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Di Pietro ME, Castiglione F, Mele A. Polar/apolar domains' dynamics in alkylimidazolium ionic liquids unveiled by the dual receiver NMR 1H and 19F relaxation experiment. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114567] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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3
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Zhang Y, Xu X. Solubility predictions through LSBoost for supercritical carbon dioxide in ionic liquids. NEW J CHEM 2020. [DOI: 10.1039/d0nj03868g] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The LSBoost model is developed to predict the solubility of supercritical carbon dioxide in 24 ionic liquids by using critical properties and biphasic system parameters as descriptors. The model is highly accurate and stable.
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Affiliation(s)
- Yun Zhang
- North Carolina State University
- Raleigh
- USA
| | - Xiaojie Xu
- North Carolina State University
- Raleigh
- USA
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4
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Singh S, Nanda R, Dorai K. Structural and dynamical aspects of PEG/LiClO 4 in solvent mixtures via NMR spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:412-422. [PMID: 30883938 DOI: 10.1002/mrc.4867] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 01/08/2019] [Accepted: 03/10/2019] [Indexed: 06/09/2023]
Abstract
Motivated by the potential usefulness of polyethylene glycol (PEG)/Li+ salt mixtures in several industrial applications, we investigated the structure and dynamics of PEG/LiClO4 mixtures in D2 O and its mixtures with CD3 CN and DMSO-d6 , in a series of PEG-based polymers with a wide variation in their molecular weights. 1 H NMR chemical shifts, T1 /T2 relaxation rates, pulsed-field gradient NMR diffusion experiments, and 2D HOESY NMR studies have been performed to understand the structural and dynamical aspects of these mixtures. Increasing the temperature of the medium results in a significant perturbation in the H-bonded structure of PEG in its PEG/LiClO4 /D2 O mixtures as observed from the increase in chemical shifts. On the other hand, the addition of molecular cosolvents has a negligible effect. The hydrodynamic structure of PEG shows a pronounced variation at low temperature with increasing molecular weight, which, however, disappears at higher temperatures. Increasing the temperature leads to a decrease in the hydrodynamic structure of PEG, which can be explained on the basis of solvation-desolvation phenomena. The 2D HOESY NMR spectra reveal a new finding of Li+ -water binding in the PEG/LiClO4 /D2 O mixtures with the addition of molecular solvents, suggesting that the Li+ cation diffuses freely in the D2 O mixtures of polymers as compared with the polymer mixtures with DMSO or CD3 CN.
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Affiliation(s)
- Satnam Singh
- Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
| | - Raju Nanda
- Department of Chemistry, Michigan State University, East Lansing, MI
| | - Kavita Dorai
- Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
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Lépori CMO, Correa NM, Silber JJ, Vaca Chávez F, Falcone RD. Interfacial properties modulated by the water confinement in reverse micelles created by the ionic liquid-like surfactant bmim-AOT. SOFT MATTER 2019; 15:947-955. [PMID: 30644504 DOI: 10.1039/c8sm02217h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The behavior of the interfacial water entrapped in reverse micelles (RMs) that were formed by the ionic liquid-like surfactant 1-butyl-3-methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate (bmim-AOT) was investigated with the use of UV-Vis absorption spectroscopy and nuclear magnetic resonance (NMR) relaxometry. The solvatochromism of two molecular probes, namely, 1-methyl-8-oxyquinolinium betaine (QB) and N,N,N',N'-tetramethylethylenediamine copper(ii)acetylacetonate tetraphenylborate ([Cu(acac)(tmen)][B(C6H5)4]), was investigated. As a comparison, the analog RMs formed by sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) were also explored. By varying the water content inside the RMs and consequently the different magnitude of the water-surfactant interactions at the interface, interesting properties were observed by comparing bmim-AOT and Na-AOT RMs. From the solvatochromic behavior of ([Cu(acac)(tmen)][B(C6H5)4]), we found that the interface in bmim-AOT RMs shows a smaller electron donating capacity than that in Na-AOT RMs. QB revealed that the interfacial region is a weaker hydrogen bond donor and less polar than the corresponding Na-AOT RMs. NMR experiments showed that the molecular motion of water in bmim-AOT RMs is less restricted than that of the water molecules confined in Na-AOT RMs. In summary, the results show how the nature of the bmim+ cation affects the interaction between the entrapped water and the RM interface, greatly modifying the interfacial water structure in comparison with the results known for Na-AOT.
