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Bou Tannous L, Simoes Santos M, Gong Z, Haumesser PH, Benayad A, Padua AAH, Steinberger A. Effect of Surface Chemistry on the Electrical Double Layer in a Long-Chain Ionic Liquid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16785-16796. [PMID: 37970757 DOI: 10.1021/acs.langmuir.3c02123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2023]
Abstract
Room temperature ionic liquids (ILs) can create a strong accumulation of charges at solid interfaces by forming a very thin and dense electrical double layer (EDL). The structure of this EDL has important consequences in numerous applications involving ILs, for example, in supercapacitors, sensors, and lubricants, by impacting the interfacial capacitance, the charge carrier density of semiconductors, as well as the frictional properties of the interfaces. We have studied the interfacial structure of a long chain imidazolium-based IL (1-octyl-3-methylimidazolium dicyanamide) on several substrates: mica, silica, silicon, and molybdenum disulfide (MoS2), using atomic force microscopy (AFM) experiments and molecular dynamics (MD) simulations. We have observed 3 types of interfacial structures for the same IL, depending on the chemistry of the substrate and the water content, showing that the EDL structure is not an intrinsic property of the IL. We evidenced that at a low water content, neutral and apolar (thus hydrophobic) substrates promote a thin layer structure, where the ions are oriented parallel to the substrate and cations and anions are mixed in each layer. In contrast, a strongly charged (thus hydrophilic) substrate yields an extended structuration into several bilayers, while a heterogeneous layering with loose bilayer regions was observed on an intermediate polar and weakly charged substrate and on an apolar one at a high bulk water content. In the latter case, water contamination favors the formation of bilayer patches by promoting the segregation of the long chain IL into polar and apolar domains.
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Affiliation(s)
- Layla Bou Tannous
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, 69364 Lyon, France
- CEA, Leti, Univ. Grenoble Alpes, F-38000 Grenoble, France
| | | | - Zheng Gong
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, 69364 Lyon, France
| | | | - Anass Benayad
- CEA, Liten, Univ. Grenoble Alpes, F-38000 Grenoble, France
| | - Agilio A H Padua
- Laboratoire de Chimie, École Normale Supérieure de Lyon, CNRS, 69364 Lyon, France
| | - Audrey Steinberger
- Univ Lyon, ENS de Lyon, CNRS, Laboratoire de Physique, F-69342 Lyon, France
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2
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Tan S, Nguyen MT, Zhang D, Zhong L, Cheng Z, China S, Johnson GE, Prabhakaran V. Electric-Field-Induced Assembly of an Ionic Liquid-Water Interphase Enables Efficient Heavy Metal Electrosorption. ACS APPLIED MATERIALS & INTERFACES 2023; 15:44469-44481. [PMID: 37676918 DOI: 10.1021/acsami.3c07465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
Controlling ion desolvation, transport, and charge transfer at the electrode-electrolyte interface (EEI) is critical to enable the rational design of the efficient and selective separation of targeted heavy metals and the decontamination of industrial wastewater. The main challenge is to sufficiently resolve and interrogate the desolvation of solvated metal ions and their subsequent electroreduction at the EEI and establish pathways to modulate these intermediate steps to achieve efficient energy transfer for targeted reactive separations. Herein, we obtained a predictive understanding of modulating the desolvation and electrosorption of Pb2+ cations using the hydrophobic ionic liquid 1-ethyl-3-methylimidazolium chloride (EMIMCl) in aqueous electrolyte. We revealed the formation of a compact interphase layer consisting of EMIMCl-Pb complexes under an applied electric field using operando electrochemical Raman spectroscopy, atomic force microscopy, and electrochemical impedance spectroscopy measurements combined with classical molecular dynamics simulations. A lower negative potential was shown to result in the formation of a well-oriented layer with the positive imidazolium ring of EMIMCl lying perpendicular to the electrode and the hydrophobic alkyl chain extending into the bulk electrolyte. This oriented layer, which formed from a dilute concentration of EMIMCl added to the electrolyte, was demonstrated to facilitate desolvation of incoming solvated Pb2+ cations and decrease the charge transfer resistance for Pb electrodeposition, which has important implications for the selective removal of Pb from contaminated mixtures. Overall, our findings open up new opportunities to modulate ion desolvation using hydrophobic ionic liquids in aqueous electrolytes for efficient heavy-metal separation.
