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Large Photoinduced Birefringence in Azo Dye/Polyion Films Assembled by Electrostatic Sequential Adsorption
Author(s) -
Bian S.,
He J.A.,
Li L.,
Kumar J.,
Tripathy S. K.
Publication year - 2000
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/1521-4095(200008)12:16<1202::aid-adma1202>3.0.co;2-c
Subject(s) - materials science , birefringence , adsorption , chemical engineering , photochemistry , optics , organic chemistry , chemistry , physics , engineering
Large and stable photoinduced birefringence is observed in thin films of Congo red (CR, see Figure) and poly(dimethyldiallylammonium chloride) (PDAC, see Figure), fabricated by electrostatic sequential absorption. Investigations indicate that only a small contribution to the birefringence is from photoinduced alignment of the azobenzene chromophores, the larger contribution being attributed to polarization‐selective degradation.