Photoisomerization of azobenzenes and spirocompounds in nematic and in twisted nematic liquid crystals
Article Abstract:
The nematic and twisted nematic liquid crystals mixed with azobenzene (AB), spirooxazine (SO) and spiropyran (SP) are investigated by using spectroscopic methods, including birefringence and polarized transmission, to monitor the amplitude of the changes upon phototransformation as well as the dark kinetics. The results have shown SP to be an interesting photochemical probe as it has orientation photochromism and is able to adequately sense the orientation dependent polarity of this anisotropic medium.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Waveguide spectroscopic characterization of 3D anisotropies in conventionally photooriented and annealed films of liquid crystalline and amorphous azobenzene polymers
Article Abstract:
Films of azobenzene-containing polymers were photooriented in the glassy state in such a way that the azobenzene side groups were oriented preferably perpendicular to the electric field vector. The results demonstrated the dependence of the three-dimensional order after annealing and conventional photoorientation on irradiation time, temperature, initial order, interfacial interactions, and chemical structure of the polymers.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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Analysis of the kinetics of diffraction efficiency during the holographic grating recording in azobenzene functionalized polymers
Article Abstract:
Various techniques and methodologies are used to observe the efficiency of the scattering of the light during the laser-assisted holographic grating recording process in films of several azobenzene functionalized polymers. The analysis of the temporal evolution of diffraction efficiency for the same grating formation kinetics suggests that proper and adequate care should be taken during the experiment to get accurate results.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
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