Study of solvent water in the amorphized tetrahydrofuran-clathrate-hydrate from a view point of water polyamorphism

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400432
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biological physics/Chemical physics/Soft matter physics
• Research Institution: National Institute for Materials Science
• Principal Investigator: Suzuki Yoshiharu 国立研究開発法人物質・材料研究機構, 表界面構造・物性ユニット, 主幹研究員 (90236026)
• Co-Investigator(Renkei-kenkyūsha): MISHIMA Osamu 国立研究開発法人、物質・材料研究機構, 表界面構造・物性ユニット, フェロー (10133141)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 水 / ポリアモルフィズム / クラスレートハイドレート / テトラヒドロフラン / アモルファス氷 / ガラス転移 / 圧力誘起アモルファス化

Outline of Final Research Achievements

The pressure-induced amorphization of tetrahydrofuran-clathrate-hydrate, THF-CH, and the polyamorphic transition of the amorphized THF-CH were studied. The effect of the existence of THF molecules on the polyamorphic state of solvent water was discussed from a viewpoint of water polyamorphism. It is found that the THF molecules unstabilize the HDA-like structure of solvent water and stabilize the LDA-like structure. This result suggests that the water polyamorphism relates deeply to the formation of clathrate structure and the segregation of aqueous solution at low temperatures.

Free Research Field

ガラス・液体