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Affiliation(s)
- Shuai Tan
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Manh-Thuong Nguyen
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Difan Zhang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Lirong Zhong
- Energy and Environmental Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Zezhen Cheng
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Swarup China
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Grant E Johnson
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Venkateshkumar Prabhakaran
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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3
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Zhu G, Ren B, Zhou Q, Xiong J, Ma X, Zhao L, Jiang F, Yang X, Wang S. Outstanding Performance of the Deep Eutectic Solvent-Based Aqueous Biphasic System Constructed with Sodium Citrate for a Green Gold Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 37366178 DOI: 10.1021/acs.langmuir.3c01076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Aqueous biphasic systems (ABSs) that are based on deep eutectic solvents (DESs) are environmentally benign systems to use for metal ion separation. In this work, a series of DESs was synthesized for the first time with PEG 400 as hydrogen bond donors and tetrabutylphonium bromide (P4Br), tetrabutylammonium bromide (N4Br), or tetrabutylammonium chloride (N4Cl) as hydrogen bond acceptors, and then they were combined with citrate (Na3C6H5O7), which is eco-friendly, to construct an ABS for use in the separation of Au(I) from an aurocyanide solution. Phase diagrams of DESs + Na3C6H5O7 + H2O systems were constructed using the experimentally measured data. Multiple factors that affect the efficiency of the gold extraction were studied; these factors were the species of salt or DES and their content, the equilibrium pH, the oscillation time, and the initial gold concentration. Gold(I) is preferentially retained in the DES-rich phase, and the P4Br:PEG 1:2 + Na3C6H5O7 + H2O system has a high extraction efficiency of 100.0% under optimized conditions. FT-IR, NMR, and TEM characterizations and DFT calculations show that the migration of Au(I) from the salt-rich to the DES-rich phase follows an ion exchange mechanism. Specifically, Au(CN)2- replaces Br- in the original P4Br and generates a stable ion pair with the quaternary phosphonium salt cation, P+, and this replacement is driven by electrostatic attractions. A new strong hydrogen bond network simultaneously forms between the anionic Au(CN)2- and the -OH group in the PEG 400 component. Finally, the gold of Au(I)-loaded P4Br:PEG 1:2 can be successfully reduced by sodium borohydride with an efficiency of 100.0%. The strategy to extract gold(I) from alkaline cyanide solutions using an ABS based on DESs as proposed in this work provides a potential platform for developing green technology for recovering gold.
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Affiliation(s)
- Guiping Zhu
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Boxian Ren
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Qiaoshu Zhou
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Jiaxing Xiong
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Xiaoyu Ma
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Lingling Zhao
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Fengzhi Jiang
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Xiangjun Yang
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
| | - Shixiong Wang
- Research Center of Lake Restoration Technology Engineering for Universities of Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, China
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Zhang Y, Marlow JB, Millar W, Silvester DS, Warr GG, Li H, Atkin R. Effect of ion structure on the nanostructure and electrochemistry of surface active ionic liquids. J Colloid Interface Sci 2023; 630:931-939. [DOI: 10.1016/j.jcis.2022.10.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/29/2022] [Accepted: 10/16/2022] [Indexed: 11/05/2022]
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5
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Stephens NM, Smith EA. Structure of Deep Eutectic Solvents (DESs): What We Know, What We Want to Know, and Why We Need to Know It. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:14017-14024. [PMID: 36346803 DOI: 10.1021/acs.langmuir.2c02116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Deep eutectic solvents (DESs) are a tunable class of solvents with many advantageous properties including good thermal stability, facile synthesis, low vapor pressure, and low-to-negligible toxicity. DESs are composed of hydrogen bond donors and acceptors that, when combined, significantly decrease the freezing point of the resulting solvent. DESs have distinct interfacial and bulk structural heterogeneity compared to traditional solvents, in part due to various intramolecular and intermolecular interactions. Many of the physiochemical properties observed for DESs are influenced by structure. However, our understanding of the interfacial and bulk structure of DESs is incomplete. To fully exploit these solvents in a range of applications including catalysis, separations, and electrochemistry, a better understanding of DES structure must be obtained. In this Perspective, we provide an overview of the current knowledge of the interfacial and bulk structure of DESs and suggest future research directions to improve our understanding of this important information.
