Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Focus: Amphiphilic Systems I
CPP 1.3: Vortrag
Montag, 23. März 2009, 11:30–11:45, ZEU 222
Microemulsions near planar surfaces — •Michael Kerscher1, Henrich Frielinghaus2, and Dieter Richter1 — 1Institute for Solid State Research, Forschungszentrum Jülich GmbHm D-52425 Jülich — 2Jülich Centre of Neutron Science, Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, D-85747 Garching
Microemulsions have a great variety of uses in industrial application. Most of these applications like oil productions and cleaning imply the presence of huge surfaces. The influence of such surfaces on the domain structure of microemulsions is studied using the example of a planar, hydrophilic wall. In our studies, it shows that the ordering near the wall is locally elevated, while the bulk state is reached far from the surface. Using neutron reflectometry and grazing incidence small angle neutron scattering (GISANS) the alternating domain sequence and the lateral order in the sample is recorded. The sample is studied in GISANS, where we varied the overall scattering length density in order to vary the penetration depth of the evanescent wave, while the bulk contrast remains dominating. In this way the lateral order is resolved as a function of the depth, and the local ordering near the surface can be resolved. These measurements are the first of their kind. The reflectometer measurements aim mainly at the structure in the normal direction. Thus, the thickness of a ordered phase near the surface can be measured. The collected information will be used to improve the microemulsion behavior near surfaces in the static state and under flow. By using amphiphilic polymers as additives the response of the system to the surface and the flow will be tailored.