Title: Optical and dielectric characteristics of photochromic hybrid sol-gel materials
Authors: Serwadczak, M ×
W├╝bbenhorst, Michael
Kucharski, S #
Issue Date: Oct-2006
Publisher: Springer
Series Title: Journal of sol-gel science and technology vol:40 issue:1 pages:39-44
Abstract: Photochromic silica based organic-inorganic hybrid materials containing covalently linked cyanoazobenzene chromophores were investigated by optical and dielectric spectroscopy. These materials, obtained via sol-gel process, were deposited onto glass substrates by spin coating technique to achieve thin transparent films. To investigate photoinduced alignment, the UV-Vis absorption spectra of the sol-gel films were recorded under illumination with linearly polarized blue light. Dielectric relaxation spectroscopy revealed a variety of relaxation processes: the alpha-process related to the dynamic glass transition temperature located around 150 degrees C, and an Arrhenius-type beta-relaxation (activation energy 58-60 kJ/mol) that was assigned to orientational fluctuations involving the azobenzene group. The correspondence between dielectric and photochemical behavior was discussed.
ISSN: 0928-0707
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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