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Affiliation(s)
- Nicole M Stephens
- Ames National Laboratory, U.S. Department of Energy, Ames, Iowa 50011-3111, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011-3111, United States
| | - Emily A Smith
- Ames National Laboratory, U.S. Department of Energy, Ames, Iowa 50011-3111, United States
- Department of Chemistry, Iowa State University, Ames, Iowa 50011-3111, United States
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6
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Wan Z, Azam MS, Wyatt S, Ramsay K, Korner JL, Elvira KS, Padmawar R, Varela D, Hore DK. Algae Adhesion onto Silicone is Sensitive to Environment-Induced Surface Restructuring. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9597-9604. [PMID: 34328000 DOI: 10.1021/acs.langmuir.1c01493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Resistance to algae contamination is an important characteristic of insulators used in overhead power distribution in coastal environments. It is therefore important to understand the parameters governing algae adhesion onto polymer insulator materials such as silicone. Flow cell-based shear experiments were conducted in order to characterize the adhesion strength of algae onto polydimethylsiloxane surfaces, comparing fresh polymer substrates with those that have been soaked in water and saline solutions for 1 month. Both freshwater algae and seawater species could withstand considerably less drag force and were therefore more easily removed when the polymer was soaked in salt water. The polymer surface was found to be unaltered in terms of its roughness, contact angle, and lack of water uptake; no macroscopic surface characterization was therefore able to account for the differences in cell adhesion strength resulting from the soaking treatment. Surface-specific nonlinear vibrational spectroscopy, however, revealed subtle differences in the orientation of surface methyl groups that resulted from the water and saline exposure.
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Affiliation(s)
- Zhijing Wan
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, British Columbia, Canada
| | - Md Shafiul Azam
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, British Columbia, Canada
| | - Shea Wyatt
- Department of Biology, University of Victoria, Victoria V8W 2Y2, British Columbia, Canada
| | - Kaitlyn Ramsay
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, British Columbia, Canada
| | - Jaime L Korner
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, British Columbia, Canada
| | - Katherine S Elvira
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, British Columbia, Canada
| | - Rajkumar Padmawar
- ASAsoft (Canada) Inc., 179-2945 Jacklin Road Suite 221, Victoria V9B 6J9, British Columbia, Canada
| | - Diana Varela
- Department of Biology, University of Victoria, Victoria V8W 2Y2, British Columbia, Canada
- School of Earth and Ocean Sciences, University of Victoria, Victoria V8W 2Y2, British Columbia, Canada
| | - Dennis K Hore
- Department of Chemistry, University of Victoria, Victoria V8W 3V6, British Columbia, Canada
- Department of Computer Science, University of Victoria, Victoria V8W 3P6, British Columbia, Canada
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7
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Tsyrenova A, Farooq MQ, Anthony SM, Mollaeian K, Li Y, Liu F, Miller K, Ren J, Anderson JL, Jiang S. Unique Orientation of the Solid-Solid Interface at the Janus Particle Boundary Induced by Ionic Liquids. J Phys Chem Lett 2020; 11:9834-9841. [PMID: 33170707 DOI: 10.1021/acs.jpclett.0c02813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
This study reveals the unique role on Janus particles of the solid-solid interface at the boundary in determining particle interactions and assembly. In an aqueous ionic liquid (IL) solution, Janus spheres adopt intriguing orientations with their boundaries pinned on the glass substrate. It was further discovered that the orientation was affected by the particle amphiphilicity as well as the chemical structure and concentration of the IL. Further characterization suggests that the adsorption on the hydrophilic side is due to both an electrostatic interaction and hydrogen bonding, while adsorption on the hydrophobic side is due to hydrophobic attraction. Through the concerted interplay of all these interactions, the amphiphilic boundary may attract an excessive amount of IL cations, which guide the unique orientations of the Janus spheres. The results highlight the importance of the Janus boundary that has not been recognized previously. Adsorption at the solid-solid interfaces may inspire new applications in areas such as separation and catalysis.
