Browsing by Author "Kanaya, T"

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    Chemical deuteration of ionic liquids and their application in neutron reflectivity
    (International Conference on Neutron Scattering, 2017-07-12) Akutsu, K; Darwish, TA; Cagnes, MP; Tamura, K; Kanaya, T
    Low melting imidazolium salts are one of the most popular and widely used ionic liquids (ILs). Due to their low vapor pressures and thermal stability, ILs have been widely studied and employed in many applications such as synthesis and catalysis solvents, extraction solvents, electrolyte, and biopolymer solvents. However, in many case, structural analysis of IL samples is difficult because the X-ray and neutron scattering contrast between the ILs and the organic solute is not enough to allow different elements to be clearly discerned. Partial or complete deuteration of organic compounds for contrast variation in the scattering length densities of materials is one of the most effective techniques in the application of neutron scattering analysis. Therefore, this technique is ideally suited for the structural analysis of IL samples using neutron scattering techniques. In this study, we synthesized several kinds of deuterated 1-alkyl-3-methylimidazolium ionic liquids (alkyl = ethyl, butyl, and octyl) for studying the electric double layer structure in ILs using neutron reflectivity technique. For this purpose, we have developed a simple and effective method for the deuteration of imidazolium salts ILs on gram scale, starting from their protonated versions. In this presentation, we will show the summary of deuteration experiments and the results of neutron reflectivity analysis of the electric double layer structure in ILs.
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    The performance of magnetic lens for focusing VCN-SANS
    (Elsevier, 2011-04-01) Yamada, M; Iwashita, Y; Kanaya, T; Ichikawa, M; Tongu, H; Kennedy, SJ; Shimizu, HM; Mishima, K; Yamada, NL; Hirota, K; Carpenter, JM; Lal, J; Andersen, KH; Geltenbort, P; Guerard, B; Manzin, G; Hino, M; Kitaguchi, M; Bleuel, M
    We have developed a prototype rotating-permanent magnet sextupole lens (named rot-PMSx) for more efficient experiments with neutron beams in time of flight (ToF) mode. This lens can modulate the focusing strength over range 1.5 x 10(4)T/m(2) <= g' <= 5.9 x 10(4) T/m(2). Synchronization between the modulation and the beam pulse produces a focused beam without significant chromatic aberration. We anticipate that this lens could be utilized in focusing small angle neutron scattering (SANS) instruments for novel approach to high resolution SANS. We carried out experiments testing the principle of this lens at the very cold neutron (VCN) beamline (PF2) at Institut Laue-Langevin (ILL), France. The focused beam image size at the detector was kept constant at the same beam size as the source (approximate to 3 mm) over a wavelength range of 30 angstrom <= lambda <= 48 angstrom in focal length of approximate to 1.14m. The flux gain was about 12 relative to a beam without focusing, and the depth of focus was quite large. These results show the good performance of this lens and the system. Thereupon we have demonstrated the performance of this test bed for high resolution focusing of VCN-SANS for a well-studied softmatter sample; a deuterium oxide solution of Pluronic F127, an (PEO)(100)(PPO)(65)(PEO)(100) tri-block copolymer in deuterium oxide. The results of the focusing experiment and the focusing VCN-SANS are presented. (C) 2010 Elsevier B.V. All rights reserved.