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Tolmachev DA, Malkamäki M, Linder MB, Sammalkorpi M. Spidroins under the Influence of Alcohol: Effect of Ethanol on Secondary Structure and Molecular Level Solvation of Silk-Like Proteins. Biomacromolecules 2023; 24:5638-5653. [PMID: 38019577 PMCID: PMC10716855 DOI: 10.1021/acs.biomac.3c00637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 11/08/2023] [Accepted: 11/08/2023] [Indexed: 11/30/2023]
Abstract
Future sustainable materials based on designer biomolecules require control of the solution assembly, but also interfacial interactions. Alcohol treatments of protein materials are an accessible means to this, making understanding of the process at the molecular level of seminal importance. We focus here on the influence of ethanol on spidroins, the main proteins of silk. By large-scale atomistically detailed molecular dynamics (MD) simulations and interconnected experiments, we characterize the protein aggregation, secondary structure changes, molecular level origins of them, and solvation environment changes for the proteins, as induced by ethanol as a solvation additive. The MD and circular dichoroism (CD) findings jointly show that ethanol promotes ordered structure in the protein molecules, leading to an increase of helix content and turns but also increased aggregation, as revealed by dynamic light scattering (DLS) and light microscopy. The structural changes correlate at the molecular level with increased intramolecular hydrogen bonding. The simulations reveal that polar amino acids, such as glutamine and serine, are most influenced by ethanol, whereas glycine residues are most prone to be involved in the ethanol-induced secondary structure changes. Furthermore, ethanol engages in interactions with the hydrophobic alanine-rich regions of the spidroin, significantly decreasing the hydrophobic interactions of the protein with itself and its surroundings. The protein solutes also change the microstructure of water/ethanol mixtures, essentially decreasing the level of larger local clustering. Overall, the work presents a systematic characterization of ethanol effects on a widely used, common protein type, spidroins, and generalizes the findings to other intrinsically disordered proteins by pinpointing the general features of the response. The results can aid in designing effective alcohol treatments for proteins, but also enable design and tuning of protein material properties by a relatively controllable solvation handle, the addition of ethanol.
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Affiliation(s)
- Dmitry A. Tolmachev
- Department
of Chemistry and Materials Science, Aalto
University, P.O. Box 16100, FI-00076 Aalto, Finland
- Academy
of Finland Center of Excellence in Life-Inspired Hybrid Materials
(LIBER), Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
| | - Maaria Malkamäki
- Department
of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
- Academy
of Finland Center of Excellence in Life-Inspired Hybrid Materials
(LIBER), Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
| | - Markus B. Linder
- Department
of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
- Academy
of Finland Center of Excellence in Life-Inspired Hybrid Materials
(LIBER), Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
| | - Maria Sammalkorpi
- Department
of Chemistry and Materials Science, Aalto
University, P.O. Box 16100, FI-00076 Aalto, Finland
- Department
of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
- Academy
of Finland Center of Excellence in Life-Inspired Hybrid Materials
(LIBER), Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
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2
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Zhang C, Gong X, Zeng J, Peng Z, Li X, Lin L, Peng Y, Wang S. Effects of solvent phase recycling on microalgae liquefaction in ethanol: Bio-oil production and nitrogen transformation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 902:166069. [PMID: 37544452 DOI: 10.1016/j.scitotenv.2023.166069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 08/01/2023] [Accepted: 08/03/2023] [Indexed: 08/08/2023]
Abstract
Liquefaction of microalgae in ethanol offers an eco-friendly bio-oil alternative, but solvent recycling is crucial for sustainability due to extra costs. In this work, Chlorella vulgaris was liquefied in supercritical ethanol at 260 °C, and the solvent phase (SP) separated from bio-oil was recovered and reused. Five liquefaction cycles were performed at identical temperature and pressure conditions to investigate the effects on oil production and nitrogen transformation. The findings demonstrated a gradual increase in water content in recycled SP. Ethanol-water co-solvent as the reaction medium promoted the decomposition and re-polymerization of protein in raw material, thus increasing the bio-oil yield (76.84 %) and higher heating value (33.53 MJ/kg) to some extent. Simultaneously, the relative nitrogen content of bio-oil rose from 8.03 % to 8.52 %, predominantly in the form of nitrogen heterocycles. The potential pathway for nitrogen conversion was revealed, which establishes a theoretical basis for the subsequent denitrification of bio-oil.
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Affiliation(s)
- Chuxuan Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Xun Gong
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, PR China.
| | - Jianhui Zeng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Zhengkang Peng
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Xiaomin Li
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Luqiu Lin
- China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Yang Peng
- School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, PR China
| | - Shuang Wang
- School of Energy and Power Engineering, Jiangsu University, Jiangsu 212013, PR China
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3
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Chowdhury S, Ghorai PK, Maity NC, Kumbhakar K, Biswas R. Identical Diffusion Distributions and Co-Cluster Formation Dictate Azeotrope Formation: Microscopic Evidences and Experimental Signatures. J Phys Chem B 2023; 127:8417-8431. [PMID: 37735851 DOI: 10.1021/acs.jpcb.3c02486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
What selects azeotropic pairs and governs the azeotropic conditions (composition and temperature) is an open and intriguing question. A combined simulation and experimental work presented here investigates this by considering ethanol-water mixtures. We find identical distributions of center-of-mass diffusion coefficients for ethanol and water molecules under the azeotropic condition (95.5 wt % ethanol +4.5 wt % water, Tazeo = 351.1K). Moreover, the particle displacements show strong interspecies correlations at Tazeo. Interestingly, simulated reorientation time distributions become identical at Tazeo but at a composition different from that at which the translational diffusion distributions overlapped. Cluster analyses indicate that solutions at Tazeo with xwater ≤ 15 wt % are more microheterogeneous than those with higher water content, although no anomaly in the composition-dependent solution structural properties was detected. Ethanol-water and ethanol-ethanol interaction energies show pronounced nonideal composition dependence, but the size of the relative fluctuations in them remained small (∼0.5kBT). Rare water-water H-bonding, predominant water-ethanol H-bonding, and a sizable population of "free" water molecules characterize the azeotropic solutions. The red edge excitation spectroscopic (REES) measurements with a dissolved anionic fluorescent dye, coumarin343 (C343), support the predicted solution microheterogeneity by showing a nonmonotonic composition dependence of the excitation energy-induced changes in the fluorescence emission spectral frequencies and bandwidths, the largest changes being under the azeotropic condition. Subsequent dynamic anisotropy measurements reveal a nonmonotonic composition dependence of C343 rotation times with a peak under the azeotropic condition. In summary, equalization of the component translational diffusion coefficients and solution microheterogeneity with regular composition dependence of the solution structure appear to characterize the ethanol-water azeotrope.
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Affiliation(s)
- Shrestha Chowdhury
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Pradip Kr Ghorai
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur 741246, India
| | - Narayan Chandra Maity
- Department of Chemical and Biological Sciences, S.N. Bose National Centre for Basic Sciences, Kolkata 700106, India
| | - Kajal Kumbhakar
- Department of Chemical and Biological Sciences, S.N. Bose National Centre for Basic Sciences, Kolkata 700106, India
| | - Ranjit Biswas
- Department of Chemical and Biological Sciences, S.N. Bose National Centre for Basic Sciences, Kolkata 700106, India
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4
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Abdulkareem U, Kartha TR, Madhurima V. Radial distribution and hydrogen bonded network graphs of alcohol-aniline binary mixture. J Mol Model 2023; 29:151. [PMID: 37084111 DOI: 10.1007/s00894-023-05558-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 04/14/2023] [Indexed: 04/22/2023]
Abstract
CONTEXT Hydrogen bonds play a vital role in the stability and functioning of biomolecules. Suitable binary liquids are often used as prototypes for the study of biologically significant hydrogen bond studies and their intricate networks. Often, such systems show deviations in their physico-chemical properties from ideal conditions. As a continuation of our research interest in biologically important hydrogen-bonded systems, this paper reports the classical molecular dynamic studies on mixtures of aniline with 8 primary alcohols (CRH2R+1-OH, R = 1 to 8) for the complete concentration range. The energetics results indicate the predominance of OH--O interactions over other hydrogen bonds. Structures in the network are analyzed using radial distribution function (RDF), hydrogen bond statistics, and graph theoretical analysis (GTA). Coordination numbers, hydrogen bond statistics, and GTA show a bunching of alcohol-alcohol hydrogen bonds for lower aniline concentrations, while the aniline-aniline interactions are not affected by changes in the concentration. METHODS Interaction energies are calculated using B3LYP/6-311G++(d, p) density functional theory using Gaussian-09. The molecular dynamics simulations are carried out using GROMACS (V 2020.6) with the OPLS/AA force field and the simulation box is visualized using VMD. The NetworkX Python package is used for GTA calculation.
