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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.33: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

Depletion induced sphere-cylinder transition in C12E5 microemulsion: A Small-Angle X-ray Scattering study — •Masoud Amirkhani¹, Soheil Sharifi¹, Sergio Funari², and Othmar Marti¹ — ¹Institut für Experimentelle Physik, Universität Ulm, Albert-Einstein-Allee 11 89081 Ulm — ²HASYLAB, Notkestrasse 85, D-22607 Hamburg, Germany

Small-angle X-ray scattering was used to study the mixture of C12E5 (pentaethylene glycolmonododecyl ether)/H2O/n-decane microemulsion and polyethylene glycol (PEG). The size, shape and the structure factor of the microemulsion were investigated by adding the polymer (PEG) to the mixture. Attractive depletion potential was induced between the microemulsion droplets by the non-adsorb polymer. The range and strength of the attractive potential were changed by varying the molecular weight and concentration of PEG. The forward scattering, S(0), of the spherical microemulsion, declined gradually as the polymer concentration decreased. For PEG with the molecular weight of Mn = 285-315, the microemulsion morphology remained spherical, but the main peak of the structure factor moved towards a bigger q. When PEG with molecular weights of Mn = 2200 and Mn = 6000 were used, a shape transition from spherical to cylindrical was induced in line with increasing polymer concentration.