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231 results on '"Kanzaki, Ryo"'

31. Lithium ion salvation in room-temperature ionic liquids involving bis(trifluoromethanesulfonyl) imide anion studied by Raman spectroscopy and DFT calculations

Author

Umebayashi, Yasuhiro, Takushi Mitsugi, Shuhei Fukuda, Fujimori, Takao, Fujii, Kenta, Kanzaki, Ryo, Takeuchi, Munetaka, and Shin-Ichi Ishiguro

Subjects
Raman spectroscopy -- Usage, Coordination compounds -- Research, Coordination compounds -- Chemical properties, Lithium compounds -- Research, Lithium compounds -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

The salvation structure of the lithium ion in room-temperature ionic liquids 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide and N-butyl-N-methylpyrrolidinium bis(trifluoromethane-sulfonyl) imide is studied using Raman spectroscopy and DFT calculations. It is seen that the [C.sub.1] (cis) conformer is preferred in the vicinity of the lithium ion.

Published
2007

35. Conformational equilibrium of Bis(trifluoromethanesulfonyl) imide anion of a room-temperature ionic liquid: Raman spectroscopic study and DFT calculations

Author

Fujii, Kenta, Fujimori, Takao, Takamuku, Toshiyuki, Kanzaki, Ryo, Umebayashi, Yasuhiro, and Ishiguro, Shin-ichi

Subjects
Methane -- Chemical properties, Density functionals -- Usage, Fluorine compounds -- Chemical properties, Sulfur compounds -- Chemical properties, Raman spectroscopy -- Usage, Chemicals, plastics and rubber industries
Abstract

The structure of bis(trifluoromethanesulfonyl) imide(TFSI(super minus)) in the liquid state was studied by means of Raman spectroscopy and DFL Calculations. The results concluded that a conformational equilibrium was established between the C(sub 1) and C(sub 2) conformers of TFSI(super minus) in the liquid EMI(super plus)TFSI(super -) and the C2 conformer is more favorable than the C1 one.

Published
2006

37. Evidence of conformational equilibrium of 1-ethyl-3-methylimidazolium in its ionic liquid salts: Raman spectroscopic study and quantum chemical calculations

Author

Umebayashi, Yasuhiro, Fujimori, Takao, Sukizaki, Tetsuya, Asada, Mitsunori, Fujii, Kenta, Kanzaki, Ryo, and Ishiguro, Shin-ichi

Subjects
Imidazole -- Chemical properties, Imidazole -- Spectra, Raman spectroscopy -- Usage, Methyl groups -- Chemical properties, Methyl groups -- Spectra, Chemicals, plastics and rubber industries
Abstract

Spectroscopic evidence for the presence of two conformers of 1-ethyl-3-methylimidazolium in the liquid state by Raman spectroscopy and quantum chemical calculations is presented. Results reveal that the 1-ethyl-3-methylimidazolium ion exists as either a nonplanar or planar conformer in equilibrium in its liquid salts.

Published
2005

41. Dispersion mechanism of polyacrylic acid-coated nanoparticle in protic ionic liquid, N,N-diethylethanolammonium trifluoromethanesulfonate

Author

Fresnais, Jérôme, Kanzaki, Ryo, Guibert, Clément, Peyre, Véronique, PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Department of Chemistry, Kyushu University [Fukuoka], Matière et Systèmes Complexes (MSC (UMR_7057)), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques (PECSA), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-ESPCI ParisTech-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), and Université Pierre et Marie Curie - Paris 6 (UPMC)-ESPCI ParisTech-Centre National de la Recherche Scientifique (CNRS)

Subjects
Inorganic chemistry, Polyacrylic acid, Solvation, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Biomaterials, chemistry.chemical_compound, Colloid, Colloid and Surface Chemistry, chemistry, Ionic strength, Ionic liquid, [CHIM]Chemical Sciences, Ethylammonium nitrate, 0210 nano-technology, Dispersion (chemistry), Trifluoromethanesulfonate, [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft]
Abstract

