Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 9: POSTER: Colloids and Nanoparticles
CPP 9.5: Poster
Monday, March 26, 2007, 16:00–18:00, Poster B
Microstructure studies of microemulsions for decontamination — •Stefan Wellert1, Henrik Imhof1, Andre Steppin1, Thomas Hellweg1, Michael Dolle2, Hans-Juergen Altmann2, and Andre Richardt2 — 1TU Berlin, Stranski-Labor, Strasse des 17. Juni 124, D-10623 Berlin — 2Armed Forces Scientific Institute, (NBC-Protection) P.O.Box 1142, D-29623 Munster
A growing field of interest is the use of microemulsions as new and more efficient decontamination media for a variety of toxic compounds, for example organophosphorous agents. Because of the large internal surface water-in-oil microemulsions and bicontinuous structures are of interest for the mentioned application. In order to form environmentally compatible and effective decontamination media we studied the phase behavior of quaternary systems consisting of water, surfactant (IHF, APG), cosurfactant (2-propanol, pentanol) and different oils. The identified stable one-phase regions were investigated with scattering methods. To gain insight in the phase structures SAXS, DLS and SANS measurements were performed as a function of surfactant, cosurfactant and water content. A large internal surface is essential for a fast and efficient decontamination process. This large contact area between the contaminants solubilized in the oil phase and the active agents in the water phase leads to a strong influence of the structure factor S(q). Due to this SANS contrast variation experiments were performed to extract the influence of the structure factor on the form factor signal. The results of these measurements are related to the measured efficiencies of the decontamination process.