrared, and molecular dynamics study of the intermolecular dynamics of two ionic liquids. Phys Chem Chem Phys 2020; 22:9074-9085. [PMID: 32297886 DOI: 10.1039/d0cp00374c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intermolecular dynamics in the THz frequency range of the ionic liquids n-butyl-trimethylammonium bis(trifluoromethanesulfonyl)imide, [N1114][NTf2], and methyl-tributylammonium bis(trifluoromethanesulfonyl)imide, [N1444][NTf2], were investigated by a combined usage of inelastic neutron scattering (INS), Raman, and far-infrared (FIR) spectroscopies and the power spectrum calculated by molecular dynamics (MD) simulations. The collective dynamics of the simulated systems is also discussed by the calculation of time correlation functions of charge and mass currents that are projected onto acoustic- and optic-like motions. The INS and Raman measurements have been performed as a function of temperature in the glassy, crystalline, and liquid phases. The excess in the vibrational density of states over the expectation of the Debye theory, the so-called boson peak, is found in the INS and Raman spectra as a peak at ∼2 meV (∼16 cm-1) and also in the direct measurement of heat capacity at very low temperatures (4-20 K). This low-frequency vibration is incorporated into the curve fits of Raman, FIR, and MD data at room temperature. Fits of spectra from these different sources in the range below 100 cm-1 are consistently achieved with three components at ca. 25, 50, and 80 cm-1, but with distinct relative intensities among the different techniques. It is proposed as the collective nature of the lowest-frequency component and the anion-cation intermolecular vibration nature of the highest-frequency component. The MD results indicate that there is no clear distinction between acoustic and optic vibrations in the spectral range investigated in this work for the ionic liquids [N1114][NTf2] and [N1444][NTf2]. The analysis carried out here agrees in part, but not entirely, with other propositions in the literature, mainly from optical Kerr effect (OKE) and FIR spectroscopies, concerning the intermolecular dynamics of ionic liquids.
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Affiliation(s)
- Thamires A Lima
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
| | - Vitor H Paschoal
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
| | - Rafael S Freitas
- Instituto de Física, Universidade de São Paulo, 05314-970 São Paulo, São Paulo, Brazil
| | - Luiz F O Faria
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
| | - Zhixia Li
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
| | - Y Z
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
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33
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Mongcopa KIS, Gribble DA, Loo WS, Tyagi M, Mullin SA, Balsara NP. Segmental Dynamics Measured by Quasi-Elastic Neutron Scattering and Ion Transport in Chemically Distinct Polymer Electrolytes. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00091] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Katrina Irene S. Mongcopa
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
| | - Daniel A. Gribble
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
| | - Whitney S. Loo
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
| | - Madhusudan Tyagi
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | | | - Nitash P. Balsara
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Joint Center for Energy Storage Research, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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Chan EP, Frieberg BR, Ito K, Tarver J, Tyagi M, Zhang W, Coughlin EB, Stafford CM, Roy A, Rosenberg S, Soles CL. Insights into the Water Transport Mechanism in Polymeric Membranes from Neutron Scattering. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02195] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Edwin P. Chan
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Bradley R. Frieberg
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Kanae Ito
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Jacob Tarver
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- National Renewable Energy Laboratory, Golden, Colorado 80401, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Wenxu Zhang
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - E. Bryan Coughlin
- Polymer Science and Engineering Department, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Christopher M. Stafford
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Abhishek Roy
- Hydrocarbons R&D, Dow Chemical Company, Freeport, Texas 77541, United States
| | - Steve Rosenberg
- DuPont Water Solutions, Edina, Minnesota 55439, United States
| | - Christopher L. Soles
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
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35
