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Kubisiak P, Wróbel P, Eilmes A. How Temperature, Pressure, and Salt Concentration Affect Correlations in LiTFSI/EMIM-TFSI Electrolytes: A Molecular Dynamics Study. J Phys Chem B 2021; 125:12292-12302. [PMID: 34706539 PMCID: PMC8591607 DOI: 10.1021/acs.jpcb.1c07782] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 10/13/2021] [Indexed: 11/29/2022]
Abstract
Classical polarizable molecular dynamics simulations have been performed for LiTFSI solutions in the EMIM-TFSI ionic liquid. Different temperature or pressure values and salt concentrations have been examined. The structure and dynamics of the solvation shell of Li+ cations, diffusion coefficients of ions, conductivities of the electrolytes, and correlations between motions of ions have been analyzed. The results indicated that regardless of the conditions, significant correlations are present in all systems. The degree of correlations depends mainly on the salt fraction in the electrolyte and is much less affected by temperature and pressure changes. A positive correlation between motions of Li+ cations and TFSI anions, leading to the occurrence of negative Li+ transference numbers, exists for all conditions, although temperature and pressure changes affect the speed of anion exchange in Li+ solvation shells.
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Affiliation(s)
- Piotr Kubisiak
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Piotr Wróbel
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Andrzej Eilmes
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
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2
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Greenwood G, Kim JM, Zheng Q, Nahid SM, Nam S, Espinosa-Marzal RM. Effects of Layering and Supporting Substrate on Liquid Slip at the Single-Layer Graphene Interface. ACS NANO 2021; 15:10095-10106. [PMID: 34114798 DOI: 10.1021/acsnano.1c01884] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Understanding modulation of liquid molecule slippage along graphene surfaces is crucial for many promising applications of two-dimensional materials, such as in sensors, nanofluidic devices, and biological systems. Here, we use force measurements by atomic force microscopy (AFM) to directly measure hydrodynamic, solvation, and frictional forces along the graphene plane in seven liquids. The results show that the greater slip lengths correlate with the interfacial ordering of the liquid molecules, which suggests that the ordering of the liquid forming multiple layers promotes slip. This phenomenon appears to be more relevant than solely the wetting behavior of graphene or the solid-liquid interaction energy, as traditionally assumed. Furthermore, the slip boundary condition of the liquids along the graphene plane is sensitive to the substrate underneath graphene, indicating that the underlying substrate affects graphene's interaction with the liquid molecules. Because interfacial slip can have prominent consequences on the pressure drop, on electrical and diffusive transport through nanochannels, and on lubrication, this work can inspire innovation in many applications through the modulation of the substrate underneath graphene and of the interfacial ordering of the liquid.
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Affiliation(s)
- Gus Greenwood
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Jin Myung Kim
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
| | - Qianlu Zheng
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Shahriar Muhammad Nahid
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
| | - SungWoo Nam
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, Illinois 61801, United States
| | - Rosa M Espinosa-Marzal
- Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 North Matthews Avenue, Urbana, Illinois 61801, United States
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 West Green Street, Urbana, Illinois 61801, United States
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3
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Lima TA, Paschoal VH, Freitas RS, Faria LFO, Li Z, Tyagi M, Z Y, Ribeiro MCC. An inelastic neutron scattering, Raman, far-infrared, and molecular dynamics study of the intermolecular dynamics of two ionic liquids. Phys Chem Chem Phys 2020; 22:9074-9085. [PMID: 32297886 DOI: 10.1039/d0cp00374c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The intermolecular dynamics in the THz frequency range of the ionic liquids n-butyl-trimethylammonium bis(trifluoromethanesulfonyl)imide, [N1114][NTf2], and methyl-tributylammonium bis(trifluoromethanesulfonyl)imide, [N1444][NTf2], were investigated by a combined usage of inelastic neutron scattering (INS), Raman, and far-infrared (FIR) spectroscopies and the power spectrum calculated by molecular dynamics (MD) simulations. The collective dynamics of the simulated systems is also discussed by the calculation of time correlation functions of charge and mass currents that are projected onto acoustic- and optic-like motions. The INS and Raman measurements have been performed as a function of temperature in the glassy, crystalline, and liquid phases. The excess in the vibrational density of states over the expectation of the Debye theory, the so-called boson peak, is found in the INS and Raman spectra as a peak at ∼2 meV (∼16 cm-1) and also in the direct measurement of heat capacity at very low temperatures (4-20 K). This low-frequency vibration is incorporated into the curve fits of Raman, FIR, and MD data at room temperature. Fits of spectra from these different sources in the range below 100 cm-1 are consistently achieved with three components at ca. 25, 50, and 80 cm-1, but with distinct relative intensities among the different techniques. It is proposed as the collective nature of the lowest-frequency component and the anion-cation intermolecular vibration nature of the highest-frequency component. The MD results indicate that there is no clear distinction between acoustic and optic vibrations in the spectral range investigated in this work for the ionic liquids [N1114][NTf2] and [N1444][NTf2]. The analysis carried out here agrees in part, but not entirely, with other propositions in the literature, mainly from optical Kerr effect (OKE) and FIR spectroscopies, concerning the intermolecular dynamics of ionic liquids.
