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.
|
PDF
la0c03660_si_001.pdf - Published Supplemental Material Download (14MB) | Preview |
|
|
PDF
Langmuir_37_6874-6886_2021.pdf - Published Version Download (13MB) | Preview |
Abstract
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 |
Actions (login required)
 |
View Item |