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Affiliation(s)
- U Abdulkareem
- Department of Physics, School of Basic and Applied Sciences, Central University of Tamil Nadu, Thiruvarur, Tamil Nadu, 610005, India.
| | - Thejus R Kartha
- uGDX Institute of Technology, Atlas Skilltech University, Kurla West, Mumbai, 400 070, India
| | - V Madhurima
- Department of Physics, School of Basic and Applied Sciences, Central University of Tamil Nadu, Thiruvarur, Tamil Nadu, 610005, India
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5
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Zhao X, Wang J, Lian L, Zhang G, An P, Zeng K, He H, Yuan T, Huang J, Wang L, Liu YN. Oxygen Vacancy-Reinforced Water-Assisted Proton Hopping for Enhanced Catalytic Hydrogenation. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Xiaojun Zhao
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P. R. China
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
- Henan Province Industrial Technology Research Institute of Resources and Materials, School of Material Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Jin Wang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Lizhen Lian
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Guangji Zhang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
- School of Chemistry and Materials Engineering, Huizhou University, Huizhou, Guangdong 516007, P. R. China
| | - Ping An
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Ke Zeng
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Haichuan He
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Tiechui Yuan
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P. R. China
| | - Jianhan Huang
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
| | - Liqiang Wang
- Henan Province Industrial Technology Research Institute of Resources and Materials, School of Material Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
- State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - You-Nian Liu
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P. R. China
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interface Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, Zhejiang 311121, P. R. China
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6
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Cui R, Narayanan Nair AK, Yang Y, Sun S. Molecular Simulation Study of Montmorillonite in Contact with Ethanol. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c03903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Ronghao Cui
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Arun Kumar Narayanan Nair
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Yafan Yang
- State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
| | - Shuyu Sun
- Physical Science and Engineering Division (PSE), Computational Transport Phenomena Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
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7
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Seo J, Choi S, Singh R, Choi JH. Spatial Inhomogeneity and Molecular Aggregation behavior in Aqueous Binary Liquid Mixtures. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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8
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Impact of ethanol shock on the structural change and emulsifying capacity of bovine lactoferrin. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Carravetta V, Gomes AHDA, Marinho RDRT, Öhrwall G, Ågren H, Björneholm O, de Brito AN. An atomistic explanation of the ethanol-water azeotrope. Phys Chem Chem Phys 2022; 24:26037-26045. [PMID: 36268753 DOI: 10.1039/d2cp03145k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ethanol and water form an azeotropic mixture at an ethanol molecular percentage of ∼91% (∼96% by volume), which prohibits ethanol from being further purified via distillation. Aqueous solutions at different concentrations in ethanol have been studied both experimentally and theoretically. We performed cylindrical micro-jet photoelectron spectroscopy, excited by synchrotron radiation, 70 eV above C1s ionization threshold, providing optimal atomic-scale surface-probing. Large model systems have been employed to simulate, by molecular dynamics, slabs of the aqueous solutions and obtain an atomistic description of both bulk and surface regions. We show how the azeotropic behaviour results from an unexpected concentration-dependence of the surface composition. While ethanol strongly dominates the surface and water is almost completely depleted from the surface for most mixing ratios, the different intermolecular bonding patterns of the two components cause water to penetrate to the surface region at high ethanol concentrations. The addition of surface water increases its relative vapour pressure, giving rise to the azeotropic behaviour.
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Affiliation(s)
- Vincenzo Carravetta
- CNR-IPCF, Institute of Chemical and Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy.
| | - Anderson Herbert de Abreu Gomes
- Dept. of Applied Physics, Institute of Physics "Gleb Wataghin", Campinas University, CEP: 13083-859 Campinas, SP, Brazil. .,Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research on Energy and Materials (CNPEM), PO Box 6192, 13083-970, Campinas, SP, Brazil
| | - Ricardo Dos Reis Teixeira Marinho
- Institute of Physics, Federal University of Bahia, 40.170-115, Salvador, BA, Brazil.,Institute of Physics, Brasilia University (UnB), 70.919-970, Brasília, Brazil
| | - Gunnar Öhrwall
- MAX IV Laboratory, Lund University, Box 118, SE-22100 Lund, Sweden
| | - Hans Ågren
- Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
| | - Olle Björneholm
- Division of X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
| | - Arnaldo Naves de Brito
- Dept. of Applied Physics, Institute of Physics "Gleb Wataghin", Campinas University, CEP: 13083-859 Campinas, SP, Brazil.
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10
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Ghanghas R, Vasudevan S. Geometries of hydrogen bonds in water-ethanol mixtures from ab initio molecular dynamics simulations. Phys Chem Chem Phys 2022; 24:23570-23577. [PMID: 36129380 DOI: 10.1039/d2cp01238c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We outline a simple procedure to determine the geometry of hydrogen bonds between different molecular species in binary mixtures from ab initio molecular dynamics (AIMD) trajectories. Here we determine the geometry of the hydrogen bonds arising from intermolecular OH⋯O interactions between different H-bonded pairs, water-water, ethanol-ethanol and water-ethanol in water-alcohol mixtures at different compositions by plotting the intermolecular non-bonded OH⋯O and O⋯O distances, and the ∠HO⋯O (θ) angles for each of the possible pairs in the ensemble. Two regions separate out in each of the scatter-plots; the one with short OH⋯O and O⋯O intermolecular distances and almost linear ∠HO⋯O angles may be identified as the region where the intermolecular OH⋯O geometry would be favorable for hydrogen bonding. Using the different geometric criteria for each of the three possible H-bonded pairs we estimate the average number of water and ethanol molecules that are hydrogen bonded to a water molecule, and to an ethanol molecule, respectively, at different mole fractions of the mixture. We validate the results from values of the chemical shift of the two OH resonances (water and ethanol) in the proton NMR spectra of the mixtures at different concentrations as these values are known to be sensitive to the local chemical environment of the resonating nuclei.
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Affiliation(s)
- Ritu Ghanghas
- Department of Inorganic and Physical Chemistry, IISc, Bangalore, India.
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11
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Pereira D, Bierlich J, Kobelke J, Pereira V, Ferreira MS. Optical Fiber Sensor for Monitoring the Evaporation of Ethanol–Water Mixtures. SENSORS 2022; 22:s22155498. [PMID: 35898002 PMCID: PMC9331179 DOI: 10.3390/s22155498] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 07/16/2022] [Accepted: 07/21/2022] [Indexed: 02/04/2023]
Abstract
An inline optical fiber sensor is proposed to monitor in real time the evaporation process of ethanol–water binary mixtures. The sensor presents two interferometers, a cladding modal interferometer (CMI) and a Mach–Zehnder interferometer (MZI). The CMI is used to acquire the variations in the external medium refractive index, presenting a maximum sensitivity of 387 nm/RIU, and to attain the variation in the sample concentration profile, while the MZI monitors temperature fluctuations. For comparison purposes, an image analysis is also conducted to obtain the droplet profile. The sensor proposed in this work is a promising alternative in applications where a rigorous measurement of volatile organic compound concentrations is required, and in the study of chemical and physical properties related to the evaporation process.
