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Srinivasan H, Sharma VK, García Sakai V, Mitra S. Nature of Subdiffusion Crossover in Molecular and Polymeric Glassformers. PHYSICAL REVIEW LETTERS 2024; 132:058202. [PMID: 38364148 DOI: 10.1103/physrevlett.132.058202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 11/21/2023] [Accepted: 01/03/2024] [Indexed: 02/18/2024]
Abstract
A crossover from a non-Gaussian to Gaussian subdiffusion has been observed ubiquitously in various polymeric and molecular glassformers. We have developed a framework that generalizes the fractional Brownian motion model to incorporate non-Gaussian features by introducing a jump kernel. We illustrate that the non-Gaussian fractional Brownian motion model accurately characterizes the subdiffusion crossover. From the solutions of the non-Gaussian fractional Brownian motion model, we gain insights into the nature of van Hove self-correlation in non-Gaussian subdiffusive regime, which is found to exhibit exponential tails, providing first such experimental evidence in molecular glassformers. The validity of the model is supported by comparison with incoherent quasielastic neutron scattering data obtained from several molecular and polymeric glassformers.
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Affiliation(s)
- H Srinivasan
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - V K Sharma
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - V García Sakai
- ISIS Neutron and Muon Centre, Rutherford Appleton Laboratory, Didcot, United Kingdom
| | - S Mitra
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
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2
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Rana R, Ali SM, Maity DK. Structure and dynamics of the Li + ion in water, methanol and acetonitrile solvents: ab initio molecular dynamics simulations. Phys Chem Chem Phys 2023; 25:31382-31395. [PMID: 37961866 DOI: 10.1039/d3cp04403c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Fundamental understanding of the structure and dynamics of the Li+ ion in solution is of utmost importance in different fields of science and technology, especially in the field of ion batteries. In view of this, ab initio molecular dynamics (AIMD) simulations of the LiCl salt in water, methanol and acetonitrile were performed to elucidate structural parameters such as radial distribution function and coordination number, and dynamical properties like diffusion coefficient, limiting ion conductivity and hydrogen bond correlation function. In the present AIMD simulation, one LiCl in water is equivalent to 0.8 M, which is close to the concentration of the lithium salt used in the Li-ion battery. The first sphere of coordination number of the Li+ ion was reaffirmed to be 4. The radial distribution function for different pairs of atoms is seen to be in good agreement with the experimental results. The calculated potential of mean force indicates the stronger interaction of the Li+ ion with methanol over water followed by acetonitrile. The dynamical parameters convey quite high diffusion and limiting ionic conductivity of the Li+ ion in acetonitrile compared to that in water and methanol which has been attributed to the transport of the Li-Cl ion pair in a non-dissociated form in acetonitrile. The AIMD results were found to be in accordance with the experimental findings, i.e. the limiting ion conductivity was found to follow the order acetonitrile > methanol > water. This study shows the importance of atomistic level simulations in evaluating the structural and dynamical parameters and in implementing the results for predicting and synthesizing better next generation solvents for lithium ion batteries (LIBs).
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Affiliation(s)
- Reman Rana
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
| | - Sk Musharaf Ali
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
- Chemical Engineering Division, Bhabha Atomic Research Centre, Mumbai-400085, India
| | - Dilip K Maity
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
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3
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Sun K, Nguyen CV, Nguyen NN, Nguyen AV. Flotation surface chemistry of water-soluble salt minerals: from experimental results to new perspectives. Adv Colloid Interface Sci 2022; 309:102775. [PMID: 36152375 DOI: 10.1016/j.cis.2022.102775] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 09/12/2022] [Accepted: 09/12/2022] [Indexed: 11/18/2022]
Abstract
The flotation separation of water-soluble salt minerals has to be conducted under the condition of saturation in brines which represents a challenging but exciting topic of colloid and surface chemistry. Despite several proposals on explaining the success of this industrial application for many decades, our understanding of the flotation separation is still far from complete yet, owing to the complexity of the highly selective collection of salt crystals by air bubbles in brines. Here, we thoroughly review the experimental results for halogen, oxyanion, and double salts and match them with the proposed theories on the flotation of soluble salts to identify the agreed and disagreed cases. The experimental results show that the flotation of these salts varies from collectors (surfactants applied to control the crystal hydrophobicity) to collectors and is strongly affected by the brine ion composition and pH conditions. We find some exceptional flotation results that cannot be simply explained by the crystal surface charge and wettability. Furthermore, we outline several disputes and discrepancies between the experiments and the theories when different collectors are applied. Apart from the extensive consideration of surface hydration, the presence of external ion species exhibits ubiquitous effects on the surface properties of salt crystals and the colloidal properties of collectors. We conclude that the interactions between salt ions, water molecules, collectors, and salt crystals must be considered more thoroughly, and the activity of collectors at the air-liquid interface should also be the focus. Advanced techniques such as molecular dynamics simulation, atomic force microscopy, X-ray photoelectron spectroscopy, and sum-frequency generation spectroscopy are expected to be promising research tools for future studies.
