Fabrication of ring assemblies of nematic colloids and their electric response

Yuta Tamura, Yasuyuki Kimura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Colloidal particles with a limited number of interactive sites are called colloidal molecules, and their assemblies have been intensively studied to reveal complex micro-structures. In this study, we examine colloidal particles in nematic liquid crystals, so-called nematic colloids, as colloidal molecules and fabricated some non-close-packed assemblies. Micrometer-sized particles with homeotropic surface anchoring of liquid crystal in a homeotropic cell interact with each other through dipolar-type anisotropic interactions arising from the elastic deformation of the nematic field around the particles. Using optical tweezers, we have built two-dimensional colloidal assemblies with low packing densities, including polygon-rings, chains of polygon-rings, and lattices composed of octagon-rings in a hierarchical way from smaller structure units. Because the nematic field is sensitive to the electric field, the response of the polygon-rings to an alternative electric field has been studied. They exhibited homogeneous reversible shrink as large as 15%-22% to their original sizes under several volts.

Original languageEnglish
Article number011903
JournalApplied Physics Letters
Volume108
Issue number1
DOIs
Publication statusPublished - Jan 4 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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