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Affiliation(s)
- Diana Pereira
- i3N & Department of Physics, University of Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal; (D.P.); (V.P.)
| | - Jörg Bierlich
- Leibniz Institute of Photonic Technology IPHT, Albert-Einstein-Str. 9, 07745 Jena, Germany; (J.B.); (J.K.)
| | - Jens Kobelke
- Leibniz Institute of Photonic Technology IPHT, Albert-Einstein-Str. 9, 07745 Jena, Germany; (J.B.); (J.K.)
| | - Vanda Pereira
- i3N & Department of Physics, University of Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal; (D.P.); (V.P.)
- ISOPlexis—Sustainable Agriculture and Food Technology Center, University of Madeira, Campus da Penteada, 9020-105 Funchal, Portugal
| | - Marta S. Ferreira
- i3N & Department of Physics, University of Aveiro, Campus Universitario de Santiago, 3810-193 Aveiro, Portugal; (D.P.); (V.P.)
- Correspondence: ; Tel.: +351-234370899
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12
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Nagasaka M, Bouvier M, Yuzawa H, Kosugi N. Hydrophobic Cluster Formation in Aqueous Ethanol Solutions Probed by Soft X-ray Absorption Spectroscopy. J Phys Chem B 2022; 126:4948-4955. [PMID: 35748647 DOI: 10.1021/acs.jpcb.2c02990] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrophobic cluster structures in aqueous ethanol solutions at different concentrations have been investigated by soft X-ray absorption spectroscopy (XAS). In the O K-edge XAS, we have found that hydrogen bond structures among water molecules are enhanced in the middle-concentration region by the hydrophobic interaction of the ethyl groups in ethanol. In the C K-edge XAS, the lower energy features arise from a transition from the terminal methyl C 1s electron to an unoccupied orbital of 3s Rydberg character, which is sensitive to the nearest-neighbor intermolecular interactions. From the comparison of C K-edge XAS with the inner-shell calculations, we have found that ethanol clusters are easily formed in the middle-concentration region due to the hydrophobic interaction of the ethyl group in ethanol, resulting in the enhancement of the hydrogen bond structures among water molecules. This behavior is different from aqueous methanol solutions, where the methanol-water mixed clusters are more predominant in the middle-concentration region due to the relatively weak hydrophobic interactions of the methyl group in methanol.
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Affiliation(s)
- Masanari Nagasaka
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Myodaiji, Okazaki 444-8585, Japan
| | - Mathilde Bouvier
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Hayato Yuzawa
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Nobuhiro Kosugi
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan.,SOKENDAI (The Graduate University for Advanced Studies), Myodaiji, Okazaki 444-8585, Japan
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13
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Swathi PV, Abdulkareem U, Kartha TR, Madhurima V. Hydrogen Bonding in 1‐Propanol‐Ethanol Binary Mixture: Experimental and Modeling Approaches. ChemistrySelect 2022. [DOI: 10.1002/slct.202200413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- P. V. Swathi
- Department of Physics School of Basic and Applied Sciences Central University of Tamil Nadu Thiruvarur 610005 Tamil Nadu India
| | - U. Abdulkareem
- Department of Physics School of Basic and Applied Sciences Central University of Tamil Nadu Thiruvarur 610005 Tamil Nadu India
| | - Thejus R Kartha
- International School of Engineering (INSOFE) 2nd Floor, Jyothi Imperial, Vamsiram Builders, Gachibowli Hyderabad Telangana 500032 India
| | - V. Madhurima
- Department of Physics School of Basic and Applied Sciences Central University of Tamil Nadu Thiruvarur 610005 Tamil Nadu India
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14
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Biswakarma D, Dey N, Bhattacharya S. Molecular design of amphiphiles for Microenvironment-Sensitive kinetically controlled gelation and their utility in probing alcohol contents. J Colloid Interface Sci 2022; 615:335-345. [DOI: 10.1016/j.jcis.2021.12.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 12/04/2021] [Accepted: 12/09/2021] [Indexed: 11/26/2022]
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15
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Saw EN, Kanokkanchana K, Amin HMA, Tschulik K. Unravelling Anion Solvation in Water‐Alcohol Mixtures by Single Entity Electrochemistry. ChemElectroChem 2022. [DOI: 10.1002/celc.202101435] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- En Ning Saw
- Chair of Analytical Chemistry II Faculty of Chemistry and Biochemistry Ruhr University Bochum Bochum 44801 Germany
| | - Kannasoot Kanokkanchana
- Chair of Analytical Chemistry II Faculty of Chemistry and Biochemistry Ruhr University Bochum Bochum 44801 Germany
| | - Hatem M. A. Amin
- Chair of Analytical Chemistry II Faculty of Chemistry and Biochemistry Ruhr University Bochum Bochum 44801 Germany
| | - Kristina Tschulik
- Chair of Analytical Chemistry II Faculty of Chemistry and Biochemistry Ruhr University Bochum Bochum 44801 Germany
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16
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Insights on choline chloride-based deep eutectic solvent (reline) + primary alcohol mixtures: a molecular dynamics simulation study. J Mol Model 2022; 28:30. [PMID: 34993665 DOI: 10.1007/s00894-021-05017-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Accepted: 12/23/2021] [Indexed: 10/19/2022]
Abstract
Deep eutectic solvents (DESs) emerged as green solvents for new generation technologies owing to their high chemical and thermal stability. Addition of restricted amount of organic solvents into the DESs plays a significant role in the improvement of thermodynamic and the transport properties to work as a potential solvent in process industries. In this paper, molecular dynamics (MD) simulations were performed to understand the thermophysical and transport properties of choline chloride-based DES (reline) and primary alcohol (methanol and ethanol) mixture in relation to microscopic structure. Density, radial distribution function, coordination number, average number of H-bond, diffusion coefficient and spatial distribution function was calculated in order to understand the structure and involvement of H-bond network at an atomic level. H-bond and spatial distribution function analyses revealed that the chloride ion prefers to be spatially distributed around hydroxyl group of alcohol and found to be more pronounced upon increase in alcohol concentration. As a consequence, it was observed that the H-bonds between Cl- and urea decreases overall with the loading of alcohol and effect is more pronounced beyond a concentration of 0.4. Self-diffusion values for choline, Cl- and urea were found to be increased significantly upon increase in concentration of alcohol from 0.6 to 0.8. Overall, our simulation points to the interplay and interactions between the chloride ions and the solvents in determining the structural and transport properties of choline chloride-based DES.
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Nair AS, Bagchi B. Rigid Cations Induce Enhancement of Microheterogeneity and Exhibit Anomalous Ion Diffusion in Water-Ethanol Mixtures. J Phys Chem B 2021; 125:12274-12291. [PMID: 34726411 DOI: 10.1021/acs.jpcb.1c07698] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Because of the amphiphilic nature of ethanol in the aqueous solution, ions cause an interesting microheterogeneity where the water molecules and the hydroxy groups of ethanol preferentially solvate the ions, while the ethyl groups tend to occupy the intervening space. Using computer simulations, we study the dynamics of rigid monovalent cations (Li+, Na+, K+, and Cs+) in aqueous ethanol solutions with chloride as the counterion. We vary both the size of the ions and the composition of the mixture to explore size- and composition-dependent ion diffusion. The relative stability of enhanced microheterogeneous configurations makes ion diffusion slower than what would be surmised by using the bulk properties of the mixture, using the Stokes-Einstein relation. We study the structure through partial radial distribution functions and the stability through coordination number fluctuations. The ion diffusion coefficient exhibits sharp re-entrant behavior when plotted against viscosity varied by composition. Our studies reveal multiple anomalous features of ion motion in this mixture. We formulate a mode-coupling theory (MCT) that takes into account the interaction between different dynamical components; MCT can incorporate the effects of heterogeneous dynamics and nonlinearity in composition dependence that arise from the feedback between mutually dependent ion-solvent dynamics.
