Heat-induced phase separation of alkali chloride-HFIP-water mixtures

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• 作者：Toshiyuki Takamuku ; Yuki Kouda ; Takuya Shimomura
• 关键词：LCST ; Small-angle neutron scattering ; Infrared spectroscopy ; NMR ; Preferential solvation ; Hydrogen bonds
• 刊名：Journal of Molecular Liquids
• 出版年：January, 2014
• 年：2014
• 卷：189
• 期：Complete
• 页码：113-121
• 全文大小：1583 K

文摘

We have found that phase separation of alkali chloride-1,1,1,3,3,3-hexafluoro-2-propanol (HFIP)-water ternary mixtures takes place by heating, although HFIP-water binary mixtures cannot be separated as the temperature rises up to the boiling point of HFIP. Phase separation of the ternary mixtures is induced on addition of alkali chloride (MCl) at lower temperature in the order of NaCl < LiCl < KCl. The change in the heterogeneity of MCl-HFIP-d₁-D₂O mixtures with rising temperature was observed using small-angle neutron scattering (SANS) technique. The temperature dependence of the hydrogen bonds of water-water and HFIP-water in MCl-HFIP-H₂O mixtures was evaluated by means of infrared and NMR. According to the present results, the mechanism of heat-induced phase separation of MCl-HFIP-water mixtures has been discussed at the molecular level.