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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: POSTERS Driven Soft Matter

CPP 20.31: Poster

Wednesday, February 27, 2008, 16:00–18:30, Poster A

Transitions of Smectic Systems under Shear Investigated by Nuclear Magnetic ResonanceBruno Medronho1,2, Shahram Shafaei3, Gönül Ar3, Michael Blaschke3, Ulf Olsson2, and •Claudia Schmidt31Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal — 2Physical Chemistry 1, Center of Chemistry and Chemical Engineering, Lund University, Box 124, 221 00 Lund, Sweden — 3Department of Chemistry, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany

Smectic phases driven by shear show interesting structural transitions. Most interesting is the formation of monodisperse, close-packed, multilamellar vesicles (MLVs), also called onions, that is found in many lyotropic lamellar phases [1]. Other systems show transitions between different orientations of planar layers, when parameters such as shear rate or temperature are changed. These dynamic transitions, which can be continuous or discontinuous, have been investigated by deuterium NMR spectroscopy [2]. Results for the shear-induced formation and destruction of MLVs in an aqueous solution of the nonionic surfactant C10E3 will be presented [3].

[1] O. Diat, D. Roux, and F. Nallet, J. Physique IV, 3, 193 (1993).

[2] S. Müller, Claus Börschig, Wolfram Gronski, Claudia Schmidt, and D. Roux, Langmuir, 15, 7558 (1999).

[3] B. Medronho, S. Shafaei, R. Szopko, M. G. Miguel, U. Olsson, C. Schmidt, in preparation.

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