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Affiliation(s)
- Anjali S Nair
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Biman Bagchi
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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18
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A DFT and molecular dynamics simulation study of single-walled carbon nanotube as a drug delivery system for few model nitrogen mustard drugs. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130877] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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19
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Pyne P, Das Mahanta D, Gohil H, Prabhu SS, Mitra RK. Correlating solvation with conformational pathways of proteins in alcohol-water mixtures: a THz spectroscopic insight. Phys Chem Chem Phys 2021; 23:17536-17544. [PMID: 34369530 DOI: 10.1039/d1cp01841h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water, being an active participant in most of the biophysical processes, is important to trace how protein solvation changes as its conformation evolves in the presence of solutes or co-solvents. In this study, we investigate how the secondary structures of two diverse proteins - lysozyme and β-lactoglobulin - change in the aqueous mixtures of two alcohols - ethanol and 2,2,2-trifluoroethanol (TFE) using circular dichroism measurements. We observe that these alcohols change the secondary structures of these proteins and the changes are protein-specific. Subsequently, we measure the collective solvation dynamics of these two proteins both in the absence and in the presence of alcohols by measuring the frequency-dependent absorption coefficient (α(ν)) in the THz (0.1-1.2 THz) frequency domain. The alcohol-water mixtures exhibit a non-ideal behaviour with the highest absorption difference (Δα) obtained at Xalcohol = 0.2. The protein solvation in the presence of the alcohols shows an oscillating behaviour in which Δαprotein changes with Xalcohol. Such an oscillatory behaviour of protein solvation results from a delicate interplay between the protein-water, protein-alcohol and water-alcohol associations. We attempt to correlate the various structural conformations of the proteins with the associated solvation.
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Affiliation(s)
- Partha Pyne
- Department of Chemical, Biological & Macromolecular Sciences, S.N. Bose National Centre for Basic Sciences, Block-JD; Sector-III; Salt Lake, Kolkata-700106, India.
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Hongbo X, Dan L, Suli W, Shuai F, Chao M, Bin D. H 2O- and ethanol concentration-responsive polymer/gel inverse opal photonic crystal. J Colloid Interface Sci 2021; 605:803-812. [PMID: 34371425 DOI: 10.1016/j.jcis.2021.07.112] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 07/19/2021] [Accepted: 07/20/2021] [Indexed: 12/22/2022]
Abstract
Responsive photonic crystals have attracted much attention due to their strong capability to manipulate the propagation of light in the visible region, but it is still a big challenge to invisibility and mechanical stability. Here, the novel Poly(ether sulfone)/Poly(acrylic acid) inverse opal photonic crystals, which have high mechanical stability and can release visible patterns after wetting with water, are discussed. The Poly(ether sulfone)/Poly(acrylic acid) inverse opal photonic crystals are also responsive to the concentration of ethanol, and the structural color response times increase with increasing ethanol concentration. This design uses the selective infiltration, hydrogen bonding and capillary action of solvent to realize the spectral diversity of reflectance. Owing to the high polarity and hydrogen bonding ability of carboxyl groups, water molecules are adsorbed easily by the poly(acrylic acid) gel. Subsequently, the encrypted information is decrypted due to the redshift of the structural color. Because of its lower polarity and hydrogen bonding ability relative to water, ethanol can impede the absorption of solvent by gel. Therefore, the ethanol concentration can be identified based on the structural color response time. Furthermore, reliable information decryption methods make Poly(ether sulfone)/Poly(acrylic acid) inverse opal photonic crystals potentially uesful as trusted encryption devices.
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Affiliation(s)
- Xia Hongbo
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116024, China
| | - Li Dan
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116024, China
| | - Wu Suli
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China
| | - Feng Shuai
- School of Science, Minzu University of China, Beijing 100081, China.
| | - Meng Chao
- School of Science, Minzu University of China, Beijing 100081, China
| | - Dong Bin
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116024, China.
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21
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Essafri I, Ghoufi A. Effect of the alkyl chain length on the non-ideality and the microstructure of alcohol binary mixtures. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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Pothoczki S, Pethes I, Pusztai L, Temleitner L, Ohara K, Bakó I. Properties of Hydrogen-Bonded Networks in Ethanol-Water Liquid Mixtures as a Function of Temperature: Diffraction Experiments and Computer Simulations. J Phys Chem B 2021; 125:6272-6279. [PMID: 34078085 PMCID: PMC8279560 DOI: 10.1021/acs.jpcb.1c03122] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
New X-ray and neutron
diffraction experiments have been performed
on ethanol–water mixtures as a function of decreasing temperature,
so that such diffraction data are now available over the entire composition
range. Extensive molecular dynamics simulations show that the all-atom
interatomic potentials applied are adequate for gaining insight into
the hydrogen-bonded network structure, as well as into its changes
on cooling. Various tools have been exploited for revealing details
concerning hydrogen bonding, as a function of decreasing temperature
and ethanol concentration, like determining the H-bond acceptor and
donor sites, calculating the cluster-size distributions and cluster
topologies, and computing the Laplace spectra and fractal dimensions
of the networks. It is found that 5-membered hydrogen-bonded cycles
are dominant up to an ethanol mole fraction xeth = 0.7 at room temperature, above which the concentrated
ring structures nearly disappear. Percolation has been given special
attention, so that it could be shown that at low temperatures, close
to the freezing point, even the mixture with 90% ethanol (xeth = 0.9) possesses a three-dimensional (3D)
percolating network. Moreover, the water subnetwork also percolates
even at room temperature, with a percolation transition occurring
around xeth = 0.5.
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Affiliation(s)
- Szilvia Pothoczki
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - Ildikó Pethes
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - László Pusztai
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary.,International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - László Temleitner
- Wigner Research Centre for Physics, Konkoly-Thege Miklós út 29-33, H-1121 Budapest, Hungary
| | - Koji Ohara
- Diffraction and Scattering Division, JASRI, SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Imre Bakó
- Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
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Choi S, Parameswaran S, Choi JH. Effects of molecular shape on alcohol aggregation and water hydrogen bond network behavior in butanol isomer solutions. Phys Chem Chem Phys 2021; 23:12976-12987. [PMID: 34075966 DOI: 10.1039/d1cp00634g] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Despite butanol isomers such as n-butanol, sec-butanol, isobutanol and tert-butanol having the same chemical formula, their liquid-liquid phase diagrams are distinct. That is, tert-butanol is miscible in water at all concentrations, while the other three butanol isomers are partially miscible under ambient conditions. The molecular shape of tert-butanol is close to globular and differs from the other three butanol molecules with a relatively long carbon chain. By performing molecular dynamics simulations and graph theoretical analysis of the four water-butanol isomer mixtures at varying concentrations, we show how distinct butanol aggregates are formed which depend upon the molecular shape and affect the water H-bond network structure and phase diagram in the binary liquid. The three butanol isomers of n-butanol, sec-butanol and isobutanol at concentrated solutions form chain-like alcohol aggregates, but tert-butanol forms small aggregates due to the distinct packing behavior caused by its globular molecular shape. By employing the graph theoretical analysis such as the degree distribution and the eigenvalue spectrum from the adjacency matrix in the graphical representation of the alcohol H-bond network, we show that the tert-butanol aggregates have a different morphological structure from that of the other three butanol isomers in aqueous solution. The graph theoretically distinct butanol aggregates are categorized into two groups, water-compatible and water-incompatible, depending upon the interaction between the alcohol and water molecules. Based upon our observations, we propose that the water-incompatible networks of n-butanol, sec-butanol and isobutanol aggregates do not change the water structure significantly, forming two separate liquid phases that are alcohol-rich and water-rich. However, the water-compatible network of tert-butanol aggregates has a considerable interaction with the water molecules and causes significant disruption of the water H-bond network, forming a homogeneous solution. Understanding the alcohol aggregation behavior and water structure in butanol-water mixtures provides a critical clue in appreciating fundamental issues such as miscibility and phase separation in aqueous solution systems.