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Affiliation(s)
- Thamires A Lima
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
| | - Vitor H Paschoal
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
| | - Rafael S Freitas
- Instituto de Física, Universidade de São Paulo, 05314-970 São Paulo, São Paulo, Brazil
| | - Luiz F O Faria
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
| | - Zhixia Li
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, USA and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
| | - Y Z
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Department of Nuclear, Plasma, and Radiological Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA and Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
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Paschoal VH, Ribeiro MCC. Pseudo-Optical Modes in Room-Temperature Ionic Liquids. J Phys Chem B 2020; 124:2661-2667. [DOI: 10.1021/acs.jpcb.0c00890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vitor H. Paschoal
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-000, São Paulo, SP, Brazil
| | - Mauro C. C. Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, 05508-000, São Paulo, SP, Brazil
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Synthesis, thermal stability, vibrational spectra and conformational studies of novel dicationic meta-xylyl linked bis-1-methylimidazolium ionic liquids. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.03.019] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Lima TA, Ribeiro MCC. Low-frequency Raman spectra of a glass-forming ionic liquid at low temperature and high pressure. J Chem Phys 2019; 150:164502. [PMID: 31042905 DOI: 10.1063/1.5094724] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The frequency range below ∼100 cm-1 of the Raman spectrum of a glass-forming liquid exhibits two features that characterize the short-time (THz) dynamics: the quasi-elastic scattering (QES) tail and the boson peak (BP). In this work, we follow temperature and pressure effects on the intermolecular dynamics of a typical ionic liquid, 1-butyl-1-methylpiperidinium bis(trifluoromethanesulfonyl)imide, [Pip14][[NTf2]. The glass transition temperature of [Pip14][[NTf2] at atmospheric pressure is Tg = 198 K, and the pressure of glass transition at room temperature is Pg = 1.1 GPa. Raman spectra obtained while cooling the liquid or heating the glass exhibit hysteresis in QES and BP intensities, IQES and IBP. The dependence of IQES, IBP, and the BP frequency, ωBP, with pressure up to the glass transition is steeper than the temperature dependence due to the stronger pressure effect on density within the GPa range. The temperature and pressure behaviors of the parameters IQES, IBP, and ωBP obtained here for [Pip14][[NTf2] are discussed in light of known results for other glass-formers.
