Shear-induced ordering of nano-pores and instabilities in surfactant mesh phases

Bera, Pradip K. and Rathee, Vikram and Krishnaswamy, Rema (2020) Shear-induced ordering of nano-pores and instabilities in surfactant mesh phases. pp. 1-39.

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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.

Item Type: Article
Uncontrolled Keywords: Mixed surfactant systems, Mesh phases, Shear, Rheo-SAXS, Rheo-SALS
Subjects: Natural Sciences > Chemistry & allied sciences
Divisions: Azim Premji University > School of Arts and Sciences
Depositing User: Mr. Sachin Tirlapur
Date Deposited: 28 Aug 2020 11:07
Last Modified: 28 Aug 2020 11:07
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