Properties of high-pressure solvents for fullerenes
| Project/Area Number |
14540550
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
物質変換
|
|---|
| Research Institution | Ritsumeikan University |
|---|
Principal Investigator |
SAWAMURA Seiji Ritsumeikan Univ., Fac Science and Engineering, Professor, 理工学部, 教授 (10167439)
|
|---|
| Project Period (FY) |
2002 – 2003
|
| Project Status |
Completed (Fiscal Year 2003)
|
| Budget Amount *help |
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
|
|---|
| Keywords | Fullerene / High pressure / Solubilitv / Pressure dependence / フラーレン / 相転移 / 相平衡 / 溶媒和結晶 |
|---|
| Research Abstract |
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.
|
Report
(3 results)
Research Products
(19 results)
