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Elkhafif OW, Hassan HK, Ceblin MU, Farkas A, Jacob T. Influence of Residual Water Traces on the Electrochemical Performance of Hydrophobic Ionic Liquids for Magnesium-Containing Electrolytes. CHEMSUSCHEM 2023; 16:e202300421. [PMID: 37338003 DOI: 10.1002/cssc.202300421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 06/14/2023] [Accepted: 06/16/2023] [Indexed: 06/21/2023]
Abstract
A trace amount of water is typically unavoidable as an impurity in ionic liquids, which is a huge challenge for their application in Mg-ion batteries. Here, we employed molecular sieves of different pore diameters (3, 4, and 5 Å), to effectively remove the trace amounts of water from 1-methyl-1-propylpiperidinium bis(trifluoromethylsulfonyl)imide (MPPip-TFSI) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMP-TFSI). Notably, after sieving (water content <1 mg ⋅ L-1 ), new anodic peaks arise that are attributed to the formation of different anion-cation structures induced by minimizing the influence of hydrogen bonds. Furthermore, electrochemical impedance spectroscopy (EIS) reveals that the electrolyte resistance decreases by ∼10 % for MPPip-TFSI and by ∼28 % for BMP-TFSI after sieving. The electrochemical Mg deposition/dissolution is investigated in MPPip-TFSI/tetraglyme (1 : 1)+100 mM Mg(TFSI)2 +10 mM Mg(BH4 )2 using Ag/AgCl and Mg reference electrodes. The presence of a trace amount of water leads to a considerable shift of 0.9 V vs. Mg2+/ Mg in the overpotential of Mg deposition. In contrast, drying of MPPip-TFSI enhances the reversibility of Mg deposition/dissolution and suppresses the passivation of the Mg electrode.
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Affiliation(s)
- Omar W Elkhafif
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
| | - Hagar K Hassan
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
- Helmholtz Institute Ulm (HIU) - Electrochemical Energy Storage, Helmholtzstr. 11, D-89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), P.O. Box 3640, D-76021, Karlsruhe, Germany
| | - Maximilian U Ceblin
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
| | - Attila Farkas
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
| | - Timo Jacob
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081, Ulm, Germany
- Helmholtz Institute Ulm (HIU) - Electrochemical Energy Storage, Helmholtzstr. 11, D-89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), P.O. Box 3640, D-76021, Karlsruhe, Germany
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2
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Dong W, Alizadeh V, Blasius J, Wylie L, Dick L, Fan Z, Kirchner B. Locality in amino-acid based imidazolium ionic liquids. Phys Chem Chem Phys 2023; 25:24678-24685. [PMID: 37667665 DOI: 10.1039/d3cp02671j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
Several amino-acid based imidazolium ILs are investigated through the use of ab initio molecular dynamics (AIMD), which includes full polarization. The electric dipole moment distribution and polarization is used as a means of characterizing and understanding these complex systems. Various charge scheme methods were analyzed (Wannier function, Blöchl, Löwdin and Mulliken charge schemes and Voronoi tessellation) to determine their ability to predict dipole moments. These results and the following comparison of methods further deepen the knowledge of polarization by highlighting the importance of the anion and cation separately on polarizability contribution and the need to select a suitable method to predict these. The angular probability distribution is utilized to measure the degree of locality in monopole-dipole electrostatic interactions, which showed no preferential alignment over 700 pm. In addition, the IR and Raman spectra from Voronoi tessellation of [C2C1Im][ala] were analyzed. In these, the strongest signalling peaks showed consistency with experiment and the ability to differentiate between anion and cation components of the IL.
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Affiliation(s)
- Wenbo Dong
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.
| | - Vahideh Alizadeh
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.
| | - Jan Blasius
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.
| | - Luke Wylie
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.
| | - Leonard Dick
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.
| | - Zhijie Fan
- Department of Chemistry, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.
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3
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Bhattacharjee S, Khan S. Quantification of the impact of water on the wetting behavior of hydrophilic ionic liquid: a molecular dynamics study. MOLECULAR SIMULATION 2023. [DOI: 10.1080/08927022.2023.2175171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- Sanchari Bhattacharjee
- Department of Chemical & Biochemical Engineering, Indian Institute of Technology Patna, Patna, India
| | - Sandip Khan
- Department of Chemical & Biochemical Engineering, Indian Institute of Technology Patna, Patna, India
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4
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Stoffel TD, Haskins JB, Lawson JW, Markutsya S. Coarse-Grained Dynamically Accurate Simulations of Ionic Liquids: [pyr14][TFSI] and [EMIM][BF 4]. J Phys Chem B 2022; 126:1819-1829. [PMID: 35171594 DOI: 10.1021/acs.jpcb.1c08107] [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
In this work, coarse-grained (CG) models for two different sets of ionic liquids were developed from atomistic molecular dynamics (MD) reference systems, expanding their system size and time duration capabilities. The bonded force field of the CG systems was built using harmonic oscillator potential (HOP) fitting, while the nonbonded force field was generated with the multiscale coarse-graining (MS-CG) approach based on force matching. The dynamics of each system were corrected using the probability distribution function-based coarse-grained molecular dynamics (PDF-based CGMD) method. The structure and dynamics of each system were proven to match reference system data at two temperature scales. CG models and force fields for these liquids were developed to exemplify a general purpose methodology for producing MD results of ionic liquids and other fluids with accurate structural as well as dynamic properties. As an application, developed ionic liquids CG models were then applied to study vacuum-interface interaction. Density profile results of vacuum-interface exposure show significant deviation from bulk behavior. At the interface, multilayer ordering of ionic liquids is predicted to be similar to those observed from an experimental work. This ordering is intensified by decreasing temperature and use of the PDF-based CGMD method as opposed to conventional CG methods.
