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Solid-liquid phase equilibrium for the hexamethylenetetramine–NH4Cl–H2O system: Solubility determination, model correlation and molecular simulation. Chem Phys Lett 2023. [DOI: 10.1016/j.cplett.2023.140393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Abe H, Kishimura H, Uruichi M. A phase variety of fluorinated ionic liquids: Molecular conformational and crystal polymorph. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 286:121948. [PMID: 36252301 DOI: 10.1016/j.saa.2022.121948] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/26/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Crystal polymorphs of fluorinated ionic liquids (fILs) were examined at low-temperature (LT) by Raman spectroscopy. The fILs were 1-alkyl-3-methylimidazolium perfluorobutanesulfonate, [Cnmim][PFBS] (n = 4, 6, and 8). The cations and anion possess conformational degrees of freedom. Various LT phases were derived from the conformational polymorphs of the cations and the anion. Conformational flexibility depended on alkyl chain length. The crystal polymorphs in the fILs were sensitive to molecular conformations and flexibility.
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Affiliation(s)
- Hiroshi Abe
- Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan
| | - Hiroaki Kishimura
- Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan
| | - Mikio Uruichi
- Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
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Abe H, Yoshiichi Y, Kishimura H. Hydrogen/deuterium Exchange in 1-Alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide-based Solutions. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abe H, Nemoto F, Kishimura H, Ozawa S. CO2 capture by quenched quaternary ammonium ionic liquid-propanol mixtures assessed by Raman spectroscopy. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113687] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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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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Abe H, Tsuzuki S, Ozawa S. Anion effects on amorphization and crystallization in room-temperature ionic liquids. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.09.046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kishimura H, Kohki E, Nakada A, Tamatani K, Abe H. Ether bond effects in quaternary ammonium and phosphonium ionic liquid-propanol solutions. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.01.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abe H, Kishimura H, Aono M. Anomalous phase behavior of excess iodide in room-temperature ionic liquid: 1-methyl-3-propylimidazolium iodide. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.01.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Abe H, Aono M, Takekiyo T, Yoshimura Y, Shimizu A. Phase behavior of water-mediated protic ionic liquid: Ethylammonium nitrate. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.05.150] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Abe H, Kohki E, Nakada A, Kishimura H. Phase behavior in quaternary ammonium ionic liquid-propanol solutions: Hydrophobicity, molecular conformations, and isomer effects. Chem Phys 2017. [DOI: 10.1016/j.chemphys.2017.05.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Qiao Y, Ma W, Theyssen N, Chen C, Hou Z. Temperature-Responsive Ionic Liquids: Fundamental Behaviors and Catalytic Applications. Chem Rev 2017; 117:6881-6928. [DOI: 10.1021/acs.chemrev.6b00652] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yunxiang Qiao
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Wenbao Ma
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Nils Theyssen
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Chen Chen
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
| | - Zhenshan Hou
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China
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Abe H, Fukushima R, Onji M, Hirayama K, Kishimura H, Yoshimura Y, Ozawa S. Two-length scale description of hydrophobic room-temperature ionic liquid–alcohol systems. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2015.12.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abe H, Takeshita A, Sudo H, Akiyama K, Kishimura H. CO<sub>2</sub> Capture at Room Temperature and Ambient Pressure: Isomer Effect in Room Temperature Ionic Liquid/Propanol Solutions. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/gsc.2016.62011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abe H, Imai Y, Tokunaga N, Yamashita Y, Sasaki Y. Highly Efficient Electrohydrodynamic Pumping: Molecular Isomer Effect of Dielectric Liquids, and Surface States of Electrodes. ACS APPLIED MATERIALS & INTERFACES 2015; 7:24492-24500. [PMID: 26465161 DOI: 10.1021/acsami.5b05778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Highly efficient electrohydrodynamic (EHD) pumping was obtained by a combination of a dielectric liquid having a molecular isomer and electrodes with a smooth surface. Four kinds of surface states of Cu electrodes were processed by conventional mechanical polishing, fine diamond paste polishing, chemical etching and Au vapor deposition. A series of hydrofluoroether liquids (HFEs) were used as dielectric liquids: C3F7OCH3 (HFE-7000), C4F9OCH3 (HFE-7100), C4F9OC2H5 (HFE-7200), C6F13OCH3 (HFE-7300), and C5H5F6OC3HF6 (HFE-7600). The coexistence of normal (n-) and isomer (i-) HFEs and their molar fractions were examined by NMR spectroscopy. Among the dielectric liquids, the hybrid n- and i-HFE-7600 showed highly efficient EHD pumping, where the electric current, I, was sufficiently suppressed by the smooth surface of the electrodes. The maximum hydrostatic pressure Δpmax was ∼7500 Pa with 12 kV and I = 19 μA. The smooth surface of the electrodes contributes not only to the formation of a stable electric double layer (EDL) but also to the prevention of charge injection from the electrodes. Polarization pumping derived from the stable EDL enables highly efficient energy transfer without discharging, or damage to the sample and electrodes. The dipole moments of the HFEs were estimated by density functional theory calculations. The hydrostatic pressure was found to be proportional to the difference in the calculated dipole moment between n- and i-HFEs. Numerical simulations were carried out to examine the experimentally obtained electrode gap dependence of the hydrostatic pressure.
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Affiliation(s)
- Hiroshi Abe
- Department of Materials Science and Engineering, National Defense Academy , Yokosuka 239-8686, Japan
| | - Yusuke Imai
- Department of Materials Science and Engineering, National Defense Academy , Yokosuka 239-8686, Japan
| | - Naoki Tokunaga
- Department of Materials Science and Engineering, National Defense Academy , Yokosuka 239-8686, Japan
| | - Yasuhiro Yamashita
- Department of Materials Science and Engineering, National Defense Academy , Yokosuka 239-8686, Japan
| | - Yoshiki Sasaki
- Department of Materials Science and Engineering, National Defense Academy , Yokosuka 239-8686, Japan
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