2011 Fiscal Year Final Research Report
Liquid-liquid phase transition and dynamic properties of low-temperature water under pressure, and chemical-pressurization effects on water
| Project/Area Number |
21340118
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OGUNI Masaharu 東京工業大学, 大学院・理工学研究科, 教授 (50144423)
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| Co-Investigator(Renkei-kenkyūsha) |
TOZAKI Kenichi 千葉大学, 教育学部, 教授 (30102031)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 水 / ガラス転移 / 相転移 / 熱容量 / 構造緩和 |
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| Research Abstract |
Heat capacities of the dilute aqueous solutions, with different second components, confined within silica nanopores were measured by calorimetry. The heat capacity maximum, which appeared around 233 K in pure water, developed to a clear peak with doping hydroxylamine(HA) while it disappeared with doping methanol and so on. The peak revealed characters of first-order transitions, and the transition temperature increased with increase in the HA composition x and decreased with pressurization. Simultaneously the transition peak area in the thermal analysis of a 5 wt% HA solution decreased with pressurization. Based on these results, we proposed a new model of p-T-x phase diagram in which HA doping provides an effect of negative pressurization on water and a liquid-liquid phase transition line and a critical point as the line terminal exist in a negative pressure range.
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