Kinetics and Dynamics of Pressure-induced Phase Transition in Amphiphilic Systems

两亲体系中压力诱导相变的动力学和动力学

• 批准号: 12640377
• 负责人: SETO Hideki
• 金额: $ 0.83万
• 依托单位: KYOTO UNIVERSITY (2002)Hiroshima University (2000-2001)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640377/
• 关键词: small-angle neutron scattering; neutron spin echo; semi-microscopic structure; amphiphile; microemulsion; pressure-induced transition; phospholipids; swollen gel phase; メゾスコピック構造

Amphiphilic molecules such as surfactants and lipids conform various semi-microscopic scale structures with oil and water. A ternary microemulsion composed of AOT (Aerosol-OT), water and decane has a water-in-oil droplet structure at ambient temperature and pressure, and separates into two phases with increasing either temperature or pressure. In order to clarify the mechanisms of these transitions, neutron spin echo experiments have been carried out. The results could be interpreted that the microscopic origins of pressure-induced and temperature-induced transitions are different.We also investigated the system composed of non-ionic surfactant C_<12>E_5, D_2O, and octane by mean of small-angle neutron scattering. The effects of temperature and pressure were opposite unlike the case of AOT. A pressure-induced hexagonal phase was shown for the first time.A structural change of an aqueous solution of DPPC with adding ethanol and varying temperature and pressure were investigated by means of small-angle neutron scattering and small-angle X-ray scattering. A swollen gel phase, in which the lamellar repeat distance is slightly larger than the known phase, was identified at moderate temperature and pressure for the first time.

两亲性分子如表面活性剂和脂质与油和水形成各种半微观尺度的结构。由AOT（Aerosol-OT）、水和正癸烷组成的三元微乳液在常温常压下呈油包水液滴结构，随温度或压力的升高分为两相。为了阐明这些转变的机制，进行了中子自旋回波实验。我们还用小角中子散射研究了非离子表面活性剂<12>C_E_5、D_2O和辛烷组成的体系。与AOT的情况不同，温度和压力的影响相反。利用小角中子散射和小角X射线散射研究了DPPC水溶液在不同温度和压力下，随着乙醇的加入而发生的结构变化.在中等温度和压力下首次发现了一种溶胀的凝胶相，其中层状重复距离略大于已知相。

项目成果

S.Komura, T.takeda, Y.Kawabata, S.K.Ghosh, H.Seto, M.Nagao: "Dynamical fluctuation of the mesoscopic structure in ternary C_<12>E_5-water-n-octane amphiphilic system"Physical Review E. 63. 41402 (2001)

S.Komura、T.takeda、Y.Kawabata、S.K.Ghosh、H.Seto、M.Nagao：“三元 C_<12>E_5-水-正辛烷两亲体系中介观结构的动态涨落”Physical Review E.

T.Takeda, Y.Kawabata, H.Seto, S.Kimura, M.Nagao: "Neutron Spin Echo Investigations on Dynamics in Ternary C_<12>E_5/n-octane/D_2O and DPPC/D_2O/CaCl_2 Amphiphilic Systems"Journal of the Physical Society of Japan. 70,Supple.A. 323-325 (2001)

T.Takeda、Y.Kawabata、H.Seto、S.Kimura、M.Nagao：“三元 C_<12>E_5/n-octane/D_2O 和 DPPC/D_2O/CaCl_2 两亲体系动力学的中子自旋回波研究”期刊

T. Takeda, N. Yamada, H. Seto, Y. Kawabata: "Development of spin flippers with steady current for the TOF-NSE spectrometer"Physica B. to be published.

T. Takeda、N. Yamada、H. Seto、Y. Kawabata：“用于 TOF-NSE 光谱仪的稳定电流旋转翻转器的开发”Physica B. 即将出版。

Y.Kawabata, M.Nagao, H.Seto, T.Takeda: "NEUTRON SPIN ECHO STUDIES ON EFFECTS OF TEMPERATURE AND PRESSURE IN DYNAMICS OF A TERNARY MICROEMULSION"Studies in Surface Science and Catalysis. 132. 209-212 (2001)

Y.Kawabata、M.Nagao、H.Seto、T.Takeda：“中子自旋回波研究三元微乳液动力学中温度和压力的影响”表面科学和催化研究。

M. Nagao, H. Seto, Y. Kawabata, T. Takeda: "Temperature and Pressure Effects on Structural Formations in a Ternary Microemulsion"Journal of Applied Crystallography. 33. 653-656 (2000)

M. Nagao、H. Seto、Y. Kawabata、T. Takeda：“温度和压力对三元微乳液结构形成的影响”应用晶体学杂志。