Dynamics of Morphology Transition of Complex Liquids

复杂液体形态转变动力学

• 批准号: 12304021
• 负责人: IMAI Masayuki
• 金额: $ 5.99万
• 依托单位: OCHANOMIZU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 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-12304021/
• 关键词: Soft Matter; Morphorogy Trangition; Pretransition Phenomenon; Lamellar Phase; Double-Gyroid Phase; Kfluctration; Depletion interaction; Microemlusiton; 複雑液体; 相転移ダイナミクス; 棒状粒子; 界面活性剤; ラメラ; ジャイロイド; 小角X線散乱; シミュレーション

The target of this research project is to reveal dynamics of morphology transitions in complex liquids (soft matter). For this purpose we investigated the following three systems.1. Order-order transition of surfactant/water systems and block copolymers.Characteristic fluctuation modes are observed prior to an order-order transition. Which brings the destination ordered phase through a meta stable intermediate phase. This behavior is well described by the Gintzburg-Landau scheme. Furthermore we developed a mode expansion theory, which reveals the kinetic pathway of the order-order transition.2. Morphology transition of rod partical + polymer system.Addition of polymer to the rod particle suspension brings isotropic to nematic transition. This phenomenon is induced by compentition between translational entropy and mixing entropy(depletion interaction). We found that the semi-rigid polymer enhances the depletion interaction extensively (^~10^<3-4>) due to the large excluded volume effect.The Monte-Carlo simulation reproduces the observed phenomenon as a function of the chain rigidity.3. Morphology transition of membrane + polymer system.Using microemulsion droplet phase, we can confine polymer chains into a nano-scale closed spherical container. The entropy loss of the polymer chain due to the confinement brings morphology transition in order to minimize the total free energy consisting of conformational entropy of the chain and elastic energy of the membrane.

本研究项目的目标是揭示复杂液体（软物质）中形态转变的动力学。为此，我们研究了以下三个系统。表面活性剂/水体系和嵌段共聚物的序序过渡。特征波动模式在序阶跃迁之前被观察到。它将目标有序阶段带入一个元稳定的中间阶段。Gintzburg-Landau格式很好地描述了这种行为。此外，我们还建立了模态展开理论，揭示了序序转换的动力学途径。棒状颗粒+聚合物体系的形态转变。在棒状颗粒悬浮液中加入聚合物使各向同性向列相转变。这种现象是由平动熵和混合熵之间的竞争（耗尽相互作用）引起的。我们发现，由于大的排除体积效应，半刚性聚合物广泛地增强了耗尽相互作用（^~10^<3-4>）。蒙特卡罗模拟再现了观察到的现象作为链刚度的函数。膜+聚合物体系的形态转变。利用微乳液液滴相，我们可以将聚合物链限制在一个纳米尺度的封闭球形容器中。约束使聚合物链的熵损失引起形态转变，以使链的构象熵和膜的弹性能组成的总自由能最小。

项目成果

M.Nonomura 他: "Growth of Mesophases in Morphological Transitions"J. Physics : Condensed Matter. 13. 9089-9112 (2001)

M. Nonomura 等人：“形态转变中的中间相的生长”J. 物理学：凝聚态物质。 13. 9089-9112 (2001)

M.Imai 他: "Shear-Induced Ordering of Lamellar and Gyroid Structures Observed in a Nonionic Surfactant System"European Physical Journal B. 5. 391-402 (2001)

M. Imai 等人：“在非离子表面活性剂系统中观察到的层状和螺旋结构的剪切诱导排序”欧洲物理杂志 B. 5. 391-402 (2001)

M. Imai et al.: "Effects of Guest hydrophobic Molecule on Stability of Ordered Meso Structure of a Surfactant/Water System"J. Chem. Phys.. in press.

M. Imai 等：“客体疏水分子对表面活性剂/水体系有序内观结构稳定性的影响”J。

N. Urakami et al.: "The Effect of the Sphere Size on the Phase Behaviors in the Rod and Sphere Mixture System"Journal of Marromolecular Science, Physics edition. in press.

N. Urakami 等人：“球体尺寸对棒和球体混合系统中相行为的影响”Marromolecular Science 杂志，物理版。

M. Imai et al.: "Fluctuations of lamellar structure prior to a lamellar->gyroid transition in a nonionic surfactant system"Phys. Rev. E. 62. 6865-6874 (2000)

M. Imai 等人：“非离子表面活性剂体系中层状->螺旋转变之前层状结构的波动”Phys。