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Sharma V, Mamontov E, Tyagi M. Effects of NSAIDs on the nanoscopic dynamics of lipid membrane. Biochimica et Biophysica Acta (BBA) - Biomembranes 2020; 1862:183100. [DOI: 10.1016/j.bbamem.2019.183100] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 08/16/2019] [Accepted: 09/19/2019] [Indexed: 01/30/2023]
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Verma TR, Painuly NK, Tyagi M, Johny D, Gupta R, Bhatt MLB. Validation of the Gel & Wax Boluses and Comparison of their Dosimetric Performance with Virtual Bolus. J Biomed Phys Eng 2019; 9:629-636. [PMID: 32039093 PMCID: PMC6943845 DOI: 10.31661/jbpe.v0i0.1177] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 06/15/2019] [Indexed: 11/16/2022]
Abstract
Background In general, radiotherapy treatment planning is performed using the virtual bolus. It is necessary to investigate physical bolus in comparison to virtual one. Objectives In the present study, first, radiological properties of superflab Gel bolus and Paraffin wax bolus was investigated in terms of their relative electron density. Then, dosimetric performance of both the bolus (i.e. Gel and Parafin wax) was compared with Virtual bolus. Material and Methods In This experimental study, the radiological property of Wax and Gel boluses was investigated using two methods. In one, the relative electron density of both the Gel and Wax boluses was calculated by measuring their linear attenuation coefficient where in another method relative electron density was calculated by recording their CT No directly from their CT scan. Later CT scan of solid water slab phantom (dimension 30x30x15 cm3), with physical boluses (i.e. Gel and Wax bolus) of appropriate thicknesses required to deliver a dose of 200 cGy at Dmax using 4 MV, 6 MV and 15 MV photon beams, was taken. These CT data sets were retrieved to TPS. A plan was done to deliver a dose of 200 cGy at Dmax using Single 4 MV, 6 MV and 15 MV photon beams. Dose at depths Dmax, 1 cm, 2 cm, 3 cm, 4 cm and 5 cm was recorded. Using this similar method, doses at depths viz Dmax, 1 cm, 2 cm, 3 cm, 4 cm and 5 cm was recorded for the Gel and Wax boluses. The differences in dose of gel and wax bolus from virtual bolus were recorded for comparison of their dosimetric performance. Results The measured (calculated) relative electron density of wax and Gel bolus was found to be 0.958 (0.926) and 0.923 (0.907), respectively. Variation in dosimetric performance of Gel and Wax with reference to Virtual bolus was studied. However, on average, Gel bolus was more consistent with virtual bolus. Conclusion To avoid any dose difference between, delivered (using physical bolus) and planned (using virtual bolus), the physical boluses should be investigated for their dosimetric performance in comparison to virtual bolus. The results obtained and methodology used in this study can be applied in routine radiotherapy practices.
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Affiliation(s)
- T R Verma
- PhD, Department of Radiotherapy, King George's Medical University, UP, Lucknow, India
| | - N K Painuly
- PhD, Department of Radiotherapy, King George's Medical University, UP, Lucknow, India
| | - M Tyagi
- MSc, Department of Radiology &
| | - D Johny
- MSc, Department of Radiotherapy, King George's Medical University, UP, Lucknow, India
| | - R Gupta
- MD, Department of Radiotherapy, King George's Medical University, UP, Lucknow, India
| | - M L B Bhatt
- MD, Department of Radiotherapy, King George's Medical University, UP, Lucknow, India
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Jhalaria M, Buenning E, Huang Y, Tyagi M, Zorn R, Zamponi M, García-Sakai V, Jestin J, Benicewicz BC, Kumar SK. Accelerated Local Dynamics in Matrix-Free Polymer Grafted Nanoparticles. Phys Rev Lett 2019; 123:158003. [PMID: 31702322 DOI: 10.1103/physrevlett.123.158003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 07/26/2019] [Indexed: 06/10/2023]
Abstract
The tracer diffusion coefficient of six different permanent gases in polymer-grafted nanoparticle (GNP) membranes, i.e., neat GNP constructs with no solvent, show a maximum as a function of the grafted chain length at fixed grafting density. This trend is reproduced for two different NP sizes and three different polymer chemistries. We postulate that nonmonotonic changes in local, segmental friction as a function of graft chain length (at fixed grafting density) must underpin these effects, and use quasielastic neutron scattering to probe the self-motions of polymer chains at the relevant segmental scale (i.e., sampling local friction or viscosity). These data, when interpreted with a jump diffusion model, show that, in addition to the speeding-up in local chain dynamics, the elementary distance over which segments hop is strongly dependent on graft chain length. We therefore conclude that transport modifications in these GNP layers, which are underpinned by a structural transition from a concentrated brush to semidilute polymer brush, are a consequence of both spatial and temporal changes, both of which are likely driven by the lower polymer densities of the GNPs relative to the neat polymer.