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Affiliation(s)
- Kangkang Sun
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Cuong V Nguyen
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Ngoc N Nguyen
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Anh V Nguyen
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia.
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4
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Orekhov M. Effect of divalent ion coordination on ion diffusion in organic liquids. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Wei Y, Wang Y, Wang L, Yang H, Jin H, Lu P, Li Y. Simultaneous phase-inversion and crosslinking in organic coagulation bath to prepare organic solvent forward osmosis membranes. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118829] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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6
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Wu Y, Li J, Jin Y, Zhou M. Binary solvent systems for durable self-adhesive conductive hydrogels. JOURNAL OF POLYMER ENGINEERING 2020. [DOI: 10.1515/polyeng-2019-0304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractConductive hydrogels without adhesiveness and durability characteristics face great challenges in practical applications, such as inconvenient use, unstable contact voltage, and difficult to store. Herein, we present sodium polyacrylate (PAANa) hydrogels with binary solvent systems composed of water and an alcohol [ethylene glycol (EG), glycerol (GLY), or poly(ethylene glycol) (PEG)] as solvent instead of traditional water to research their self-adhesiveness, durability, conductivity, and mechanical properties. PAANa hydrogels exhibited higher self-adhesive properties and durability after alcohol content increased, and GLY/water hydrogels showed the best self-adhesive and stable properties. With more alcohols added, the weaker conductivity became, and EG/water hydrogels showed the highest conductivity. It was observed the long carbon chain length of alcohol could help improve the rheological properties of hydrogels. Thus, PEG/water hydrogels had the highest storage modulus, loss modulus, and consistency. The results demonstrated that the GLY/water binary solvent could provide good self-adhesiveness and durability, but EG/water and PEG/water showed better conductivity and mechanical properties, respectively. Therefore, our work may provide novel physical insights into the long-term usage of self-adhesive conductive hydrogels to practical requirements.
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Affiliation(s)
- Yunxuan Wu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Jie Li
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Yangfu Jin
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Mi Zhou
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, P.R. China
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Acharya S, Nandi UK, Bhattacharyya SM. Comparative Study of Anomalous Size Dependence of Charged and Neutral Solute Diffusion in Water. J Phys Chem B 2019; 123:10275-10285. [PMID: 31697084 DOI: 10.1021/acs.jpcb.9b08023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present a comparative study of size dependence of diffusion for charged and neutral solutes in water. Although both show nonmonotonicity of the size dependence of diffusion, their nature and origin are quite different. For neutral solutes, the peak position and the value of diffusion at the maximum are both independent of the solute-water interaction. Interestingly, for charged solutes, with an increase in solute-water interaction strength, the peak position shifts to lower solute sizes and with an increase in charge, it shifts to higher solute sizes. The diffusion value at the peak reduces with an increase in both solute-water interaction and solute charge. We show that all these features observed for charged solutes can be understood in terms of the interplay between ionic and nonionic interactions which is definitely absent for neutral solutes. Some of the earlier studies addressing the nonmonotonicity in diffusion did suggest the interplay between the two interactions to be the cause. However, this is the first time we show that such an interplay gives rise to the nonmonotonicity in the potential energy which is a prerequisite for obtaining the nonmonotonicity in the diffusion. Such nonmonotonicity in the potential energy is absent for neutral solutes.
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Affiliation(s)
- Sayantan Acharya
- Polymer Science and Engineering Department , National Chemical Laboratory , Pune 411008 , India.,Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
| | - Ujjwal K Nandi
- Polymer Science and Engineering Department , National Chemical Laboratory , Pune 411008 , India.,Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
| | - Sarika Maitra Bhattacharyya
- Polymer Science and Engineering Department , National Chemical Laboratory , Pune 411008 , India.,Academy of Scientific and Innovative Research (AcSIR) , Ghaziabad 201002 , India
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Kumar P, Yashonath S. Ionic conductivity in aqueous electrolyte solutions: Insights from computer simulations. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.090] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Matsuyama H, Motoyoshi K. An empirical relation between the limiting ionic molar conductivities and self-diffusion coefficients of pure solvents. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.03.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Li RZ, Liu YY, Yang M. Microsolvation of lithium iodide dimer studied by ab initio calculations. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.06.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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A comparison of classical interatomic potentials applied to highly concentrated aqueous lithium chloride solutions. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.07.076] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Kiefer R, Kesküla A, Martinez JG, Anbarjafari G, Torop J, Otero TF. Interpenetrated triple polymeric layer as electrochemomechanical actuator: Solvent influence and diffusion coefficient of counterions. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.01.191] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Abstract
The diffusivity of ions in liquid solutions is known either to decrease with an increase in the ion size or to have a single maximum depending on the ion size. This article presents evidence for the appearance of multiple maxima and thus multiple ion sizes with enhanced diffusivity.
