Structure of Fluid Membranes under Confinement and Shear Studied in the Second Generation X-ray Surface Forces Apparatus (XSFA-II) Conference Paper uri icon


  • The second generation X-ray Surface Forces Apparatus (XSFA-II) has been developed to allow in-situ small angle x-ray scattering (SAXS) and surface forces measurements on complex fluids under static confinement and/or oscillatory shear conditions in a controlled temperature and chemical vapor environment.(Idziak, SHJ, et al., Science), 264, 1915-8, 1994 As a model lubricant system, multi-layered membrane systems composed of surfactant- oil-water mixtures have been studied using the XSFA-II. In a regime where the gap is large compared to the lamellar domains, we observed a rupture of the film into shear conforming near surface regions and a non-confined bulk region. This structure will be further investigated using a linearly focused x-ray microbeam generated by the newly developed Bragg-Fresnel optics in glancing incidence small angle x-ray diffraction experiments …

publication date

  • January 1, 2000