Shear-induced discontinuous and continuous topological transitions in a hyperswollen membrane system.
Here we demonstrate that both discontinuous and continuous transition between the sponge and lamellar phase can be induced by steady shear flow for a hyperswollen membrane system. The discontinuous nature of the transition is revealed by a distinct hysteresis in the rheological behavior between shear-rate increasing and decreasing measurements at a constant temperature. This discontinuity becomes weaker with an increase in the shear rate and temperature, and the transition eventually becomes a continuous one without any hysteresis. We also found another shear-induced transition in a one-phase lamellar region. The dynamic phase diagram in a nonequilibrium steady state under shear is constructed for the sponge-lamellar transition as well as another transition in a stable lamellar phase. Possible physical mechanisms for these shear-induced transitions are discussed.
Tanaka
Hajime
H
Institute of Industrial Science, University of Tokyo, Meguro-ku, Tokyo 153-8505, Japan. tanaka@iis.u-tokyo.ac.jp
Isobe
Mamoru
M
Miyazawa
Hideyuki
H
D003198:Computer Simulation; D004548:Elasticity; D050866:Liquid Crystals / Q000737:chemistry*; D008560:Membrane Fluidity; D008567:Membranes, Artificial; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D009997:Osmotic Pressure; D044367:Phase Transition; D033081:Shear Strength; D013314:Stress, Mechanical
D008567:Membranes, Artificial