Liquid crystal phase transitions in suspensions of polydisperse plate-like particles

Article

关键词: NEMATIC-ISOTROPIC TRANSITION;    HARD-SPHERES;    SMECTIC PHASE;    MONTE-CARLO;    BEHAVIOR;    CRYSTALLIZATION;    DISPERSIONS;    SYSTEMS;    RODS;   

DOI  :  10.1038/35022535

来源: SCIE

【 摘 要 】

Colloidal suspensions that form periodic self-assembling structures on sub-micrometre scales are of potential technological interest; for example, three-dimensional arrangements of spheres in colloidal crystals(1) might serve as photonic materials(2), intended to manipulate light. Colloidal particles with non-spherical shapes (such as rods and plates) are of particular interest because of their ability to form liquid crystals. Nematic liquid crystals possess orientational order; smectic and columnar liquid crystals additionally exhibit positional order (in one or two dimensions respectively). However, such positional ordering(3,4) may be inhibited in polydisperse colloidal suspensions. Here we describe a suspension of plate-like colloids that shows isotropic, nematic and columnar phases on increasing the particle concentration. We find that the columnar two-dimensional crystal persists for a polydispersity of up to 25%, with a cross-over to smectic-like ordering at very high particle concentrations. Our results imply that liquid crystalline order in synthetic mesoscopic materials may be easier to achieve than previously thought.

【 授权许可】

Free