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Affiliation(s)
- Tyler D Stoffel
- Department of Mechanical Engineering, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Justin B Haskins
- Thermal Protections Branch, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - John W Lawson
- Intelligent Systems Division, NASA Ames Research Center, Moffett Field, California 94035, United States
| | - Sergiy Markutsya
- Department of Mechanical Engineering, University of Kentucky, Paducah, Kentucky 42001, United States
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5
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Gaur A, Balasubramanian S. Liquid Ethylene Glycol: Prediction of Physical Properties, Conformer Population and Interfacial Enrichment with a Refined Non-Polarizable Force Field. Phys Chem Chem Phys 2022; 24:10985-10992. [DOI: 10.1039/d2cp00633b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Periodic density functional theory based molecular dynamics simulations confirm the fraction of molecules in neat liquid ethylene glycol with their central OCCO dihedral in the trans conformation to be 21%,...
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Winter L, Bhuin RG, Maier F, Steinrück H. n-Butane, iso-Butane and 1-Butene Adsorption on Imidazolium-Based Ionic Liquids Studied with Molecular Beam Techniques. Chemistry 2021; 27:17059-17065. [PMID: 34499375 PMCID: PMC9293359 DOI: 10.1002/chem.202102492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Indexed: 11/11/2022]
Abstract
The interaction of molecules, especially hydrocarbons, at the gas/ionic liquid (IL) surface plays a crucial role in supported IL catalysis. The dynamics of this process is investigated by measuring the trapping probabilities of n-butane, iso-butane and 1-butene on a set of frozen 1-alkyl-3-methylimidazolium-based ILs [Cn C1 Im]X, where n=4, 8 and X- =Cl- , Br- , [PF6 ]- and [Tf2 N]- . The decrease of the initial trapping probability with increasing surface temperature is used to determine the desorption energy of the hydrocarbons at the IL surfaces. It increases with increasing alkyl chain length n and decreasing anion size for the ILs studied. We attribute these effects to different degrees of alkyl chain surface enrichment, while interactions between the adsorbate and the anion do not play a significant role. The adsorption energy also depends on the adsorbing molecule: It decreases in the order n-butane>1-butene>iso-butane, which can be explained by different dispersion interactions.
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Affiliation(s)
- Leonhard Winter
- Lehrstuhl für Physikalische Chemie IIFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstr. 391058ErlangenGermany
| | - Radha G. Bhuin
- Lehrstuhl für Physikalische Chemie IIFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstr. 391058ErlangenGermany
| | - Florian Maier
- Lehrstuhl für Physikalische Chemie IIFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstr. 391058ErlangenGermany
| | - Hans‐Peter Steinrück
- Lehrstuhl für Physikalische Chemie IIFriedrich-Alexander-Universität Erlangen-NürnbergEgerlandstr. 391058ErlangenGermany
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7
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Zhang K, Zhou G, Fang T, Jiang K, Liu X. Structural Reorganization of Ionic Liquid Electrolyte by a Rapid Charge/Discharge Circle. J Phys Chem Lett 2021; 12:2273-2278. [PMID: 33645998 DOI: 10.1021/acs.jpclett.1c00156] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The behavior of forming layers near the electrode surface is an important topic for the energy storage with ionic liquid (IL) electrolytes. Here, molecular dynamics (MD) simulations were used to study the behavior of surface active ionic liquid (SAIL) electrolytes near positive electrodes. With the increase of electrode surface charge density, a V-type conformation of the anion [AOT]- for energy storage was shown. The V conformation is easier to replace the latent voids, which is like wedging ions into the layer near the electrodes. Meanwhile, after a rapid charge/discharge circle, there would be more V-type anions appearing in this optimized electrolyte. It is a significant point for the mechanism of nanoscale and microscale energy storage, which provides a theoretical basis for the optimization of efficient IL electrolytes and the design of related experimental research.
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Affiliation(s)
- Kun Zhang
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China
- College of Materials Science and Engineering, Qingdao University, Qingdao 266071, Shandong, China
| | - Guohui Zhou
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China
| | - Timing Fang
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China
| | - Kun Jiang
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China
| | - Xiaomin Liu
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, Shandong, China
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8
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Voegtle MJ, Pal T, Pennathur AK, Menachekanian S, Patrow JG, Sarkar S, Cui Q, Dawlaty JM. Interfacial Polarization and Ionic Structure at the Ionic Liquid-Metal Interface Studied by Vibrational Spectroscopy and Molecular Dynamics Simulations. J Phys Chem B 2021; 125:2741-2753. [PMID: 33689335 DOI: 10.1021/acs.jpcb.0c11232] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ionic liquids (ILs) have both fundamental and practical value in interfacial science and electrochemistry. However, understanding their behavior near a surface is challenging because of strong Coulomb interactions and large and irregular ionic sizes, which affect both their structure and energetics. To understand this problem, we present a combined experimental and computational study using a vibrational probe molecule, 4-mercaptobenzonitrile, inserted at the junction between a metal and a variety of ILs. The vibrational frequency of the nitrile in the probe molecule reports on the local solvation environment and the electrostatic field at this junction. Within the ethylmethyl imidazolium (EMIM+) cation family of ILs, we varied the anions over a range of sizes and types. Complementing our surface spectroscopy, we also ran molecular dynamics simulations of these interfaces to better understand the ionic structures that produced the measured fields. The magnitude of the frequency shifts, and thereby fields, shows a general correlation with the size of anions, with larger anions corresponding to smaller fields. We find that the source of this correlation is partial intercalation of smaller anions into the probe monolayer, resulting in tighter packing of ionic layers near the surface. Larger anions reduce the overall lateral ion packing density near the surface, which reduces the net charge per unit area and explains the smaller observed fields. The insight from this work is important for developing a fundamental picture of concentrated electrolytes near interfaces and can help with designing ILs to create tailored electric fields near an electrode.