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Affiliation(s)
- Thamires A Lima
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
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Abe H, Tokita T, Iwata K, Ozawa S. Lithium-triggered spontaneous formation of polyiodides in room-temperature ionic liquid-alcohol solutions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 212:255-261. [PMID: 30654323 DOI: 10.1016/j.saa.2018.12.049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 12/10/2018] [Accepted: 12/27/2018] [Indexed: 06/09/2023]
Abstract
In this study, the effect of alcohol on polyiodide formation in room-temperature ionic liquid (RTIL) was examined by time evolutions of Raman spectra in the low-frequency region and by color changes of the sample. The RTIL was 1-methyl-3-propylimidazolium iodide, [C3mim][I]. Polyiodides develop in [C3mim][I]‑lithium salt-ethanol solutions (Abe et al., Chem. Phys. 502 (2018) 72.). Without the external addition of iodine or without an external electric field, the irreversible transformation from I- to I3- indicates that charge unbalancing was promoted by lithium ion. Polyiodide formations were not induced by sodium or potassium ions. Strong alcohol effects were observed directly by the time-dependent Raman bands in the low-frequency region.
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Affiliation(s)
- Hiroshi Abe
- Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan.
| | - Tsukasa Tokita
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
| | - Koichi Iwata
- Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo 171-8588, Japan
| | - Shinichiro Ozawa
- Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan
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8
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Abstract
Molecular dynamics (MD) simulations of five ionic liquids based on 1-alkyl-3-methylimidazolium cations, [C n C1im]+, have been performed in order to calculate high-frequency elastic moduli and to evaluate heterogeneity of local elastic moduli. The MD simulations of [C n C1im][NO3], n = 2, 4, 6, and 8, assessed the effect of domain segregation when the alkyl chain length increases, and [C8C1im][PF6] assessed the effect of strength of anion-cation interaction. Dispersion curves of excitation energies of longitudinal and transverse acoustic, LA and TA, modes were obtained from time correlation functions of mass currents at different wavevectors. High-frequency sound velocity of LA modes depends on the alkyl chain length, but sound velocity for TA modes does not. High-frequency bulk and shear moduli, K ∞ and G ∞ , depend on the alkyl chain length because of a density effect. Both K ∞ and G ∞ are strongly dependent on the anion. The calculation of local bulk and shear moduli was accomplished by performing bulk and shear deformations of the systems cooled to 0 K. The simulations showed a clear connection between structural and elastic modulus heterogeneities. The development of nano-heterogeneous structure with increasing length of the alkyl chain in [C n C1im][NO3] implies lower values for local bulk and shear moduli in the non-polar domains. The mean value and the standard deviations of distributions of local elastic moduli decrease when [NO3]- is replaced by the less coordinating [PF6]- anion.
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Affiliation(s)
- Arno A Veldhorst
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
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9
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Faria LFO, Lima TA, Ferreira FF, Ribeiro MCC. Ultraslow Phase Transitions in an Anion–Anion Hydrogen-Bonded Ionic Liquid. J Phys Chem B 2018; 122:1972-1980. [DOI: 10.1021/acs.jpcb.7b09497] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luiz F. O. Faria
- Laboratório
de Espectroscopia Molecular, Departamento de Química Fundamental,
Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Thamires A. Lima
- Laboratório
de Espectroscopia Molecular, Departamento de Química Fundamental,
Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Fabio F. Ferreira
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, SP, Brazil
| | - Mauro C. C. Ribeiro
- Laboratório
de Espectroscopia Molecular, Departamento de Química Fundamental,
Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
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10
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Kadari M, Belarbi EH, Moumene T, Bresson S, Haddad B, Abbas O, Khelifa B. Comparative study between 1-Propyl-3-methylimidazolium bromide and trimethylene bis-methylimidazolium bromide ionic liquids by FTIR/ATR and FT-RAMAN spectroscopies. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.076] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Drai M, Mostefai A, Paolone A, Haddad B, Belarbi E, Villemin D, Bresson S, Abbas O, Chaker Y, Rahmouni M. Synthesis, experimental and theoretical vibrational studies of 1-methyl and 1,2-dimethyl, 3-propyl imidazolium bis(trifluoromethanesulfonyl) imide. J CHEM SCI 2017. [DOI: 10.1007/s12039-017-1282-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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12
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Abstract
Vibrational spectroscopy has continued use as a powerful tool to characterize ionic liquids since the literature on room temperature molten salts experienced the rapid increase in number of publications in the 1990's. In the past years, infrared (IR) and Raman spectroscopies have provided insights on ionic interactions and the resulting liquid structure in ionic liquids. A large body of information is now available concerning vibrational spectra of ionic liquids made of many different combinations of anions and cations, but reviews on this literature are scarce. This review is an attempt at filling this gap. Some basic care needed while recording IR or Raman spectra of ionic liquids is explained. We have reviewed the conceptual basis of theoretical frameworks which have been used to interpret vibrational spectra of ionic liquids, helping the reader to distinguish the scope of application of different methods of calculation. Vibrational frequencies observed in IR and Raman spectra of ionic liquids based on different anions and cations are discussed and eventual disagreements between different sources are critically reviewed. The aim is that the reader can use this information while assigning vibrational spectra of an ionic liquid containing another particular combination of anions and cations. Different applications of IR and Raman spectroscopies are given for both pure ionic liquids and solutions. Further issues addressed in this review are the intermolecular vibrations that are more directly probed by the low-frequency range of IR and Raman spectra and the applications of vibrational spectroscopy in studying phase transitions of ionic liquids.
