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Jing Z, Zhou Y, Yamaguchi T, Yoshida K, Ikeda K, Ohara K, Wang G. Hydration of Alkali Metal and Halide Ions from Static and Dynamic Viewpoints. J Phys Chem Lett 2023:6270-6277. [PMID: 37399074 DOI: 10.1021/acs.jpclett.3c01302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
Ion hydration in aqueous solutions plays a paramount role in many fields. Despite many studies on ion hydration, the nature of ion hydration is not consistently understood at the molecular level. Combining neutron scattering (NS), wide-angle X-ray scattering (WAXS), and molecular dynamics (MD), we quantify the ionic hydration degree (hydration ability) systematically for a series of alkali metal and halide ions based on static and dynamic hydration numbers. The former is based on the orientational correlation of water molecules bound to an ion derived from the positional information from NS and WAXS. The latter is defined as the mean number of water molecules remaining in the first coordination shell of an ion over a residence time of bound water molecules around the ion from MD. The static and dynamic hydration numbers distinguish hydration from coordination and quantify the ionic hydration degree, which provides a valuable reference for understanding various phenomena in nature.
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Affiliation(s)
- Zhuanfang Jing
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yongquan Zhou
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
| | - Toshio Yamaguchi
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
| | - Koji Yoshida
- Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan, Fukuoka 814-0180, Japan
| | - Kazutaka Ikeda
- High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Koji Ohara
- Diffraction and Scattering Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Guangguo Wang
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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2
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Chai K, Lu X, Zhou Y, Liu H, Wang G, Jing Z, Zhu F, Han L. Hydrogen bonds in aqueous choline chloride solutions by DFT calculations and X-ray scattering. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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3
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Liu H, Zhou Y, An D, Wang G, Zhu F, Yamaguchi T. Structure of Aqueous KNO 3 Solutions by Wide-Angle X-ray Scattering and Density Functional Theory. J Phys Chem B 2022; 126:5866-5875. [PMID: 35895329 DOI: 10.1021/acs.jpcb.2c02247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structure of aqueous KNO3 solutions was studied by wide-angle X-ray scattering (WAXS) and density functional theory (DFT). The interference functions were subjected to empirical potential structure refinement (EPSR) modeling to extract the detailed hydration structure information. In aqueous KNO3 solutions with a concentration from 0.50 to 2.72 mol·dm-3, water molecules coordinate K+ with a mean coordination number (CN) from 6.6 ± 0.9 to 5.8 ± 1.2, respectively, and a K-OW(H2O) distance of 2.82 Å. To further describe the hydration properties of K+, a hydration factor (fh) was defined based on the orientational angle between the water O-H vector and the ion-oxygen vector. The fh value obtained for K+ is 0.792, 0.787, 0.766, and 0.765, and the corresponding average hydration numbers (HN) are 5.2, 5.1, 4.8, and 4.5. The reduced HN is compensated by the direct binding of oxygen atoms of NO3- with the average CN from 0.3 ± 0.7 to 2.6 ± 1.7, respectively, and the K-ON(NO3-) distance of 2.82 Å. The average number of water molecules around NO3- slightly reduces from 10.5 ± 1.5 to 9.6 ± 1.7 with rN-OW = 3.63 Å. K+-NO3- ion association is characterized by K-ON and K-N pair correlation functions (PCFs). A K-N peak is observed at 3.81 Å as the main peak with a shoulder at 3.42 Å in gK-N(r). This finding indicates that two occupancy sites are available for K+, i.e., the edge-shared bidentate (BCIP) and the corner-shared monodentate (MCIP) contact ion pairs. The structure and stability of the KNO3(H2O)10 cluster were investigated by a DFT method and cross-checked with the results from WAXS.
