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Magnetic and Transparent Composites by Linking Liquid Crystals to Ferrite Nanoparticles through Covalent Networks
Author(s) -
Song H. M.,
Kim J. C.,
Hong J. H.,
Lee Y. B.,
Choi J.,
Lee J. I.,
Kim W. S.,
Kim J.H.,
Hur N. H.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600766
Subject(s) - materials science , nanomagnet , siloxane , covalent bond , ferrite (magnet) , composite material , fabrication , nanoparticle , polymer , liquid crystal , nanocrystal , nanotechnology , magnetic field , magnetization , optoelectronics , organic chemistry , medicine , physics , alternative medicine , pathology , chemistry , quantum mechanics
The fabrication of transparent, flexible, and optically homogeneous magnetic composites containing ferrite (Fe 3 O 4 ) nanoparticles, liquid crystals (LCs), and siloxane backbones is reported. The transparent magnets are achieved by covalently bonding LCs to the siloxane backbones and then linking them to dopamine‐functionalized ferrite nanocrystals. They exhibit simultaneous high transparency and strong magnetic properties. A remarkable feature of these films is that the surface morphology of the LC‐attached ferrite films can be tuned by an external magnetic field, demonstrating a striped surface in the direction of the field. We show that the LC‐attached film can act as an alignment layer to orient LCs, enabling the development of LC alignment surfaces on the basis of these nanomagnet–LC polymer composites.