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Affiliation(s)
- Matthew J Voegtle
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, United States
| | - Tanmoy Pal
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
| | - Anuj K Pennathur
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, United States
| | - Sevan Menachekanian
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, United States
| | - Joel G Patrow
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, United States
| | - Sohini Sarkar
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, United States
| | - Qiang Cui
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
| | - Jahan M Dawlaty
- Department of Chemistry, University of Southern California, Los Angeles, California 90007, United States
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9
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Celebi AT, Vlugt TJH, Moultos OA. Thermal conductivity of aqueous solutions of reline, ethaline, and glyceline deep eutectic solvents; a molecular dynamics simulation study. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1876263] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Alper T. Celebi
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands
| | - Thijs J. H. Vlugt
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands
| | - Othonas A. Moultos
- Engineering Thermodynamics, Process & Energy Department, Faculty of Mechanical, Maritime and Materials Engineering, Delft University of Technology, Delft, The Netherlands
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10
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11
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Wang YL, Li B, Sarman S, Mocci F, Lu ZY, Yuan J, Laaksonen A, Fayer MD. Microstructural and Dynamical Heterogeneities in Ionic Liquids. Chem Rev 2020; 120:5798-5877. [PMID: 32292036 PMCID: PMC7349628 DOI: 10.1021/acs.chemrev.9b00693] [Citation(s) in RCA: 197] [Impact Index Per Article: 49.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Ionic liquids (ILs) are a special category of molten salts solely composed of ions with varied molecular symmetry and charge delocalization. The versatility in combining varied cation-anion moieties and in functionalizing ions with different atoms and molecular groups contributes to their peculiar interactions ranging from weak isotropic associations to strong, specific, and anisotropic forces. A delicate interplay among intra- and intermolecular interactions facilitates the formation of heterogeneous microstructures and liquid morphologies, which further contributes to their striking dynamical properties. Microstructural and dynamical heterogeneities of ILs lead to their multifaceted properties described by an inherent designer feature, which makes ILs important candidates for novel solvents, electrolytes, and functional materials in academia and industrial applications. Due to a massive number of combinations of ion pairs with ion species having distinct molecular structures and IL mixtures containing varied molecular solvents, a comprehensive understanding of their hierarchical structural and dynamical quantities is of great significance for a rational selection of ILs with appropriate properties and thereafter advancing their macroscopic functionalities in applications. In this review, we comprehensively trace recent advances in understanding delicate interplay of strong and weak interactions that underpin their complex phase behaviors with a particular emphasis on understanding heterogeneous microstructures and dynamics of ILs in bulk liquids, in mixtures with cosolvents, and in interfacial regions.
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Affiliation(s)
- Yong-Lei Wang
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Bin Li
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
| | - Sten Sarman
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Francesca Mocci
- Department
of Chemical and Geological Sciences, University
of Cagliari, I-09042 Monserrato, Italy
| | - Zhong-Yuan Lu
- State
Key Laboratory of Supramolecular Structure and Materials, Institute
of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Jiayin Yuan
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Aatto Laaksonen
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
- State
Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
- Centre of
Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda, 41A, 700487 Iasi, Romania
- Department
of Engineering Sciences and Mathematics, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Michael D. Fayer
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
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12
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Bhattacharjee S, Khan S. The wetting behavior of aqueous imidazolium based ionic liquids: a molecular dynamics study. Phys Chem Chem Phys 2020; 22:8595-8605. [PMID: 32255456 DOI: 10.1039/d0cp00143k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aqueous ionic liquids are of particular interest due to their tunability of physical and chemical properties and a deeper understanding of their structure-property relationship is desired. Molecular dynamics (MD) simulations were conducted to study the wetting behavior of aqueous imidazolium-based ionic liquids (ILs), consisting of a 1-ethyl-3-methylimidazolium [EMIM]+ cation and either a hydrophilic boron tetrafluoride [BF4]- or a hydrophobic bis(trifluoromethylsulfonyl)imide [NTF2]- anion mixed in water. To understand the effect of anion and concentration of ILs at the graphite solid-liquid interface, wettability studies were performed with IL concentrations from 0-50 wt%. The contact angle of aqueous IL droplets decreases with increasing IL concentration. Droplet characteristics near the surface were investigated by profiling the density perpendicular (z-direction) and horizontal (r-direction) to the graphite sheet; this was further quantified by an orientation order parameter. Due to the preferred adsorption of ILs, water depletes near the surface as IL concentration increases. The hydrophobic [NTF2]- anion forces the IL toward the interface from the bulk, whereas the hydrophilic [BF4]- anion causes the IL to remain in the bulk of the droplet. Differences in water-anion hydrogen bonding, the nature of the anions, and their interfacial tensions are crucial factors in the wetting behavior of aqueous ionic liquids.
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Affiliation(s)
- Sanchari Bhattacharjee
- Department of Chemical and Biochemical Engineering, Indian Institute of Technology Patna, 801103, India.
| | - Sandip Khan
- Department of Chemical and Biochemical Engineering, Indian Institute of Technology Patna, 801103, India.
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13
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Broderick A, Rocha MA, Khalifa Y, Shiflett MB, Newberg JT. Mass Transfer Thermodynamics through a Gas-Liquid Interface. J Phys Chem B 2019; 123:2576-2584. [PMID: 30803233 DOI: 10.1021/acs.jpcb.9b00958] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Molecular level information about thermodynamic variations (enthalpy, entropy, and free energy) of a gas molecule as it crosses a gas-liquid interface is strongly lacking from an experimental perspective under equilibrium conditions. Herein, we perform in situ measurements of water interacting with the ionic liquid (IL) 1-butyl-3-methylimidazolium acetate, [C4mim][Ace], using ambient pressure X-ray photoelectron spectroscopy in order to assess the interfacial uptake of water quantitatively as a function of temperature, pressure, and water mole fraction ( xw). The surface spectroscopy results are compared to existing bulk water absorption experiments, showing that the amount of water in the interfacial region is consistently greater than that in the bulk. The enthalpy and entropy of water sorption vary significantly between the gas-liquid interface and the bulk as a function of xw, with a crossover that occurs near xw = 0.6 where the water-IL mixture converts from being homogeneous ( xw < 0.6) to nanostructured ( xw > 0.6). Free energy results reveal that water at the gas-IL interface is thermodynamically more favorable than that in the bulk, consistent with the enhanced water concentration in the interfacial region. The results herein show that the efficacy for an ionic liquid to absorb a gas phase molecule is not merely a function of bulk solvation parameters but also is significantly influenced by the thermodynamics occurring across the gas-IL interface during the mass transfer process.