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Affiliation(s)
- Mayank Jhalaria
- Department of Chemical Engineering, Columbia University, New York, New York 10027, USA
| | - Eileen Buenning
- Department of Chemical Engineering, Columbia University, New York, New York 10027, USA
| | - Yucheng Huang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29201, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
| | - Reiner Zorn
- Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Michaela Zamponi
- Jülich Centre for Neutron Science at MLZ, Forschungszentrum Jülich GmbH, Lichtenbergstrasse 1, 85748 Garching, Germany
| | - Victoria García-Sakai
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Jacques Jestin
- CEA Saclay, Laboratoire Léon Brillouin, F-91191 Gif Sur Yvette, France
| | - Brian C Benicewicz
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29201, USA
| | - Sanat K Kumar
- Department of Chemical Engineering, Columbia University, New York, New York 10027, USA
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Frischknecht AL, Paren BA, Middleton LR, Koski JP, Tarver JD, Tyagi M, Soles CL, Winey KI. Chain and Ion Dynamics in Precise Polyethylene Ionomers. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01712] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Amalie L. Frischknecht
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Benjamin A. Paren
- Department of Materials Science and Engineering and Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - L. Robert Middleton
- Department of Materials Science and Engineering and Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Jason P. Koski
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
| | - Jacob D. Tarver
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899-1070, United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899-1070, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Christopher L. Soles
- NIST Center for Neutron Research, Gaithersburg, Maryland 20899-1070, United States
| | - Karen I. Winey
- Department of Materials Science and Engineering and Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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39
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Zhang X, Mao Y, Tyagi M, Jiang F, Henderson D, Jiang B, Lin Z, Jones RL, Hu L, Briber RM, Wang H. Molecular partitioning in ternary solutions of cellulose. Carbohydr Polym 2019; 220:157-162. [PMID: 31196535 DOI: 10.1016/j.carbpol.2019.05.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 05/09/2019] [Accepted: 05/17/2019] [Indexed: 11/20/2022]
Abstract
Neutron scattering measurements on the structure and dynamics of ternary solutions of microcrystalline cellulose (MC) in mixtures of an ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate and a polar organic solvent dimethylformamide (DMF) have shown that MC can be fully dissolved in solvent mixtures. Data also show the molecular partitioning of IL into coexisting states. The structure partitioning is manifested as IL adsorbed to cellulose molecules with additional IL self-assembled to form clusters in solution, while the dynamics partitioning shows dynamical heterogeneities of the IL with slow dynamics resembling neat IL and fast dynamics being coupled with the solvent. The composition dependence of the molecular partitioning results in a solubility gap in dilute cellulose solutions and a phase boundary criterion of the molar ratio of IL / MC ∼ 3 in more concentrated regimes. The two characteristics together define the main features of the dissolution phase diagram of ternary cellulose mixtures of MC / IL / DMF at the room temperature.
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Affiliation(s)
- Xin Zhang
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Yimin Mao
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, United States
| | - Madhusudan Tyagi
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, United States
| | - Feng Jiang
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Doug Henderson
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Bo Jiang
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Zhiwei Lin
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Ronald L Jones
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, United States
| | - Liangbing Hu
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Robert M Briber
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States
| | - Howard Wang
- Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, United States; Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899, United States.
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40
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Mamontov E, Osti NC, Tyagi M. Temperature dependence of nanoscale dynamic processes measured in living millipedes by high resolution inelastic and elastic neutron scattering. Sci Rep 2019; 9:11646. [PMID: 31406234 PMCID: PMC6691110 DOI: 10.1038/s41598-019-48270-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 08/01/2019] [Indexed: 12/12/2022] Open
Abstract
We have used high energy-resolution neutron scattering to probe nanoscale dynamic processes in living millipedes (Narceus americanus). We have measured the temperature dependence of the intensity of scattered neutrons that do not exchange energy with the living samples on the 1.5 ns time scale, thereby excluding the signal from the highly mobile intra- and extra-cellular bulk-like aqueous constituents in the sample. This measured “elastic” scattering intensity exhibits a non-monotonic temperature dependence, with a noticeable systematic decrease detected between 295 and 303 K on warming up from 283 to 310 K. This decrease demonstrates an excellent inverse correlation with the non-monotonic, as a function of temperature, increase in the slow diffusivity previously observed in planarian flatworms and housefly larvae. This correlation suggests the existence of a biological mechanism, possibly common between different classes (Insects and Myriapods) and even phyla (Arthropods and Platyhelminthes), that dampens the slow nanoscopic dynamics in ectothermic organisms in response to the temperature of the environment exceeding the physiologically optimal range.