International audience; Hypothesis: Ionic liquids (ILs) are extremely concentrated electrolyte solutions. The ubiquitous presence of ions induces specific behaviors for chemical reactions compared to reactions in water solutions. This is also the case for the stability of colloidal dispersions, for which the DLVO model cannot be applied as the ionic strength is out of the model range. In a previous work, in the protic IL ethylammonium nitrate (doi: https://doi.org//10.1016/j.jcis.2015.04.059), we observed an unexpected influence of the pH on the stabil- ity of dispersion of maghemite nanoparticles coated with poly(acrylic acid) (pAA).Experiments: To clarify and generalize these observations, we investigated here the pH response of the dispersion in a second protic ionic liquid with a different acid-base nature, diethylethanolammonium tri- fluoromethanesulfonate. pH titrations of the dispersions were achieved with an IS-FET electrode and the associated thermodynamic constants determined. The colloid structural properties were examined by small angle X-ray scattering.Findings: Under acidic or mildly basic condition, a stable dispersion was obtained, i.e., when the degree of dissociation of pAA, a, was a < 0.1 or a > 0.7. Dispersions form quite dense but reversible aggregates in the intermediate a range. A model for the solvation layer around the particles is proposed and generalizes the former findings.

Published
2018

48. Experimental evidences for molecular origin of low-Q peak in neutron/x-ray scattering of 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ionic liquids.

Author

Fujii, Kenta, Kanzaki, Ryo, Takamuku, Toshiyuki, Kameda, Yasuo, Kohara, Shinji, Kanakubo, Mitsuhiro, Shibayama, Mitsuhiro, Ishiguro, Shin-ichi, and Umebayashi, Yasuhiro

Subjects
*MOLECULAR dynamics, *SCATTERING (Physics), *IMIDAZOLES, *AMIDES, *IONIC liquids, *CLUSTERING of particles, *MICELLES, *SOLUTION (Chemistry)
Abstract

Short- and long-range liquid structures of [CnmIm+][TFSA-] with n = 2, 4, 6, 8, 10, and 12 have been studied by high-energy x-ray diffraction (HEXRD) and small-angle neutron scattering (SANS) experiments with the aid of MD simulations. Observed x-ray structure factor, S(Q), for the ionic liquids with the alkyl-chain length n > 6 exhibited a characteristic peak in the low-Q range of 0.2-0.4 Å -1, indicating the heterogeneity of their ionic liquids. SANS profiles IH(Q) and ID(Q) for the normal and the alkyl group deuterated ionic liquids, respectively, showed significant peaks for n = 10 and 12 without no form factor component for large spherical or spheroidal aggregates like micelles in solution. The peaks for n = 10 and 12 evidently disappeared in the difference SANS profiles ΔI(Q) [=ID(Q) - IH(Q)], although that for n = 12 slightly remained. This suggests that the long-range correlations originated from the alkyl groups hardly contribute to the low-Q peak intensity in SANS. To reveal molecular origin of the low-Q peak, we introduce here a new function; x-ray structure factor intensity at a given Q as a function of r, SQpeak(r). The SQpeak(r) function suggests that the observed low-Q peak intensity depending on n is originated from liquid structures at two r-region of 5-8 and 8-15 Å for all ionic liquids examined except for n = 12. Atomistic MD simulations are consistent with the HEXRD and SANS experiments, and then we discussed the relationship between both variations of low-Q peak and real-space structure with lengthening the alkyl group of the CnmIm. [ABSTRACT FROM AUTHOR]

Published
2011
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50. Raman spectroscopic study, DFT calculations and MD simulations on the conformational isomerism of N-alkyl-N-methylpyrrolidinium bis-(trifluoromethanesulfonyl) amide ionic liquids

Author

Umebayashi, Yasuhiro, Mitsugi, Takushi, Fujii, Kenta, Seki, Shiro, Chiba, Kazumi, Yamamoto, Hideo, Lopes, Jose N. Canongia, Padua, Agilio A. H., Takeuchi, Munetaka, Kanzaki, Ryo, and Ishiguro, Shin-ichi

Subjects
Raman spectroscopy -- Usage, Ionic liquids -- Properties, Ionic liquids -- Research, Potential energy -- Research, Chemicals, plastics and rubber industries
Published
2009

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