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Issue 32, 2014
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Magnetically responsive gourd-shaped colloidal particles in cholesteric liquid crystals

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Abstract

Particle shape and medium chirality are two key features recently used to control anisotropic colloidal self-assembly and dynamics in liquid crystals. Here, we study magnetically responsive gourd-shaped colloidal particles dispersed in cholesteric liquid crystals with periodicity comparable or smaller than the particle's dimensions. Using magnetic manipulation and optical tweezers, which allow one to position colloids near the confining walls, we measured the elastic repulsive interactions of these particles with confining surfaces and found that separation-dependent particle–wall interaction force is a non-monotonic function of separation and shows oscillatory behavior. We show that gourd-shaped particles in cholesterics reside not on a single sedimentation level, but on multiple long-lived metastable levels separated by a distance comparable to cholesteric periodicity. Finally, we demonstrate three-dimensional laser tweezers assisted assembly of gourd-shaped particles taking advantage of both orientational order and twist periodicity of cholesterics, potentially allowing new forms of orientationally and positionally ordered colloidal organization in these media.

Graphical abstract: Magnetically responsive gourd-shaped colloidal particles in cholesteric liquid crystals

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Publication details

The article was received on 23 Apr 2014, accepted on 19 Jun 2014 and first published on 20 Jun 2014


Article type: Paper
DOI: 10.1039/C4SM00878B
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2014,10, 6014-6023
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    Magnetically responsive gourd-shaped colloidal particles in cholesteric liquid crystals

    B. Senyuk, M. C. M. Varney, J. A. Lopez, S. Wang, N. Wu and I. I. Smalyukh, Soft Matter, 2014, 10, 6014
    DOI: 10.1039/C4SM00878B

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