Bicontinuous Structure and Dynamics in Complex Fluids of Ternary Amphiphilic Systems

我们一直在改进日本JRR-3M的C_&lt；2-2&gt；端口的中子自旋回波谱仪。利用这一装置安装了一个用于研究复杂流体中的中子自旋回波谱的高压室。对于二棕榈酰磷脂酰胆碱(DPPC)-水-CaCl2体系，对于低温和高温双连续微乳液相和非离子表面活性剂C_&lt；12&gt；E_5/正辛烷/水体系，以及离子表面活性剂AOT/正庚烷/水体系的致密液滴相、温度诱导层状相和压力诱导层状相。由这些结果，我们的NSE实验首次支持了Zilman和Granek的理论，即他们用Helfrich弯曲自由能来描述海绵和片层相中的薄膜起伏。我们用它们的理论估算了膜的弯曲模数。对于具有蠕虫状胶束的非离子表面活性剂C_&lt；16&gt；E_7的水溶液，I(q，t)=I(q，0)exp[(-gt)^&lt；3/4&gt；]和G随Q^&lt；8/3&gt；的一维聚合物模型的理论而增加。

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.