Rheological response and dynamics of the amphiphilic diamond phase from kinetic lattice-Boltzmann simulations.
P ROY SOC A-MATH PHY
1977 - 2002.
The purpose of the present paper is to report on the first computational study of the dynamical and rheological response of a self-assembled diamond mesophase under Couette flow in a ternary mixture composed of oil, water and an amphiphilic species. The amphiphilic diamond mesophase arises in a wide range of chemical and biological systems, and a knowledge of its rheological response has important implications in materials science and biotechnological applications. The simulations reported here are performed using a kinetic lattice Boltzmann method. Lyotropic liquid crystals exhibit characteristic rheological responses in experiments that include shear-banding and a non-Newtonian flow curve as well as viscoelasticity under oscillatory shear. Their behaviour under steady and oscillatory shear is correctly reproduced in our simulations. On cessation of shear, as the morphology returns to the diamond phase, the relaxation of the stress response follows a stretched-exponential form for low initial strain rates.
|Title:||Rheological response and dynamics of the amphiphilic diamond phase from kinetic lattice-Boltzmann simulations|
|Keywords:||complex fluids and colloidal systems, multi-scale methods, morphological control, phase transitions, self-assembly, liquid crystal rheology, LYOTROPIC LIQUID-CRYSTALS, BLOCK-COPOLYMERS, CUBIC PHASE, GYROID MESOPHASE, FLUID MIXTURES, DOMAIN GROWTH, SYSTEMS, MODEL, SHEAR, PRESSURE|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry|
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