Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals

Nibu A. George; C. P. G. Vallabhan; V. P. N. Nampoori; A. K. George; Periasamy Radhakrishnan

doi:10.1117/1.1384884

1 July 2001 Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals

Nibu A. George, C. P. G. Vallabhan, V. P. N. Nampoori, A. K. George, Periasamy Radhakrishnan

Optical Engineering, Vol. 40, Issue 7, (July 2001). https://doi.org/10.1117/1.1384884

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.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Nibu A. George, C. P. G. Vallabhan, V. P. N. Nampoori, A. K. George, and Periasamy Radhakrishnan "Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals," Optical Engineering 40(7), (1 July 2001). https://doi.org/10.1117/1.1384884

Published: 1 July 2001

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