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Abstract:
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We report the use of an open photoacoustic cell configuration
for the evaluation of thermal effusivity of liquid crystals. Initially, the
method is calibrated using water and glycerol as transparent liquid
samples, and the role of thermal conductivity of these liquids on the
photoacoustic signal amplitude is discussed. To demonstrate the application
of the present method for the evaluation of thermal effusivity of
liquid crystals, we have used certain multicomponent nematic liquid crystal
mixtures, namely BL001, BL002, BL032, and BL035. Each of these
liquid crystal mixtures contains four to nine components and are primarily
based on the cyanobiphenyl structure. The measured values of thermal
effusivity of BL001 and BL002 were found to be almost the same, but
differ from those of BL032 and BL035, which implies a difference in
composition of the latter two from the former two mixtures. |