Mihailescu Mihaela, Monkenbusch Michael, Allgaier Jürgen, Frielinghaus Henrich, Richter Dieter, Jakobs Britta, Sottmann Thomas
Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Oct;66(4 Pt 1):041504. doi: 10.1103/PhysRevE.66.041504. Epub 2002 Oct 30.
Lamellar phases consisting of water and oil with intervening surfactant monolayer interfaces (eventually containing low molecular weight amphiphilic block-copolymers) are studied. Structural and dynamical investigations of oriented lamellar phases at the length scale of the intermembrane distance and beyond are performed using small-angle neutrons scattering and neutron spin-echo spectroscopy. The data analysis in terms of static and dynamic structure factors for a stack of elastic interfacial membranes yields information of the membrane curvature elasticity and membrane interactions in terms of phenomenological parameters such as the bending elastic modulus kappa and compression modulus (-)B, and on the dissipation related to the viscosity eta. The influence of the block-copolymers anchored to the surfactant monolayers is studied for a series of lamellar phase microemulsions containing equal volume fraction of surfactant and polymer, by varying only the polymer molecular weight. Based on numerical evaluations and fits to the data the conditions of applicability of the available theoretical concepts are discussed.
研究了由水和油组成、中间有表面活性剂单分子层界面（最终含有低分子量两亲性嵌段共聚物）的层状相。使用小角中子散射和中子自旋回波光谱对跨膜距离及更大长度尺度上的取向层状相进行结构和动力学研究。根据弹性界面膜堆叠的静态和动态结构因子进行数据分析，得出膜曲率弹性和膜相互作用的信息，这些信息以诸如弯曲弹性模量κ和压缩模量（-）B等唯象参数表示，还得出与粘度η相关的耗散信息。通过仅改变聚合物分子量，研究了锚定在表面活性剂单分子层上的嵌段共聚物对一系列含有等体积分数表面活性剂和聚合物的层状相微乳液的影响。基于数值评估和对数据的拟合，讨论了现有理论概念的适用条件。