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Affiliation(s)
- Vitor H Paschoal
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Luiz F O Faria
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
| | - Mauro C C Ribeiro
- Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo , Av. Prof. Lineu Prestes 748, São Paulo 05508-000, Brazil
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Pilar K, Rua A, Suarez SN, Mallia C, Lai S, Jayakody JRP, Hatcher JL, Wishart JF, Greenbaum S. Investigation of dynamics in BMIM TFSA ionic liquid through variable temperature and pressure NMR relaxometry and diffusometry. JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2017; 164:H5189-H5196. [PMID: 30034028 PMCID: PMC6052354 DOI: 10.1149/2.0301708jes] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A comprehensive variable temperature, pressure and frequency multinuclear (1H, 2H, and 19F) magnetic resonance study was undertaken on selectively deuterated 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (BMIM TFSA) ionic liquid isotopologues. This study builds on our earlier investigation of the effects of increasing alkyl chain length on diffusion and dynamics in imidazolium-based TFSA ionic liquids. Fast field cycling 1H T1 data revealed multiple modes of motion. Through calculation of diffusion coefficient (D) values and activation energies, the low- and high-field regimes were assigned to the translational and reorientation dynamics respectively. Variable-pressure 2H T1 measurements reveal site-dependent interactions in the cation with strengths in the order MD3 > CD3 > CD2, indicating dissimilarities in the electric field gradients along the alkyl chain, with the CD2 sites having the largest gradient. Additionally, the α saturation effect in T1 vs. P was observed for all three sites, suggesting significant reduction of the short-range rapid reorientational dynamics. This reduction was also deduced from the variable pressure 1H T1 data, which showed an approach to saturation for both the methyl and butyl group terminal methyl sites. Pressure-dependent D measurements show independent motions for both cations and anions, with the cations having greater D values over the entire pressure range.
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Affiliation(s)
- Kartik Pilar
- Department of Physics, Hunter College, New York, NY 10065, United States
- CUNY Graduate School, New York, New York 10016, United States
| | - Armando Rua
- Department of Physics, Hunter College, New York, NY 10065, United States
- Department of Physics, Recinto Universitario de Mayagüez, Mayagüez, PR 00681
- CUNY Graduate School, New York, New York 10016, United States
| | - Sophia N Suarez
- Physics Department, Brooklyn College, Brooklyn, NY 11210, United States
- CUNY Graduate School, New York, New York 10016, United States
| | - Christopher Mallia
- Department of Physics, Hunter College, New York, NY 10065, United States
| | - Shen Lai
- Department of Physics, Hunter College, New York, NY 10065, United States
- CUNY Graduate School, New York, New York 10016, United States
| | - J R P Jayakody
- Department of Physics, University of Kelaniya, Kelaniya, Sri Lanka 11600
| | - Jasmine L Hatcher
- Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, United States
- CUNY Graduate School, New York, New York 10016, United States
| | - James F Wishart
- Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, United States
| | - Steve Greenbaum
- Department of Physics, Hunter College, New York, NY 10065, United States
- CUNY Graduate School, New York, New York 10016, United States
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El Hadri M, Achahbar A, El Khamkhami J, Khelifa B, Faivre V, Abbas O, Bresson S. Lyotropic behavior of Gelucire 50/13 by XRD, Raman and IR spectroscopies according to hydration. Chem Phys Lipids 2016; 200:11-23. [PMID: 27318039 DOI: 10.1016/j.chemphyslip.2016.05.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 05/05/2016] [Accepted: 05/10/2016] [Indexed: 10/21/2022]
Abstract
