TANAKA LAB. Physics of Soft Condensed Matter The University of Tokyo Graduate School of Engineering Department of Applied Physics The University of Tokyo Institute of Industrial Science Department of Fundamental Engineering
Entrance > Research > Polymer, Liquid Crystal, Colloid, Membrane, Protein > Membrane System > Shear-Induced Topological Transitions in a Membrane System
Polymer, Liquid Crystal, Colloid, Membrane, ProteinLiquid, Glass, GelLight and Soft Matter
Phase Separation in a Normal Fluid MixtureViscoelastic Phase SeparationPhase Separation of Colloidal SuspensionsNumerical Simulations of Viscoelastic Phase SeparationMicro-Phase Separation in Diblock CopolymerInterplay between Wetting and Phase SeparationPhase Separation under External FieldsDynamic Control of the Smectic MembranesCritical Phenomena in Polymer SolutionsCoil-Globule Transition of a Single PolymerColloidal ‘Atom’Colloidal Gel NetworkElectrophoretic Separation of Charged ParticlesAggregation of Charged Colloidal SystemsSurface-Assisted Monodomain Formation of a Lyotropic Liquid CrystalShear-Induced Topological Transitions in a Membrane SystemSpontaneous Onion-Structure FormationSelf-Organization in Phase Separation of a Lyotropic Liquid CrystalTransparent Nematic Phase in a Liquid-Crystal-Based MicroemulsionColloidal Aggregation in a Nematic Liquid CrystalPhase Separation of a Mixture of an Isotropic Liquid and a Liquid CrystalSpontaneous Partitioning of Particles in a Membrane System

Shear-Induced Topological Transitions in a Membrane System

Shear-Induced Topological Transitions in a 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.

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