MilliporeSigma

Electrically controlled topological micro cargo transportation.

Soft matter (2020-03-03)
A S Bhadwal, N J Mottram, A Saxena, I C Sage, C V Brown
ABSTRACT

We demonstrate electrically controlled linear translation and precision positioning of a colloidal particle in a soft matter device. The basis of transportation is the time dependent electric field reconfiguration and manipulation of a topological line defect between two distinct hybrid aligned nematic liquid crystal domains having opposing tilt orientations. Deliberately tuning an applied voltage relative to a low threshold value (5.7 V at 1 kHz) permits defect trapping of the colloidal particle and allows subsequent control over the particle's velocity and bidirectional linear movement over millimeter distances, without the need for externally imposed flow nor for lateral confining walls.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
4′-Heptyl-4-biphenylcarbonitrile, 98%
Sigma-Aldrich
4′-Pentyl-4-biphenylcarbonitrile, liquid crystal (nematic), 98%