1
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Cho J, Medina A, Saih I, Il Choi J, Drexler M, Goddard WA, Alamgir FM, Jang SS. 2D Metal/Graphene and 2D Metal/Graphene/Metal Systems for Electrocatalytic Conversion of CO 2 to Formic Acid. Angew Chem Int Ed Engl 2024; 63:e202320268. [PMID: 38271278 DOI: 10.1002/anie.202320268] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Accepted: 01/24/2024] [Indexed: 01/27/2024]
Abstract
Efficiently transforming CO2 into renewable energy sources is crucial for decarbonization efforts. Formic acid (HCOOH) holds great promise as a hydrogen storage compound due to its high hydrogen density, non-toxicity, and stability under ambient conditions. However, the electrochemical reduction of CO2 (CO2 RR) on conventional carbon black-supported metal catalysts faces challenges such as low stability through dissolution and agglomeration, as well as suffering from high overpotentials and the necessity to overcome the competitive hydrogen evolution reaction (HER). In this study, we modify the physical/chemical properties of metal surfaces by depositing metal monolayers on graphene (M/G) to create highly active and stable electrocatalysts. Strong covalent bonding between graphene and metal is induced by the hybridization of sp and d orbitals, especially the sharpd z 2 ${{d}_{{z}^{2}}}$ ,d y z ${{d}_{yz}}$ , andd x z ${{d}_{xz}}$ orbitals of metals near the Fermi level, playing a decisive role. Moreover, charge polarization on graphene in M/G enables the deposition of another thin metallic film, forming metal/graphene/metal (M/G/M) structures. Finally, evaluating overpotentials required for CO2 reduction to HCOOH, CO, and HER, we find that Pd/G, Pt/G/Ag, and Pt/G/Au exhibit excellent activity and selectivity toward HCOOH production. Our novel 2D hybrid catalyst design methodology may offer insights into enhanced electrochemical reactions through the electronic mixing of metal and other p-block elements.
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Affiliation(s)
- Jinwon Cho
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
| | - Arturo Medina
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
| | - Ines Saih
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
| | - Ji Il Choi
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
| | - Matthew Drexler
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
| | - William A Goddard
- Materials and Process Simulation Center, California Institute of Technology, Pasadena, CA 91125, USA
| | - Faisal M Alamgir
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
| | - Seung Soon Jang
- School of materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA 30332-0245, USA
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2
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Abdelhafiz A, Choi JI, Zhao B, Cho J, Ding Y, Soule L, Jang SS, Liu M, Alamgir FM. Catalysis Sans Catalyst Loss: The Origins of Prolonged Stability of Graphene-Metal-Graphene Sandwich Architecture for Oxygen Reduction Reactions. Adv Sci (Weinh) 2023; 10:e2304616. [PMID: 37863808 DOI: 10.1002/advs.202304616] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 09/01/2023] [Indexed: 10/22/2023]
Abstract
Over the past decades, the design of active catalysts has been the subject of intense research efforts. However, there has been significantly less deliberate emphasis on rationally designing a catalyst system with a prolonged stability. A major obstacle comes from the ambiguity behind how catalyst degrades. Several degradation mechanisms are proposed in literature, but with a lack of systematic studies, the causal relations between degradation and those proposed mechanisms remain ambiguous. Here, a systematic study of a catalyst system comprising of small particles and single atoms of Pt sandwiched between graphene layers, GR/Pt/GR, is studied to unravel the degradation mechanism of the studied electrocatalyst for oxygen reduction reaction(ORR). Catalyst suffers from atomic dissolution under ORR harsh acidic and oxidizing operation voltages. Single atoms trapped in point defects within the top graphene layer on their way hopping through toward the surface of GR/Pt/GR architecture. Trapping mechanism renders individual Pt atoms as single atom catalyst sites catalyzing ORR for thousands of cycles before washed away in the electrolyte. The GR/Pt/GR catalysts also compare favorably to state-of-the-art commercial Pt/C catalysts and demonstrates a rational design of a hybrid nanoarchitecture with a prolonged stability for thousands of operation cycles.
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Affiliation(s)
- Ali Abdelhafiz
- Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, 77 Mass Ave, Cambridge, MA, 02139, USA
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Bote Zhao
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Jinwon Cho
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Yong Ding
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Luke Soule
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Meilin Liu
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
| | - Faisal M Alamgir
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332, USA
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3
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Cho J, Weck M, Hwang S, Jang SS. Multiscale Modeling Approach for the Aldol Addition Reaction in Multicompartment Micelle-Based Nanoreactor. J Phys Chem B 2023; 127:10067-10076. [PMID: 37956390 PMCID: PMC10683011 DOI: 10.1021/acs.jpcb.3c05858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/21/2023] [Accepted: 10/25/2023] [Indexed: 11/15/2023]
Abstract
Water has emerged as a versatile solvent for organic chemistry in recent years due to its abundance, low cost, and environmental friendliness. However, one of the most important reactions, the aldol reaction, in the presence of excess water exhibits low yields and poor enantioselectivities. In this regard, we have employed a multiscale modeling approach to investigate the aldol addition reaction catalyzed by l-proline in the hydrophobic compartment of multicompartment micelle (MCM) nanoreactor consisting of amphiphilic bottlebrush copolymer, which minimizes the water content at the reactive site. Through performing dissipative particle dynamics (DPD) simulation, it is found that the "clover-like" morphology of the MCM is formed from multiblock copolymer with a sequence of ethylene oxide-based hydrophilic blocks, styrene lipophilic blocks, l-proline catalyst blocks, and a pentafluorostyrene fluorophilic block in aqueous media. We find that the vicinity of the catalyst in the clover-like MCM has a low dielectric environment, which could facilitate the aldol addition reaction. Our DFT calculations demonstrate that the asymmetric aldol addition of l-proline-catalyzed acetone and 4-nitrobenzaldehyde is energetically more favorable under the low dielectric environment in MCM compared with other commonly used solvents such as DMSO, water, and vacuum condition.
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Affiliation(s)
- Jinwon Cho
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Marcus Weck
- Molecular
Design Institute and Department of Chemistry, New York University, New York, New York 10003, United States
| | - Sungu Hwang
- Department
of Nanomechatronics Engineering, Pusan National
University, Miryang 50463, Korea
| | - Seung Soon Jang
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
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4
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Chen J, Moon HJ, Kim KI, Choi JI, Narayanan P, Sakwa-Novak MA, Jones CW, Jang SS. Distribution and Transport of CO 2 in Hyperbranched Poly(ethylenimine)-Loaded MCM-41: A Molecular Dynamics Simulation Approach. ACS Appl Mater Interfaces 2023; 15:43678-43690. [PMID: 37681296 PMCID: PMC10520917 DOI: 10.1021/acsami.3c07040] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 08/25/2023] [Indexed: 09/09/2023]
Abstract
Fossil fuel use is accelerating climate change, driving the need for efficient CO2 capture technologies. Solid adsorption-based direct air capture (DAC) of CO2 has emerged as a promising mode for CO2 removal from the atmosphere due to its potential for scalability. Sorbents based on porous supports incorporating oligomeric amines in their pore spaces are widely studied. In this study, we investigate the intermolecular interactions and adsorption of CO2 and H2O molecules in hyperbranched poly(ethylenimine) (HB-PEI) functionalized MCM-41 systems to understand the distribution and transport of CO2 and H2O molecules. Density Functional Theory (DFT) is employed to compute the binding energies of CO2 and H2O molecules with HB-PEI and MCM-41 and to develop force field parameters for molecular dynamics (MD) simulations. The MD simulations are performed to examine the distribution and transport of CO2 and H2O molecules as a function of the HB-PEI content. The study finds that an HB-PEI content of approximately 34 wt % is thermodynamically favorable, with an upper limit of HB-PEI loading between 45 and 50 wt %. The distribution of CO2 and H2O molecules is primarily determined by their adsorptive binding energies, for which H2O molecules dominate the occupation of binding sites due to their strong affinity with silanol groups on MCM-41 and amine groups of HB-PEI. The HB-PEI content has a considerable impact on the diffusion of CO2 and H2O molecules. Furthermore, a larger number of water molecules (higher relative humidity) reduces the correlation of CO2 with the MCM-41 pore surface while enhancing the correlation of CO2 with the amine groups of the HB-PEI. Overall, the presence of H2O molecules increases the CO2 correlation with the amine groups and also the CO2 transport within HB-PEI-loaded MCM-41, meaning that the presence of H2O enhances the CO2 capture in the HB-PEI-loaded MCM-41. These findings are consistent with experimental observations of the impact of increasing humidity on CO2 capture while providing new, molecular-level explanations for the macroscopic experimental findings.
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Affiliation(s)
- Junhe Chen
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Hyun June Moon
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Kyung Il Kim
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Ji Il Choi
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Pavithra Narayanan
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Miles A. Sakwa-Novak
- Global
Thermostat LLC, 10275
E106th Avenue, Brighton, Colorado 80601, United States
| | - Christopher W. Jones
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Seung Soon Jang
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- Strategic
Energy Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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5
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Oh JW, Lee S, Han H, Allam O, Choi JI, Lee H, Jiang W, Jang J, Kim G, Mun S, Lee K, Kim Y, Park JW, Lee S, Jang SS, Park C. Dual-light emitting 3D encryption with printable fluorescent-phosphorescent metal-organic frameworks. Light Sci Appl 2023; 12:226. [PMID: 37696793 PMCID: PMC10495391 DOI: 10.1038/s41377-023-01274-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 08/07/2023] [Accepted: 08/24/2023] [Indexed: 09/13/2023]
Abstract
Optical encryption technologies based on room-temperature light-emitting materials are of considerable interest. Herein, we present three-dimensional (3D) printable dual-light-emitting materials for high-performance optical pattern encryption. These are based on fluorescent perovskite nanocrystals (NCs) embedded in metal-organic frameworks (MOFs) designed for phosphorescent host-guest interactions. Notably, perovskite-containing MOFs emit a highly efficient blue phosphorescence, and perovskite NCs embedded in the MOFs emit characteristic green or red fluorescence under ultraviolet (UV) irradiation. Such dual-light-emitting MOFs with independent fluorescence and phosphorescence emissions are employed in pochoir pattern encryption, wherein actual information with transient phosphorescence is efficiently concealed behind fake information with fluorescence under UV exposure. Moreover, a 3D cubic skeleton is developed with the dual-light-emitting MOF powder dispersed in 3D-printable polymer filaments for 3D dual-pattern encryption. This article outlines a universal principle for developing MOF-based room-temperature multi-light-emitting materials and a strategy for multidimensional information encryption with enhanced capacity and security.
