Slow Dynamics in Complex Fluids

复杂流体中的慢速动力学

• 批准号: 08044087
• 负责人: TAKEDA Takayoshi
• 金额: $ 4.48万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044087/
• 关键词: neutron spin echo; slow dynamics; Complex Fluids; dynamic structure factor; membrane; microemulsion; amphiphiles; surfactant; 中性子散乱; 両親媒分子; 両親媒

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.

我们一直在改进 JAERI JRR-3M CZ_2 端口的中子自旋回波 (NSE) 光谱仪。与法国格勒诺布尔的 ILL 和德国柏林的 HMI 合作建造的新型单色仪的性能测试表明，与之前的相比，样品中的偏振中子通量增加了三倍。我们在法国萨克雷法学院使用 MESS 进行的 NSE 实验表明，我们的 NSE 光谱仪的性能与 MESS 相当。为了进一步获得中子强度，我们一直在安装一个带有位置敏感探测器组件的探测器系统。NSE 实验的目的是研究涉及两亲物的复杂流体中的缓慢动力学，例如膜波动。对于二棕榈酰磷脂酰胆碱(DPPC)-水-CaCl_2体系以及低温和高温双连续微乳液相和非离子的层状相，从我们的IiSE实验中获得的中间相关函数I(Q,t)很好地拟合方程I(Q,t)=I(Q,O)[(GAMMAt)2/3] 表面活性剂C_ 12 E_5/正辛烷/水体系，也适用于离子表面活性剂AOT/正癸烷/水体系的致密液滴相、温度诱导的和压力诱导的层状相。弛豫率 GAMMA 随着 Q_3 的增加而增加。根据这些结果，Zilman 和 Granek 的理论（他们使用海弗里希弯曲自由能来描述海绵相和层状相的膜波动）首先得到了我们的 NSE 实验的支持。我们利用他们的理论估计了膜的弯曲模量。对于具有蠕虫状胶束的非离子表面活性剂C_<16>E_7的水溶液，I(Q,t)=I(Q,O)[(GAMMAt)3/4]和GAMMA随着Q^<8/3>而增加的结果也可以用他们的一维类聚合物模型理论来解释。

项目成果

H.Seto: "A pressure induced phase transition in a temary microemulsion with an assembly of a new high pressure cell and small angle X-ray scattering apparatus." Jpn. J.Appl. Phys.38. 951-95〓 (1999)

H.Seto：“采用新型高压池和小角度 X 射线散射装置的压力诱导相变 J.Appl.38”。

H.Seto: "Crossover from mean field to three-dimentional Ising critical behavior in a three-component microemulsion system" Phys.Rev.E. 54. 629-633 (1996)

H.Seto：“三组分微乳液系统中从平均场到三维 Ising 临界行为的交叉”Phys.Rev.E。

T.Takeda: "A neutron spin echo spectrometer with an assembly of position sensitive detectors" J.Phys.Soc.Jpn.65, Supple.A. 189-194 (1996)

T.Takeda：“带有位置敏感探测器组件的中子自旋回波谱仪”J.Phys.Soc.Jpn.65，Supple.A。

T.Takeda: "Improvement of neutron echo spectrometer at C2-2 of JRR3M" J.Phys.Chem.Solids.(in press).

T.Takeda：“JRR3M C2-2 处中子回波谱仪的改进”J.Phys.Chem.Solids.（印刷中）。

T.Tkeda: "Neutron spin echo investigations on the slow dynamics in complex fluids involving amphiphiles" Slow Dynamics in Complex Systems, eds.M.Tokuyama and I.Oppenheim, AIP Conf.Proc.(in press).

T.Tkeda：“涉及两亲物的复杂流体中的慢动力学的中子自旋回波研究”复杂系统中的慢动力学，M.Tokuyama 和 I.Oppenheim 编辑，AIP Conf.Proc.（出版中）。