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Affiliation(s)
- Ayuna Tsyrenova
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Muhammad Q Farooq
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Stephen M Anthony
- Department of Computational Biology and Biophysics, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States
| | - Keyvan Mollaeian
- Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Yifan Li
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Fei Liu
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Kyle Miller
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Juan Ren
- Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Jared L Anderson
- Department of Chemistry, Iowa State University, Ames, Iowa 50011, United States
| | - Shan Jiang
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
- Division of Materials Science & Engineering, Ames National Laboratory, Ames, Iowa 50011, United States
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Sieling T, Brand I. In Situ Spectroelectrochemical Investigation of Potential‐Dependent Changes in an Amphiphilic Imidazolium‐Based Ionic Liquid Film on the Au(111) Electrode Surface. ChemElectroChem 2020. [DOI: 10.1002/celc.202000385] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Thorben Sieling
- University of Oldenburg, Department of Chemistry 26111 Oldenburg Germany
| | - Izabella Brand
- University of Oldenburg, Department of Chemistry 26111 Oldenburg Germany
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9
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Ludwig M, von Klitzing R. Recent progress in measurements of oscillatory forces and liquid properties under confinement. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2020.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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10
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Weiss H, Cheng HW, Mars J, Li H, Merola C, Renner FU, Honkimäki V, Valtiner M, Mezger M. Structure and Dynamics of Confined Liquids: Challenges and Perspectives for the X-ray Surface Forces Apparatus. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:16679-16692. [PMID: 31614087 PMCID: PMC6933819 DOI: 10.1021/acs.langmuir.9b01215] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 10/15/2019] [Indexed: 05/21/2023]
Abstract
The molecular-scale structure and dynamics of confined liquids has increasingly gained relevance for applications in nanotechnology. Thus, a detailed knowledge of the structure of confined liquids on molecular length scales is of great interest for fundamental and applied sciences. To study confined structures under dynamic conditions, we constructed an in situ X-ray surface forces apparatus (X-SFA). This novel device can create a precisely controlled slit-pore confinement down to dimensions on the 10 nm scale by using a cylinder-on-flat geometry for the first time. Complementary structural information can be obtained by simultaneous force measurements and X-ray scattering experiments. The in-plane structure of liquids parallel to the slit pore and density profiles perpendicular to the confining interfaces are studied by X-ray scattering and reflectivity. The normal load between the opposing interfaces can be modulated to study the structural dynamics of confined liquids. The confinement gap distance is tracked simultaneously with nanometer precision by analyzing optical interference fringes of equal chromatic order. Relaxation processes can be studied by driving the system out of equilibrium by shear stress or compression/decompression cycles of the slit pore. The capability of the new device is demonstrated on the liquid crystal 4'-octyl-4-cyano-biphenyl (8CB) in its smectic A (SmA) mesophase. Its molecular-scale structure and orientation confined in 100 nm to 1.7 μm slit pores was studied under static and dynamic nonequilibrium conditions.
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Affiliation(s)
- Henning Weiss
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Hsiu-Wei Cheng
- Institute
of Applied Physics, Vienna Institute of
Technology, Wiedner Hauptstrasse 8-10/E134, 1040 Wien, Austria
| | - Julian Mars
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute
of Physics, Johannes Gutenberg University
Mainz, 55128 Mainz, Germany
| | - Hailong Li
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Claudia Merola
- Institute
of Applied Physics, Vienna Institute of
Technology, Wiedner Hauptstrasse 8-10/E134, 1040 Wien, Austria
| | - Frank Uwe Renner
- Institute
for Materials Research, Hasselt University, 3590 Diepenbeek, Belgium
| | - Veijo Honkimäki
- ESRF-European
Synchrotron Radiation Facility, Avenue des Martyrs 71, 38043 Grenoble, Cedex 9, France
| | - Markus Valtiner
- Institute
of Applied Physics, Vienna Institute of
Technology, Wiedner Hauptstrasse 8-10/E134, 1040 Wien, Austria
- Max-Planck-Institut
für Eisenforschung GmbH, Max-Planck-Strasse 1, 40237 Düsseldorf, Germany
| | - Markus Mezger
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Institute
of Physics, Johannes Gutenberg University
Mainz, 55128 Mainz, Germany
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Adibnia V, Mirbagheri M, Latreille PL, De Crescenzo G, Rochefort D, Banquy X. Interfacial Forces across Ionic Liquid Solutions: Effects of Ion Concentration and Water Domains †. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15585-15591. [PMID: 31333025 DOI: 10.1021/acs.langmuir.9b02011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Using the surface force apparatus (SFA), the interaction forces between mica surfaces across ionic liquid (IL) solutions are studied. The IL solution, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide in propylene carbonate solvent, is used at different concentrations to elucidate the ions' conformation at the interface from the analysis of short-range structural forces. A direct correlation between the ion layer thickness at the interface and the IL molar fraction in the solution is observed, suggesting conformational changes relative to the ion packing density. In addition, effects of large microscopic and macroscopic water domains at the interface are investigated. The microscopic water domains induced significant adhesion at contact because of the long-range capillary forces, which are found to depend on solvent concentration. The macroscopic water domains entirely cover the interaction area, ensuring that the long-range interfacial interactions occur entirely across the aqueous electrolyte solution with dissolved IL ions as the electrolyte. These results help elucidate the interfacial interactions in IL-charged solid interfaces with practical importance in green energy storage, catalysis, and lubrication.