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Affiliation(s)
- Jin Woo Oh
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seokyeong Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Hyowon Han
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Omar Allam
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, GA, 30332-0405, USA
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332-0245, USA
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332-0245, USA
| | - Hyeokjung Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Wei Jiang
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Jihye Jang
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Gwanho Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seungsoo Mun
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Kyuho Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yeonji Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Jong Woong Park
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seonju Lee
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, GA, 30332-0245, USA.
| | - Cheolmin Park
- Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
- Spin Convergence Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea.
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6
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Ahmed E, Cho J, Jang SS, Weck M. Nonorthogonal Cascade Catalysis in Multicompartment Micelles. Chemistry 2023; 29:e202301231. [PMID: 37183699 DOI: 10.1002/chem.202301231] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/11/2023] [Accepted: 05/11/2023] [Indexed: 05/16/2023]
Abstract
Multicompartment micelles (MCMs) containing acid and base sites in discrete domains are prepared from poly(norbornene)-based amphiphilic bottlebrush copolymers in aqueous media. The acid and base sites are localized in different compartments of the micelle, enabling the nonorthogonal reaction sequence: deacetalization - Knoevenagel condensation - Michael addition of acetals to 2-amino chromene derivatives. Computational simulations using dissipative particle dynamics (DPD) elucidated the bottlebrush composition required to effectively site-isolate the nonorthogonal catalysts. This contribution presents MCMs as a new class of nanostructures for one-pot multistep nonorthogonal cascade catalysis, laying the groundwork for the isolation of three or more incompatible catalysts to synthesize value-added compounds in a single reaction vessel, in water.
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Affiliation(s)
- Eman Ahmed
- Molecular Design Institute, Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Jinwon Cho
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA, 30332-0245, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, GA, 30332-0245, USA
| | - Marcus Weck
- Molecular Design Institute, Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
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7
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Chen J, Warner MJ, Sikora B, Kiddle D, Coverdell D, Allam O, Kohl PA, Jang SS. The selective heating effect of microwave irradiation on a binary mixture of water and polyethylene oxide: a molecular dynamics simulation approach. Phys Chem Chem Phys 2023; 25:12522-12531. [PMID: 37133822 DOI: 10.1039/d3cp00349c] [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: 05/04/2023]
Abstract
In this study, we investigate the molecular mechanisms of a microwave-driven selective heating process by performing molecular dynamics simulations for three different systems including pure water, pure polyethylene oxide (PEO), and water-PEO mixed systems in the presence of a microwave with two different intensities of electric field such as 0.001 V Å-1 and 0.01 V Å-1 at a frequency of 100 GHz. First, from performing molecular dynamics simulations of CO and CO2 in the presence of the microwave, it is confirmed that the molecular dipole moment is responsible for the rotational motion induced by the oscillating electric field. Second, by analyzing the MD simulations of the pure water system, we discover that the dipole moment of water exhibits a time lag with respect to the microwave. During the heating process, however, the temperature, kinetic, and potential energies increase synchronously with the oscillating electric field of the microwave, showing that the heating of the water system is caused by the molecular reaction of water to the microwave. Comparing the water-PEO mixed system to the pure water and pure PEO systems, the water-PEO mixed system has a higher heating rate than the pure PEO system but a lower heating rate than the pure water system. Therefore, we conclude that heating the water-PEO mixed system is driven by water molecules selectively activated by microwave irradiation. We also calculate the diffusion coefficients of water molecules and PEO chains by describing their mean square displacements, demonstrating that the diffusion coefficients are increased in the presence of microwaves for both water and PEO in pure and mixed systems. Lastly, during the microwave heating process, the structures of the water-PEO mixed system are altered as a function of the intensity of electric field, which is mainly driven by the response of water molecules.
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Affiliation(s)
- Junhe Chen
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, 30332-0245, USA.
| | - Matthew J Warner
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0100, USA
| | - Benjamin Sikora
- Department of Energy's Kansas City National Security Campus managed by Honeywell, 14520 Botts Road, Kansas City, MO 64147, USA
| | - Daniel Kiddle
- Department of Energy's Kansas City National Security Campus managed by Honeywell, 14520 Botts Road, Kansas City, MO 64147, USA
| | - Danielle Coverdell
- Department of Energy's Kansas City National Security Campus managed by Honeywell, 14520 Botts Road, Kansas City, MO 64147, USA
| | - Omar Allam
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, 30332-0245, USA.
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive NW, Atlanta, Georgia 30332-0405, USA
| | - Paul A Kohl
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, GA 30332-0100, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, 30332-0245, USA.
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8
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Salim MG, Vasudevan V, Schulman N, Zamani S, Kersey KD, Joshi Y, AlAmer M, Choi JI, Jang SS, Joo YL. Thermoresponsive Conductivity of Graphene-Based Fibers. Small 2023; 19:e2204981. [PMID: 36828800 DOI: 10.1002/smll.202204981] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 02/07/2023] [Indexed: 05/18/2023]
Abstract
Smart materials are versatile material systems which exhibit a measurable response to external stimuli. Recently, smart material systems have been developed which incorporate graphene in order to share on its various advantageous properties, such as mechanical strength, electrical conductivity, and thermal conductivity as well as to achieve unique stimuli-dependent responses. Here, a graphene fiber-based smart material that exhibits reversible electrical conductivity switching at a relatively low temperature (60 °C), is reported. Using molecular dynamics (MD) simulation and density functional theory-based non-equilibrium Green's function (DFT-NEGF) approach, it is revealed that this thermo-response behavior is due to the change in configuration of amphiphilic triblock dispersant molecules occurring in the graphene fiber during heating or cooling. These conformational changes alter the total number of graphene-graphene contacts within the composite material system, and thus the electrical conductivity as well. Additionally, this graphene fiber fabrication approach uses a scalable, facile, water-based method, that makes it easy to modify material composition ratios. In all, this work represents an important step forward to enable complete functional tuning of graphene-based smart materials at the nanoscale while increasing commercialization viability.
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Affiliation(s)
- Muhammad G Salim
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Vaibhav Vasudevan
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
| | - Nicholas Schulman
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Somayeh Zamani
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Kyle D Kersey
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Yash Joshi
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Mohammed AlAmer
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
| | - Yong Lak Joo
- Robert Fredrick Smith School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY, 14853, USA
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9
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Woo HM, Allam O, Chen J, Jang SS, Yoon BJ. Optimal high-throughput virtual screening pipeline for efficient selection of redox-active organic materials. iScience 2022; 26:105735. [PMID: 36582827 PMCID: PMC9793274 DOI: 10.1016/j.isci.2022.105735] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 11/16/2022] [Accepted: 12/01/2022] [Indexed: 12/12/2022] Open
Abstract
As global interest in renewable energy continues to increase, there has been a pressing need for developing novel energy storage devices based on organic electrode materials that can overcome the shortcomings of the current lithium-ion batteries. One critical challenge for this quest is to find materials whose redox potential (RP) meets specific design targets. In this study, we propose a computational framework for addressing this challenge through the effective design and optimal operation of a high-throughput virtual screening (HTVS) pipeline that enables rapid screening of organic materials that satisfy the desired criteria. Starting from a high-fidelity model for estimating the RP of a given material, we show how a set of surrogate models with different accuracy and complexity may be designed to construct a highly accurate and efficient HTVS pipeline. We demonstrate that the proposed HTVS pipeline construction and operation strategies substantially enhance the overall screening throughput.
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Affiliation(s)
- Hyun-Myung Woo
- Computational Science Initiative, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Omar Allam
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA,George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Junhe Chen
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA,Corresponding author
| | - Byung-Jun Yoon
- Computational Science Initiative, Brookhaven National Laboratory, Upton, NY 11973, USA,Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843, USA,Corresponding author
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10
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Choi E, Choi JI, Kim Y, Kim YJ, Eum K, Choi Y, Kwon O, Kim M, Choi W, Ji H, Jang SS, Kim DW. Graphene Nanoribbon Hybridization of Zeolitic Imidazolate Framework Membranes for Intrinsic Molecular Separation. Angew Chem Int Ed Engl 2022; 61:e202214269. [DOI: 10.1002/anie.202214269] [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] [Received: 09/27/2022] [Indexed: 11/05/2022]
Affiliation(s)
- Eunji Choi
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Ji Il Choi
- School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive NW Atlanta USA
| | - Yong‐Jae Kim
- Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daehak-ro 291, Yuseong-gu Daejeon 34141 (Republic of Korea
| | - Yeong Jae Kim
- Department of Chemical Engineering Soongsil University Sangdo-ro 369, Dongjak-gu Seoul 06978 (Republic of Korea
| | - Kiwon Eum
- Department of Chemical Engineering Soongsil University Sangdo-ro 369, Dongjak-gu Seoul 06978 (Republic of Korea
| | - Yunkyu Choi
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Ohchan Kwon
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Minsu Kim
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Wooyoung Choi
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Hyungjoon Ji
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive NW Atlanta USA
| | - Dae Woo Kim
- Department of Chemical and Biomolecular Engineering Yonsei University Yonsei-ro 50, Seodaemun-gu Seoul 03722 (Republic of Korea
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11
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Ahmed E, Cho J, Friedmann L, Jang SS, Weck M. Catalytically Active Multicompartment Micelles. JACS Au 2022; 2:2316-2326. [PMID: 36311828 PMCID: PMC9597600 DOI: 10.1021/jacsau.2c00367] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 08/25/2022] [Accepted: 08/26/2022] [Indexed: 06/16/2023]
Abstract
This article presents the self-assembly behavior of multicompartment micelles (MCMs) in water into morphologies with multiple segregated domains and their use as supports for aqueous catalysis. A library of poly(norbornene)-based amphiphilic bottlebrush copolymers containing covalently attached l-proline in the hydrophobic, styrene, and pentafluorostyrene domains and a poly(ethylene glycol)-containing repeat unit as the hydrophilic block have been synthesized using ring-opening metathesis polymerization. Interaction parameter (χ) values between amphiphilic blocks were determined using a Flory-Huggins-based computational model. The morphologies of the MCMs are observed via cryogenic transmission electron microscopy and modeled using dissipative particle dynamic simulations. The catalytic activities of these MCM nanoreactors were systematically investigated using the aldol addition between 4-nitrobenzaldehyde and cyclohexanone in water as a model reaction. MCMs present an ideal environment for catalysis by providing control over water content and enhancing interactions between the catalytic sites and the aldehyde substrate, thereby forming the aldol product in high yields and selectivities that is otherwise not possible under aqueous conditions. Catalyst location, block ratio, and functionality have substantial influences on micelle morphology and, ultimately, catalytic efficiency. "Clover-like" and "core-shell" micelle morphologies displayed the best catalytic activity. Our MCM-based catalytic system expands the application of these nanostructures beyond selective storage of guest molecules and demonstrates the importance of micelle morphology on catalytic activity.
