Incollection,

Nonequilibrium pattern formation in active Langmuir monolayers

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Abstract Book of the XXIII IUPAP International Conference on Statistical Physics, Genova, Italy, (9-13 July 2007)

Abstract

Langmuir monomolecular layers, formed by amphiphilic molecules at liquid-air interfaces and containing a fraction of chiral molecules, are theoretically investigated. These monolayers can be brought out of thermal equilibrium by applying a gradient of small molecules across the interface, resulting in the leakage flow. A new theoretical description is introduced for this nonequilibrium soft matter system, taking into account the changes of the tilt of chiral molecules as well as the splay coupling between the concentration field and the orientation. Complex wave behavior like multi-armed rotating spirals has been found in numerical simulations. Close to the transition to the untilted condensed phase the splay coupling may give rise to the reproduction of topological defects.

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