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Affiliation(s)
- Cristian M O Lépori
- Departamento de Química, Universidad Nacional de Río Cuarto, Agencia Postal # 3, C.P. X5804BYA Río Cuarto, Argentina.
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Köcher SS, Düwel S, Hundshammer C, Glaser SJ, Schilling F, Granwehr J, Scheurer C. Ab Initio Simulation of pH-Sensitive Biomarkers in Magnetic Resonance Imaging. J Phys Chem A 2018; 122:7983-7990. [PMID: 30222345 DOI: 10.1021/acs.jpca.8b04665] [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
An ab initio simulation scheme is introduced as a theoretical prescreening approach to facilitate and enhance the research for pH-sensitive biomarkers. The proton 1H and carbon 13C nuclear magnetic resonance (NMR) chemical shifts of the recently published marker for extracellular pH, [1,5-13C2]zymonic acid (ZA), and the as yet unpublished ( Z)-4-methyl-2-oxopent-3-enedioic acid (OMPD) were calculated with ab initio methods as a function of the pH. The influence of the aqueous solvent was taken into account either by an implicit solvent model or by explicit water molecules, where the latter improved the accuracy of the calculated chemical shifts considerably. The theoretically predicted chemical shifts allowed for a reliable NMR peak assignment. The p Ka value of the first deprotonation of ZA and OMPD was simulated successfully whereas the parametrization of the implicit solvent model does not allow for an accurate description of the second p Ka. The theoretical models reproduce the pH-induced chemical shift changes and the first p Ka with sufficient accuracy to establish the ab initio prescreening approach as a valuable support to guide the experimental search for pH-sensitive biomarkers.
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Affiliation(s)
- Simone S Köcher
- Chair for Theoretical Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstr. 4 , D-85747 Garching , Germany.,Institute of Energy and Climate Research (IEK-9) , Forschungszentrum Jülich , D-52425 Jülich , Germany.,Institute of Technical and Macromolecular Chemistry , RWTH Aachen University , Worringerweg 1-2 , D-52074 Aachen , Germany
| | - Stephan Düwel
- Department of Nuclear Medicine, Klinikum rechts der Isar , Technische Universität München , Ismaninger Str. 22 , D-81675 München , Germany.,Department of Chemistry , Technische Universität München , Lichtenbergstr. 4 , D-85747 Garching , Germany.,Munich School of BioEngineering , Technische Universität München , Boltzmannstr. 11 , D-85748 Garching , Germany
| | - Christian Hundshammer
- Department of Nuclear Medicine, Klinikum rechts der Isar , Technische Universität München , Ismaninger Str. 22 , D-81675 München , Germany.,Department of Chemistry , Technische Universität München , Lichtenbergstr. 4 , D-85747 Garching , Germany
| | - Steffen J Glaser
- Department of Chemistry , Technische Universität München , Lichtenbergstr. 4 , D-85747 Garching , Germany
| | - Franz Schilling
- Department of Nuclear Medicine, Klinikum rechts der Isar , Technische Universität München , Ismaninger Str. 22 , D-81675 München , Germany
| | - Josef Granwehr
- Institute of Energy and Climate Research (IEK-9) , Forschungszentrum Jülich , D-52425 Jülich , Germany.,Institute of Technical and Macromolecular Chemistry , RWTH Aachen University , Worringerweg 1-2 , D-52074 Aachen , Germany
| | - Christoph Scheurer
- Chair for Theoretical Chemistry and Catalysis Research Center , Technische Universität München , Lichtenbergstr. 4 , D-85747 Garching , Germany
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Panja SK, Saha S. Microheterogeneity in imidazolium and piperidinium cation-based ionic liquids: 1D and 2D NMR studies. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:95-102. [PMID: 28503908 DOI: 10.1002/mrc.4610] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 04/20/2017] [Accepted: 05/08/2017] [Indexed: 06/07/2023]
Abstract
