Issue 22, 2009

Shear rheology of amphiphilic cubic liquid crystals from large-scale kinetic lattice–Boltzmann simulations

Abstract

We investigate the rheological characteristics of ternary amphiphilic gyroid, diamond and primitive cubic phases under applied Couette flow simulated using a kinetic lattice–Boltzmann model and periodic Lees–Edwards boundary conditions. The simulated rheological response of the cubic phases is compared to experimental observations in lyotropic liquid crystals. We relate the variations in the non-Newtonian response and deformation under strain in these cubic phases to their triply bicontinuous cubic morphologies as well as to the differences in the interaction parameters between the three species present in the amphiphilic system. The large system sizes allow simulation of multiple domains which elucidate the correlation between the evolution of the defect texture and the change in the stress field of the cubic phase under applied Couette flow.

Graphical abstract: Shear rheology of amphiphilic cubic liquid crystals from large-scale kinetic lattice–Boltzmann simulations

Supplementary files

Article information

Article type
Paper
Submitted
19 Jun 2009
Accepted
18 Sep 2009
First published
08 Oct 2009

Soft Matter, 2009,5, 4446-4463

Shear rheology of amphiphilic cubic liquid crystals from large-scale kinetic lattice–Boltzmann simulations

R. S. Saksena and P. V. Coveney, Soft Matter, 2009, 5, 4446 DOI: 10.1039/B911884E

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