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Affiliation(s)
- Alicia Broderick
- Department of Chemistry and Biochemistry , University of Delaware , Newark , Delaware 19716 , United States
| | - M Alejandra Rocha
- Department of Chemical and Petroleum Engineering , University of Kansas , Lawrence , Kansas 66045 , United States
| | - Yehia Khalifa
- Department of Chemistry and Biochemistry , University of Delaware , Newark , Delaware 19716 , United States
| | - Mark B Shiflett
- Department of Chemical and Petroleum Engineering , University of Kansas , Lawrence , Kansas 66045 , United States
| | - John T Newberg
- Department of Chemistry and Biochemistry , University of Delaware , Newark , Delaware 19716 , United States
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14
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Dzida M, Musiał M, Zorębski E, Zorębski M, Jacquemin J, Goodrich P, Wojnarowska Z, Paluch M. Comparative study of effect of alkyl chain length on thermophysical characteristics of five N-alkylpyridinium bis(trifluoromethylsulfonyl)imides with selected imidazolium-based ionic liquids. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Smoll EJ, Purcell SM, D'Andrea L, Slattery JM, Bruce DW, Costen ML, McKendrick KG, Minton TK. Probing Conformational Heterogeneity at the Ionic Liquid-Vacuum Interface by Reactive-Atom Scattering. J Phys Chem Lett 2019; 10:156-163. [PMID: 30537842 DOI: 10.1021/acs.jpclett.8b02920] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The atomic-level description of liquid interfaces has lagged behind that of solid crystalline surfaces because existing experimental techniques have been limited in their capability to report molecular structure in a fluctuating liquid interfacial layer. We have moved toward a more detailed experimental description of the gas-liquid interface by studying the F-atom scattering dynamics on a common ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. When given contrast by deuterium labeling, the yield and dynamical behavior of reactively scattered HF isotopologues can resolve distinct signatures from the cation butyl, methyl, and ring groups, which help to quantify the relative populations of cation conformations at the liquid-vacuum interface. These results demonstrate the importance of molecular organization in driving site-specific reactions at the extreme outer regions of the gas-liquid interface.
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Affiliation(s)
- Eric J Smoll
- Department of Chemistry and Biochemistry , Montana State University , Bozeman , Montana 59717 , United States
| | - Simon M Purcell
- Institute of Chemical Sciences, School of Engineering and Physical Sciences , Heriot-Watt University , Edinburgh EH14 4AS , U.K
| | - Lucia D'Andrea
- Department of Chemistry , University of York , Heslington , York YO10 5DD , U.K
| | - John M Slattery
- Department of Chemistry , University of York , Heslington , York YO10 5DD , U.K
| | - Duncan W Bruce
- Department of Chemistry , University of York , Heslington , York YO10 5DD , U.K
| | - Matthew L Costen
- Institute of Chemical Sciences, School of Engineering and Physical Sciences , Heriot-Watt University , Edinburgh EH14 4AS , U.K
| | - Kenneth G McKendrick
- Institute of Chemical Sciences, School of Engineering and Physical Sciences , Heriot-Watt University , Edinburgh EH14 4AS , U.K
| | - Timothy K Minton
- Department of Chemistry and Biochemistry , Montana State University , Bozeman , Montana 59717 , United States
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17
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Khalifa Y, Broderick A, Newberg JT. Surface enhancement of water at the ionic liquid-gas interface of [HMIM][Cl] under ambient water vapor. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:325001. [PMID: 29972140 DOI: 10.1088/1361-648x/aad102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The ionic liquid-gas interface of 1-hexyl-3-methyl-imidazolium chloride, [HMIM][Cl], was examined in the presence of water vapor using lab-based ambient pressure x-ray photoelectron spectroscopy (APXPS) at room temperature. The interfacial water uptake was measured quantitatively in the pressure range of high vacuum up to a maximum of 5 Torr (27% RH) and back to high vacuum in a systematic manner. Water mole fractions in the interface determined from APXPS were compared to previously published tandem differential mobility analysis results on [HMIM][Cl] nanodroplets. Our findings show that water constitutes a significantly larger mole fraction at the interface when compared to the bulk. Additionally, the reverse isotherms showed that the uptake of water at the interface of [HMIM][Cl] is a reversible process.
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Affiliation(s)
- Yehia Khalifa
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, United States of America
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18
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Sedghamiz E, Moosavi M. Probing the tricationic ionic liquid/vacuum interface: insights from molecular dynamics simulations. Phys Chem Chem Phys 2018; 20:14251-14263. [DOI: 10.1039/c8cp02471e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The surface properties of three symmetric linear tricationic ionic liquids (LTILs) with the common anion, bis(trifluoromethylsulfonyl)imide ([NTf2]−), were studied using atomistic molecular dynamics simulation and identification of the truly interfacial molecules (ITIM) analysis.
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Affiliation(s)
- Elaheh Sedghamiz
- Department of Chemistry
- University of Isfahan
- Isfahan 81746-73441
- Iran
| | - Majid Moosavi
- Department of Chemistry
- University of Isfahan
- Isfahan 81746-73441
- Iran
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19
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Affiliation(s)
- Kun Dong
- State Key Laboratory of Multiphase
Complex Systems, Beijing Key Laboratory of Ionic Liquids Clean Process,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaomin Liu
- State Key Laboratory of Multiphase
Complex Systems, Beijing Key Laboratory of Ionic Liquids Clean Process,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Haifeng Dong
- State Key Laboratory of Multiphase
Complex Systems, Beijing Key Laboratory of Ionic Liquids Clean Process,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiangping Zhang
- State Key Laboratory of Multiphase
Complex Systems, Beijing Key Laboratory of Ionic Liquids Clean Process,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Suojiang Zhang
- State Key Laboratory of Multiphase
Complex Systems, Beijing Key Laboratory of Ionic Liquids Clean Process,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
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20
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Begić S, Jónsson E, Chen F, Forsyth M. Molecular dynamics simulations of pyrrolidinium and imidazolium ionic liquids at graphene interfaces. Phys Chem Chem Phys 2017; 19:30010-30020. [DOI: 10.1039/c7cp03389c] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
MD simulations of ionic liquids support AFM data and point towards a likely relationship between interfacial structures and electrochemical performance.