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Affiliation(s)
- Hongyan Liu
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China
| | - Yongquan Zhou
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China
| | - Dong An
- Department of Chemical Engineering, Qinghai University, Xining 810016, China
| | - Guangguo Wang
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fayan Zhu
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China
| | - Toshio Yamaguchi
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources; Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province; Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai 810008, China.,Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan, Fukuoka 814-0180, Japan
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Jing Z, Wang G, Zhou Y, Pang D, Zhu F, Liu H. Selectivity of 18-crown-6 ether to alkali ions by density functional theory and molecular dynamics simulation. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113305] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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5
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Wang G, Zhou Y, Lin H, Jing Z, Liu H, Zhu F. Structure of aqueous sodium acetate solutions by X-Ray scattering and density functional theory. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2020-0402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The structure of aq. sodium acetate solution (CH3COONa, NaOAc) was studied by X-ray scattering and density function theory (DFT). For the first hydrated layer of Na+, coordination number (CN) between Na+ and O(W, I) decreases from 5.02 ± 0.85 at 0.976 mol/L to 3.62 ± 1.21 at 4.453 mol/L. The hydration of carbonyl oxygen (OC) and hydroxyl oxygen (OOC) of CH3COO− were investigated separately and the OC shows a stronger hydration bonds comparing with OOC. With concentrations increasing, the hydration shell structures of CH3COO− are not affected by the presence of large number of ions, each CH3COO− group binds about 6.23 ± 2.01 to 7.35 ± 1.73 water molecules, which indicates a relatively strong interaction between CH3COO− and water molecules. The larger uncertainty of the CN of Na+ and OC(OOC) reflects the relative looseness of Na-OC and Na-OOC ion pairs in aq. NaOAc solutions, even at the highest concentration (4.453 mol/L), suggesting the lack of contact ion pair (CIP) formation. In aq. NaOAc solutions, the so called “structure breaking” property of Na+ and CH3COO− become effective only for the second hydration sphere of bulk water. The DFT calculations of CH3COONa (H2O)n=5–7 clusters suggest that the solvent-shared ion pair (SIP) structures appear at n = 6 and become dominant at n = 7, which is well consistent with the result from X-ray scattering.
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Affiliation(s)
- Guangguo Wang
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources , Chinese Academy of Sciences , Qinghai, 810008 , China
- Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province , Xining, 810008 , China
- University of Chinese Academy of Sciences , Beijing, 100049 , China
| | - Yongquan Zhou
- Qinghai Institute of Salt Lakes , Chinese Academy of Sciences , Qinghai, 810008 , China
| | - He Lin
- Shanghai Institute of Applied Physics , Chinese Academy of Sciences , Shanghai, 201204 , China
| | - Zhuanfang Jing
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources , Chinese Academy of Sciences , Qinghai, 810008 , China
- Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province , Xining, 810008 , China
- University of Chinese Academy of Sciences , Beijing, 100049 , China
| | - Hongyan Liu
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources , Chinese Academy of Sciences , Qinghai, 810008 , China
- Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province , Xining, 810008 , China
- University of Chinese Academy of Sciences , Beijing, 100049 , China
| | - Fayan Zhu
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources , Chinese Academy of Sciences , Qinghai, 810008 , China
- Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province , Xining, 810008 , China
- University of Chinese Academy of Sciences , Beijing, 100049 , China
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6
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Hefter G, Buchner R. Dielectric relaxation spectroscopy: an old-but-new technique for the investigation of electrolyte solutions. PURE APPL CHEM 2020. [DOI: 10.1515/pac-2019-1011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Abstract
The use of dielectric relaxation spectroscopy (DRS) for studying electrolyte solutions is reviewed, focussing on the authors’ investigations over the last three decades. It is shown that this often-overlooked technique provides powerful insights into the nature of ion-ion and ion-solvent interactions. DRS is revealed to be particularly useful for detection of weak ion association and, due to its unique ability to detect solvent-separated species, the quantitation of ion pairing. It is demonstrated that DRS correctly determines chemical speciation for ion-paired systems where major spectroscopic techniques (NMR, Raman, UV-vis) fail. DRS also provides important insights into ion solvation. In aqueous solutions, it has been used to build up a coherent set of ‘effective’ hydration numbers for ions based on the dynamics of proximate water molecules, and has a unique ability to detect ‘slow’ water resulting from hydrophilic and hydrophobic hydration of solutes. DRS has been especially useful for characterising the behaviour of ionic liquids (ILs), e.g. showing they possess rather low dielectric constants and, surprisingly, contain no significant concentrations of ion pairs. Neat ILs and their mixtures with molecular solvents are shown by ultra-broadband DRS to exhibit extremely complicated behaviour especially at frequencies in the THz region.