Existence of microheterogeneity of imidazolium and piperidinium cation-based ionic liquids (ILs) containing PF6 and NTf2 anions has been investigated by 1D and 2D NMR spectroscopy. 2D NMR (especially NOESY and HOESY) has been employed for studying the interactions present between cation and anion as well as the intermolecular interaction among cations. HOESY spectrum shows that fluorine of anion ( PF6- and NTf2-) significantly interacts with proton of the cations. Combined results of HOESY and NOESY for imidazolium IL indicate that the PF6- and imidazolium cation are distributed in organized manner, resulting a heterogeneous environment in liquid state. We have also observed existence of heterogeneous environment for piperidinium cation-based ILs which is different from imidazolium ILs. It appears that existence of microheterogeneity in IL is ubiquitous and therefore open up the ILs field to revisit. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Sumit Kumar Panja
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Satyen Saha
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
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Nanda R, Damodaran K. A review of NMR methods used in the study of the structure and dynamics of ionic liquids. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:62-72. [PMID: 28921712 DOI: 10.1002/mrc.4666] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 08/16/2017] [Accepted: 09/08/2017] [Indexed: 06/07/2023]
Abstract
Recently, NMR spectroscopy has been emerging out as a powerful tool to study the structure and dynamics of ionic liquids (ILs) and ILs-Li+ salt mixtures. This mini-review primarily focuses on the applications of various NMR spectroscopic techniques such as self-diffusion measurements, NMR relaxometry, two-dimensional NMR, and other novel NMR approaches to study the structure and dynamics of ILs and its mixtures with lithium salts. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- R Nanda
- Department of Chemistry, Michigan State University, East Lansing, MI, 48824, USA
| | - Krishnan Damodaran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
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Xu J, Deng H, Fu Y, Chen Y, Zhang J, Hou W. Surfactant-free microemulsions of 1-butyl-3-methylimidazolium hexafluorophosphate, propylamine nitrate, and water. SOFT MATTER 2017; 13:2067-2074. [PMID: 28217785 DOI: 10.1039/c7sm00155j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Generally, surfactants (or amphiphiles) are believed to be necessary components of microemulsions. However, it has been demonstrated that, in the absence of traditional surfactants, microemulsions can also form from a ternary system of two immiscible fluids (i.e., oil and water phases) and an amphi-solvent, but the current understanding of such surfactant-free microemulsions (SFMEs) is very limited. Herein, we report an SFME consisting of the hydrophobic ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6), the protic IL propylamine nitrate (PAN), and water, in which bmimPF6 and PAN are used as the oil phase and the amphi-solvent, respectively. The microstructures and structural transitions of the SFME were investigated using cyclic voltammetry, fluorescence spectroscopy, and ultraviolet-visible spectroscopy. The SFME exhibited water-in-bmimPF6 (W/IL), bicontinuous (BC), and bmimPF6-in-water (IL/W) microstructures, depending on the composition of the ternary system, similar to the case of traditional surfactant-based microemulsions (SBMEs). The three kinds of microstructures were confirmed by cryogenic transmission electron microscopy (cryo-TEM) observations. To the best of our knowledge, this is the first report on SFMEs composed of two ILs as components, especially where one is used as the amphi-solvent.
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Affiliation(s)
- Jie Xu
- State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Huanhuan Deng
- State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Yunlei Fu
- State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Yuquan Chen
- State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Jing Zhang
- State Key Laboratory Base of Eco-chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Wanguo Hou
- Key Laboratory of Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, P. R. China.