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Affiliation(s)
- Srđan Begić
- ARC Centre of Excellence for Electromaterials Science and Institute for Frontier Materials (IFM)
- Burwood
- Australia
| | - Erlendur Jónsson
- ARC Centre of Excellence for Electromaterials Science and Institute for Frontier Materials (IFM)
- Burwood
- Australia
| | - Fangfang Chen
- ARC Centre of Excellence for Electromaterials Science and Institute for Frontier Materials (IFM)
- Burwood
- Australia
| | - Maria Forsyth
- ARC Centre of Excellence for Electromaterials Science and Institute for Frontier Materials (IFM)
- Burwood
- Australia
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21
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Physicochemical and thermodynamic properties of imidazolium ionic liquids with nitrile and ether dual functional groups. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.049] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Konieczny JK, Szefczyk B. Structure of Alkylimidazolium-Based Ionic Liquids at the Interface with Vacuum and Water—A Molecular Dynamics Study. J Phys Chem B 2015; 119:3795-807. [DOI: 10.1021/jp510843m] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jan K. Konieczny
- Advanced Materials Engineering and Modelling Group, Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
| | - Borys Szefczyk
- Advanced Materials Engineering and Modelling Group, Faculty of Chemistry, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
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23
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Stockmann TJ, Ding Z. Electrochemical behaviour of ferrocenes in tributylmethylphosphonium methyl sulfate mixtures with water and 1,2-dichloroethane. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Electron transfer (ET) reactions in ionic liquid (IL)|organic solvent (1,2-dichloroethane, DCE) and IL|water mixtures were investigated using a Pt disk ultramicroelectrode (UME) along with ferrocene (Fc) and ferrocenemethanol (FcCH2OH) redox probes as electroactive species dissolved in the respective mixtures. The IL utilized was tributylmethylphosphonium methyl sulfate (P4441CH3SO4). The diffusion coefficient of each redox species was determined at each incremental increase of DCE or water to the IL using a chronoamperometric technique that is concentration independent. The IL|DCE mixture exhibited little change in the Fc diffusion coefficient, DFc, up to a DCE mole fraction (χDCE) of 0.5; the observed value, 2.0 × 10−8 cm2 s−1, agrees well with that typically reported for ILs in the literature. After which, the DFc quickly rose to a value commonly found in conventional molecular solvents, 1.3 × 10−5 cm2 s−1 (at χDCE = 0.8). An analogous result was not observed for IL|water mixtures using FcCH2OH, such that [Formula: see text] varied from 0.2 to 1.2 × 10−9 cm2·s−1 at a [Formula: see text] of 0 to 0.8. It was proposed that a large increase in the DFc in the IL|DCE mixture versus [Formula: see text] in the IL|water series was owing to P4441CH3SO4’s more hydrophobic character. Its hydrophobicity was quantified by measuring the formal ion transfer potentials of the IL component ions at a water|DCE immiscible interface.
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Affiliation(s)
- T. Jane Stockmann
- Laboratoire d’Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015 Lausanne, Switzerland
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Zhifeng Ding
- Department of Chemistry, The University of Western Ontario, Chemistry Building, 1151 Richmond Street, London, ON N6A 5B7, Canada
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24
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Iwahashi T, Ishiyama T, Sakai Y, Morita A, Kim D, Ouchi Y. Liquid/liquid interface layering of 1-butanol and [bmim]PF6 ionic liquid: a nonlinear vibrational spectroscopy and molecular dynamics simulation study. Phys Chem Chem Phys 2015; 17:24587-97. [DOI: 10.1039/c5cp03307a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
IV-SFG vibrational spectroscopy and MD simulation studies reveal a local polar/nonpolar layering structure at the interface of 1-butanol-d9 and 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6).
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Affiliation(s)
- Takashi Iwahashi
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Tatsuya Ishiyama
- Department of Applied Chemistry
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Yasunari Sakai
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Akihiro Morita
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai
- Japan
| | - Doseok Kim
- Department of Physics
- Sogang University
- Seoul
- Republic of Korea
| | - Yukio Ouchi
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo
- Japan
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25
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Palchowdhury S, Bhargava BL. Ionic liquids at nonane-water interfaces: molecular dynamics studies. J Phys Chem B 2014; 118:13930-9. [PMID: 25387241 DOI: 10.1021/jp508950k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The structures of ternary systems with water, nonane, and an ionic liquid, with the ionic liquid placed between water and nonane, have been studied using atomistic molecular dynamics simulations. Three different ionic liquids with 1-n-butyl-3-methylimidazolium cation and bromide, tetrafluoroborate, and trifluoromethanesulfonate anions have been studied. The ionic liquids disperse into the aqueous phase quickly and are solubilized in water within 15 ns to form two equivalent nonane-aqueous ionic liquid interfaces. The interfacial region is enriched with ionic liquids due to the amphiphilicity of the cations. The presence of ionic liquids at the interface reduces the interfacial tension between the nonane and water, thus facilitating the mixing of aqueous and nonane phases. The reduction in the interfacial tension is found to be inversely related to the solubility of the corresponding ionic liquid in water. The butyl chains of the cations and the trifluoromethanesulfonate anions present in the interfacial region are found to be preferentially oriented parallel to the interface normal.