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Affiliation(s)
- Eman Ahmed
- Molecular
Design Institute and Department of Chemistry, New York University, New York, New York 10003, United States
| | - Jinwon Cho
- School
of Materials Science and Engineering, Georgia
Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Lulu Friedmann
- Molecular
Design Institute and Department of Chemistry, New York University, New York, New York 10003, United States
| | - Seung Soon Jang
- School
of Materials Science and Engineering, Georgia
Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Marcus Weck
- Molecular
Design Institute and Department of Chemistry, New York University, New York, New York 10003, United States
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12
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Choi E, Choi JI, Kim YJ, Kim YJ, Eum K, Choi Y, Kwon O, Kim M, Choi W, Ji H, Jang SS, Kim DW. Graphene Nanoribbon Hybridization of Zeolitic Imidazolate Framework Membranes for Intrinsic Molecular Separation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202214269] [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: 11/11/2022]
Affiliation(s)
- Eunji Choi
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Ji Il Choi
- Georgia Institute of Technology School of Materials Science and Engineering KOREA, REPUBLIC OF
| | - Yong-Jae Kim
- Korea Advanced Institute of Science and Technology Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Yeong Jae Kim
- Soongsil University Chemical engineering KOREA, REPUBLIC OF
| | - Kiwon Eum
- Soongsil University Chemical engineering KOREA, REPUBLIC OF
| | - Yunkyu Choi
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Ohchan Kwon
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Minsu Kim
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Wooyoung Choi
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Hyungjoon Ji
- Yonsei University Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Seung Soon Jang
- Georgia Institute of Technology Chemical and biomolecular engineering KOREA, REPUBLIC OF
| | - Dae Woo Kim
- Yonsei University GS-Caltex building #309, Department of Chemical and Biomolecular Engineering 03722 Seoul KOREA, REPUBLIC OF
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13
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Jin S, Allam O, Lee K, Lim J, Lee MJ, Loh SH, Jang SS, Lee SW. Carbon Quantum Dot Modified Reduced Graphene Oxide Framework for Improved Alkali Metal Ion Storage Performance. Small 2022; 18:e2202898. [PMID: 35927029 DOI: 10.1002/smll.202202898] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/03/2022] [Indexed: 06/15/2023]
Abstract
Organic materials with redox-active oxygen functional groups are of great interest as electrode materials for alkali-ion storage due to their earth-abundant constituents, structural tunability, and enhanced energy storage properties. Herein, a hybrid carbon framework consisting of reduced graphene oxide and oxygen functionalized carbon quantum dots (CQDs) is developed via the one-pot solvothermal reduction method, and a systematic study is undertaken to investigate its redox mechanism and electrochemical properties with Li-, Na-, and K-ions. Due to the incorporation of CQDs, the hybrid cathode delivers consistent improvements in charge storage performance for the alkali-ions and impressive reversible capacity (257 mAh g-1 at 50 mA g-1 ), rate capability (111 mAh g-1 at 1 A g-1 ), and cycling stability (79% retention after 10 000 cycles) with Li-ion. Furthermore, density functional theory calculations uncover the CQD structure-electrochemical reactivity trends for different alkali-ion. The results provide important insights into adopting CQD species for optimal alkali-ion storage.
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Affiliation(s)
- Shikai Jin
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Omar Allam
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Kyungbin Lee
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Jeonghoon Lim
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Michael J Lee
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Sze Hou Loh
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Seung Woo Lee
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
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14
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Cho J, Choi JI, Jang SS. Structural Transformation of a Multicompartment Micelle Induced by Photo-Switchable Spiropyran–Merocyanine Transition: Dissipative Particle Dynamics Simulation Approach. J Phys Chem B 2022. [DOI: 10.1021/acs.jpcb.2c02269] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jinwon Cho
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
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15
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Cleveland JW, Choi JI, Sekiya RS, Cho J, Moon HJ, Jang SS, Jones CW. Cooperativity in the Aldol Condensation Using Bifunctional Mesoporous Silica-Poly(styrene) MCM-41 Organic/Inorganic Hybrid Catalysts. ACS Appl Mater Interfaces 2022; 14:11235-11247. [PMID: 35229600 DOI: 10.1021/acsami.1c21738] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This work explores the efficacy of silica/organic hybrid catalysts, where the organic component is built from linear aminopolymers appended to the silica support within the support mesopores. Specifically, the role of molecular weight and polymer chain composition in amine-bearing atom transfer radical polymerization-synthesized poly(styrene-co-2-(4-vinylbenzyl)isoindoline-1,3-dione) copolymers is probed in the aldol condensation of 4-nitrobenzaldehyde and acetone. Controlled polymerization produces protected amine-containing poly(styrene) chains of controlled molecular weight and dispersity, and a grafting-to thiol-ene coupling approach followed by a phthalimide deprotection step are used to covalently tether and activate the polymer hybrid catalysts prior to the catalytic reactions. Site-normalized batch kinetics are used to assess the role of polymer molecular weight and chain composition in the cooperative catalysis. Lower-molecular-weight copolymers are demonstrated to be more active than catalysts built from only molecular organic components or from higher-molecular-weight chains. Molecular dynamics simulations are used to probe the role of polymer flexibility and morphology, whereby it is determined that higher-molecular-weight hybrid structures result in congested pores that inhibit active site cooperativity and the diffusivity of reagents, thus resulting in lower rates during the reaction.
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Affiliation(s)
- Jacob W Cleveland
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, Georgia 30332-0100, United States
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Ryoh-Suke Sekiya
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, Georgia 30332-0100, United States
| | - Jinwon Cho
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Hyun June Moon
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, Georgia 30332-0100, United States
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Christopher W Jones
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Dr., Atlanta, Georgia 30332-0100, United States
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16
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Abstract
Type II porous liquids, comprising intrinsically porous molecules dissolved in a liquid solvent, potentially combine the adsorption properties of porous adsorbents with the handling advantages of liquids. Previously, discovery of appropriate solvents to make porous liquids had been limited to direct experimental tests. We demonstrate an efficient screening approach for this task that uses COSMO-RS calculations, predictions of solvent pKa values from a machine-learning model, and several other features and apply this approach to select solvents from a library of more than 11,000 compounds. This method is shown to give qualitative agreement with experimental observations for two molecular cages, CC13 and TG-TFB-CHEDA, identifying solvents with higher solubility for these molecules than had previously been known. Ultimately, the algorithm streamlines the downselection of suitable solvents for porous organic cages to enable more rapid discovery of Type II porous liquids.
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Affiliation(s)
- Chao-Wen Chang
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Isaiah Borne
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Robin M Lawler
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Zhenzi Yu
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ryan P Lively
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - David S Sholl
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.,Oak Ridge National Laboratory, Oak Ridge, Tennessee 37839, United States
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17
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Abstract
In this study, we propose a novel method of pKa prediction in a diverse set of acids, which combines density functional theory (DFT) method with machine learning (ML) methods. First, the DFT method with B3LYP/6-31++G**/SM8 is used to predict pKa, yielding a mean absolute error of 1.85 pKa units. Subsequently, such pKa values predicted from the DFT method are employed as one of 10 molecular descriptors for developing ML models trained on experimental data. Kernel Ridge Regression (KRR), Gaussian Process Regression, and Artificial Neural Network are optimized using three Pipelines: Pipeline 1 involving only hyperparameter optimization (HPO), Pipeline 2 involving HPO followed by a relative contribution analysis (RCA) and recursive feature elimination (RFE), and Pipeline 3 involving HPO followed by RCA and RFE on an expanded set of composite features. Finally, it is demonstrated that KRR with Pipeline 3 yields optimal pKa prediction at an MAE of 0.60 log units. This algorithm was then utilized to predict the pKa of 37 novel acids. The two most important features were determined to be the number of hydrogen atoms in the molecule and the degree of oxidation of the acid. The predicted pKa values were documented for future reference.