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Affiliation(s)
- Seungeui Choi
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Saravanan Parameswaran
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Jun-Ho Choi
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
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24
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The Structures of ZnCl 2-Ethanol Mixtures, a Spectroscopic and Quantum Chemical Calculation Study. Molecules 2021; 26:molecules26092498. [PMID: 33922922 PMCID: PMC8123294 DOI: 10.3390/molecules26092498] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/20/2021] [Accepted: 04/23/2021] [Indexed: 11/16/2022] Open
Abstract
We report in this article the structural properties, spectral behavior and heterogeneity of ZnCl2-ethanol (EtOH) mixtures in a wide-composition range (1:3 to 1:14 in molar ratios), using ATR-FTIR spectroscopy and quantum chemical calculations. To improve the resolution of the initial IR spectra, excess spectroscopy and two-dimensional correlation spectroscopy were employed. The transformation process was suggested to be from EtOH trimer and EtOH tetramer to EtOH monomer, EtOH dimer and ZnCl2-3EtOH complex upon mixing. The theoretical findings showed that increasing the content of EtOH was accompanied with the flow of negative charge to ZnCl2. This led to reinforcement of the Zn←O coordination bonds, increase of the ionic character of Zn‒Cl bond and weakening and even dissociation of the Zn‒Cl bond. It was found that in some of the ZnCl2-EtOH complexes optimized at the gas phase or under the solvent effect, there existed hydroxyls with a very special interactive array in the form of Cl‒Zn+←O‒H…Cl-, which incredibly red-shifted to wavenumbers <3000 cm-1. This in-depth study shows the physical insights of the respective electrolyte alcoholic solutions, particularly the solvation process of the salt, help to rationalize the reported experimental results, and may shed light on understanding the properties of the deep eutectic solvents formed from ZnCl2 and an alcohol.
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25
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Servis MJ, Piechowicz M, Skanthakumar S, Soderholm L. Molecular-scale origins of solution nanostructure and excess thermodynamic properties in a water/amphiphile mixture. Phys Chem Chem Phys 2021; 23:8880-8890. [PMID: 33876047 DOI: 10.1039/d1cp00082a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The molecular and nanoscale origins of nonideality in excess thermodynamic properties are essential to understanding cosolvent mixtures, yet they remain challenging to determine. Here, we consider a binary mixture of water and an amphiphile, N,N,N',N'-tetramethylmalonamide (TMMA), which is characterized by strong hydrogen bonding between the two components and no hydrogen bonding between amphiphiles. Using molecular dynamics simulation, validated with excess volume measurements and X-ray scattering, we identify three distinct solution regimes across the composition range of the binary mixture and find that the transition between two of these regimes, marked by the water percolation threshold, is closely correlated with minima in the excess volume and excess enthalpy. Structural analysis of the simulations reveals an interplay between local interactions and solution nanostructure, determined by the relative strength of the water-water and water-amphiphile hydrogen bonding interactions. By comparison with other amphiphiles, such as linear alcohols, the relative strength of like and unlike interactions between water and amphiphile affects the relationship between thermodynamics and structural regimes. This provides insight into how molecular forces of mutual solvation interact across length scales and how they manifest in excess thermodynamic properties.
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Affiliation(s)
- Michael J Servis
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA.
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26
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Liang S, Song Y, Zhang Z, Mu B, Li R, Li Y, Yang H, Wang M, Pan F, Jiang Z. Construction of graphene oxide membrane through non-covalent cross-linking by sulfonated cyclodextrin for ultra-permeable butanol dehydration. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118938] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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27
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Primorac T, Požar M, Sokolić F, Zoranić L. The influence of binary mixtures' structuring on the calculation of Kirkwood-Buff integrals: A molecular dynamics study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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28
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Abstract
Prepeak in the structure factor of alcohols is known for a half century and was attributed to one of two mechanisms (i) self-assembly in aggregates and (ii) existence of spatial heterogeneity. Although both explnations are often argued the molecular origin is yet unclear. In this work, molecular dynamics simulation of neat alcohols and their mixtures in the presence of an apolar liquid in bulk and in confined phases is performed to unveil and to clarify the origin of the prepeak at the molecular scale. Unambiguously, we show that the existence of the prepeak is the result of the self-assembly in clusters leading to long-range correlations rather than the spatial heterogeneity. We also establish that the confinement of neat liquids at the nanoscale does not erase the clustering and the prepeak but strongly reduce the spatial heterogeneity. Regarding the binary alcohol/toluene mixtures, we highlight the possibility to erase the clustering and the spatial heterogeneity from nanoconfinement inducing the formation of a core-shell structure. By tuning the interfacial chemistry and pore size, we shed light on the possibility to control the spatial heterogeneity, the self-assembly, and the microphase separation.
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Affiliation(s)
- Aziz Ghoufi
- Institut de Physique de Rennes, IPR, CNRS-Université de Rennes 1, UMR CNRS 6251, 35042 Rennes, France
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29
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Cea-Klapp E, Míguez JM, Gómez-Álvarez P, Blas FJ, Quinteros-Lama H, Garrido JM. Molecular modelling techniques for predicting liquid-liquid interfacial properties of methanol plus alkane ( n-hexane, n-heptane, n-octane) mixtures. Phys Chem Chem Phys 2020; 22:27121-27133. [PMID: 33225339 DOI: 10.1039/d0cp04823b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, the liquid-liquid interfacial properties of methanol plus n-alkane (n-hexane, n-heptane, n-octane) mixtures are investigated at atmospheric pressure by two complementary molecular modelling techniques; namely, molecular dynamic simulations (MD) and density gradient theory (DGT) coupled with the PC-SAFT (perturbed-chain statistical associating fluid theory) equation of state. Furthermore, two molecular models of methanol are used, which are based on a non-polarisable three site approach. On the one hand, is the original (flexible) TraPPE-UA model force field. On the other hand, is the rigid approximation denoted as OPLS/2016. In both cases, n-alkanes are modelled using the TraPPE-UA model. Simulations are performed using the direct coexistence technique in the ensemble. Special attention is paid to the comparison between the estimations obtained from different methanol models, the available experimental data and theoretical calculations. In all cases, the rigid model is capable of predicting the experimental phase equilibrium and interfacial properties accurately. Unsurprisingly, the methanol-rich density and interfacial tension are overestimated using the TraPPE model combined with Lorentz-Berthelot mixing rules for predicting the mixture behaviour. Accurate comparison between MD and DGT plus PC-SAFT requires consideration of the cross-interactions between individual influence parameters and fitting the βij values. This latter aspect is particularly important because it allows the exploitation of the link between the EOS model and the direct molecular simulation of the corresponding fluid. At the same time, it was demonstrated that the key property defining the interfacial tension value is the absolute concentration of methanol in the methanol-rich phase. This behaviour indicates that there are more hydrogens bonded with each other, and they interact favourably with an increasing number of carbon atoms in the alkane.
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Affiliation(s)
- Esteban Cea-Klapp
- Department of Chemical Engineering, Universidad de Concepción, Concepción 4070386, Chile.
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30
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Viscosity study of tert-butyl alcohol aqueous solution by Brownian motion and gravimetric capillaries. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114170] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Pinzan F, Artzner F, Ghoufi A. Force-Field Simulations of a Hydrated Lanreotide-Based Derivative: Hydration, Dynamics, and Numerical Evidence of Self-Assembly in Dimers. ACS OMEGA 2020; 5:25423-25431. [PMID: 33043222 PMCID: PMC7542832 DOI: 10.1021/acsomega.0c03852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Accepted: 09/10/2020] [Indexed: 06/11/2023]
Abstract
Recently, self-organization of the cyclic octapeptide lanreotide and lanreotide-based derivatives in a nanotube to from a dimer structure has been experimentally evidenced. While the nature of the interactions between both monomers has been strongly investigated no molecular details of the hydration of the monomer and the formation of the dimer have been provided. Using molecular dynamics simulations, this work focuses on the structure, hydration, and dynamics of water and an analog of lanreotide. To do so, several models of monomers based on different schemes of partial charges and electrostatic interaction calculations are considered. By comparison with the experiments, we show that the model based on the combination of the AMBER force-field, CHELPG charge calculation, Ewald sum is the most relevant. Additionally, by mapping the interfacial hydration of the lanreotide monomer we evidence a heterogeneous surface in terms of hydrophilicity involving heterogeneous hydration. Furthermore, we show a slowdown in the translational dynamics of water molecules located close to the lanreotide surface. We also provide the molecular details of the self-assembly in the dimer in terms of structure, hydration, and energy.