The present paper discuss the structural and vibrational properties of polyoxyethylene glycol glycerides (Gelucire 50/13) during the hydration with increasing water from 0% to 80%. The Gelucire 50/13 used as sustained release matrix forming agent in pharmaceutical applications and it was essentially studied by Small and Wide Angle X-ray Scattering (SWAXS), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy according to the rate of hydration. The hydration behavior of this amphiphilic excipient has been investigated in the spectral range 4000-0cm-1 in Raman spectroscopy, and 4000-600cm-1 in FTIR. At increasing water contents Gelucire 50/13 forms successive bicontinuous to micellar supramolecular structures, and the vibrational changes were directly correlated with this conformational changes of the Gelucire structure. Overall, Raman and IR spectroscopy clearly demonstrated that the different functional groups studied could be characterized independently, allowing for the understanding of their role in Gelucire polymorphism.
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Affiliation(s)
- M El Hadri
- Laboratoire de Physique de la Matière Condensée, Université Abdelmalek Essaâdi, Tétouan, Morocco
| | - A Achahbar
- Laboratoire de Physique de la Matière Condensée, Université Abdelmalek Essaâdi, Tétouan, Morocco
| | - J El Khamkhami
- Laboratoire de Physique de la Matière Condensée, Université Abdelmalek Essaâdi, Tétouan, Morocco
| | - B Khelifa
- Faculté des sciences, Université d'Artois, Lens, France; Laboratoire de Physique des Systèmes Complexes, Université Picardie Jules Verne, 33 rue St. Leu, 80039 Amiens cedex, France
| | - V Faivre
- Equipe Physico-chimie des Systèmes Polyphasés, UMR CNRS 8612, Labex LERMIT Université Paris Sud, France
| | - O Abbas
- Walloon Agricultural Research Centre (CRA-W), Valorisation of Agricultural Products, Department, Food and Feed Quality Unit (U15), 'Henseval Building', Chaussée de Namur 24, 5030 Gembloux, Belgium
| | - S Bresson
- Laboratoire de Physique des Systèmes Complexes, Université Picardie Jules Verne, 33 rue St. Leu, 80039 Amiens cedex, France.
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15
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Suarez SN, Rúa A, Cuffari D, Pilar K, Hatcher JL, Ramati S, Wishart JF. Do TFSA Anions Slither? Pressure Exposes the Role of TFSA Conformational Exchange in Self-Diffusion. J Phys Chem B 2015; 119:14756-65. [PMID: 26509865 DOI: 10.1021/acs.jpcb.5b08658] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Multinuclear ((1)H, (2)H, and (19)F) magnetic resonance spectroscopy techniques as functions of temperature and pressure were applied to the study of selectively deuterated 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (EMIM TFSA) ionic liquid isotopologues and related ionic liquids. For EMIM TFSA, temperature-dependent (2)H T1 data indicate stronger electric field gradients in the alkyl chain region compared to the imidazolium ring. Most significantly, the pressure dependences of the EMIM and TFSA self-diffusion coefficients revealed that the displacements of the cations and anions are independent, with diffusion of the TFSA anions being slowed much more by increasing pressure than for the EMIM cations, as shown by their respective activation volumes (28.8 ± 2.5 cm(3)/mol for TFSA vs 14.6 ± 1.3 cm(3)/mol for EMIM). Increasing pressure may lower the mobility of the TFSA anion by hindering its interconversion between trans and cis conformers, a process that is coupled to diffusion according to published molecular dynamics simulations. Measured activation volumes (ΔV(‡)) for ion self-diffusion in EMIM bis(fluoromethylsulfonyl)amide and EMIM tetrafluoroborate support this hypothesis. In addition, (2)H T1 data suggest increased ordering with increasing pressure, with two T1 regimes observed for the MD3 and D2 isotopologues between 0.1-100 and 100-250 MPa, respectively. The activation volumes for T1 were 21 and 25 cm(3)/mol (0-100 MPa) and 11 and 12 cm(3)/mol (100-250 MPa) for the MD3 and D2 isotopologues, respectively.