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Affiliation(s)
- Robin Lawler
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States.,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Yao-Hao Liu
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Nessa Majaya
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Omar Allam
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States.,G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Hyunchul Ju
- Department of Mechanical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212, Republic of Korea
| | - Jin Young Kim
- Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
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18
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Go CY, Jang SS, Kim KC. Tailored Design of Electrochemically Degradable Anthraquinone Functionality toward Organic Cathodes. ACS Appl Mater Interfaces 2021; 13:35729-35738. [PMID: 34288644 DOI: 10.1021/acsami.1c08167] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
In efforts to design organic cathode materials for rechargeable batteries, a fundamental understanding of the redox properties of diverse non-carbon-based functionalities incorporated into 9,10-anthraquinone is lacking despite their potential impact. Herein, a preliminary investigation of the potential of anthraquinones with halogenated nitrogen-based functionalities reveals that the Li-triggered structural collapse observed in the early stage of discharging can be ascribed to the preference toward the strong Lewis acid-base interaction of N-Li-X (X = F or Cl) over the repulsive interaction of the electron-rich N-X bond. A further study of three solutions (i.e., substitution of NX2 with (i) BX2, (ii) NH2, and (iii) BH2) to the structural decomposition issue highlights four conclusive remarks. First, the replacement of N and/or X with electron-deficient atom(s), such as B and/or H, relieves the repulsive force on the N-X bond without the assistance of Li, and thus, no structural decomposition occurs. Second, the incorporation of BH2 is verified to be the most beneficial for improving the theoretical performance. Third, all the redox properties are better correlated with electron affinity and solvation energy than the electronegativity of functionality, implying that these key parameters cooperatively contribute to the electrochemical redox potential; additionally, solvation energy plays a crucial role in determining cathodic deactivation. Fourth, the improvement to the Li storage capability of anthraquinone using the third solution can primarily be ascribed to solvation energy remaining at a negative value even after the binding of more Li atoms than the other derivatives.
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Affiliation(s)
- Chae Young Go
- Computational Materials Design Laboratory, Division of Chemical Engineering, Konkuk University, Seoul 05029, The Republic of Korea
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ki Chul Kim
- Computational Materials Design Laboratory, Division of Chemical Engineering, Konkuk University, Seoul 05029, The Republic of Korea
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19
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Jo S, Yoon KR, Lim Y, Kwon T, Kang YS, Sohn H, Choi SH, Son HJ, Kwon SH, Lee SG, Jang SS, Lee SY, Kim HJ, Kim JY. Single-Step Fabrication of Polymeric Composite Membrane via Centrifugal Colloidal Casting for Fuel Cell Applications. Small Methods 2021; 5:e2100285. [PMID: 34927860 DOI: 10.1002/smtd.202100285] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/26/2021] [Indexed: 06/14/2023]
Abstract
Recent interest in polymer electrolyte membranes (PEMs) for fuel cell systems has spurred the development of infiltration technology by which to insert ionomers into mechanically robust reinforcement structures by solution casting in order to produce a cost effective and highly efficient electrolyte. However, the results of the fabrication process often continue to present challenges related to the structural complexity and self-assembly dynamics between the hydrophobic and hydrophilic parts of the constituents which in turn, necessitates additional processing steps and increases production costs. Here, a single-step process is reported for highly compact polymeric composite membranes (PCMs), fabricated using a centrifugal colloidal casting (C3) method. Combined structural analyses as well as coarse-grained molecular dynamics simulations are employed to determine the micro-/macroscopic structural characteristics of the fabricated PCMs. These findings indicate that the C3 method is capable of forming highly dense ionomer matrix-reinforcement composites consisting of microphase-separated ionomer structures with tailored crystallinity and ionic cluster sizes. An outcome that is very unlikely with the single-step coating steps in conventional methods. These structural attributes ensure PCMs with better proton conductivity, greater strain stability, and lower gas crossover properties compared to commercial pristine membranes, expanding their possible range of applicability to PEMs.
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Affiliation(s)
- Sunhee Jo
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
- Division of Energy & Environment Technology, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
| | - Ki Ro Yoon
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
- Advanced Textile R&D Department, Korea Institute of Industrial Technology (KITECH), 143, Hanggaulro, Sangnok-gu, Ansan-si, Gyeonggi-do, 15588, Republic of Korea
| | - Youngjoon Lim
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Taehyun Kwon
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Yun Sik Kang
- Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), Daejeon, 3429, Republic of Korea
| | - Hyuntae Sohn
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Sun Hee Choi
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Hae Jung Son
- Advanced Photovoltaics Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Sung Hyun Kwon
- School of Chemical Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea
| | - Seung Geol Lee
- School of Chemical Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea
- Department of Organic Material Science and Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - So Young Lee
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Hyoung-Juhn Kim
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Jin Young Kim
- Center for Hydrogen and Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
- Division of Energy & Environment Technology, University of Science and Technology (UST), Daejeon, 34113, Republic of Korea
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20
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Kim K, Lawler R, Moon HJ, Narayanan P, Sakwa-Novak MA, Jones CW, Jang SS. Distribution and Transport of CO 2 in Hydrated Hyperbranched Poly(ethylenimine) Membranes: A Molecular Dynamics Simulation Approach. ACS Omega 2021; 6:3390-3398. [PMID: 33553957 PMCID: PMC7860517 DOI: 10.1021/acsomega.0c05923] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 01/11/2021] [Indexed: 05/20/2023]
Abstract
Hyperbranched poly(ethylenimine) (HB-PEI) has been distinguished as a promising candidate for carbon dioxide (CO2) capture. In this study, we investigate the distribution and transport of CO2 molecules in a HB-PEI membrane at various hydration levels using molecular dynamics (MD) simulations. For this, model structures consisting of amorphous HB-PEI membranes with CO2 molecules are equilibrated at various hydration levels. Under dry conditions, the primary and secondary amines are highly associated with CO2, indicating that they would participate in CO2 capture via the carbamate formation mechanism. Under hydrated conditions, the pair correlations of CO2 with the primary and secondary amines are reduced. This result suggests that the carbamate formation mechanism is less prevalent compared to dry conditions, which is also supported by CO2 residence time analysis. However, in the presence of water molecules, it is found that the CO2 molecules can be associated with both amine groups and water molecules, which would enable the tertiary amine as well as the primary and secondary amines to capture CO2 molecules via the bicarbonate formation mechanism. Through our MD simulation results, the feasibilities of different CO2 capture pathways in HB-PEI membranes are demonstrated at the molecular level.
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Affiliation(s)
- Kyung
Il Kim
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Robin Lawler
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Hyun June Moon
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Pavithra Narayanan
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Miles A. Sakwa-Novak
- Global
Thermostat LLC, 10275
E. 106th Ave, Brighton, Colorado 80601, United States
| | - Christopher W. Jones
- School
of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, United States
| | - Seung Soon Jang
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- Strategic
Energy Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Institute
for Electronics and Nanotechnology, Georgia
Institute of Technology, Atlanta, Georgia 30332, United States
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21
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Nah Y, Allam O, Kim HS, Choi JI, Kim IS, Byun J, Kim SO, Jang SS, Kim DH. Spectral Instability of Layered Mixed Halide Perovskites Results from Anion Phase Redistribution and Selective Hole Injection. ACS Nano 2021; 15:1486-1496. [PMID: 33382600 DOI: 10.1021/acsnano.0c08897] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Despite the ability to precisely tune their bandgap energies, mixed halide perovskites (MHPs) suffer from significant spectral instability, which obstructs their utilization for the rational design of light-emitting diodes. Here, we investigate the origin of the electroluminescence peak shifts in layered MHPs containing bromide and iodide. X-ray diffraction and steady-state absorption measurements prove effective integration of iodide into the cubic lattice and the spatially uniform distribution of halides in the ambient environment. However, the applied electric field during the device operation is found to drive the systematic halide migration. Quantum mechanical density functional theory calculations reveal that the different activation energies required for directional ion hopping lead to the redistribution of anions. In-depth analyses of the electroluminescence spectra indicate that the spectral shifting rate is dependent on the drift velocity of halides. Finally, it is suggested from our study that the dominant red emission is ascribed to the thermodynamically favorable selective hole injection. Our mechanistic study provides insights into the fundamental reason for the spectral instability of devices based on MHPs.
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Affiliation(s)
- Yoonseo Nah
- Division of Chemical Engineering and Materials Science, College of Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Omar Allam
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 801 Ferst Drive, Atlanta, Georgia 30332-0405, United States
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Han Seul Kim
- Center for Supercomputing Applications, National Institute of Supercomputing and Networking, Korea Institute of Science and Technology Information, Daejeon 34141, Republic of Korea
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - In Soo Kim
- Nanophotonics Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Jinwoo Byun
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, United States
| | - Dong Ha Kim
- Division of Chemical Engineering and Materials Science, College of Engineering, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
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22
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Ahmed E, Womble CT, Cho J, Dancel-Manning K, Rice WJ, Jang SS, Weck M. One-pot synthesis of linear triblock terpolymers and their aqueous self-assembly. Polym Chem 2021. [DOI: 10.1039/d1py00054c] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Compartmentalized micelles are prepared through the self-assembly of linear triblock terpolymers containing hydrophilic (H), lipophilic (L), and fluorophilic (F) domains.
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Affiliation(s)
- Eman Ahmed
- Molecular Design Institute
- Department of Chemistry
- New York University
- New York
- USA
| | - C. Tyler Womble
- Molecular Design Institute
- Department of Chemistry
- New York University
- New York
- USA
| | - Jinwon Cho
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | | | - William J. Rice
- Cryo-Electron Microscopy Laboratory
- New York University Langone Medical Center
- New York
- USA
| | - Seung Soon Jang
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Marcus Weck
- Molecular Design Institute
- Department of Chemistry
- New York University
- New York
- USA
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23
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Cleveland JW, Kumar DR, Cho J, Jang SS, Jones CW. Creation of discrete active site domains via mesoporous silica poly(styrene) composite materials for incompatible acid–base cascade reactions. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01988g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Mesoporous silica/polymer hybrid materials catalyze a two-step acid and base cascade reaction. Catalyst design emphasizes compartmentalization of incompatible Lewis base and Brønsted acid catalysts by tuning polymer chain length and silica pore diameter.meter.
