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Ordering of ferromagnetic nanoparticles in nematic liquid crystals

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Abstract

Dispersions of magnetic nanoparticles in a nematic liquid crystal were investigated as magnetic fields were applied in three different boundary condition geometries: (i) planar substrates and Bn, (ii) planar substrates and Bn, and (iii) homeotropic substrates and Bn. Particle chaining is observed when a magnetic field is applied, with a periodicity perpendicular to the chains. Furthermore, linear chains are observed for the magnetic field applied perpendicular to the director, while zigzag chains are formed when the magnetic field direction is parallel to the director field. This is attributed to a change from a dipolar defect configuration around dispersed nanoparticles, to a quadrupolar one, i.e. the change from satellite to Saturn-ring defects. This effect is largely independent of the sample thickness. The dynamic development of the chain length, as well as their two-dimensional order parameter was studied in all cases. Chain lengths increased rapidly until saturation at approximately l = 30 μm after a time of about t = 10 s. Similarly, the chain order parameters increased until saturation between S = 0.8–0.9, independent of sample geometry.

Graphical abstract: Ordering of ferromagnetic nanoparticles in nematic liquid crystals

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Publication details

The article was received on 24 May 2017, accepted on 14 Jun 2017 and first published on 15 Jun 2017


Article type: Paper
DOI: 10.1039/C7SM01029J
Citation: Soft Matter, 2017, Advance Article
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    Ordering of ferromagnetic nanoparticles in nematic liquid crystals

    I. Dierking, M. Heberle, M. A. Osipov and F. Giesselmann, Soft Matter, 2017, Advance Article , DOI: 10.1039/C7SM01029J

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