Title: Quantitative photoacoustic depth profilometry of magnetic field-induced thermal-diffusivity inhomogeneity in the liquid-crystal octylcyanobiphenyl
Authors: Mandelis, A
Schoubs, E
Paralta, Sb
Thoen, Jan #
Issue Date: Aug-1991
Publisher: Amer inst physics
Series Title: Journal of Applied Physics vol:70 issue:3 pages:1771-1777
Abstract: An observed change in the photoacoustic signal frequency response upon the application of a transverse magnetic field across octylcyanobiphenyl samples in the nematic phase at 37-degrees-C and 37.5-degrees-C is reported. The application of a recent thermal-wave theory developed for depth profiling of continuously inhomogeneous condensed phases has given quantitative profiles of thermal diffusivity decreases extending to 20-30-mu-m below the liquid crystal surface. These decaying depth profiles are qualitatively consistent with earlier photoacoustic temperature scans of liquid crystals and are a measure of the extent of bulk reorientational effects due to the magnetic field, as well as the extent of the influence of the surface as a domain reorientation inhibitor in the KG range.
ISSN: 0021-8979
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
# (joint) last author

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