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Affiliation(s)
- Jacob W. Cleveland
- School of Chemical & Biomolecular Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Dharam Raj Kumar
- School of Chemical & Biomolecular Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Jinwon Cho
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Seung Soon Jang
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Christopher W. Jones
- School of Chemical & Biomolecular Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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24
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Lawler R, Caliendo C, Ju H, Kim JY, Lee SW, Jang SS. Effect of the Side-Chain Length in Perfluorinated Sulfonic and Phosphoric Acid-Based Membranes on Nanophase Segregation and Transport: A Molecular Dynamics Simulation Approach. J Phys Chem B 2020; 124:1571-1580. [PMID: 32026694 DOI: 10.1021/acs.jpcb.9b10408] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of side-chain length on the nanophase-segregated structure and transport in perfluorinated sulfonic acid (PFSA)-based and perfluorinated phosphoric acid (PFPA)-based membranes is investigated at 20 and 5 wt % water content conditions using a molecular dynamics simulation method. It is found using the pair correlation analysis that the longer side chain leads to more developed local water structures in the water phase at 20 wt % water content, observable in both membrane chemistries albeit more distinct in PFPA-based membranes. It is also confirmed from the structure factor analysis that large-scale nanophase segregation is enhanced with increasing side-chain length for PFPA membranes, whereas no significant change is observed at these scales for PFSA membranes. Next, it is revealed that the proton transport is increased by 0.004 S/cm in PFSA-based membranes with increasing side-chain length due to the enhanced vehicular and hopping mechanisms, whereas the proton transport in PFPA-based membranes is decreased by 0.002 S/cm despite improved nanophase segregation. As confirmed by the pair correlation function analysis, the diminished proton transport in PFPA-based membranes is attributed to the molecular association of phosphate groups with hydronium ions via hydrogen bond in the longer side-chain case, which is namely a hydronium-mediated bridge configuration. Such bridge configurations and correspondingly similar trends in proton transport are also observed at 5 wt % water content condition to a lesser extent. Our simulation study demonstrates that the proton transport is affected by the hydrogen-bonding network as well as by the nanophase segregation.
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Affiliation(s)
- Robin Lawler
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332 , United States.,School of Chemical and Biomolecular Engineering , Georgia Institute of Technology , 311 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Charles Caliendo
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332 , United States
| | - Hyunchul Ju
- Department of Mechanical Engineering , Inha University , 100 Inha-ro , Michuhol-gu, Incheon 22212 , Republic of Korea
| | - Jin Young Kim
- Center for Hydrogen Fuel Cell Research , Korea Institute of Science and Technology (KIST) , Seoul 02792 , Republic of Korea
| | - Seung Woo Lee
- G. W. Woodruff School of Mechanical Engineering , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.,Strategic Energy Institute , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332 , United States.,Strategic Energy Institute , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States.,Institute for Electronics and Nanotechnology , Georgia Institute of Technology , Atlanta , Georgia 30332 , United States
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25
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Choi JI, Kim HS, Shin YS, Johnson C, Fomina N, Staley P, Lang C, Jang SS. Electron-Transport Characteristics through Aluminum Oxide (100) and (012) in a Metal-Insulator-Metal Junction System: Density Functional Theory-Nonequilibrium Green Function Approach. ACS Omega 2020; 5:1717-1724. [PMID: 32010846 PMCID: PMC6990641 DOI: 10.1021/acsomega.9b04011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 01/08/2020] [Indexed: 05/29/2023]
Abstract
Al2O3 is commonly used in modern electronic devices because of its good mechanical properties and excellent electrical insulating property. Although fundamental understanding of the electron transport in Al2O3 is essential for its use in electronic device applications, a thorough investigation for the electron-transport mechanism has not been conducted on the structures of Al2O3, especially in nanometer-scale electronic device settings. In this work, electron transport via Al2O3 for two crystallographic facets, (100) and (012), in a metal-insulator-metal junction configuration is investigated using a density functional theory-based nonequilibrium Green function method. First, it is confirmed that the transmission function, T(E), decreases as a function of energy in (E - E F) < 0 regime, which is an intuitively expected trend. On the other hand, in the (E - E F) > 0 regime, Al2O3(100) and Al2O3(012) show their own characteristic behaviors of T(E), presenting that major peaks are shifted toward lower energy levels under a finite bias voltage. Second, the overall conductance decay rates under zero bias are similar regardless of the crystallographic orientation, so that the contact interface seemingly has only a minor contribution to the overall conductance. A noteworthy feature at the finite bias condition is that the electrical current drastically increases as a function of bias potential (>0.7 V) in Al2O3(012)-based junction compared with the Al2O3(100) counterpart. It is elucidated that such a difference is due to the well-developed eigenchannels for electron transport in the Al2O3(012)-based junction. Therefore, it is evidently demonstrated that at finite bias condition, the contact interface plays a key role in determining insulating properties of Al2O3-Pt junctions.
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Affiliation(s)
- Ji Il Choi
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Han Seul Kim
- National
Institute of Supercomputing and Networking, Korea Institute of Science and Technology Information, Daejeon 34141, Republic of Korea
| | - Young Shik Shin
- Research
& Technology Center, Robert Bosch LLC, 384 Santa Trinita Avenue, Sunnyvale, California 94085, United States
| | - Christopher Johnson
- Research
& Technology Center, Robert Bosch LLC, 384 Santa Trinita Avenue, Sunnyvale, California 94085, United States
| | - Nadezda Fomina
- Research
& Technology Center, Robert Bosch LLC, 384 Santa Trinita Avenue, Sunnyvale, California 94085, United States
| | - Patrick Staley
- Research
& Technology Center, Robert Bosch LLC, 384 Santa Trinita Avenue, Sunnyvale, California 94085, United States
- School
of Mathematics, Science & Engineering, Southwestern College, 900 Otay Lakes Rd, Chula Vista, California 91910-7297, United States
| | - Christoph Lang
- Research
& Technology Center, Robert Bosch LLC, 384 Santa Trinita Avenue, Sunnyvale, California 94085, United States
| | - Seung Soon Jang
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- Institute
for Electronics and Nanotechnology, Georgia
Institute of Technology, Atlanta, Georgia 30332, United States
- Strategic
Energy Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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26
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Tsai PH, Jang SS, Liou LB. Septicaemia is associated with increased disease activity and mortality in systemic lupus erythematosus: a retrospective analysis from Taiwan. Lupus 2020; 29:191-198. [PMID: 31959041 DOI: 10.1177/0961203319899162] [Citation(s) in RCA: 3] [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] [Indexed: 12/16/2022]
Abstract
OBJECTIVE This study aimed to investigate how septicaemia, non-septicaemia infection and the disease itself are associated with disease activity and mortality in inpatients with systemic lupus erythematosus (SLE) in Taiwan. METHODS We retrospectively reviewed 1115 patients and enrolled 427 with SLE admitted for lupus flare-ups and co-morbidities. Disease activity and infection type/site were recorded and categorized according to the causes of admission and mortality into three categories, of which two were specified as follows: (a) septicaemia admissions, non-septicaemia admissions; and (b) septicaemia mortality, non-septicaemia infection mortality and non-infection mortality. The relationships between lupus flare-ups and mortality in different groups were analysed using an unpaired t-test, Mann-Whitney U-test and logistic regression. RESULTS Septicaemia was the major cause of mortality in SLE inpatients. There were 98 (22.95%) mortality patients among all 427 SLE patients. The septicaemia admissions had higher disease activity (SLE Disease Activity Index 2000 = 13.00 ± 7.98) than the non-septicaemia admissions (9.77 ± 5.72; p < 0.01). The mean current SLEDAI score of the septicaemia mortality group (14.91 ± 8.01) was higher than that of the non-septicaemia infection mortality group (10.05 ± 5.75; p = 0.02), in spite of the similar mean earlier SLEDAI score. The risk of mortality in the septicaemia mortality group due to previous septicaemia admissions was 13.2 times (odds ratio) higher than in the non-septicaemia infection mortality group and 15.6 times higher than in the non-infection mortality group. CONCLUSION Septicaemia relates to increased lupus disease activity and is associated with a greater risk of mortality in the SLE patients than other causes of admission. Fewer previous septicaemia admissions decrease the risk of septicaemia mortality.
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Affiliation(s)
- P H Tsai
- Division of Rheumatology, Allergy, and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
| | - S S Jang
- Division of Rheumatology, Allergy, and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan
| | - L B Liou
- Division of Rheumatology, Allergy, and Immunology, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan.,Chang Gung Memorial Hospital at Keelung, Keelung, Taiwan.,Chang Gung University College of Medicine, Taoyuan, Taiwan
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27
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Callaway CP, Lee SM, Mallard M, Clark B, Jang SS. Effect of Block Length and Side Chain Length Ratios on Determining a Multicompartment Micelle Structure. J Phys Chem B 2019; 123:4784-4791. [PMID: 31082229 DOI: 10.1021/acs.jpcb.9b02231] [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: 01/21/2023]
Abstract
Previous work has identified the importance of the lipophilic-fluorophilic block length ratio Rl in predicting the morphology of linear lipophilic-hydrophilic-fluorophilic (hereafter referred to as BAC) micelle systems. Here, a generalized form R of this structural parameter is developed that makes no assumption of BAC triblock co-polymer linearity, while still providing accurate predictions of the micelle morphology. The morphologies of BAC micelles formed by triblock co-polymers with R≪1 or R≫1 have similar features, with the only notable difference being an inversion of the lipophilic and fluorophilic regions. A destabilization of the single-core micelle structure occurs as R approaches unity from either direction. Finally, the extent to which the micelle morphology depends on the polymer architecture instead of the composition alone is examined, with a decreased patchiness observed in BAC systems with very long block lengths. Through the modification of both the R -value and the polymer architecture, the micelle morphology can be effectively tuned for use in immobilized catalysis and nanoreactor applications.
