Properties of high-pressure solvents for fullerenes

富勒烯高压溶剂的特性

• 批准号: 14540550
• 负责人: SAWAMURA Seiji
• 金额: $ 1.09万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540550/
• 关键词: Fullerene; High pressure; Solubilitv; Pressure dependence; フラーレン; 相転移; 相平衡; 溶媒和結晶

Solubility phenomena of C60 in toluene was observed under high pressure. Before doing it, some improvements for high-pressure equipment have been done to keep the high pressure in the vessel for several months because the equilibration for the solubility takes a long time of several days or weeks. One of the improvements was done by selecting a heat-treated copper as a material for the gasket and by cutting it with an accuracy of 0.01 mm to fit it to the cylinder of the high-pressure cylinder.Two solubility (x in mole-fraction unit) -pressure (p)-temperature (T) surfaces were observed for C60 in toluene suggesting an phase transition in solid phase. These surfaces were drawn in the following equations, respectively.lnx+5.087-8.426x10^3(p/MPa)-15.385x10^<-6>(p/MPa)(high pressure and low temperature)lnx-10.9612+943.881(T/K)+[261(T/K)-0.0724](p/MPa)(low pressure and high temperature)Using hexane. as a solvent in the next step, high-pressure solubility of C60 was also measured. It showed a breaking of the surface suggesting a phase transition at a high pressure as well as C60 in toluene. The solubility increased after the phase transition though that in toluene decreased. Such difference in the high-pressure solubility suggests that the structure of solvated solids which coexist with saturated solutions differs from each other.

在高压下观察了C60在甲苯中的溶解现象。在此之前，已经对高压设备进行了一些改进，使高压在容器中保持数月，因为溶解度的平衡需要几天或几周的长时间。其中一项改进是选择一种热处理过的铜作为衬垫的材料，并以0.01毫米的精度切割它，使其适合高压气缸的气缸。在甲苯中观察到C60的两个溶解度（x（单位摩尔分数））-压力(p)-温度(T)面，表明其在固相中发生相变。用正己烷分别绘制为：lnx+5.087-8.426 × 10^3(p/MPa)-15.385 × 10^<-6>(p/MPa)（高压低温）lnx-10.9612+943.881(T/K)+[261(T/K)-0.0724](p/MPa)（低压高温）。下一步，还对C60作为溶剂的高压溶解度进行了测定。它显示了表面的断裂，表明在高压和甲苯中的C60下发生了相变。相变后溶解度增加，但在甲苯中的溶解度降低。高压溶解度的这种差异表明，与饱和溶液共存的溶剂化固体的结构彼此不同。

项目成果

澤村精冶, 藤田信幸: "溶解挙動からみたC60-トルエン系のp-T相図"高圧力の科学と技術. 12(特). 186-186 (2002)

Seiji Sawamura、Nobuyuki Fujita：“从溶解行为角度看C60-甲苯体系的P-T相图”，高压科学与技术12（特别版）。

澤村精冶, 重松公司: "ピストン・シリンダ型高圧容器を用いたベンゼンの固液圧縮挙動の観察"日本材料学会第53期学術講演会講演論文集. 70-71 (2004)

Seiji Sawamura，重松株式会社：“使用活塞缸型高压容器观察苯的固液压缩行为”日本材料学会第 53 届学术会议论文集 70-71（ 2004）

H.Matsuo, H.Kouno, S.Sawamra: "High-pressure solubility of L-alpha-alanine and beta-alanine in water"Rev. High Pressure Sci. Tech. (2003)

H.Matsuo、H.Kouno、S.Sawamra：“L-α-丙氨酸和 β-丙氨酸在水中的高压溶解度”Rev。

澤村精治, 松尾博史: "体積の立場から見た疎水性水和"高圧力の科学と技術. 13(2). 157-164 (2003)

Seiji Sawamura、Hiroshi Matsuo：“从体积角度看疏水水合”高压科学与技术 13(2) 157-164 (2003)。

S.Sawamra, T.Yamashita: "Evaluation of high-pressure viscometer ofrolling ball type using water as sample"52nd Gakujutu Kouen Ronbunshu(Soc.Material Sci, Jpn). (special Issure). (2003)

S.Sawamra、T.Yamashita：“以水为样品的滚球型高压粘度计的评价”第 52 届学术公演论文集（Soc.Material Sci，Jpn）。