SANS study of magnetic nanoparticles ordering in liquid crystal host
Liquid crystals (LCs) belong to a class of soft condensed matter- characterized by the combination of fluidity of ordinary liquids with the direction dependent electric and optical properties of crystalline solids. The majority of LCs are formed by rod-like organic molecules, where their ordering is a function of temperature. In the nematic phase the molecules have no positional order, but they tend to point in the same direction (along the director n). Due to the anisotropy of the dielectric permittivity and of the diamagnetic susceptibility it is possible to control the orientational order of LCs. A promising method how to modify the properties of LCs is to doped them with magnetic nanoparticles (MNs) in low volume concentrations. Stable colloidal suspensions of fine MNs in nematic LCs called ferronematics (FNs) can be easily aligned by a magnetic field and these therefore act as nanomagnets. The most essential feature of FNs is a coupling between the MNs (their magnetic moment m) and the LC matrix (the director n). mentioned existing coupling ensures that the effect of the magnetic field will be transferred into the nematic host.
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LACKOVA (GDOVINOVA) Veronika; HONECKER Dirk; KOPCANSKY Peter and TOMASOVICOVA Natalia. (2018). SANS study of magnetic nanoparticles ordering in liquid crystal host. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1883
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