Bicontinuous Structure and Dynamics in Complex Fluids of Ternary Amphiphilic Systems

利用该项目，我们在JRR-3 M实验室C口改进了中子自旋回波（NSE）谱仪<2-2>，并安装了用于复杂流体中NSE研究的高压池，进行了NSE和小角散射实验，研究了复杂流体中包含两亲分子的膜起伏等慢动力学过程。对于二棕榈酰磷脂酰胆碱（DPPC）-水-CaCl_2体系以及非离子表面活性剂C_ E_5/正辛烷/水体系的低温、高温双连续微乳液相和层片相，NSE实验得到的中间相关函数I（Q，t）符合方程I（Q，t）=I（Q，0）exp[（-Gt）^&lt;2/3&gt;]<12>，也适用于AOT /正癸烷/水体系的致密液滴相、温度诱导相和压力诱导相的片层相。弛豫速率G随着Q^3的增大而增大。从这些结果中，Zilman和Granek的理论，其中他们使用的Helfrich弯曲自由能来描述在海绵和层状相的膜波动，是第一次支持我们的NSE实验。我们估计的弯曲模量的膜使用他们的理论。对于非离子表面活性剂C_<16>E_7的蠕虫状胶束水溶液，I（Q，t）=I（Q，0）exp[（-Gt）^&lt;3/4&gt;]和G随Q^&lt;8/3&gt;而增大的结果也用一维聚合物模型理论解释。

We have been improving a neutron spin echo (NSE) spectrometer at C_<2-2> port of JRR-3M, JAERI.A high-pressure cell for NSE studies in comlex fluids was installed using this grant.NSE and small angle scattering experiments have been performed to study the slow dynamics such as membrane undulation in complex fluids involving amphiphiles. Intermediate correlation functions I(Q,t) obtained from our NSE experiments were well fitted to the equation I(Q,t)=I(Q,0)exp[(-Gt)^<2/3>] for the dipalmitoylphosphatidylcholine (DPPC)-water-CaCl_2 system and for the low temperature and high temperature bicontinuous microemulsion phases and the lamella phase of the non-ionic surfactant C_<12>E_5/n-octane / water system, and also for the dense droplet phase of, the temperature-induced and the pressure-induced lamella phases of the ionic surfactant AOT / n-decane / water system. The relaxation rate G increased as Q^3. From these results, the theory of Zilman and Granek, in which they use the Helfrich bending free energy to describe membrane undulations in sponge and lamellar phases, was first supported by our NSE experiments. We estimated the bending modulus of the membranes using their theory. For aqueous solutions of non-ionic surfactant C_<16>E_7 with wormlike micelles, the results that I(Q,t)=I(Q,0)exp[(-Gt)^<3/4>] and G increased as Q^<8/3> are also explained by their theory for 1-dimensional polymer-like model.