Scattering from Dilute and Lamellar Phase Solutions of Aerosol-OT Simultaneous Probe of Surface Structures and Bulk
2011 (English)In: Trends in colloid andinterface science XXIV / [ed] Viktor Starov, Karel Procházka, 2011, Vol. 138, 139-142 p.Conference paper (Refereed)
The benefits of simultaneous studies of adsorbed layers and bulk structures are shown for solutions of the surfactant Aerosol-OT. Above the critical micelle concentration, Aerosol-OT forms an aligned lamellar phase at the sapphire/solution interface which is in equilibrium with a bulk phase that consists of coexisting micellar solution and dispersed lamellar phase. Measurements of the aligned surface layers and the bulk scattering from a 2% wt solution by grazing incidence and small-angle neutron scattering show that the bulk consist of lamellar structures with the same d-spacing as seen at the surface but without the surface induced alignment. The surface lamellar structure corresponds to a 10% volume fraction for a 2% wt bulk which implies that there must be coexistence of regions of different concentration. Scattering patterns measured in grazing incidence geometry clearly show the relative contributions from small-angle scattering and specular reflectivity.
Place, publisher, year, edition, pages
2011. Vol. 138, 139-142 p.
, Progress in Colloid and Polymer Science, ISSN 0340-255X ; 138
sodium bis 2-ethylhexyl sulfosuccinate, lamellar phase, scattering
IdentifiersURN: urn:nbn:se:uu:diva-160883DOI: 10.1007/978-3-642-19038-4_24ISI: 000295091800024ISBN: 9783642190377OAI: oai:DiVA.org:uu-160883DiVA: diva2:453430
24th Meeting of the European-Colloid-and-Interface-Society (ECIS), September 5-10, 2010, Prague, Czech Republic