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Affiliation(s)
- Connor P Callaway
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332-0245 , United States
| | - Seung Min Lee
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332-0245 , United States
| | - Mackenzie Mallard
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332-0245 , United States
| | - Benjamin Clark
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332-0245 , United States
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering , Georgia Institute of Technology , 771 Ferst Drive NW , Atlanta , Georgia 30332-0245 , United States
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28
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Oh JH, Kwon BW, Cho J, Lee CH, Kim MK, Choi SH, Yoon SP, Han J, Nam SW, Kim JY, Jang SS, Lee KB, Ham HC. Importance of Exsolution in Transition-Metal (Co, Rh, and Ir)-Doped LaCrO3 Perovskite Catalysts for Boosting Dry Reforming of CH4 Using CO2 for Hydrogen Production. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b05337] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [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)
- Joo Hyeng Oh
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Byeong Wan Kwon
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Jinwon Cho
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Chan Hyun Lee
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Min Kyeong Kim
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Sun Hee Choi
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
| | - Sung Pil Yoon
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
| | - Jonghee Han
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Suk Woo Nam
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Jin Young Kim
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States
| | - Ki Bong Lee
- Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyung Chul Ham
- Fuel Cell Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Energy & Environment Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
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29
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Callaway CP, Bond N, Hendrickson K, Lee SM, Jang SS. Structural Tunability of Multicompartment Micelles as a Function of Lipophilic–Fluorophilic Block Length Ratio. J Phys Chem B 2018; 122:12164-12172. [DOI: 10.1021/acs.jpcb.8b07769] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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)
- Connor P. Callaway
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Nicholas Bond
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Kayla Hendrickson
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Seung Min Lee
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, Georgia, United States
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia, United States
- Strategic Energy Institute, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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30
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Lee SM, Bond N, Callaway C, Clark B, Farmer E, Mallard M, Jang SS. Dissipative particle dynamics simulation of multicompartment micelle nanoreactor with channel for reactants. RSC Adv 2018; 8:37866-37871. [PMID: 35558591 PMCID: PMC9089328 DOI: 10.1039/c8ra07023g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 08/22/2018] [Accepted: 11/06/2018] [Indexed: 11/21/2022] Open
Abstract
The structural variation of multicompartment micelles is investigated using a dissipative particle dynamics simulation method for nano-reactor application. It turns out that well-defined multicompartment micelles with channel structures can be generated through the self-assembly of triblock copolymers consisting of a hydrophilic (A), a lipophilic (B), and a fluorophobic (C) block arranged in a B–A–C sequence: The corona and core are formed by the hydrophilic A block and the fluorophilic C block, respectively while the channel between the aqueous phase and core is formed by the lipophilic B block and the core. By performing a set of simulations, it is confirmed that channel size can be controlled as a function of the block length ratios between blocks A and B. Furthermore, it is also confirmed that the reactants pass through such channels to reach the micelle core by analyzing the pair correlation functions. By monitoring the change of the number of reactants in the multicompartment micelle, it is revealed that the diffusion of reactants into the core is slowed down as the concentration gradient is decreased. This work provides mesoscopic insight for the formation of multicompartment micelles and transport of reactants for use in the design of micelles as nanoreactors. The structural variation of multicompartment micelles is investigated using a dissipative particle dynamics simulation method for nano-reactor application.![]()
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Affiliation(s)
- Seung Min Lee
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA
| | - Nicholas Bond
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA
| | - Connor Callaway
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA
| | - Benjamin Clark
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA
| | - Emily Farmer
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA
| | - MacKensie Mallard
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology 771 Ferst Drive NW Atlanta GA 30332-0245 USA .,Institute for Electronics and Nanotechnology, Georgia Institute of Technology Atlanta GA USA.,Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology Atlanta GA USA.,Strategic Energy Institute, Georgia Institute of Technology Atlanta GA 30332 USA
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31
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Allam O, Holmes C, Greenberg Z, Kim KC, Jang SS. Density Functional Theory - Machine Learning Approach to Analyze the Bandgap of Elemental Halide Perovskites and Ruddlesden-Popper Phases. Chemphyschem 2018; 19:2559-2565. [PMID: 29928788 DOI: 10.1002/cphc.201800382] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Omar Allam
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332-0245 USA
- The George W. Woodruff School of Mechanical Engineering; Georgia Institute of Technology; Atlanta GA 30332-0405 USA
| | - Colin Holmes
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332-0245 USA
| | - Zev Greenberg
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332-0245 USA
| | - Ki Chul Kim
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332-0245 USA
- Department of Chemical Engineering; Konkuk University; Seoul 05029 Republic of Korea
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering; Georgia Institute of Technology; Atlanta GA 30332-0245 USA
- Institute for Electronics and Nanotechnology; Georgia Institute of Technology; Atlanta GA 30332 USA
- Parker H. Petit Institute for Bioengineering and Bioscience; Georgia Institute of Technology; Atlanta GA 30332 USA
- Strategic Energy Institute; Georgia Institute of Technology; Atlanta, GA 30332 USA
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32
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Callaway CP, Hendrickson K, Bond N, Lee SM, Sood P, Jang SS. Molecular Modeling Approach to Determine the Flory-Huggins Interaction Parameter for Polymer Miscibility Analysis. Chemphyschem 2018; 19:1655-1664. [PMID: 29575473 DOI: 10.1002/cphc.201701337] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [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: 12/14/2017] [Indexed: 11/09/2022]
Abstract
In this work, we present a thorough procedure for estimating the Flory-Huggins χ-parameter for use in atomistic and mesoscale molecular simulations in computational materials science. In particular, we propose improvements upon traditional Flory-Huggins theory by implementing a Connolly volume normalization (CVN). We apply this technique to several test systems, including a blend of poly (epichlorohydrin) and poly (methyl acrylate), a blend of polyethylene glycol and poly (methyl methacrylate), a blend of polystyrene and deuterated polystyrene, and three molecular-weight variants (monomer, dimer, and trimer) of a triblock copolymer for use in multicompartment micelle applications. Our results demonstrate that the newly developed procedure offers high accuracy and efficiency in predicting the Flory-Huggins χ-parameter for miscibility analysis compared to traditional experimental and computational methods. There are still several factors that cause the magnitude of the χ-parameter to vary between simulations performed on molecular species with the same identity but different degrees of polymerization; although we discuss possible explanations for these factors, this is nonetheless a primary focus for further exploration into this new methodology.
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Affiliation(s)
- Connor P Callaway
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA, 30332-0245, USA
| | - Kayla Hendrickson
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA, 30332-0245, USA
| | - Nicholas Bond
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA, 30332-0245, USA
| | - Seung Min Lee
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA, 30332-0245, USA
| | - Parveen Sood
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA, 30332-0245, USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, GA, 30332-0245, USA.,Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA, USA.,Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
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33
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Sood P, Kim KC, Jang SS. Electrochemical Properties of Boron-Doped Fullerene Derivatives for Lithium-Ion Battery Applications. Chemphyschem 2018; 19:753-758. [PMID: 29216411 DOI: 10.1002/cphc.201701171] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [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: 10/27/2017] [Revised: 12/06/2017] [Indexed: 12/29/2022]
Abstract
The high electron affinity of fullerene C60 coupled with the rich chemistry of carbon makes it a promising material for cathode applications in lithium-ion batteries. Since boron has one electron less than carbon, the presence of boron on C60 cages is expected to generate electron deficiency in C60 , and thereby to enhance its electron affinity. By using density functional theory (DFT), we studied the redox potentials and electronic properties of C60 and C59 B. We have found that doping C60 with one boron atom results in a substantial increase in redox potential from 2.462 V to 3.709 V, which was attributed to the formation of an open shell system. We also investigated the redox and electronic properties of C59 B functionalized with various redox-active oxygen containing functional groups (OCFGs). For the combination of functionalization with OCFGs and boron doping, it is found that the enhancement of redox potential is reduced, which is mainly attributed to the open shell structure being changed to a closed-shell one. Nevertheless, the redox potentials are still higher than that of pristine C60 . From the observation that the lowest unoccupied molecular orbital of closed-shell OCFG- functionalized C59 B is correlated well with the redox potential, it was confirmed that the spin state is crucial to be considered to understand the relationship between electronic structure and redox properties.
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Affiliation(s)
- Parveen Sood
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
| | - Ki Chul Kim
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA.,Department of Chemical Engineering, Konkuk University, Seoul, 05029, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA.,Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA, USA.,Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
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Allam O, Cho BW, Kim KC, Jang SS. Application of DFT-based machine learning for developing molecular electrode materials in Li-ion batteries. RSC Adv 2018; 8:39414-39420. [PMID: 35558035 PMCID: PMC9090775 DOI: 10.1039/c8ra07112h] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [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: 08/26/2018] [Accepted: 11/20/2018] [Indexed: 01/01/2023] Open
Abstract
In this study, we utilize a density functional theory-machine learning framework to develop a high-throughput screening method for designing new molecular electrode materials.
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Affiliation(s)
- Omar Allam
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Byung Woo Cho
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Ki Chul Kim
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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Kim KC, Jang SS. Effects of thermal shrinkage temperatures and comonomers on thermal shrinkage of uniaxially-stretched PET copolymer films: a molecular dynamics simulation approach. NEW J CHEM 2018. [DOI: 10.1039/c7nj05087a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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
Thermal shrinkage ratios for PET copolymer models are correlated with the conformational change of polymer chains at molecular levels.
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Affiliation(s)
- Ki Chul Kim
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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Kwon S, Kwon HJ, Choi JI, Kim KC, Seo JG, Park JE, You SJ, Park ED, Jang SS, Lee HC. Enhanced Selectivity for CO 2 Adsorption on Mesoporous Silica with Alkali Metal Halide Due to Electrostatic Field: A Molecular Simulation Approach. ACS Appl Mater Interfaces 2017; 9:31683-31690. [PMID: 28829116 DOI: 10.1021/acsami.7b04508] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Since adsorption performances are dominantly determined by adsorbate-adsorbent interactions, accurate theoretical prediction of the thermodynamic characteristics of gas adsorption is critical for designing new sorbent materials as well as understanding the adsorption mechanisms. Here, through our molecular modeling approach using a newly developed quantum-mechanics-based force field, it is demonstrated that the CO2 adsorption selectivity of SBA-15 can be enhanced by incorporating crystalline potassium chloride particles. It is noted that the induced intensive electrostatic fields around potassium chloride clusters create gas-trapping sites with high selectivity for CO2 adsorption. The newly developed force field can provide a reliable theoretical tool for accurately evaluating the gas adsorption on given adsorbents, which can be utilized to identify good gas adsorbents.