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Tomé LC, Gouveia ASL, Ab Ranii MA, Lickiss PD, Welton T, Marrucho IM. Study on Gas Permeation and CO2 Separation through Ionic Liquid-Based Membranes with Siloxane-Functionalized Cations. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04661] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Liliana C. Tomé
- Instituto de Tecnologia
Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Andreia S. L. Gouveia
- Instituto de Tecnologia
Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Mohd A. Ab Ranii
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Paul D. Lickiss
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Tom Welton
- Department of Chemistry, Imperial College London, London SW7 2AZ, United Kingdom
| | - Isabel M. Marrucho
- Instituto de Tecnologia
Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
- Centro de Química Estrutural, Instituto
Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
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Kuchlyan J, Kundu N, sarkar N. Ionic liquids in microemulsions: Formulation and characterization. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.05.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Nuclear magnetic resonance, fluorescence correlation spectroscopy and time-resolved fluorescence anisotropy studies of intermolecular interactions in bis(1-methyl-1H-imidazol-3-ium-3-yl)dihydroborate bis(trifluoromethylsulfonyl)amide and its mixtures with various cosolvents. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.08.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Thawarkar S, Khupse ND, Kumar A. Comparative Investigation of the Ionicity of Aprotic and Protic Ionic Liquids in Molecular Solvents by using Conductometry and NMR Spectroscopy. Chemphyschem 2016; 17:1006-17. [DOI: 10.1002/cphc.201501156] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Sachin Thawarkar
- Physical and Materials Chemistry Division; CSIR-National Chemical Laboratory; Pune 411 008 India
| | - Nageshwar D. Khupse
- Physical and Materials Chemistry Division; CSIR-National Chemical Laboratory; Pune 411 008 India
| | - Anil Kumar
- Physical and Materials Chemistry Division; CSIR-National Chemical Laboratory; Pune 411 008 India
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Nanda R. Thermal dynamics of lithium salt mixtures of ionic liquid in water by PGSE NMR spectroscopy. RSC Adv 2016. [DOI: 10.1039/c6ra00891g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The dynamics of ionic liquid–H2O–Li+ salt mixtures have been studied through PGSE NMR spectroscopy.
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Affiliation(s)
- Raju Nanda
- School of Chemical Sciences
- National Institute of Science Education and Research
- Bhubaneswar-751005
- India
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Nanda R. Unusual linear dependency of viscosity with temperature in ionic liquid/water mixtures. Phys Chem Chem Phys 2016; 18:25801-25805. [DOI: 10.1039/c6cp05257f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The unusual linear scaling of the self-diffusion coefficient and viscosity leads to the violation of the SE and FSE equations and shows dynamic heterogeneity.
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Affiliation(s)
- R. Nanda
- Department of Physical Science
- Indian Institute of Science Education and Research
- Mohali
- India
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Nanda R, Rajamohanan PR, Kumar A. Experimental Signature of Microheterogeneity in Ionic Liquid-H2O Systems and Their Perturbation by Adding Li+Salts: A Pulsed Gradient Spin-Echo NMR Approach. Chemphyschem 2015; 16:2936-41. [DOI: 10.1002/cphc.201500503] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Indexed: 11/05/2022]
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Roy B, Satpathi S, Gavvala K, Koninti RK, Hazra P. Solvation Dynamics in Different Phases of the Lyotropic Liquid Crystalline System. J Phys Chem B 2015; 119:11721-31. [PMID: 26258397 DOI: 10.1021/acs.jpcb.5b04370] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Reverse hexagonal (HII) liquid crystalline material based on glycerol monooleate (GMO) is considered as a potential carrier for drugs and other important biomolecules due to its thermotropic phase change and excellent morphology. In this work, the dynamics of encapsulated water, which plays important role in stabilization and formation of reverse hexagonal mesophase, has been investigated by time dependent Stokes shift method using Coumarin-343 as a solvation probe. The formation of the reverse hexagonal mesophase (HII) and transformation to the L2 phase have been monitored using small-angle X-ray scattering and polarized light microscopy experiments. REES studies suggest the existence of different polar regions in both HII and L2 systems. The solvation dynamics study inside the reverse hexagonal (HII) phase reveals the existence of two different types of water molecules exhibiting dynamics on a 120-900 ps time scale. The estimated diffusion coefficients of both types of water molecules obtained from the observed dynamics are in good agreement with the measured diffusion coefficient collected from the NMR study. The calculated activation energy is found to be 2.05 kcal/mol, which is associated with coupled rotational-translational water relaxation dynamics upon the transition from "bound" to "quasi-free" state. The observed ∼2 ns faster dynamics of the L2 phase compared to the HII phase may be associated with both the phase transformation as well as thermotropic effect on the relaxation process. Microviscosities calculated from time-resolved anisotropy studies infer that the interface is almost ∼22 times higher viscous than the central part of the cylinder. Overall, our results reveal the unique dynamical features of water inside the cylinder of reverse hexagonal and inverse micellar phases.
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Affiliation(s)
- Bibhisan Roy
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Sagar Satpathi
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Krishna Gavvala
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Raj Kumar Koninti
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
| | - Partha Hazra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) , Pune, 411008, Maharashtra, India
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