laboratoire de physique statistique
 
 
laboratoire de physique statistique

Publications

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Martine BEN AMAR 


EPL 


2
P U B L I C A T I O N S

S E L E C T I O N N E R
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2010
Instability patterns in ultrathin nematic films: Comparison between theory and experiment - Manyuhina, O. V. and Cazabat, A. -M. and Ben Amar, M.
EPL 92 (2010) 
LPS


Abstract : Motivated by recent experimental observations (Delabre U. et al., Langmuir, 24 (2008) 3998), we reconsider an instability of ultrathin nematic films, spread on liquid substrates. Within a continuum elastic theory of liquid crystals, in the harmonic approximation, we find an analytical expressions for the critical thickness as well as for the critical wave number, characterizing the onset of instability towards the stripe phase. Comparing theoretical predictions with experimental observations, we establish the utility of surface-like term such as an azimuthal anchoring. Copyright (C) EPLA, 2010
 
2007
Periodic lipidic membrane tubes - Campelo, F. and Allain, J. -M. and Ben Amar, M.
EPL 77 (2007) 
LPS


Abstract : We investigate the formation of two-phase lipidic tubes of membrane in the framework of the Canham-Helfrich model. The two phases have different elastic moduli (bending and Gaussian rigidity), different tensions and a line tension prevents the mixing. For a set of parameters close to experimental values, periodic patterns with arbitrary wavelength can be found numerically. A wavelength selection is detected via the existence of an energy minimum. When the chemical composition induces an important enough size disequilibrium between both phases, a segregation into two half infinite tubes is preferred to a periodic structure. Copyright (C) EPLA, 2007.