New grafted ferrite particles/liquid crystal composite under magnetic field

•A novel composite: grafted magnetite particles/liquid crystal was obtained.•The magnetic Fréedericksz transition was studied using a laser beam.•The experimentally determined critical field found in good agreement with theory. A new colloidal composite formed by specially synthesized dimethylphenyl...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2018-04, Vol.452, p.343-348
Main Author: Manaila Maximean, D.
Format: Article
Language:English
Subjects:
Colloidal particles
Ferrites
Ferronematics
Freedericksz transition
Freedericksz transitions
Liquid crystal polymers
Liquid crystals
Magnetic fields
Magnetic moments
Magnetic nanomaterials
Nanocomposites
Nanomaterials
Nematic crystals
Optical microscopy
Particulate composites
Synthesis
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Summary:•A novel composite: grafted magnetite particles/liquid crystal was obtained.•The magnetic Fréedericksz transition was studied using a laser beam.•The experimentally determined critical field found in good agreement with theory. A new colloidal composite formed by specially synthesized dimethylphenyl ferrite particles and a nematic liquid crystal (LC) is presented. By applying a small magnetic field during polarizing optical microscopy observations, it was found that the magnetic moment of the synthesized ferrite is perpendicular to the director of the LC. The optical transmission of laser light across the ferronematic was investigated under magnetic field. The critical magnetic field corresponding to the Freedericksz transition was obtained and discussed according to the Burylov and Raikher theory.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.12.096