ACTA

SANS Study of Liquid Crystal Doped with CoFe₂O₄ Nanoparticles

K. Zakutanská^a, A. Feoktystov^b, V. Lacková^a, N. Tomašovičová^a, I. Appel^{c, d}, S. Behrens^{c, d}, P. Kopčanský^a
^aInstitute of Experimental Physics, SAS, Watsonova 47, 04001 Košice, Slovakia
^bForschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Lichtenbergstr. 1, 85748 Garching, Germany
^cInstitut für Katalyseforschung und -technologie, Karlsruher Institut für Technologie (KIT), Postfach 3640, D-76021 Karlsruhe, Germany
^dAnorganisch-Chemisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany

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In the present paper, small-angle neutron scattering results from measurements performed on 4-n-pentyl-4'-cyanobiphenyl liquid crystal and magnetic spherical cobalt ferrite CoFe₂O₄ nanoparticles suspension are presented. To prevent aggregation, the nanoparticles were coated with mesogenic ligands. Samples with two nanoparticle concentrations of 0.0854 wt% and 0.0623 wt% as well as pure liquid crystal were investigated. Measurements in zero magnetic field and in magnetic field up to 2.2 T were carried out. The samples were oriented in the cells in zero magnetic field and aligned when large enough magnetic field was applied. Moreover, the results showed a presence of elongated objects in the samples.

DOI:10.12693/APhysPolA.137.663
topics: liquid crystal, magnetic nanoparticles, small-angle neutron scattering