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Issue 20, 2009
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Janus nematic colloids

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Abstract

We study the behavior of Janus colloidal particles in the nematic liquid crystal 5CB using polarizing optical microscopy and Landau-de Gennes (LdG) modeling. Different equilibrium orientations of Janus particles and different director field configurations around them are observed, depending on the preparation technique of homeotropic (DMOAP) and planar (Au) hemispheres. Using laser tweezers we measure the interactions between different orientations of Janus nematic colloids, showing a boojum type of interaction in the case of DMOAP/Au capped colloids and dipolar-like attraction for Au/DMOAP capped colloids. We observe a novel type of nematic colloidal particle, called a boojum-ring, characteristic of Au/DMOAP Janus nematic colloids, that is also predicted within the LdG theory for patterned colloidal particles with competing homeotropic and planar surfaces.

Graphical abstract: Janus nematic colloids

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Article information


Submitted
20 Mar 2009
Accepted
03 Jun 2009
First published
10 Jul 2009

Soft Matter, 2009,5, 3905-3912
Article type
Paper

Janus nematic colloids

M. Conradi, M. Ravnik, M. Bele, M. Zorko, S. Žumer and I. Muševič, Soft Matter, 2009, 5, 3905
DOI: 10.1039/B905631A

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