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Affiliation(s)
- Glenn Hefter
- Chemistry Department , Murdoch University , Murdoch , WA 6150 , Australia
| | - Richard Buchner
- Institute for Physical and Theoretical Chemistry, University of Regensburg , D-93040 Regensburg , Germany
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Bonto M, Eftekhari AA, Nick HM. An overview of the oil-brine interfacial behavior and a new surface complexation model. Sci Rep 2019; 9:6072. [PMID: 30988368 PMCID: PMC6465276 DOI: 10.1038/s41598-019-42505-2] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 04/02/2019] [Indexed: 11/29/2022] Open
Abstract
The few existing surface complexation models (SCM) for the brine-oil interface have important limitations: the chemistry of each crude oil is not considered, they cannot capture the water/non-polar hydrocarbons surface charge, the interactions between Na+ and the acid sites are not included, and the equilibrium constants for the adsorption reactions are not validated against experimental data. We address the aforementioned constraints by proposing an improved diffuse-layer SCM for the oil-brine interface. The new model accounts for the chemistry of crude oils by considering surface sites linearly dependent on the TAN (total acid number) and TBN (total base number). We define weak sites to account for the negative surface charge observed for non-polar hydrocarbons in water. We optimize the parameters of our model by fitting the model to reported zeta potential measurements of oil in aqueous solutions. When we validate the optimized model against different experimental data sets, it generally shows a good performance in predicting the surface charge of oil in different brines with different pHs. We show that the acid and base numbers are only useful as a qualitative estimation of the distribution of polar groups at the oil surface, and more sophisticated analysis is necessary to quantify the chemistry of the oil-brine interface.
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Affiliation(s)
- María Bonto
- Danish Hydrocarbon Research and Technology Centre, Technical University of Denmark, Elektrovej building 375, 2800 Kgs, Lyngby, Denmark.
| | - Ali A Eftekhari
- Danish Hydrocarbon Research and Technology Centre, Technical University of Denmark, Elektrovej building 375, 2800 Kgs, Lyngby, Denmark
| | - Hamidreza M Nick
- Danish Hydrocarbon Research and Technology Centre, Technical University of Denmark, Elektrovej building 375, 2800 Kgs, Lyngby, Denmark
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8
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Zhang X, Kumar R, Kuroda DG. Acetate ion and its interesting solvation shell structure and dynamics. J Chem Phys 2018. [DOI: 10.1063/1.5019363] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xiaoliu Zhang
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Revati Kumar
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
| | - Daniel G. Kuroda
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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Krishnamoorthy AN, Zeman J, Holm C, Smiatek J. Preferential solvation and ion association properties in aqueous dimethyl sulfoxide solutions. Phys Chem Chem Phys 2018; 18:31312-31322. [PMID: 27824183 DOI: 10.1039/c6cp05909k] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We study the solvation and the association properties of ion pairs in aqueous dimethyl sulfoxide (DMSO) solution by atomistic molecular dynamics (MD) simulations. The ion pair is composed of two lithium and a single sulfonated diphenyl sulfone ion whose properties are studied under the influence of different DMSO concentrations. For increasing mole fractions of DMSO, we observe a non-ideal behavior of the solution as indicated by the derivatives of the chemical activity. Our findings are complemented by dielectric spectra, which also verify a complex DMSO-water mixing behavior. In agreement with these results, further simulation outcomes reveal an aqueous homoselective solvation of the ion species which fosters the occurrence of pronounced ion association constants at higher DMSO mole fractions. The consequences of this finding are demonstrated by lower ionic conductivities for increasing concentrations of DMSO.