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Affiliation(s)
- Sourav Palchowdhury
- School of Chemical Sciences, National Institute of Science Education & Research , Bhubaneswar - 751005, Odisha, India
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26
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Almeida HFD, Freire MG, Fernandes AM, Lopes-da-Silva JA, Morgado P, Shimizu K, Filipe EJM, Lopes JNC, Santos LMNBF, Coutinho JAP. Cation alkyl side chain length and symmetry effects on the surface tension of ionic liquids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6408-18. [PMID: 24834955 DOI: 10.1021/la501308q] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Aiming at providing a comprehensive study of the influence of the cation symmetry and alkyl side chain length on the surface tension and surface organization of ionic liquids (ILs), this work addresses the experimental measurements of the surface tension of two extended series of ILs, namely R,R'-dialkylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C(n)C(n)im][NTf2]) and R-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C(n)C(1)im][NTf2]), and their dependence with temperature (from 298 to 343 K). For both series of ILs the surface tension decreases with an increase in the cation side alkyl chain length up to aliphatic chains no longer than hexyl, here labeled as critical alkyl chain length (CACL). For ILs with aliphatic moieties longer than CACL the surface tension displays an almost constant value up to [C12C12im][NTf2] or [C16C1im][NTf2]. These constant values further converge to the surface tension of long chain n-alkanes, indicating that, for sufficiently long alkyl side chains, the surface ordering is strongly dominated by the aliphatic tails present in the IL. The enthalpies and entropies of surface were also derived and the critical temperatures were estimated from the experimental data. The trend of the derived thermodynamic properties highlights the effect of the structural organization of the IL at the surface with visible trend shifts occurring at a well-defined CACL in both symmetric and asymmetric series of ILs. Finally, the structure of a long-alkyl side chain IL at the vacuum-liquid interface was also explored using Molecular Dynamics simulations. In general, it was found that for the symmetric series of ILs, at the outermost polar layers, more cations point one of their aliphatic tails outward and the other inward, relative to the surface, than cations pointing both tails outward. The number of the former, while being the preferred conformation, exceeds the latter by around 75%.
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Affiliation(s)
- Hugo F D Almeida
- Departamento de Química, CICECO, Universidade de Aveiro , 3810-193 Aveiro, Portugal
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27
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Particle self-assembly at ionic liquid-based interfaces. Adv Colloid Interface Sci 2014; 206:92-105. [PMID: 24230971 DOI: 10.1016/j.cis.2013.09.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Revised: 08/31/2013] [Accepted: 09/20/2013] [Indexed: 11/20/2022]
Abstract
This review presents an overview of the nature of ionic liquid (IL)-based interfaces and self-assembled particle morphologies of IL-in-water, oil- and water-in-IL, and novel IL-in-IL Pickering emulsions with emphasis on their unique phenomena, by means of experimental and computational studies. In IL-in-water Pickering emulsions, particles formed monolayers at ionic liquid-water interfaces and were close-packed on fully covered emulsion droplets or aggregated on partially covered droplets. Interestingly, other than equilibrating at the ionic liquid-water interfaces, microparticles with certain surface chemistries were extracted into the ionic liquid phase with a high efficiency. These experimental findings were supported by potential of mean force calculations, which showed large energy drops as hydrophobic particles crossed the interface into the IL phase. In the oil- and water-in-IL Pickering emulsions, microparticles with acidic surface chemistries formed monolayer bridges between the internal phase droplets rather than residing at the oil/water-ionic liquid interfaces, a significant deviation from traditional Pickering emulsion morphology. Molecular dynamics simulations revealed aspects of the mechanism behind this bridging phenomenon, including the role of the droplet phase, surface chemistry, and inter-particle film. Novel IL-in-IL Pickering emulsions exhibited an array of self-assembled morphologies including the previously observed particle absorption and bridging phenomena. The appearance of these morphologies depended on the particle surface chemistry as well as the ILs used. The incorporation of particle self-assembly with ionic liquid science allows for new applications at the intersection of these two fields, and have the potential to be numerous due to the tunability of the ionic liquids and particles incorporated, as well as the particle morphology by combining certain groups of particle surface chemistry, IL type (protic or aprotic), and whether oil or water is incorporated.
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28
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Affiliation(s)
- Maxim V Fedorov
- Department of Physics, Scottish University Physics Alliance (SUPA), University of Strathclyde , John Anderson Bldg, 107 Rottenrow, Glasgow, G4 0NG United Kingdom
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29
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30
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Lísal M. The liquid surface of chiral ionic liquids as seen from molecular dynamics simulations combined with intrinsic analysis. J Chem Phys 2013; 139:214701. [DOI: 10.1063/1.4833335] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Elola MD, Rodriguez J. Structure and dynamics of nonionic surfactants adsorbed at vacuum/ionic liquid interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13379-13387. [PMID: 24156286 DOI: 10.1021/la402683j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Structural and dynamical properties related to the adsorption of nonionic surfactants at vacuum/ionic liquid interfaces were studied using molecular dynamics simulations. Specifically, the surface activity of pentaethylene glycol monododecyl ether (C12E5) was investigated at the free interface of an imidazolium-based room temperature ionic liquid (RTIL), at different surface densities. At low surface coverages, the incorporation of C12E5 does not produce meaningful changes in the vacuum/RTIL interface: the C12E5 hydrophobic tails remain entangled with those of the RTIL cation groups in the outer shell, whereas the C12E5 hydrophilic heads reside at an inner layer. At high surface coverages, the structure in the substrate-in terms of the features exhibited by the local density profiles-practically vanishes; the interface becomes wider and the surfactant molecules shift toward more external positions. Information about the local structure of the interface at high surface densities can be recovered by performing a tessellation procedure. For the sake of comparison, the surface behavior of two commonly used ionic surfactants, sodium dodecyl sulfate and dodecyl trimethyl ammonium chloride, were also studied. The modifications in the width and structure of the bare vacuum/RTIL interface due to the presence of the ionic surfactants are markedly milder than those observed for the nonionic surfactant. Moreover, the RTIL seemed to behave as a better solvent for the chloride counterions than for sodium ones; which were found to remain bound to the surfactant head groups. An analysis of the dynamics at the surface was also performed. Our results indicate that the presence of increasing amounts of nonionic surfactants leads to a gradual reduction of the mobility of the RTIL species. When ionic surfactants are adsorbed, these retardations are even more severe for the surfactant head groups, where the corresponding diffusion coefficients show reductions of practically 1 order of magnitude.
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Affiliation(s)
- M Dolores Elola
- Departamento de Física, Comisión Nacional de Energía Atómica , Avenida Libertador 8250, 1429 Buenos Aires, Argentina , and
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32
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Lísal M, Izák P. Molecular dynamics simulations of n-hexane at 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide interface. J Chem Phys 2013; 139:014704. [DOI: 10.1063/1.4811673] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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33
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34
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Deshmukh KM, Madyal RS, Qureshi ZS, Gaikar V.G, Bhanage BM. Experimental and Theoretical Investigations of Consequence of Ionic Liquid Anion on Copper(I) Catalyzed Reaction of Aryl Iodide and Thiols. Ind Eng Chem Res 2013. [DOI: 10.1021/ie3035338] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Krishna M. Deshmukh
- Department of Chemistry, Institute of Chemical Technology, N.