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Affiliation(s)
- Eugene Mamontov
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
| | - Naresh C Osti
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research and University of Maryland, Gaithersburg, Maryland, 20899, USA
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41
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Wolf CM, Kanekal KH, Yimer YY, Tyagi M, Omar-Diallo S, Pakhnyuk V, Luscombe CK, Pfaendtner J, Pozzo LD. Assessment of molecular dynamics simulations for amorphous poly(3-hexylthiophene) using neutron and X-ray scattering experiments. Soft Matter 2019; 15:5067-5083. [PMID: 31183486 DOI: 10.1039/c9sm00807a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The molecular morphology and dynamics of conjugated polymers in the bulk solid state play a significant role in determining macroscopic charge transport properties. To understand this relationship, molecular dynamics (MD) simulations and quantum mechanical calculations are used to evaluate local electronic properties. In this work, we investigate the importance of system and simulation parameters, such as force fields and equilibration methods, when simulating amorphous poly(3-hexylthiophene) (P3HT), a model semiconducting polymer. An assessment of MD simulations for five different published P3HT force fields is made by comparing results to experimental wide-angle X-ray scattering (WAXS) and to a broad range of quasi-elastic neutron scattering (QENS) data. Moreover, an in silico analysis of force field parameters reveals that atomic partial charges and torsion potentials along the backbone and side chains have the greatest impact on structure and dynamics related to charge transport mechanisms in P3HT.
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Affiliation(s)
- Caitlyn M Wolf
- Department of Chemical Engineering, University of Washington, Box 351750, Seattle, Washington 98195-1750, USA.
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Affiliation(s)
| | | | | | | | - M. Tyagi
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
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Robertson LA, Li Z, Cao Y, Shkrob IA, Tyagi M, Smith KC, Zhang L, Moore JS, Z Y. Observation of Microheterogeneity in Highly Concentrated Nonaqueous Electrolyte Solutions. J Am Chem Soc 2019; 141:8041-8046. [PMID: 31074276 DOI: 10.1021/jacs.9b02323] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The development of models to describe structure and dynamics of nonaqueous electrolyte solutions is challenging, and experimental observations are needed to form a foundation. Here, neutron scattering is used to probe molecular dynamics in nonaqueous organic electrolytes. Two solutions were compared: one contained symmetrical electrolyte molecules prone to crystallize, and one contained desymmetrized electrolyte molecules preferring disordered states. For the latter, calorimetry and neutron data show that a disordered fluid persists to very low temperatures at high concentrations. Upon heating, localized cold crystallization occurs, leading to burst nucleation of microcrystalline solids within fluid phases. Our findings indicate molecular clustering and point to solvation inhomogeneities and molecular crowding in these concentrated fluids.
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Affiliation(s)
- Lily A Robertson
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Zhixia Li
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Nuclear, Plasma, and Radiological Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Yu Cao
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Ilya A Shkrob
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Madhusudan Tyagi
- NIST Center for Neutron Research , National Institute for Standards and Technology, Gaithersburg , Maryland 20899 , United States.,Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742 , United States
| | - Kyle C Smith
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Department of Mechanical Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Department of Materials Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Lu Zhang
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Chemical Sciences and Engineering Division , Argonne National Laboratory , Argonne , Illinois 60439 , United States
| | - Jeffrey S Moore
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Department of Materials Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Y Z
- Joint Center for Energy Storage Research , Argonne National Laboratory, 9700 S. Cass Avenue , Lemont , Illinois 60439 , United States.,Department of Nuclear, Plasma, and Radiological Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Department of Materials Science and Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Department of Electrical and Computer Engineering , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
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Lima TA, Li Z, Tyagi M, Ribeiro MCC, Z Y. Spatial and thermal signatures of α and β relaxations in glassy and glacial aliphatic ionic liquids. J Chem Phys 2019; 150:144506. [PMID: 30981243 DOI: 10.1063/1.5081684] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The competition between Coulomb and van der Waals interactions brings forth unique dynamic features and broad applications to ionic liquids. Herein, we present a combined calorimetric, X-ray diffraction, incoherent elastic, and quasi-elastic neutron scattering study, over a wide temperature range (180-340 K), of the relaxational dynamics of the liquid, supercooled liquid, crystalline, glassy, and glacial states of two model ionic liquids: tributylmethylammonium (a good glass-former) and butyltrimethylammonium (a good crystal-former) cations and the bis(trifluoromethanesulfonyl)imide anion. In both systems, we observed two distinct relaxation processes. The Q-dependence of the respective relaxation time shows that the α-process is diffusive, while the β-process is modulated by the structure of the liquids.
