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

doi:10.1117/1.1384884

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

Physics

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	1343-1347
Number of pages	5
Journal	Optical Engineering
Volume	40
Issue number	7
DOIs	https://doi.org/10.1117/1.1384884
Publication status	Published - Jul 2001

Keywords

Nematic liquid crystals
Photoacoustic and photothermal science and engineering
Thermal effusivity

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Engineering

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10.1117/1.1384884

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title = "Open-cell photoacoustic investigation of the thermal effusivity of liquid crystals",

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.",

keywords = "Nematic liquid crystals, Photoacoustic and photothermal science and engineering, Thermal effusivity",

author = "George, {N. A.} and Vallabhan, {C. P.G.} and Nampoori, {V. P.N.} and George, {A. K.} and P. Radhakrishnan",

note = "Funding Information: Nibu A. George acknowledges the financial assistance provided by the Cochin University of Science and Technology during the course of the research.",

year = "2001",

month = jul,

doi = "10.1117/1.1384884",

language = "English",

volume = "40",

pages = "1343--1347",

journal = "Optical Engineering",

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AU - George, N. A.

AU - Vallabhan, C. P.G.

AU - Nampoori, V. P.N.

AU - George, A. K.

AU - Radhakrishnan, P.

N1 - Funding Information: Nibu A. George acknowledges the financial assistance provided by the Cochin University of Science and Technology during the course of the research.

PY - 2001/7

Y1 - 2001/7

N2 - 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.

AB - 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.

KW - Nematic liquid crystals

KW - Photoacoustic and photothermal science and engineering

KW - Thermal effusivity

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EP - 1347

JO - Optical Engineering

JF - Optical Engineering

IS - 7

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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