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Chacón KN, Espinal JF, Montero-Campillo MM, Yáñez M, Mejía SM. Looking for the Azeotrope: A Computational Study of (Ethanol) 6-Water, (Methanol) 6-Water, (Ethanol) 7, and (Methanol) 7 Heptamers. J Phys Chem A 2020; 124:7080-7087. [PMID: 32786982 DOI: 10.1021/acs.jpca.0c05362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Considering that a molecular-level understanding of the azeotropic ethanol-water system can contribute to the search of new methodologies and/or modifications of industrial separation methods, this study tries to provide some clues to understand why azeotropes should be expected for ethanol, but not for methanol. Our exploration of the potential energy surface of (ethanol)6-water heteroheptamers, carried out at the B3LYP-D3/6-311++G(d,p) level, shows these heteroclusters to exhibit a cyclic structure where the cooperativity effects between the OH···O HBs is a fundamental ingredient. An analysis of this cooperativity clearly indicates that ethanol-water systems will exhibit a similarly high stability as the heterocluster size approaches the azeotrope. However, a similar behavior should not be expected for the methanol-containing analogues. A comparison between (ethanol)7, (ethanol)6-water, (methanol)7, and (methanol)6-water shows the ethanol-containing systems to be significantly more stable than the methanol-containing analogues. This result is probably due to the fact that the OH···O HBs are weaker than those found between ethanol molecules. However, our atoms in molecule (AIM) and noncovalent interaction (NCI) analyses unambiguously show that important contributors to the enhanced stability of the ethanol-containing clusters are the secondary van der Waals interactions between ethyl groups, which are not observed between methyl groups. Hence, while the formation of stable azeotropes is expected for the case of ethanol, for the methanol-containing analogues, the relative stability of the clusters is significantly smaller, and its formation is accompanied by an increase of the free energy.
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Affiliation(s)
- Kevin N Chacón
- Línea de Investigación en Química Computacional, Grupo de Investigación GIFUJ, Departamento de Química, Facultad de Ciencias, Pontificia Universidad Javeriana, 110231 Bogotá, Colombia
| | - Juan F Espinal
- Química de Recursos Energéticos y MedioAmbiente, Instituto de Química, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, 050010 Medellín, Colombia
| | - M Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute of Advanced Chemical Sciences (IadChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute of Advanced Chemical Sciences (IadChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain
| | - Sol M Mejía
- Línea de Investigación en Química Computacional, Grupo de Investigación GIFUJ, Departamento de Química, Facultad de Ciencias, Pontificia Universidad Javeriana, 110231 Bogotá, Colombia
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Li YY, Wang M, Wang CC, Zhang QW, Yi HB. Distinctive hydration dynamics around highly coordinated Cu2+/Zn2+-chloride complexes: A molecular dynamics simulation study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113619] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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34
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Sinha S, Gharat PM, Pal H, Dutta Choudhury S. Lumichrome tautomerism in alcohol-water mixtures: Effect of carbon chain length and mole fraction of alcohols. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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Choi S, Parameswaran S, Choi JH. Understanding alcohol aggregates and the water hydrogen bond network towards miscibility in alcohol solutions: graph theoretical analysis. Phys Chem Chem Phys 2020; 22:17181-17195. [PMID: 32677643 DOI: 10.1039/d0cp01991g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Under ambient conditions, methanol and ethanol are miscible in water at all concentrations, while n-butanol is partially miscible. This is the first study to quantitatively examine the miscibility of butanol and compare with miscible alcohols by employing molecular dynamics simulations and graph theoretical analysis of three water-alcohol mixtures at various concentrations. We show how distinct alcohol aggregates are formed, thereby affecting the water structure, which established the relationship between the morphological structure of the aggregates and the miscibility of the alcohol in aqueous solution. The aggregates of methanol and ethanol in highly concentrated solutions form an extended H-bond network that intertwines well with the H-bond network of water. n-Butanol tends to self-associate and form large aggregates, while such aggregates are segregated from water. Graph theoretical analysis revealed that the alcohol aggregates of methanol and ethanol solutions have a morphological structure different from that of n-butanol, although there is no significant difference in morphology between the three pure alcohols. These two distinct alcohol aggregates are classified as water-compatible and water-incompatible depending upon their interaction with the water H-bond network, and their effect on the water structure was investigated. Our study reveals that the water-compatible network of alcohol aggregates in methanol and ethanol solutions disrupts the water H-bond networks, while the water-incompatible network of n-butanol aggregates does not considerably alter the water structure, which is consistent with the experimental results. Furthermore, we propose that miscible alcohols form water-compatible networks in binary aqueous systems while partially miscible alcohols form water-incompatible networks. The bifurcating hypothesis on the alcohol aggregation behavior in liquid water is of critical use to understand the fundamental issues such as solubility and phase separation in solution systems.
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Affiliation(s)
- Seungeui Choi
- Department of Chemistry, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
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36
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Nair AS, Kumar S, Acharya S, Bagchi B. Rotation of small diatomics in water–ethanol mixture: Multiple breakdowns of hydrodynamic predictions. J Chem Phys 2020; 153:014504. [DOI: 10.1063/5.0005160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anjali S. Nair
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Shubham Kumar
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Subhajit Acharya
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Biman Bagchi
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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37
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Yamaoka S, Hyeon-Deuk K. Decelerated Liquid Dynamics Induced by Component-Dependent Supercooling in Hydrogen and Deuterium Quantum Mixtures. J Phys Chem Lett 2020; 11:4186-4192. [PMID: 32375000 DOI: 10.1021/acs.jpclett.0c00801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Isotopic mixtures of p-H2 and o-D2 molecules have been an attractive binary system because they include two kinds of purely isotopic molecules which possess the same electronic potential but the twice different mass inducing differently pronounced nuclear quantum effects (NQEs). Accessing details of structures and dynamics in such quantum mixtures combining complex molecular dynamics with NQEs of different strengths remains a challenging problem. Taking advantage of the nonempirical molecular dynamics method which describes p-H2 and o-D2 molecules, we found that the liquid dynamics slows down at a specific mixing ratio, which can be connected to the observed anomalous slowdown of crystallization in the quantum mixtures. We attributed the decelerated dynamics to the component-dependent supercooling of p-H2 taking place in the mixtures, demonstrating that there is an optimal mixing ratio to hinder crystallization. The obtained physical insights will help in experimentally controlling and achieving unknown quantum mixtures including superfluid.
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Affiliation(s)
- Shutaro Yamaoka
- Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
| | - Kim Hyeon-Deuk
- Department of Chemistry, Kyoto University, Kyoto 606-8502, Japan
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38
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Chua R, Cai Y, Lim PQ, Kumar S, Satish R, Manalastas W, Ren H, Verma V, Meng S, Morris SA, Kidkhunthod P, Bai J, Srinivasan M. Hydrogen-Bonding Interactions in Hybrid Aqueous/Nonaqueous Electrolytes Enable Low-Cost and Long-Lifespan Sodium-Ion Storage. ACS APPLIED MATERIALS & INTERFACES 2020; 12:22862-22872. [PMID: 32343545 DOI: 10.1021/acsami.0c03423] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Although "water-in-salt" electrolytes have opened a new pathway to expand the electrochemical stability window of aqueous electrolytes, the electrode instability and irreversible proton co-insertion caused by aqueous media still hinder the practical application, even when using exotic fluorinated salts. In this study, an accessible hybrid electrolyte class based on common sodium salts is proposed, and crucially an ethanol-rich media is introduced to achieve highly stable Na-ion electrochemistry. Here, ethanol exerts a strong hydrogen-bonding effect on water, simultaneously expanding the electrochemical stability window of the hybridized electrolyte to 2.5 V, restricting degradation activities, reducing transition metal dissolution from the cathode material, and improving electrolyte-electrode wettability. The binary ethanol-water solvent enables the impressive cycling of sodium-ion batteries based on perchlorate, chloride, and acetate electrolyte salts. Notably, a Na0.44MnO2 electrode exhibits both high capacity (81 mAh g-1) and a remarkably long cycle life >1000 cycles at 100 mA g-1 (a capacity decay rate per cycle of 0.024%) in a 1 M sodium acetate system. The Na0.44MnO2/Zn full cells also show excellent cycling stability and rate capability in a wide temperature range. The gained understanding of the hydrogen-bonding interactions in the hybridized electrolyte can provide new battery chemistry guidelines in designing promising candidates for developing low-cost and long-lifespan batteries based on other (Li+, K+, Zn2+, Mg2+, and Al3+) systems.
