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Polymer Ultrathin Films Via Alternate Self-Assembly Adsorption of Polyelectrolyte and Azo-Dye Molecules: Photo-Induced Alignment and Lc Display Properties

Published online by Cambridge University Press:  10 February 2011

R.C. Advincula ,
A. Baba  and
F. Kaneko
R.C. Advincula
Affiliation:
University of Alabama at Birmingham, Department of Chemistry, Birmingham, AL 35294-1240
A. Baba
Affiliation:
Niigata University, Department of Electrical Engineering, Niigata, JAPAN, 950-21
F. Kaneko
Affiliation:
Niigata University, Department of Electrical Engineering, Niigata, JAPAN, 950-21
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Abstract

In this report, we describe the fabrication and photo-induced alignment of ultrathin films of small molecular azobenzene dyes and polyelectrolytes using the alternate polyelectrolyte deposition (APD) technique. The molecular self-assembly process were investigated by QCM, ellipsometry, UV-vis spectroscopy, X-ray reflectometry, and other surface sensitive spectroscopic and microscopic methods to correlate with film formation parameters. The importance of layer ordering and dye aggregation phenomena is emphasized. We then utilized polarized UV-light to induce photo-alignment of these ultrathin films and observed high anisotropies dependent on the dye, layer preparation and thickness. Fabrication of hybrid LC cells using a nematic LC reveal that in-plane homogeneous alignment is influenced by the anisotropy of the dye aggregates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 559: Symposium D – Liquid Crystals Materials and Devices , 1999 , 195
Copyright
Copyright © Materials Research Society 1999

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References

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