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Gas flow-field induced director alignment in polymer dispersed liquid crystal microdroplets deposited on a glass substratePolymer dispersed liquid crystal thin films have been deposited on glass substrates by the processes of polymerization and solvent evaporation induced phase separation. The electron and the optical polarization microscopies of the films reveal that PDLC microdroplets formed during the process of phase separation near the top surface of the film remain exposed and respond to shear stress due to air or gas flow on the surface. Optical response of the film to an air flow-induced shear stress input on the free surface has been measured. Director orientation in the droplets changes with the applied shear stress leading to time varying transmitted light intensity. Director dynamics of the droplet for an applied step shear stress has been discussed from free energy considerations. Results on the measurement of light transmission as a function of the gas flow parameter unambiguously demonstrate the potential of these systems for use as boundary layer and gas flow sensors.
Document ID
19930062354
Document Type
Reprint (Version printed in journal)
Authors
Parmar, D. S.
(Old Dominion Univ. Norfolk, VA, United States)
Singh, J. J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Liquid Crystals
Volume: 14
Issue: 2
ISSN: 0267-8292
Subject Category
Optics
Accession Number
93A46351
Funding Number(s)
CONTRACT_GRANT: NAS1-18584-111
Distribution Limits
Public
Copyright
Other

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