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Affiliation(s)
- Rodney Chua
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Yi Cai
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Pei Qi Lim
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Sonal Kumar
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Rohit Satish
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - William Manalastas
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Hao Ren
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Vivek Verma
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Shize Meng
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Samuel A Morris
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
| | - Pinit Kidkhunthod
- Synchrotron Light Research Institute (Public Organization), Muang, Nakhon Ratchasima 30000, Thailand
| | - Jianming Bai
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Madhavi Srinivasan
- School of Materials Science and Engineering, Nanyang Technological University, 11 Faculty Ave., Singapore 639977, Singapore
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39
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Kumar S, Sarkar S, Bagchi B. Microscopic origin of breakdown of Stokes-Einstein relation in binary mixtures: Inherent structure analysis. J Chem Phys 2020; 152:164507. [PMID: 32357772 DOI: 10.1063/5.0004725] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Aqueous binary mixtures often exhibit dramatic departure from the predicted hydrodynamic behavior when transport properties are plotted against composition. We show by inherent structure (IS) analysis that this sharp composition dependent breakdown of the Stokes-Einstein relation can be attributed to the non-monotonic variation in the average inherent structure energy of these mixtures. Further IS analysis reveals the existence of a unique ground state, stabilized by both the formation of an optimum number of H-bonds and a favorable hydrophobic interaction at this composition. The surprisingly sharp turnaround behavior observed in the effective hydrodynamic radius also owes its origin to the same combination of these two factors. Interestingly, the temperature dependence of isothermal compressibility shows a minimum at the particular composition. Extensive studies on water-dimethyl sulfoxide and water-ethanol mixtures using two different force-fields of water reveal many features that are nearly universal. A justification of this quasi-universal behavior is provided in terms of a mode-coupling theory (MCT) of viscosity, which can serve as the starting point of a remarkable correlation observed with the nearest neighbor structure, as captured by the first peaks of the radial distribution function, and the slowdown in the intermediate scattering function at intermediate wavenumbers. Therefore, the formation of the local structure captured through IS analysis can be correlated with the MCT.
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Affiliation(s)
- Shubham Kumar
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Sarmistha Sarkar
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Biman Bagchi
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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40
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Li D, Gao Z, Vasudevan NK, Li H, Gao X, Li X, Xi L. Molecular Mechanism for Azeotrope Formation in Ethanol/Benzene Binary Mixtures through Gibbs Ensemble Monte Carlo Simulation. J Phys Chem B 2020; 124:3371-3386. [PMID: 32250637 DOI: 10.1021/acs.jpcb.9b12013] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Azeotropes have been studied for decades due to the challenges they impose on separation processes but fundamental understanding at the molecular level remains limited. Although molecular simulation has demonstrated its capability of predicting mixture vapor-liquid equilibrium (VLE) behaviors, including azeotropes, its potential for mechanistic investigation has not been fully exploited. In this study, we use the united atom transferable potentials for phase equilibria (TraPPE-UA) force field to model the ethanol/benzene mixture, which displays a positive azeotrope. Gibbs ensemble Monte Carlo (GEMC) simulation is performed to predict the VLE phase diagram, including an azeotrope point. The results accurately agree with experimental measurements. We argue that the molecular mechanism of azeotrope formation cannot be fully understood by studying the mixture liquid-state stability at the azeotrope point alone. Rather, azeotrope occurrence is only a reflection of the changing relative volatility between the two components over a much wider composition range. A thermodynamic criterion is thus proposed on the basis of the comparison of partial excess Gibbs energy between the components. In the ethanol/benzene system, molecular energetics shows that with increasing ethanol mole fraction, its volatility initially decreases but later plateaus, while benzene volatility is initially nearly constant and only starts to decrease when its mole fraction is low. Analysis of the mixture liquid structure, including a detailed investigation of ethanol hydrogen-bonding configurations at different composition levels, reveals the underlying molecular mechanism for the changing volatilities responsible for the azeotrope.
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Affiliation(s)
- Dongyang Li
- School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China.,Department of Chemical Engineering, McMaster Universtiy, Hamilton, Ontario L8S 4L7, Canada
| | - Ziqi Gao
- Department of Chemical Engineering, McMaster Universtiy, Hamilton, Ontario L8S 4L7, Canada
| | - Naveen Kumar Vasudevan
- Department of Chemical Engineering, McMaster Universtiy, Hamilton, Ontario L8S 4L7, Canada
| | - Hong Li
- School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Xin Gao
- School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Xingang Li
- School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China
| | - Li Xi
- Department of Chemical Engineering, McMaster Universtiy, Hamilton, Ontario L8S 4L7, Canada
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41
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Foster W, Miyazawa K, Fukuma T, Kusumaatmaja H, Voϊtchovsky K. Self-assembly of small molecules at hydrophobic interfaces using group effect. NANOSCALE 2020; 12:5452-5463. [PMID: 32080696 DOI: 10.1039/c9nr09505e] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Although common in nature, the self-assembly of small molecules at sold-liquid interfaces is difficult to control in artificial systems. The high mobility of dissolved small molecules limits their residence at the interface, typically restricting the self-assembly to systems under confinement or with mobile tethers between the molecules and the surface. Small hydrogen-bonding molecules can overcome these issues by exploiting group-effect stabilization to achieve non-tethered self-assembly at hydrophobic interfaces. Significantly, the weak molecular interactions with the solid makes it possible to influence the interfacial hydrogen bond network, potentially creating a wide variety of supramolecular structures. Here we investigate the nanoscale details of water and alcohols mixtures self-assembling at the interface with graphite through group-effect. We explore the interplay between inter-molecular and surface interactions by adding small amounts of foreign molecules able to interfere with the hydrogen bond network and systematically varying the length of the alcohol hydrocarbon chain. The resulting supramolecular structures forming at room temperature are then examined using atomic force microscopy with insights from computer simulations. We show that the group-based self-assembly approach investigated here is general and can be reproduced on other substrates such as molybdenum disulphide and graphene oxide, potentially making it relevant for a wide variety of systems.
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Affiliation(s)
- William Foster
- Durham University, Physics Department, Durham DH1 3LE, UK.