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Affiliation(s)
- Thamires A Lima
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Zhixia Li
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil
| | - Y Z
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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45
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Tyagi M, Khan A, Husain M, Husain S. Analytical and computational studies of the nonlinear vibrations of SWCNTs embedded in viscous elastic matrix using KBM method. Chaos 2019; 29:023134. [PMID: 30823744 DOI: 10.1063/1.5079700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 02/05/2019] [Indexed: 06/09/2023]
Abstract
The forced vibration analysis of single wall carbon nanotubes (SWCNTs) embedded in the viscous elastic matrix subjected to axial parametric excitation has been investigated. The Euler Bernoulli beam model of the non-local continuum theory is used. The resonant and non-resonant solutions are analytically studied using the Krylov Bogoliubov and Mitropolsky method. It has been seen that the amplitude remains constant up to the second order of approximation. The resonant solutions are also found to analyze the possibility of chaos in the neighborhood of resonance. The computational techniques are used, and plots of time series, phase plot, and Poincaré surface of section are also drawn to confirm the chaotic behavior for certain values of parameters of SWCNTs, which may lead the aging process in the SWCNTs after a long time.
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Affiliation(s)
- M Tyagi
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia (A Central University), New Delhi 110025, India
| | - A Khan
- Department of Mathematics, Jamia Millia Islamia (A Central University), New Delhi 110025, India
| | - M Husain
- Department of Physics, Jamia Millia Islamia (A Central University), New Delhi 110025, India
| | - S Husain
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia (A Central University), New Delhi 110025, India
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Affiliation(s)
- Eric J. Bailey
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Philip J. Griffin
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Madhusudan Tyagi
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Karen I. Winey
- Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Abstract
The single particle dynamics of water confined in ordered mesoporous carbon matrix was investigated in the temperature range from 290 K to 170 K by quasielastic neutron scattering using three high resolution neutron spectrometers.
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Affiliation(s)
- Kanae Ito
- Department of Nuclear Science and Engineering
- Massachusetts Institute of Technology
- 77 Massachusetts Avenue
- Cambridge
- USA
| | - Antonio Faraone
- NIST Center for Neutron Research
- National Institute of Standards and Technology
- 100 Bureau Drive
- Gaithersburg
- USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research
- National Institute of Standards and Technology
- 100 Bureau Drive
- Gaithersburg
- USA
| | - Toshio Yamaguchi
- Department of Chemistry
- Faculty of Science
- Fukuoka University
- 8-19-1 Nanakuma
- Jonan-ku
| | - Sow-Hsin Chen
- Department of Nuclear Science and Engineering
- Massachusetts Institute of Technology
- 77 Massachusetts Avenue
- Cambridge
- USA
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Abstract
We present nanocomposite materials formed by using glassy star-shaped polymers as nanofillers and dispersing them in soft matrices. The resulting "architecturally engineered" polymer nanocomposites structurally reside between the linear homopolymer blends and the conventional polymer nanocomposites with inorganic fillers, inducing reinforcement, which can be as strong as that of solid nanoparticles, or softening depending on the compactness and concentration of the nanoparticles. Such behavior can be traced back to the dynamical features at the local segmental and the chain level, which we investigated using neutron scattering over a wide range of time and length scales in the glassy and melt states of the nanocomposites. The local and segmental dynamics as well as the degree of chain-chain entanglements are all modified by the star-shaped fillers. The presented approach to tuning the physical properties of all-polymer-based nanocomposites is readily adaptable to other polymer architectures with immediate applications in numerous areas including gas separation membranes, tissue engineering, drug delivery, and functional coatings.
