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

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1343-1347
Number of pages5
JournalOptical Engineering
Volume40
Issue number7
DOIs
Publication statusPublished - Jul 2001

Keywords

  • Nematic liquid crystals
  • Photoacoustic and photothermal science and engineering
  • Thermal effusivity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    George, N. A., Vallabhan, C. P. G., Nampoori, V. P. N., George, A. K., & Radhakrishnan, P. (2001). Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals. Optical Engineering, 40(7), 1343-1347. https://doi.org/10.1117/1.1384884