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Shear-Induced Ordering of Nanopores and Instabilities in Concentrated Surfactant Mesh Phases

Bera, PK and Rathee, V and Krishnaswamy, R and Sood, AK (2021) Shear-Induced Ordering of Nanopores and Instabilities in Concentrated Surfactant Mesh Phases. In: Langmuir, 37 (23). pp. 6874-6886.

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Official URL: https://doi.org/10.1021/acs.langmuir.0c03660


Mixed surfactant systems with strongly bound counterions show many interesting phases such as the random mesh phase consisting of a disordered array of defects (water-filled nanopores 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 a high degree of coherence between nanopores in three dimensions. In situ small-angle synchrotron X-ray study under different shear stress conditions shows sharp Bragg peaks in the X-ray diffraction, successfully indexed to the rhombohedral lattice with R3¯ m space group symmetry. The ordered mesh phase shows isomorphic twinning and buckling at higher shear stress. Our experimental studies bring out rich non-equilibrium phase transitions in concentrated cationic surfactant systems with strongly bound counterions hitherto not well explored and provide motivation for a quantitative understanding. ©

Item Type: Journal Article
Publication: Langmuir
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to American Chemical Society
Keywords: Cationic surfactants; Nanopores; Shear stress, Degree of coherence; Disordered arrays; Mixed surfactant systems; Nonequilibrium phase transitions; Rhombohedral lattice; Space-group symmetry; Synchrotron x rays; Water-filled nanopores, Mesh generation
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 04 Aug 2021 10:42
Last Modified: 04 Aug 2021 10:42
URI: http://eprints.iisc.ac.in/id/eprint/69031

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