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Affiliation(s)
- Maksim A. Orekhov
- Moscow Institute of Physics and Technology (State University)
- Dolgoprudny
- Russia
- National Research University Higher School of Economics (NRU HSE)
- Moscow
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14
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Banerjee P, Yashonath S, Bagchi B. Coupled jump rotational dynamics in aqueous nitrate solutions. J Chem Phys 2016; 145:234502. [DOI: 10.1063/1.4971864] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Affiliation(s)
- Puja Banerjee
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Subramanian Yashonath
- 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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15
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Zong D, Hu H, Duan Y, Sun Y. Viscosity of Water under Electric Field: Anisotropy Induced by Redistribution of Hydrogen Bonds. J Phys Chem B 2016; 120:4818-27. [DOI: 10.1021/acs.jpcb.6b01686] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Diyuan Zong
- Department
of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - Han Hu
- Department
of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Yuanyuan Duan
- Department
of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - Ying Sun
- Department
of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
- Department
of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania 19104, United States
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16
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Kumar P, Bharadwaj MD, Yashonath S. Effect of interionic interactions on the structure and dynamics of ionic solvation shells in aqueous electrolyte solutions. RSC Adv 2016. [DOI: 10.1039/c6ra26819f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Molecular dynamics (MD) simulations to explore the structure and dynamics of the ionic solvation shell of alkali ions and halide ions in aqueous solution.
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Affiliation(s)
- Parveen Kumar
- Center for Study of Science, Technology and Policy
- Bangalore-560094
- India
| | | | - S. Yashonath
- Solid Sate and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore-560012
- India
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17
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Kumar P, Kulkarni AD, Yashonath S. Influence of a Counterion on the Ion Atmosphere of an Anion: A Molecular Dynamics Study of LiX and CsX (X = F–, Cl–, I–) in Methanol. J Phys Chem B 2015; 119:10921-33. [DOI: 10.1021/acs.jpcb.5b00481] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Parveen Kumar
- Solid
State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Anant D. Kulkarni
- Centre
for Computational Materials Science, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - S. Yashonath
- Solid
State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
- Center
for Condensed Matter Theory, Indian Institute of Science, Bangalore 560012, India
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18
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Shaulsky E, Boo C, Lin S, Elimelech M. Membrane-based osmotic heat engine with organic solvent for enhanced power generation from low-grade heat. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:5820-5827. [PMID: 25839239 DOI: 10.1021/es506347j] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a hybrid osmotic heat engine (OHE) system that uses draw solutions with an organic solvent for enhanced thermal separation efficiency. The hybrid OHE system produces sustainable energy by combining pressure-retarded osmosis (PRO) as a power generation stage and membrane distillation (MD) utilizing low-grade heat as a separation stage. While previous OHE systems employed aqueous electrolyte draw solutions, using methanol as a solvent is advantageous because methanol is highly volatile and has a lower heat capacity and enthalpy of vaporization than water. Hence, the thermal separation efficiency of a draw solution with methanol would be higher than that of an aqueous draw solution. In this study, we evaluated the performance of LiCl-methanol as a potential draw solution for a PRO-MD hybrid OHE system. The membrane transport properties as well as performance with LiCl-methanol draw solution were evaluated using thin-film composite (TFC) PRO membranes and compared to the results obtained with a LiCl-water draw solution. Experimental PRO methanol flux and maximum projected power density of 47.1 L m(-2) h(-1) and 72.1 W m(-2), respectively, were achieved with a 3 M LiCl-methanol draw solution. The overall efficiency of the hybrid OHE system was modeled by coupling the mass and energy flows between the thermal separation (MD) and power generation (PRO) stages under conditions with and without heat recovery. The modeling results demonstrate higher OHE energy efficiency with the LiCl-methanol draw solution compared to that with the LiCl-water draw solution under practical operating conditions (i.e., heat recovery<90%). We discuss the implications of the results for converting low-grade heat to power.
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Affiliation(s)
- Evyatar Shaulsky
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, United States
| | - Chanhee Boo
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, United States
| | - Shihong Lin
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, United States
| | - Menachem Elimelech
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, United States
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20
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Kann ZR, Skinner JL. A scaled-ionic-charge simulation model that reproduces enhanced and suppressed water diffusion in aqueous salt solutions. J Chem Phys 2014; 141:104507. [DOI: 10.1063/1.4894500] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Affiliation(s)
- Z. R. Kann
- Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, USA
| | - J. L. Skinner
- Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, USA
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