Bera, Pradip K. and Rathee, Vikram and Krishnaswamy, Rema
(2020)
Shear-induced ordering of nano-pores and instabilities in
surfactant mesh phases.
arXiv.
pp. 1-39.
Abstract
Mixed surfactant systems show many interesting phases such as the random mesh phase con
sisting of a disordered array of defects (water-filled nano-pores in the bilayers). The present study
addresses the non-equilibrium phase transition of the random mesh phase under shear to an ordered
mesh phase with high degree of coherence between defects in three dimensions. In-situ small-angle
synchrotron X-ray diffraction under different shear stress conditions shows sharp Bragg peaks in X-ray diffraction, successfully indexed to the rhombohedral lattice with the R¯3m space group sym
metry. The ordered mesh phase shows isomorphic twinning and buckling at higher shear stress.
Our experimental studies bring out rich phase transitions in concentrated mixed surfactant systems
hitherto not well explored and provide motivation for a quantitative understanding.
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