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Affiliation(s)
- Vahid Adibnia
- Faculty of Pharmacy , Université de Montréal , 2900 Édouard-Montpetit , Montreal H3C 3J7 , Canada
- Department of Chemical Engineering , Ecole Polytechnique de Montreal , P.O. Box 6079, Succursale Centre-Ville, Montreal H3C 3A7 , Canada
| | - Marziye Mirbagheri
- Faculty of Pharmacy , Université de Montréal , 2900 Édouard-Montpetit , Montreal H3C 3J7 , Canada
- Department of Chemical Engineering , Ecole Polytechnique de Montreal , P.O. Box 6079, Succursale Centre-Ville, Montreal H3C 3A7 , Canada
| | - Pierre-Luc Latreille
- Faculty of Pharmacy , Université de Montréal , 2900 Édouard-Montpetit , Montreal H3C 3J7 , Canada
| | - Gregory De Crescenzo
- Department of Chemical Engineering , Ecole Polytechnique de Montreal , P.O. Box 6079, Succursale Centre-Ville, Montreal H3C 3A7 , Canada
| | - Dominic Rochefort
- Department of Chemistry , Université de Montréal , CP6128 Succursale Centre-Ville , Montreal H3C 3J7 , Canada
| | - Xavier Banquy
- Faculty of Pharmacy , Université de Montréal , 2900 Édouard-Montpetit , Montreal H3C 3J7 , Canada
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12
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Abstract
Ionic liquids have become of significant relevance in chemistry, as they can serve as environmentally-friendly solvents, electrolytes, and lubricants with bespoke properties. In particular for electrochemical applications, an understanding of the interface structure between the ionic liquid and an electrified interface is needed to model and optimize the reactions taking place on the solid surface. As with ionic liquids, the interplay between electrostatic forces and steric effects leads to an intrinsic heterogeneity, as the structure of the ionic liquid above an electrified interface cannot be described by the classical electrical double layer model. Instead, a layered solvation layer is present with a structure that depends on the material combination of the ionic liquid and substrate. In order to experimentally monitor this structure, atomic force spectroscopy (AFS) has become the method of choice. By measuring the force acting on a sharp microfabricated tip while approaching the surface in an ionic liquid, it has become possible to map the solvation layers with sub-nanometer resolution. In this review, we provide an overview of the AFS studies on ionic liquids published in recent years that illustrate how the interface is formed and how it can be modified by applying electrical potential or by adding impurities and solvents.
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13
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Schindl A, Hagen ML, Muzammal S, Gunasekera HAD, Croft AK. Proteins in Ionic Liquids: Reactions, Applications, and Futures. Front Chem 2019; 7:347. [PMID: 31179267 PMCID: PMC6543490 DOI: 10.3389/fchem.2019.00347] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 04/26/2019] [Indexed: 01/01/2023] Open
Abstract
Biopolymer processing and handling is greatly facilitated by the use of ionic liquids, given the increased solubility, and in some cases, structural stability imparted to these molecules. Focussing on proteins, we highlight here not just the key drivers behind protein-ionic liquid interactions that facilitate these functionalities, but address relevant current and potential applications of protein-ionic liquid interactions, including areas of future interest.
