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 > External Field > Dynamic Control of the Smectic Membranes
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

Dynamic Control of the Smectic Membranes

Dynamic Control of the Smectic Membranes Self-assembled soft matter is often used in photonics because its characteristic length scale can be of the order of the wavelength of light. For example, a hyperswollen lamellar phase composed of bilayer membranes reflects visible light by the Bragg diffraction and acts as a photonic smectic crystal. The softness of such a structure allows us to dynamically control its photonic characteristics using an external field, as reported here. The smectic order of membranes is destabilized by doping charged colloidal particles into intermembrane water regions. However, we found that anisotropic coherent motion of particles along membranes induced by an alternating electric field enhances the degree of the photonic smectic order significantly. This demonstrates that entropic interactions can be controlled by modulating the membrane fluctuations through their dynamic coupling to an external field.

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