M. Parekh Marg, Matunga, Mumbai-400 019, India
| | - Rupa S. Madyal
- Department of Chemical
Engineering, Institute of Chemical Technology, N. M. Parekh Marg, Matunga, Mumbai-400 019, India
| | - Ziyauddin S. Qureshi
- Department of Chemistry, Institute of Chemical Technology, N.
M. Parekh Marg, Matunga, Mumbai-400 019, India
| | - Vilas .G Gaikar
- Department of Chemical
Engineering, Institute of Chemical Technology, N. M. Parekh Marg, Matunga, Mumbai-400 019, India
| | - Bhalchandra M. Bhanage
- Department of Chemistry, Institute of Chemical Technology, N.
M. Parekh Marg, Matunga, Mumbai-400 019, India
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35
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Molecular dynamics study of ionic liquid film based on [emim][Tf2N] and [emim][TfO] adsorbed on highly oriented pyrolytic graphite. Chem Res Chin Univ 2013. [DOI: 10.1007/s40242-013-2082-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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36
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Oliveira MB, Domínguez-Pérez M, Freire MG, Llovell F, Cabeza O, Lopes-da-Silva JA, Vega LF, Coutinho JAP. Surface Tension of Binary Mixtures of 1-Alkyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide Ionic Liquids: Experimental Measurements and Soft-SAFT Modeling. J Phys Chem B 2012; 116:12133-41. [DOI: 10.1021/jp3059905] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. B. Oliveira
- Chemistry Department, CICECO& QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - M. Domínguez-Pérez
- Mesturas Group, Departamento
de Física, Facultade de Ciencias, Universidade da Coruña, 15008 A Coruña, Spain
| | - M. G. Freire
- Chemistry Department, CICECO& QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - F. Llovell
- MATGAS Research Center (Carburos Metálicos/Air Products, CSIC, UAB),
Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - O. Cabeza
- Mesturas Group, Departamento
de Física, Facultade de Ciencias, Universidade da Coruña, 15008 A Coruña, Spain
| | - J. A. Lopes-da-Silva
- Chemistry Department, CICECO& QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - L. F. Vega
- MATGAS Research Center (Carburos Metálicos/Air Products, CSIC, UAB),
Campus UAB, 08193 Bellaterra, Barcelona, Spain
- Carburos Metálicos/Air Products Group, C/Aragón, 300, 08069 Barcelona,
Spain
| | - J. A. P. Coutinho
- Chemistry Department, CICECO& QOPNA, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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37
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Skarmoutsos I, Dellis D, Matthews RP, Welton T, Hunt PA. Hydrogen Bonding in 1-Butyl- and 1-Ethyl-3-methylimidazolium Chloride Ionic Liquids. J Phys Chem B 2012; 116:4921-33. [DOI: 10.1021/jp209485y] [Citation(s) in RCA: 142] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ioannis Skarmoutsos
- Chemistry Department, Imperial College London, London SW7 2AZ, United Kingdom
| | - Dimitris Dellis
- Institute of Accelerating Systems and Applications, Panepistimiopolis Zografou,
15784 Athens, Greece
| | - Richard P. Matthews
- Chemistry Department, Imperial College London, London SW7 2AZ, United Kingdom
| | - Tom Welton
- Chemistry Department, Imperial College London, London SW7 2AZ, United Kingdom
| | - Patricia A. Hunt
- Chemistry Department, Imperial College London, London SW7 2AZ, United Kingdom
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38
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Li X, Schatz GC, Nesbitt DJ. Anion Effects in the Scattering of CO2 from the Room-Temperature Ionic Liquids [bmim][BF4] and [bmim][Tf2N]: Insights from Quantum Mechanics/Molecular Mechanics Trajectories. J Phys Chem B 2012; 116:3587-602. [DOI: 10.1021/jp2123357] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiaohu Li
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston,
Illinois 60208-3113, United States
| | - George C. Schatz
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston,
Illinois 60208-3113, United States
| | - David J. Nesbitt
- JILA, Campus Box 440, University of Colorado, Boulder, Colorado 80309-0440,
United States
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39
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Lovelock KRJ. Influence of the ionic liquid/gas surface on ionic liquid chemistry. Phys Chem Chem Phys 2012; 14:5071-89. [PMID: 22349469 DOI: 10.1039/c2cp23851a] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Applications such as gas storage, gas separation, NP synthesis and supported ionic liquid phase catalysis depend upon the interaction of different species with the ionic liquid/gas surface. Consequently, these applications cannot proceed to the full extent of their potential without a profound understanding of the surface structure and properties. As a whole, this perspective contains more questions than answers, which demonstrates the current state of the field. Throughout this perspective, crucial questions are posed and a roadmap is proposed to answer these questions. A critical analysis is made of the field of ionic liquid/gas surface structure and properties, and a number of design rules are mined. The effects of ionic additives on the ionic liquid/gas surface structure are presented. A possible driving force for surface formation is discussed that has, to the best of my knowledge, not been postulated in the literature to date. This driving force suggests that for systems composed solely of ions, the rules for surface formation of dilute electrolytes do not apply. The interaction of neutral additives with the ionic liquid/gas surface is discussed. Particular attention is focussed upon H(2)O and CO(2), vital additives for many applications of ionic liquids. Correlations between ionic liquid/gas surface structure and properties, ionic liquid surfaces plus additives, and ionic liquid applications are given.