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Affiliation(s)
| | - Johannes Zeman
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
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10
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Houriez C, Vallet V, Réal F, Meot-Ner (Mautner) M, Masella M. Organic ion association in aqueous phase and ab initio-based force fields: The case of carboxylate/ammonium salts. J Chem Phys 2017; 147:161720. [DOI: 10.1063/1.4997996] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Salanne M, Tazi S, Vuilleumier R, Rotenberg B. Ca 2+ -Cl - Association in Water Revisited: the Role of Cation Hydration. Chemphyschem 2017; 18:2807-2811. [PMID: 28510283 DOI: 10.1002/cphc.201700286] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 05/16/2017] [Indexed: 11/08/2022]
Abstract
We investigate the dissociation of a Ca2+ -Cl- pair in water using classical molecular dynamics simulations with a polarizable interaction potential, parameterized from ab initio calculations. By computing the potential of mean force as a function not only of the interionic distance but also of the coordination numbers by water molecules, we show that it is necessary to use a collective variable describing the cation hydration in order to capture the dissociation mechanism. In the contact ion pair, the Ca2+ cation has a first coordination sphere containing 5 or 6 water molecules. The minimum free-energy path for dissociation involves a two-step process: First one or two additional water molecules enter the cation coordination shell, increasing the coordination number up to 7 with an almost fixed interionic distance. Then the dissociation of the ionic pair occurs at this fixed coordination number.
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Affiliation(s)
- Mathieu Salanne
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8234 PHENIX, 4 Place Jussieu, 75005, Paris, France
| | - Sami Tazi
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8234 PHENIX, 4 Place Jussieu, 75005, Paris, France
| | - Rodolphe Vuilleumier
- Sorbonne Universités, UPMC Univ Paris 06, ENS, CNRS, PASTEUR, 75005, Paris, France
| | - Benjamin Rotenberg
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR 8234 PHENIX, 4 Place Jussieu, 75005, Paris, France
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Shi Y, Beck T. Deconstructing Free Energies in the Law of Matching Water Affinities. J Phys Chem B 2017; 121:2189-2201. [DOI: 10.1021/acs.jpcb.7b00104] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Shi
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Thomas Beck
- Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States
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13
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van der Vegt NFA, Haldrup K, Roke S, Zheng J, Lund M, Bakker HJ. Water-Mediated Ion Pairing: Occurrence and Relevance. Chem Rev 2016; 116:7626-41. [DOI: 10.1021/acs.chemrev.5b00742] [Citation(s) in RCA: 155] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nico F. A. van der Vegt
- Eduard-Zintl-Institut
für Anorganische und Physikalische Chemie and Center of Smart
Interfaces, Technische Universität Darmstadt, Alarich-Weiss-Strasse
10, 64287 Darmstadt, Germany
| | - Kristoffer Haldrup
- Physics
Department, NEXMAP Section, Technical University of Denmark, Fysikvej
307, 2800 Kongens
Lyngby, Denmark
| | - Sylvie Roke
- Laboratory
for Fundamental BioPhotonics, Institute of Bioengineering, and Institute
of Materials Science, School of Engineering, and Lausanne Centre for
Ultrafast Science, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Junrong Zheng
- College
of Chemistry and Molecular Engineering, Beijing National Laboratory
for Molecular Sciences, Peking University, Beijing 100871, China
- Department
of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005-1892, United States
| | - Mikael Lund
- Division
of Theoretical Chemistry, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Huib J. Bakker
- FOM Institute AMOLF, Science
Park 104, 1098 XG Amsterdam, The Netherlands
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Huang Z, Hua W, Verreault D, Allen HC. Influence of Salt Purity on Na+ and Palmitic Acid Interactions. J Phys Chem A 2013; 117:13412-8. [PMID: 24041145 DOI: 10.1021/jp406690p] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Zishuai Huang
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Wei Hua
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Dominique Verreault
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Heather C. Allen
- Department of Chemistry & Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
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Dixit MK, Tembe B. Potentials of mean force of sodium chloride ion pair in dimethyl sulfoxide–methanol mixtures. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2012.09.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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