Orientational ordering of crystal domains in ionic liquid based mixtures |
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Authors: | Imai Yusuke Abe Hiroshi Goto Takefumi Yoshimura Yukihiro Kushiyama Shogo Matsumoto Hitoshi |
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Institution: | Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239-8686, Japan. |
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Abstract: | By in situ observations using simultaneous X-ray diffraction and the DSC (differential scanning calorimetry) method, the effect of water, methanol, ethanol, and benzene on the crystallization has been observed in an ionic liquid (IL)-rich phase. The IL is a hydrophilic ionic liquid, N, N-diethyl-N-methyl-N-2-methoxyethyl ammonium tetrafluoroborate, DEME]BF4]. At a small amount of the above additional molecules in the IL, the conventional preferred orientation on the Debye rings was seen by the X-ray diffraction. At 0.9 mol % H2O, twinlike crystal domains develop extraordinary on the microdomains. By the "crystal-growth enhancement effect" at a slight amount of water, a composite domain structure, which consists of the large domain and the weakly orientated microdomains, is formed without internal strains. Above 2.9 mol % H2O, the domain structure, however, disappears completely. It is remarkable that, in a thermal cycling experiment using pure DEME]BF4], the similar composite domain structure appeared. This is also caused by an uptake of a slight amount of water. |
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