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Affiliation(s)
- Sophia N Suarez
- Physics Department, Brooklyn College , Brooklyn, New York 11210, United States
| | - Armando Rúa
- Department of Physics, Hunter College , New York, New York 10021, United States.,CUNY Graduate School, New York, New York 10016, United States
| | - David Cuffari
- Physics Department, Brooklyn College , Brooklyn, New York 11210, United States.,CUNY Graduate School, New York, New York 10016, United States
| | - Kartik Pilar
- Department of Physics, Hunter College , New York, New York 10021, United States.,CUNY Graduate School, New York, New York 10016, United States
| | - Jasmine L Hatcher
- CUNY Graduate School, New York, New York 10016, United States.,Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Sharon Ramati
- Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - James F Wishart
- Chemistry Department, Brookhaven National Laboratory , Upton, New York 11973, United States
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16
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Faria LFO, Ribeiro MCC. Phase Transitions of Triflate-Based Ionic Liquids under High Pressure. J Phys Chem B 2015; 119:14315-22. [DOI: 10.1021/acs.jpcb.5b08242] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luiz F. O. Faria
- Laboratório de Espectroscopia
Molecular, Instituto de Química, Universidade de São Paulo, CP
26077, São Paulo, São Paulo 05513-970, Brazil
| | - Mauro C. C. Ribeiro
- Laboratório de Espectroscopia
Molecular, Instituto de Química, Universidade de São Paulo, CP
26077, São Paulo, São Paulo 05513-970, Brazil
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17
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Kofu M, Inamura Y, Moriya Y, Podlesnyak A, Ehlers G, Yamamuro O. Inelastic neutron scattering study on boson peaks of imidazolium-based ionic liquids. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.07.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Paschoal VH, Ribeiro MC. Molecular dynamics simulations of high-frequency sound modes in ionic liquids. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.04.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Moumene T, Belarbi EH, Haddad B, Villemin D, Abbas O, Khelifa B, Bresson S. Study of imidazolium dicationic ionic liquids by Raman and FTIR spectroscopies: The effect of the nature of the anion. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.11.061] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Ozawa S, Kishimura H, Kitahira S, Tamatani K, Hirayama K, Abe H, Yoshimura Y. Isomer effect of propanol on liquid–liquid equilibrium in hydrophobic room-temperature ionic liquids. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.09.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Moumene T, Belarbi EH, Haddad B, Villemin D, Abbas O, Khelifa B, Bresson S. Vibrational spectroscopic study of ionic liquids: Comparison between monocationic and dicationic imidazolium ionic liquids. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.02.034] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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23
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Faria LFO, Penna TC, Ribeiro MCC. Raman Spectroscopic Study of Temperature and Pressure Effects on the Ionic Liquid Propylammonium Nitrate. J Phys Chem B 2013; 117:10905-12. [DOI: 10.1021/jp4066778] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Luiz F. O. Faria
- Laboratório de Espectroscopia
Molecular, Instituto de Química, Universidade de São Paulo, CP
26077, CEP 05513-970, São
Paulo, SP, Brazil
| | - Tatiana C. Penna
- Laboratório de Espectroscopia
Molecular, Instituto de Química, Universidade de São Paulo, CP
26077, CEP 05513-970, São
Paulo, SP, Brazil
| | - Mauro C. C. Ribeiro
- Laboratório de Espectroscopia
Molecular, Instituto de Química, Universidade de São Paulo, CP
26077, CEP 05513-970, São
Paulo, SP, Brazil
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