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Affiliation(s)
- Alexandra Schindl
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
- Faculty of Medicine & Health Sciences, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom
- Faculty of Science, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom
| | - Matthew L. Hagen
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
- Centre for Additive Manufacturing, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
| | - Shafaq Muzammal
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
| | - Henadira A. D. Gunasekera
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
- Centre for Additive Manufacturing, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
| | - Anna K. Croft
- Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham, Nottingham, United Kingdom
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14
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Thermodynamic insights and molecular environments into catanionic surfactant systems: Influence of chain length and molar ratio. J Colloid Interface Sci 2019; 548:77-87. [PMID: 30981965 DOI: 10.1016/j.jcis.2019.04.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 04/05/2019] [Accepted: 04/07/2019] [Indexed: 01/09/2023]
Abstract
HYPOTHESIS Imidazolium-based Ionic liquids as new generation cationic surfactants can provide designable alkyl chain length. In the catanionic surfactant systems, the alkyl chain lengths and molar ratios can greatly influence the interactions such as electrostatic and hydrophobic interaction. The variation in these interactions has a significant effect on the molecular environments of the self-assembly structure, and this process is always accompanied by the transition of aggregates and release or consumption of heat. Hence, it is of interest to study the relationship between intermolecular interactions, molecular environments, self-assembly structure and the change in energy of system in the catanionic surfactant mixed systems. EXPERIMENTS The enthalpy change ΔH of titrations the imidazolium-based into SDS micelle solution was studied to characterize the heat by using isothermal titration calorimetry (ITC) during the transitions of the aggregate structures. The corresponding self-assembly structure was monitored via cryogenic transmission electron microscopy (cryo-TEM). Employing proton magnetic resonance (1H NMR), we focus on the interactions between imidazolium-based ILs and SDS based on the variations in the molecular environments of aggregates. FINDINGS Of these imidazolium-based ionic liquids/SDS system, the 1-octyl-3-methylimidazolium ([OMIM]Cl)/SDS system shows several features such as intense energy absorption and releasing processes, which indicate the formation of high entanglement wormlike micelles and vesicles. This is related to the formation of self-adjusting state between the SDS and [OMIM]Cl molecules due to the balance between the electrostatic interaction and hydrophobic interaction. Varying the alkyl chain length appears to cause significant differences to the molecular environments. From the molecular environments, three different models about the polarity of the catanionic surfactant molecules are used to explain the balance of the intermolecular interactions.
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Radiom M. Ionic liquid–solid interface and applications in lubrication and energy storage. Curr Opin Colloid Interface Sci 2019. [DOI: 10.1016/j.cocis.2019.01.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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16
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Dib N, Silber JJ, Correa NM, Falcone RD. Combination of a protic ionic liquid-like surfactant and biocompatible solvents to generate environmentally friendly anionic reverse micelles. NEW J CHEM 2019. [DOI: 10.1039/c9nj02268f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
imim–DEHP, a versatile protic IL-like surfactant to formulate aqueous RMs in biocompatible non-polar solvents.
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Affiliation(s)
- Nahir Dib
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)
- CONICET-UNRC
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C. P. X5804BYA Río Cuarto
| | - Juana J. Silber
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)
- CONICET-UNRC
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C. P. X5804BYA Río Cuarto
| | - N. Mariano Correa
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)
- CONICET-UNRC
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C. P. X5804BYA Río Cuarto
| | - R. Dario Falcone
- Instituto para el Desarrollo Agroindustrial y de la Salud (IDAS)
- CONICET-UNRC
- Departamento de Química
- Universidad Nacional de Río Cuarto
- C. P. X5804BYA Río Cuarto
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Singh G, Kaur M, Shiekh BA, Kang TS. Luminescent micellar nano-interfaces of surface active ionic liquid for the selective recognition of ADP in aqueous medium. Chem Commun (Camb) 2018; 54:7463-7466. [DOI: 10.1039/c8cc02985g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Selective recognition of ADP by the micellar nano-interfaces of SAIL is observed whereas monomers/bilayers are not sensitive towards ADP.
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Affiliation(s)
- G. Singh
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| | - M. Kaur
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| | - B. A. Shiekh
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| | - T. S. Kang
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
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