Slow Dynamics in Complex Fluids

本文介绍了日本原子力科学研究所JRR-3 M CZ_2端口中子自旋回波（NSE）谱仪的改进工作，并与法国格勒诺布尔ILL和德国柏林HMI合作建造了新的单色器，对其性能进行了测试，结果表明，与改进前的单色器相比，新单色器的极化中子通量提高了3倍。我们在法国Saclay的LLB实验室用MESS进行的NSE实验表明，我们的NSE谱仪的性能与MESS相当。为了进一步获得中子强度，我们安装了一个位置灵敏探测器组件的探测器系统。我们已经进行了NSE实验，以研究涉及两亲物的复杂流体中的慢动力学，如膜波动。对二棕榈酰磷脂酰胆碱（DPPC）-水-CaCl_2体系、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片层相以及DPPC/水体系的密液滴相，由IISE实验得到的中间相关函数I（Q，t）符合方程I（Q，t）=I（Q，O）[（GAMMA t）~（2/3）]<12>。离子型表面活性剂AOT /正癸烷/水体系的温度诱导层片相和压力诱导层片相。弛豫速率Gamma随Q_3的增大而增大。从这些结果来看，Zilman和Granek的理论，其中他们使用Heifrich弯曲自由能来描述海绵相和层状相的膜波动，首次得到了我们NSE实验的支持。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，O）[（&lt;$MAt）3/4]和&lt;$MA随Q ^&lt;8/3&gt;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 CZ_2 port of JRR-3M, JAERI.Performance tests of the new monochromator constructed in collaboration with ILL, Grenoble, France and HMI, Berlin, Germany indicate a threefold increase in polarized neutron flux at the sample compared to the previous one. Our NSE experiments using MESS at LLB in Saclay, France showed that the performance of our NSE spectrometer was comparable to that of MESS.In order to further gain neutron intensity, we have been installing a detector system with an assembly of position sensitive detectors.NSE 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 IiSE.experiments were well fitted to the equation I(Q,t) =I(Q,O)[(GAMMAt)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 nonionic 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 swfactant AOT / n-decane / water system. The relaxation rate GAMMA increased as Q_3. From these results, the theory of Zilman and Granek, in which they use the Heifrich bending free energy to describe membrane undulations in sponge and lamellar phases, was first supported by o ur 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,O)[(GAMMAt)3/4]and GAMMA increased as Q ^<8/3> are also explained by their theory for 1-dimensional polymer-like model.