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Affiliation(s)
- Soonchul Kwon
- Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd. , 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
- Department of Civil and Environmental Engineering, Pusan National University , 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Hyuk Jae Kwon
- Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd. , 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
| | - Ji Il Choi
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332-0245, United States
| | - Ki Chul Kim
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332-0245, United States
| | - Jeong Gil Seo
- Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd. , 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
- Department of Environmental Engineering and Energy, Myongji University , 116 Myongji-ro, Cheoin-gu, Yongin-si, Gyeonggi-do 449-728, Republic of Korea
| | - Jung Eun Park
- Department of Energy Systems Research and Department of Chemical Engineering, Ajou University , 206, Worldcup-ro, Yeongtong-gu, Suwon 443-749, Republic of Korea
| | - Su Jin You
- Department of Energy Systems Research and Department of Chemical Engineering, Ajou University , 206, Worldcup-ro, Yeongtong-gu, Suwon 443-749, Republic of Korea
| | - Eun Duck Park
- Department of Energy Systems Research and Department of Chemical Engineering, Ajou University , 206, Worldcup-ro, Yeongtong-gu, Suwon 443-749, Republic of Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332-0245, United States
| | - Hyun Chul Lee
- Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd. , 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-803, Republic of Korea
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Park JH, Liu T, Kim KC, Lee SW, Jang SS. Systematic Molecular Design of Ketone Derivatives of Aromatic Molecules for Lithium-Ion Batteries: First-Principles DFT Modeling. ChemSusChem 2017; 10:1584-1591. [PMID: 28199064 DOI: 10.1002/cssc.201601730] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 02/02/2017] [Indexed: 06/06/2023]
Abstract
The thermodynamic and electrochemical redox properties for a set of ketone derivatives of phenalenyl and anthracene have been investigated to assess their potential application for positive electrode materials in rechargeable lithium-ion batteries. Using first-principles DFT, it was found that 1) the thermodynamic stabilities of ketone derivatives are strongly dependent on the distribution of the carbonyl groups and 2) the redox potential is increased when increasing the number of the incorporated carbonyl groups. The highest values are 3.93 V versus Li/Li+ for the phenalenyl derivatives and 3.82 V versus Li/Li+ for the anthracene derivatives. It is further highlighted that the redox potential of an organic molecule is also strongly correlated with its spin state in the thermodynamically stable form.
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Affiliation(s)
- Jong Hoo Park
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA
| | - Tianyuan Liu
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA
| | - Ki Chul Kim
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
| | - Seung Woo Lee
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0405, USA
- Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA, USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245, USA
- Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA, USA
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA
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Niu LN, Jee SE, Jiao K, Tonggu L, Li M, Wang L, Yang YD, Bian JH, Breschi L, Jang SS, Chen JH, Pashley DH, Tay FR. Collagen intrafibrillar mineralization as a result of the balance between osmotic equilibrium and electroneutrality. Nat Mater 2017; 16:370-378. [PMID: 27820813 PMCID: PMC5321866 DOI: 10.1038/nmat4789] [Citation(s) in RCA: 155] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 09/28/2016] [Indexed: 05/20/2023]
Abstract
Mineralization of fibrillar collagen with biomimetic process-directing agents has enabled scientists to gain insight into the potential mechanisms involved in intrafibrillar mineralization. Here, by using polycation- and polyanion-directed intrafibrillar mineralization, we challenge the popular paradigm that electrostatic attraction is solely responsible for polyelectrolyte-directed intrafibrillar mineralization. As there is no difference when a polycationic or a polyanionic electrolyte is used to direct collagen mineralization, we argue that additional types of long-range non-electrostatic interaction are responsible for intrafibrillar mineralization. Molecular dynamics simulations of collagen structures in the presence of extrafibrillar polyelectrolytes show that the outward movement of ions and intrafibrillar water through the collagen surface occurs irrespective of the charges of polyelectrolytes, resulting in the experimentally verifiable contraction of the collagen structures. The need to balance electroneutrality and osmotic equilibrium simultaneously to establish Gibbs-Donnan equilibrium in a polyelectrolyte-directed mineralization system establishes a new model for collagen intrafibrillar mineralization that supplements existing collagen mineralization mechanisms.
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Affiliation(s)
- Li-na Niu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Sang Eun Jee
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Kai Jiao
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - Lige Tonggu
- Department of Biological Structure, University of Washington, Seattle, Washington, USA
| | - Mo Li
- Department of Biological Structure, University of Washington, Seattle, Washington, USA
| | - Liguo Wang
- Department of Biological Structure, University of Washington, Seattle, Washington, USA
| | - Yao-dong Yang
- Frontier Institute of Science and Technology, State Key Laboratory for Mechanical behavior of Materials, Xi’an Jiaotong University, Xi’an, China
| | - Ji-hong Bian
- Frontier Institute of Science and Technology, State Key Laboratory for Mechanical behavior of Materials, Xi’an Jiaotong University, Xi’an, China
| | - Lorenzo Breschi
- Department of Biomedical and Neuromotor Sciences, DIBINEM, University of Bologna, Bologna, Italy
| | - Seung Soon Jang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Ji-hua Chen
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an, China
| | - David H. Pashley
- The Dental College of Georgia, Augusta University, Augusta, Georgia, USA
| | - Franklin R. Tay
- The Dental College of Georgia, Augusta University, Augusta, Georgia, USA
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Chun BJ, Lu J, Weck M, Jang SS. Characterization of molecular association of poly(2-oxazoline)s-based micelles with various epoxides and diols via the Flory-Huggins theory: a molecular dynamics simulation approach. Phys Chem Chem Phys 2016; 17:29161-70. [PMID: 26463559 DOI: 10.1039/c5cp03854e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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 hydrolytic kinetic resolution (HKR) of epoxides has been performed in a shell-crosslinked micellar (SCM) nanoreactor consisting of amphiphilic triblock copolymers based on poly(2-oxazline)s polymer derivatives with attached Co(iii)-salens to the micelle core. To investigate the effect of the molecular interaction of reactant/product molecules with the SCM nanoreactor on the rate of HKR, we calculated the Flory-Huggins interaction parameters (χ) using the molecular dynamics simulation method. For this, the blend systems were constructed with various compositions such as 15, 45, and 70 wt% of the reactant/product molecules with respect to the polymers such as poly(2-methyl-2-oxazoline) (PMOX), poly(2-(3-butinyl)2-oxazoline) (PBOX), and poly(methyl-3-oxazol-2-yl)pentanoate with Co(iii)-salen (PSCoX). From the χ parameters, we demonstrate that the miscibility of reactants/products with polymers has a strong correlation with the experimental reaction rate of the HKR: phenyl glycidyl ether (Reac-OPh) > epoxyhexane (Reac-C4) > styrene oxide (Reac-Ph) > epichlorohydrin (Reac-Cl). To validate this finding, we also conducted the potential of mean force analysis using steered molecular dynamics simulation for the molecular displacement of Reac-Cl and Reac-OPh through PMOX and PSCoX, revealing that the free energy reduction was greater when Reac-OPh molecule enters the polymer phase compared to Reac-Cl, which agrees with the findings from the χ parameters calculations.
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Affiliation(s)
- Byeong Jae Chun
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100, USA and Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, USA.
| | - Jie Lu
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, USA
| | - Marcus Weck
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, USA. and Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA, USA
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Kim KC, Moschetta EG, Jones CW, Jang SS. Molecular Dynamics Simulations of Aldol Condensation Catalyzed by Alkylamine-Functionalized Crystalline Silica Surfaces. J Am Chem Soc 2016; 138:7664-72. [DOI: 10.1021/jacs.6b03309] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [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)
- Ki Chul Kim
- Computational NanoBio
Technology Laboratory, School of Materials
Science and Engineering, ‡School of Chemical & Biomolecular Engineering, §Institute for Electronics
and Nanotechnology, and ∥Parker H. Petit Institute for Bioengineering and
Bioscience, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Eric G. Moschetta
- Computational NanoBio
Technology Laboratory, School of Materials
Science and Engineering, ‡School of Chemical & Biomolecular Engineering, §Institute for Electronics
and Nanotechnology, and ∥Parker H. Petit Institute for Bioengineering and
Bioscience, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Christopher W. Jones
- Computational NanoBio
Technology Laboratory, School of Materials
Science and Engineering, ‡School of Chemical & Biomolecular Engineering, §Institute for Electronics
and Nanotechnology, and ∥Parker H. Petit Institute for Bioengineering and
Bioscience, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Seung Soon Jang
- Computational NanoBio
Technology Laboratory, School of Materials
Science and Engineering, ‡School of Chemical & Biomolecular Engineering, §Institute for Electronics
and Nanotechnology, and ∥Parker H. Petit Institute for Bioengineering and
Bioscience, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
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Jee SE, Zhou J, Tan J, Breschi L, Tay FR, Grégoire G, Pashley DH, Jang SS. Investigation of ethanol infiltration into demineralized dentin collagen fibrils using molecular dynamics simulations. Acta Biomater 2016; 36:175-85. [PMID: 26969524 DOI: 10.1016/j.actbio.2016.03.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/18/2016] [Accepted: 03/07/2016] [Indexed: 10/22/2022]
Abstract
The purpose of this study is to investigate the interaction of neat ethanol with bound and non-bound water in completely demineralized dentin that is fully hydrated, using molecular dynamics (MD) simulation method. The key to creating ideal resin-dentin bonds is the removal of residual free water layers and its replacement by ethanol solvent in which resin monomers are soluble, using the ethanol wet-bonding technique. The test null hypotheses were that ethanol cannot remove any collagen-bound water, and that ethanol cannot infiltrate into the spacing between collagen triple helix due to narrow interlayer spacing. Collagen fibrillar structures of overlap and gap regions were constructed by aligning the collagen triple helix of infinite length in hexagonal packing. Three layers of the water molecules were specified as the layers of 0.15-0.22nm, 0.22-0.43nm and 0.43-0.63nm from collagen atoms by investigating the water distribution surrounding collagen molecules. Our simulation results show that ethanol molecules infiltrated into the intermolecular spacing in the gap region, which increased due to the lateral shrinkage of the collagen structures in contact with ethanol solution, while there was no ethanol infiltration observed in the overlap region. Infiltrated ethanol molecules in the gap region removed residual water molecules via modifying mostly the third water layer (50% decrease), which would be considered as a loosely-bound water layer. The first and second hydration layers, which would be considered as tightly bound water layers, were not removed by the ethanol molecules, thus maintaining the helical structures of the collagen molecules.
