Electric-field and magnetic-field alignment of liquid-crystalline clay suspensions and clay/polymer composites

Nematic and isotropic aqueous suspensions of beidellite clay sheets have been submitted to magnetic and a. c. electric fields. The nematic suspensions have positive anisotropy of magnetic susceptibility and negative anisotropy of electric susceptibility because the clay sheets orient their normals p...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011-10, Vol.18 (6), p.062005-6
Main Authors: Paineau, E, Dozov, I, Antonova, K, Davidson, P, Impéror, M, Meneau, F, Bihannic, I, Baravian, C, Philippe, A M, Levitz, P, Michot, L J
Format: Article
Language:English
Subjects:
Acrylamide
Alignment
Anisotropy
Birefringence
Clay
Clay (material)
Electric fields
Gels
Magnetic permeability
Nematic
Photopolymerization
Polymer matrix composites
Polymers
Sheets
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Summary:Nematic and isotropic aqueous suspensions of beidellite clay sheets have been submitted to magnetic and a. c. electric fields. The nematic suspensions have positive anisotropy of magnetic susceptibility and negative anisotropy of electric susceptibility because the clay sheets orient their normals parallel to the magnetic field but perpendicular to the electric field. Moreover, the isotropic phase shows a large electric-field-induced birefringence. By dissolving acrylamide monomers in the clay suspensions and photopolymerization, clay/polymer composite gels could be elaborated. Aligned and patterned composites could be produced by application of an electric field during polymerization.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/6/062005