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Affiliation(s)
- Kevin R J Lovelock
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
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40
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Xu A, Wang J, Zhang Y, Chen Q. Effect of Alkyl Chain Length in Anions on Thermodynamic and Surface Properties of 1-Butyl-3-methylimidazolium Carboxylate Ionic Liquids. Ind Eng Chem Res 2012. [DOI: 10.1021/ie201345t] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Airong Xu
- School of
Chemistry and Environmental
Science, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, Henan Normal University,
Xinxiang, Henan 453007, P. R. China
- School of Chemical Engineering
and Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, P. R. China
| | - Jianji Wang
- School of
Chemistry and Environmental
Science, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, Henan Normal University,
Xinxiang, Henan 453007, P. R. China
- School of Chemical Engineering
and Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, P. R. China
| | - Yajuan Zhang
- School of
Chemistry and Environmental
Science, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, Henan Normal University,
Xinxiang, Henan 453007, P. R. China
| | - Qingtai Chen
- School of
Chemistry and Environmental
Science, Key Laboratory of Green Chemical Media and Reactions, Ministry
of Education, Henan Normal University,
Xinxiang, Henan 453007, P. R. China
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41
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Jiang H, Zhao F, Wang J, Liu Z, Ren J, Liu R, Shang J, Hu Y. Molecular simulations of imidazolium-based ionic liquids with [l-lactate]− anion and the binary mixture of [bmim][l-lactate] and 1-octanol. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2011.10.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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42
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Lísal M, Posel Z, Izák P. Air–liquid interfaces of imidazolium-based [TF2N−] ionic liquids: insight from molecular dynamics simulations. Phys Chem Chem Phys 2012; 14:5164-77. [DOI: 10.1039/c2cp23572b] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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43
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Hantal G, Voroshylova I, Cordeiro MNDS, Jorge M. A systematic molecular simulation study of ionic liquid surfaces using intrinsic analysis methods. Phys Chem Chem Phys 2012; 14:5200-13. [DOI: 10.1039/c2cp23967a] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cao Y, Chen Y, Sun X, Zhang Z, Mu T. Water sorption in ionic liquids: kinetics, mechanisms and hydrophilicity. Phys Chem Chem Phys 2012; 14:12252-62. [DOI: 10.1039/c2cp41798g] [Citation(s) in RCA: 154] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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WANG JUN, ZENG XIAOCHENG. COMPUTER SIMULATION OF LIQUID–VAPOR INTERFACIAL TENSION: LENNARD-JONES FLUID AND WATER REVISITED. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633609005027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We review several commonly used simulation methods for computing liquid–vapor surface tension and associated theoretical treatments of the long-range correction for inhomogeneous systems. Prototype model systems considered in this review are the Lennard-Jones (LJ) fluid and the SPC/E model water. In addition, we examine a variety of factors that can affect calculation of the surface tension γ via the mechanical approach (i.e. using either KB or IK method). It is found that for the LJ fluid, the size of simulation box and the number of particles in the system can have notable effects on the computed surface tension. For SPC/E water, the Ewald parameters can influence computed surface tensions (γ) as well, e.g., very small Ewald parameters tend to overestimate γ. It is also found that the IK method consistently gives γ that are 0.6 - 0.9 mN/m greater than γ computed based on the KB method. When computing the first reciprocal–space contribution to the surface tension, the Ghoufi's strategy gives rise to more sensible profile of pressure difference PN(z)-PT(z) than the Alejandre's strategy although both strategies result in nearly the same average surface tension through the integration of PN(z)-PT(z).
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Affiliation(s)
- JUN WANG
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - XIAO CHENG ZENG
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
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Frost DS, Dai LL. Molecular dynamics simulations of nanoparticle self-assembly at ionic liquid-water and ionic liquid-oil interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11339-11346. [PMID: 21823636 DOI: 10.1021/la202069m] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have studied the self-assembly of hydrophobic nanoparticles at ionic liquid (IL)-water and IL-oil (hexane) interfaces using molecular dynamics (MD) simulations. For the 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF(6)])/water system, the nanoparticles rapidly approached the IL-water interface and equilibrated more into the IL phase although they were initially in the water phase. In contrast, when the nanoparticles were dispersed in the hexane phase, they slowly approached the IL-hexane interface but remained primarily in the hexane phase. Consequently, the IL-hexane interface was rather undisturbed by the nanoparticles whereas the IL-water interface changed significantly in width and morphology to accommodate the presence of the nanoparticles. The equilibrium positions of the nanoparticles were also supported and explained by potential of mean force (PMF) calculations. Interesting ordering and charge distributions were observed at the IL-liquid interfaces. At the IL-hexane interface, the [BMIM] cations preferentially oriented themselves so that they were immersed more in the hexane phase and packed efficiently to reduce steric hindrance. The ordering likely contributed to a heightened IL density and a slightly positive charge at the IL-hexane interface. In contrast, the cations at the IL-water interface were oriented isotropically unless in the presence of nanoparticles, where the cations aligned across the nanoparticle surfaces.
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Affiliation(s)
- Denzil S Frost
- The School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, Arizona 85287, USA
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Perez-Blanco ME, Maginn EJ. Molecular Dynamics Simulations of Carbon Dioxide and Water at an Ionic Liquid Interface. J Phys Chem B 2011; 115:10488-99. [DOI: 10.1021/jp203838j] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcos E. Perez-Blanco
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556, United States
| | - Edward J. Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, 182 Fitzpatrick Hall, Notre Dame, Indiana 46556, United States
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Bhargava BL, Klein ML. Nanoscale Organization in Aqueous Dicationic Ionic Liquid Solutions. J Phys Chem B 2011; 115:10439-46. [DOI: 10.1021/jp204413n] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- B. L. Bhargava
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania 19122, United States
- The Laboratory for Research on the Structure of Matter, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104-6202, United States
| | - Michael L. Klein
- Institute for Computational Molecular Science and Department of Chemistry, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania 19122, United States
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Tariq M, Freire MG, Saramago B, Coutinho JAP, Lopes JNC, Rebelo LPN. Surface tension of ionic liquids and ionic liquid solutions. Chem Soc Rev 2011; 41:829-68. [PMID: 21811714 DOI: 10.1039/c1cs15146k] [Citation(s) in RCA: 228] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Some of the most active scientific research fronts of the past decade are centered on ionic liquids. These fluids present characteristic surface behavior and distinctive trends of their surface tension versus temperature. One way to explore and understand their unique nature is to study their surface properties. This critical review analyses most of the surface tension data reported between 2001 and 2010 (187 references).
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Affiliation(s)
- Mohammad Tariq
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. República, Apt. 127, 2780-901 Oeiras, Portugal
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