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Kim KC, Liu T, Lee SW, Jang SS. First-Principles Density Functional Theory Modeling of Li Binding: Thermodynamics and Redox Properties of Quinone Derivatives for Lithium-Ion Batteries. J Am Chem Soc 2016; 138:2374-82. [DOI: 10.1021/jacs.5b13279] [Citation(s) in RCA: 147] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ki Chul Kim
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
| | - Tianyuan Liu
- G.
W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
| | - Seung Woo Lee
- G.
W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
- Institute
for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Seung Soon Jang
- Computational
NanoBio Technology Laboratory, School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0245, United States
- Institute
for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Parker
H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0363, United States
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Kim S, Russell M, Kulkarni DD, Henry M, Kim S, Naik RR, Voevodin AA, Jang SS, Tsukruk VV, Fedorov AG. Activating "Invisible" Glue: Using Electron Beam for Enhancement of Interfacial Properties of Graphene-Metal Contact. ACS Nano 2016; 10:1042-1049. [PMID: 26741645 DOI: 10.1021/acsnano.5b06342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 06/05/2023]
Abstract
Interfacial contact of two-dimensional graphene with three-dimensional metal electrodes is crucial to engineering high-performance graphene-based nanodevices with superior performance. Here, we report on the development of a rapid "nanowelding" method for enhancing properties of interface to graphene buried under metal electrodes using a focused electron beam induced deposition (FEBID). High energy electron irradiation activates two-dimensional graphene structure by generation of structural defects at the interface to metal contacts with subsequent strong bonding via FEBID of an atomically thin graphitic interlayer formed by low energy secondary electron-assisted dissociation of entrapped hydrocarbon contaminants. Comprehensive investigation is conducted to demonstrate formation of the FEBID graphitic interlayer and its impact on contact properties of graphene devices achieved via strong electromechanical coupling at graphene-metal interfaces. Reduction of the device electrical resistance by ∼50% at a Dirac point and by ∼30% at the gate voltage far from the Dirac point is obtained with concurrent improvement in thermomechanical reliability of the contact interface. Importantly, the process is rapid and has an excellent insertion potential into a conventional fabrication workflow of graphene-based nanodevices through single-step postprocessing modification of interfacial properties at the buried heterogeneous contact.
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Affiliation(s)
| | | | | | | | - Steve Kim
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson AFB, Ohio 45433-7707, United States
| | - Rajesh R Naik
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson AFB, Ohio 45433-7707, United States
| | - Andrey A Voevodin
- Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson AFB, Ohio 45433-7707, United States
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Kim S, Kim KC, Lee SW, Jang SS. Thermodynamic and redox properties of graphene oxides for lithium-ion battery applications: a first principles density functional theory modeling approach. Phys Chem Chem Phys 2016; 18:20600-6. [DOI: 10.1039/c6cp02692c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [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
Understanding the thermodynamic stability and redox properties of oxygen functional groups on graphene is critical to systematically design stable graphene-based positive electrode materials with high potential for lithium-ion battery applications.
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Affiliation(s)
- Sunghee Kim
- George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- Atlanta
- USA
- Computational NanoBio Technology Laboratory
| | - Ki Chul Kim
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Seung Woo Lee
- George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- Atlanta
- USA
- Institute for Electronics and Nanotechnology
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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45
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Brunello GF, Lee JH, Lee SG, Choi JI, Harvey D, Jang SS. Interactions of Pt nanoparticles with molecular components in polymer electrolyte membrane fuel cells: multi-scale modeling approach. RSC Adv 2016. [DOI: 10.1039/c6ra09274h] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Three phase model consists of Pt nanoparticles, Nafion, and graphite with oxygen, water, and hydronium.
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Affiliation(s)
- Giuseppe F. Brunello
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Ji Hye Lee
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Seung Geol Lee
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Ji Il Choi
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | | | - Seung Soon Jang
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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Moon HS, Yun JM, Kim KH, Jang SS, Lee SG. Investigations of the band structures of edge-defect zigzag graphene nanoribbons using density functional theory. RSC Adv 2016. [DOI: 10.1039/c6ra03458f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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] Open
Abstract
Band structures of edge-oxidized (left) and edge-nitrided (right) zigzag graphene nanoribbons.
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Affiliation(s)
- Hye Sook Moon
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan
- Republic of Korea
| | - Je Moon Yun
- Global Frontier R&D Center for Hybrid Interface Materials
- Pusan National University
- Busan
- Republic of Korea
| | - Kwang Ho Kim
- Global Frontier R&D Center for Hybrid Interface Materials
- Pusan National University
- Busan
- Republic of Korea
- School of Materials Science and Engineering
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Seung Geol Lee
- Department of Organic Material Science and Engineering
- Pusan National University
- Busan
- Republic of Korea
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Chun BJ, Fisher CC, Jang SS. Dissipative particle dynamics simulation study of poly(2-oxazoline)-based multicompartment micelle nanoreactor. Phys Chem Chem Phys 2016; 18:6284-90. [DOI: 10.1039/c5cp07100c] [Citation(s) in RCA: 8] [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: 11/21/2022]
Abstract
We investigate multicompartment micelles for nanoreactor applications, using the DPD simulation method to characterize the internal structure and the distribution of the reactant.
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Affiliation(s)
- Byeong Jae Chun
- School of Chemical & Biomolecular Engineering
- Georgia Institute of Technology
- Atlanta
- USA
- Computational NanoBio Technology Laboratory
| | - Christina Clare Fisher
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Seung Soon Jang
- Computational NanoBio Technology Laboratory
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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Chang Y, Mohanty AD, Smedley SB, Abu-Hakmeh K, Lee YH, Morgan JE, Hickner MA, Jang SS, Ryu CY, Bae C. Effect of Superacidic Side Chain Structures on High Conductivity Aromatic Polymer Fuel Cell Membranes. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01739] [Citation(s) in RCA: 48] [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: 11/28/2022]
Affiliation(s)
- Ying Chang
- Department
of Chemistry and Chemical Biology, New York State Center for Polymer
Synthesis, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
- Department
of Chemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Box 454003, Las Vegas, Nevada 89154-4003, United States
| | - Angela D. Mohanty
- Department
of Chemistry and Chemical Biology, New York State Center for Polymer
Synthesis, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
| | - Sarah B. Smedley
- Department
of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Khaldoon Abu-Hakmeh
- School
of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Young Hun Lee
- School
of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Joel E. Morgan
- Center
for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Michael A. Hickner
- Department
of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Seung Soon Jang
- School
of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Dr., Atlanta, Georgia 30332-0245, United States
| | - Chang Y. Ryu
- Department
of Chemistry and Chemical Biology, New York State Center for Polymer
Synthesis, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
| | - Chulsung Bae
- Department
of Chemistry and Chemical Biology, New York State Center for Polymer
Synthesis, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, New York 12180, United States
- Department
of Chemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Box 454003, Las Vegas, Nevada 89154-4003, United States
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49
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Kim S, Russell M, Henry M, Kim SS, Naik RR, Voevodin AA, Jang SS, Tsukruk VV, Fedorov AG. Dynamic modulation of electronic properties of graphene by localized carbon doping using focused electron beam induced deposition. Nanoscale 2015; 7:14946-14952. [PMID: 26302897 DOI: 10.1039/c5nr04063a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report on the first demonstration of controllable carbon doping of graphene to engineer local electronic properties of a graphene conduction channel using focused electron beam induced deposition (FEBID). Electrical measurements indicate that an "n-p-n" junction on graphene conduction channel is formed by partial carbon deposition near the source and drain metal contacts by low energy (<50 eV) secondary electrons due to inelastic collisions of long range backscattered primary electrons generated from a low dose of high energy (25 keV) electron beam (1 × 10(18) e(-) per cm(2)). Detailed AFM imaging provides direct evidence of the new mechanism responsible for dynamic evolution of the locally varying graphene doping. The FEBID carbon atoms, which are physisorbed and weakly bound to graphene, diffuse towards the middle of graphene conduction channel due to their surface chemical potential gradient, resulting in negative shift of Dirac voltage. Increasing a primary electron dose to 1 × 10(19) e(-) per cm(2) results in a significant increase of carbon deposition, such that it covers the entire graphene conduction channel at high surface density, leading to n-doping of graphene channel. Collectively, these findings establish a unique capability of FEBID technique to dynamically modulate the doping state of graphene, thus enabling a new route to resist-free, "direct-write" functional patterning of graphene-based electronic devices with potential for on-demand re-configurability.
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Affiliation(s)
- S Kim
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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50
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Hwang JS, Oh TH, Kim SH, Han SS, Lee SJ, Lee SG, Lee YJ, Jang SS. Effect of solvent on electrical conductivity and gas sensitivity of PEDOT: PSS polymer composite films. J Appl Polym Sci 2015. [DOI: 10.1002/app.42628] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jun Sung Hwang
- Department of Nano; Medical and Polymer Materials; Yeungnam University; Gyeongsan 712-749 Korea
- Nano & Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology; Daegu 711-873 Korea
| | - Tae Hwan Oh
- Department of Nano; Medical and Polymer Materials; Yeungnam University; Gyeongsan 712-749 Korea
| | - Se Hyun Kim
- Department of Nano; Medical and Polymer Materials; Yeungnam University; Gyeongsan 712-749 Korea
| | - Sung Soo Han
- Department of Nano; Medical and Polymer Materials; Yeungnam University; Gyeongsan 712-749 Korea
| | - Sung Jun Lee
- Nano & Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology; Daegu 711-873 Korea
| | - Se Geun Lee
- Nano & Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology; Daegu 711-873 Korea
| | - Young Jae Lee
- Nano & Bio Research Division; Daegu Gyeongbuk Institute of Science and Technology; Daegu 711-873 Korea
| | - Seung Soon Jang
- School of Materials Science and Engineering; Georgia Institute of Technolgy; Atlanta Georgia 30332 USA
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