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Affiliation(s)
- Erkan Senses
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg , Maryland 20899-8562 United States
- Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742-2115 , United States
- Department of Chemical and Biological Engineering , Koc University , Rumelifeneri Yolu, 34450 , Sariyer , Istanbul , Turkey
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg , Maryland 20899-8562 United States
- Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742-2115 , United States
| | - Madeleine Pasco
- Department of Biology , Rose-Hulman Institute of Technology , Terre Haute , Indiana 47803 , United States
| | - Antonio Faraone
- NIST Center for Neutron Research, National Institute of Standards and Technology , Gaithersburg , Maryland 20899-8562 United States
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49
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Wiener CG, Qiang Z, Xia Y, Tyagi M, Vogt BD. Impact of surface wettability on dynamics of supercooled water confined in nitrogen-doped ordered mesoporous carbon. Phys Chem Chem Phys 2018; 20:28019-28025. [PMID: 30383049 DOI: 10.1039/c8cp05670f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Confinement of water to nanoscale dimensions enables substantial supercooling through disruption of the hydrogen bonding network. However, there remain questions associated with the importance of the nature of the water-surface interactions relative to physical confinement defined by the pore geometry on the dynamics of supercooled water. Here, a simple route to tune the surface wetting properties through nitrogen doping of carbon is reported. This method leads to nearly indistinguishable mesopore sizes to enable separation of surface wettability and pore size effects. Quasielastic neutron scattering (QENS) is used to probe the proton dynamics of water confined within the mesopores with an average diameter of 4.85 ± 0.05 nm as a function of temperature from 267 K to 189 K. The motions of water in the mesopores follow jump-diffusion. For the temperatures examined, the diffusivity of water in the mesopores decreases with increasing nitrogen doping of the carbon framework. The activation energy associated with proton dynamics increases by approximately 30% with N-doping when compared to the undoped carbon surface, which is attributed to the enhanced surface wettability (favorable interactions between water and pore surface). This acts to provide an energy barrier for the water motions. This work suggests that the influence of surface chemistry on the dynamics of supercooled water confined in mesopores is less than the influence of nanopore size.
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Affiliation(s)
- Clinton G Wiener
- Department of Polymer Engineering, University of Akron, Akron, OH 44325, USA.
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50
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Liu Z, Yang C, Huang J, Ciampalini G, Li J, García Sakai V, Tyagi M, O'Neill H, Zhang Q, Capaccioli S, Ngai KL, Hong L. Direct Experimental Characterization of Contributions from Self-Motion of Hydrogen and from Interatomic Motion of Heavy Atoms to Protein Anharmonicity. J Phys Chem B 2018; 122:9956-9961. [PMID: 30295486 DOI: 10.1021/acs.jpcb.8b09355] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
One fundamental challenge in biophysics is to understand the connection between protein dynamics and its function. Part of the difficulty arises from the fact that proteins often present local atomic motions and collective dynamics on the same time scales, and challenge the experimental identification and quantification of different dynamic modes. Here, by taking lyophilized proteins as the example, we combined deuteration technique and neutron scattering to separate and characterize the self-motion of hydrogen and the collective interatomic motion of heavy atoms (C, O, N) in proteins on the pico-to-nanosecond time scales. We found that hydrogen atoms present an instrument-resolution-dependent onset for anharmonic motions, which can be ascribed to the thermal activation of local side-group motions. However, the protein heavy atoms exhibit an instrument-resolution-independent anharmonicity around 200 K, which results from unfreezing of the relaxation of the protein structures on the laboratory equilibrium time (100-1000 s), softening of the entire bio-macromolecules.
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Affiliation(s)
| | | | | | - Gaia Ciampalini
- Dipartimento di Fisica "E. Fermi" , Università di Pisa and Istituto per Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche , Largo Pontecorvo 3 , Pisa 56127 , Italy
| | | | - Victoria García Sakai
- ISIS Neutron and Muon Facility , Rutherford Appleton Laboratory, Science & Technology Facilities Council , Didcot OX11 0QX , United Kingdom
| | - Madhusudan Tyagi
- National Institute of Standards and Technology (NIST) , NIST Center for Neutron Research , Gaithersburg , Maryland 20899 , United States.,Department of Materials Science and Engineering , University of Maryland , College Park , Maryland 20742 , United States
| | - Hugh O'Neill
- Biology and Soft Matter Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37931 , United States
| | - Qiu Zhang
- Biology and Soft Matter Division , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37931 , United States
| | - Simone Capaccioli
- Dipartimento di Fisica "E. Fermi" , Università di Pisa and Istituto per Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche , Largo Pontecorvo 3 , Pisa 56127 , Italy
| | - K L Ngai
- Dipartimento di Fisica "E. Fermi" , Università di Pisa and Istituto per Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche , Largo Pontecorvo 3 , Pisa 56127 , Italy
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