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42
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Pinzan F, Artzner F, Ghoufi A. Anomalous dynamics of water at the octopeptide lanreotide surface. RSC Adv 2020; 10:33903-33910. [PMID: 35519054 PMCID: PMC9056749 DOI: 10.1039/d0ra06237e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 08/25/2020] [Indexed: 11/21/2022] Open
Abstract
This work reports the study of water dynamics close to the cyclic octapeptide lanreotide from atomistic simulations of hydrated lanreotide, a cyclic octapeptide. Calculation of the hydrogen bonds between water molecules allows mapping of the hydrophilic regions of lanreotide. Whereas a super-diffusivity of the interfacial water molecules is established, a slowdown in rotational dynamics is observed, involving a decoupling between both processes. Acceleration in translation dynamics is connected to the hopping process between hydrophilic zones. Microscopically, this is correlated with the weakness of the interfacial hydrogen bonding network due to a hydrophobic interface at the origin of the interfacial sliding of water molecules. Heterogeneous rotational dynamics of water molecules close the lanreotide surface is evidenced and connected to heterogeneous hydration. Molecular dynamics simulations of a hydrated mutated lanreotide, a cyclic octapeptide, were carried out to characterize its hydration state. We studied the water dynamics close to the peptide using atomistic simulations.![]()
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Affiliation(s)
- Florian Pinzan
- Institut de Physique de Rennes
- UMR CNRS 6251
- Université Rennes 1
- 35042 Rennes
- France
| | - Franck Artzner
- Institut de Physique de Rennes
- UMR CNRS 6251
- Université Rennes 1
- 35042 Rennes
- France
| | - Aziz Ghoufi
- Institut de Physique de Rennes
- UMR CNRS 6251
- Université Rennes 1
- 35042 Rennes
- France
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43
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Hu Y, Toth RT, Joshi SB, Esfandiary R, Middaugh CR, Volkin DB, Weis DD. Characterization of Excipient Effects on Reversible Self-Association, Backbone Flexibility, and Solution Properties of an IgG1 Monoclonal Antibody at High Concentrations: Part 2. J Pharm Sci 2020; 109:353-363. [DOI: 10.1016/j.xphs.2019.06.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/13/2019] [Accepted: 06/04/2019] [Indexed: 12/17/2022]
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Abstract
Based on the molecular dynamics method, the calculations for diffusion coefficients were carried out in binary aqueous solutions of three alcohols: ethanol, isopropanol, and tert-butanol. The intermolecular potential TIP4P/2005 was used for water; and five force fields were analyzed for the alcohols. The force fields providing the best accuracy of calculation were identified based on a comparison of the calculated self-diffusion coefficients of pure alcohols with the experimental data for internal (Einstein) diffusion coefficients of alcohols in solutions. The temperature and concentration dependences of the interdiffusion coefficients were determined using Darken’s Equation. Transport (Fickian) diffusion coefficients were calculated using a thermodynamic factor determined by the non-random two-liquid (NRTL) and Willson models. It was demonstrated that for adequate reproduction of the experimental data when calculating the transport diffusion coefficients, the thermodynamic factor has to be 0.64. Simple approximations were obtained, providing satisfactory accuracy in calculating the concentration and temperature dependences of the transport diffusion coefficients in the studied mixtures.
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45
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Exploring hydrogen bonds network behavior of ethanol-water systems on stimulated Raman scattering. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111705] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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46
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Essafri I, Ghoufi A. Microstructure of nonideal methanol binary liquid mixtures. Phys Rev E 2019; 99:062607. [PMID: 31330689 DOI: 10.1103/physreve.99.062607] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Indexed: 11/07/2022]
Abstract
The nonideality of binary mixtures is often related to the nature of the interactions between both liquids and of the heterogeneity at the nanoscale-named microstructure. When one of the liquids is a hydrogen bonds former and the second is aprotic, the progressive diluting of the hydrogen-bonding network leads to a clustering and nanophases. By considering two mixtures, toluene-methanol and cyclohexane-methanol, the nonideality and its connection with the structure at the nanoscale and the intermolecular interactions are numerically investigated. Contrary to the toluene that is fully miscible in methanol, cyclohexane presents a high range of immiscibility which makes it a relevant system to study the nucleation (local segregation) and its propagation. In both mixtures, the deviation from the ideal behavior is observed. In the case of the toluene-methanol mixture, the initial hydrogen-bonding network corresponding to a homogenous structure is locally broken due to the favorable toluene-methanol interactions leading to the spatial heterogeneity at the origin of the nonideality. In the range of miscibility of the cyclohexane-methanol mixtures, the formation of hydrophobic nanophases of larger size is observed due to the unfavorable interactions between both components leading to a self-organizing of cyclohexane molecules. The immiscibility of cyclohexane and methanol are then correlated to the formation of nanophases and their propagation, which are also at the origin of the spatial heterogeneity. In the pure methanol, we highlight the disconnection between the clustering and the heterogeneity. We shed light on the fact that the prepeak observed in the structure factor is independent of the degree of heterogeneity, but is connected to the presence of cyclic clusters.
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Affiliation(s)
- I Essafri
- Institut de Physique de Rennes, UMR 6251 CNRS, Université de Rennes, 263 avenue Général Leclerc, 35042 Rennes, France
| | - A Ghoufi
- Institut de Physique de Rennes, UMR 6251 CNRS, Université de Rennes, 263 avenue Général Leclerc, 35042 Rennes, France
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47
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Mozaffari F, Zeraatgar M. Molecular Dynamics Simulation of Nanoconfined Ethanol–Water Mixtures. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Farkhondeh Mozaffari
- Department of Chemistry, College of Sciences, Persian Gulf University, Bushehr 75168, Iran
| | - Mina Zeraatgar
- Department of Chemistry, College of Sciences, Persian Gulf University, Bushehr 75168, Iran
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48
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Shin Y, Taufique MFN, Devanathan R, Cutsforth EC, Lee J, Liu W, Fifield LS, Gotthold DW. Highly Selective Supported Graphene Oxide Membranes for Water-Ethanol Separation. Sci Rep 2019; 9:2251. [PMID: 30783125 PMCID: PMC6381104 DOI: 10.1038/s41598-019-38485-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 11/20/2018] [Indexed: 11/09/2022] Open
Abstract
A polyethersulfone (PES)-supported graphene oxide (GO) membrane has been developed by a simple casting approach. This stable membrane is applied for ethanol/water separation at different temperatures. The 5.0 µm thick GO film coated on PES support membrane showed a long-term stability over a testing period of one month and excellent water/ethanol selectivity at elevated temperatures. The water/ethanol selectivity is dependent on ethanol weight percentage in water/ethanol feed mixtures and on operating temperature. The water/ethanol selectivity was enhanced with an increase of ethanol weight percentage in water/ethanol mixtures, from below 100 at RT to close to 874 at a 90 °C for 90% ethanol/10% water mixture. Molecular dynamics simulation of water-ethanol mixtures in graphene bilayers, that are considered to play a key role in transport, revealed that molecular transport is negligible for layer spacing below 1 nm. The differences in the diffusion of ethanol and water in the bilayer are not consistent with the large selectivity value experimentally observed. The entry of water and ethanol into the interlayer space may be the crucial step controlling the selectivity.
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Affiliation(s)
- Yongsoon Shin
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Mohammad Fuad Nur Taufique
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Ram Devanathan
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Erika C Cutsforth
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Jaewon Lee
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Wei Liu
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - Leonard S Fifield
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States
| | - David W Gotthold
- Pacific Northwest National Laboratory, 902 Battelle Blvd, P.O.Box 999, Richland, Washington, 99352, United States.
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49
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Furukawa K, Kuronuma S, Judai K. Water fluctuation in methanol, ethanol, and 1-propanol aqueous-mixture probed by Brownian motion. J Chem Phys 2018; 149:244505. [PMID: 30599750 DOI: 10.1063/1.5064750] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The origin of the driving force in Brownian motion is the collision between the colloidal particle and the molecules of the surrounding fluid. Therefore, Brownian motion contains information on the local solvent structures of the surrounding colloid. The mean square displacement in a water-ethanol mixture is greater than that anticipated from the macroscopic shear viscosity, indicating that the microscopic movement of Brownian motion involves the local information on the water-ethanol mixture on a molecular level, i.e., an inhomogeneity in the Brownian particle size (∼1 μm). Here, the Brownian motion of mixtures of water and methanol, ethanol, and 1-propanol are systematically investigated. Similar discrepancies between the microscopic and macroscopic viscosities are observed at low alcohol molar concentrations, for all the alcohol mixtures. This means that inhomogeneity with water fluctuation is important in explanation of the unusual Brownian diffusions of alcohol aqueous solutions. The Brownian motion also reveals a thermal energy conversion mechanism between translation and rotation.
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Affiliation(s)
- Kazuki Furukawa
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
| | - Sumito Kuronuma
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
| | - Ken Judai
- Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550, Japan
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50
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