The Effect Of Surfaces On The Orientational Properties and Phase Transitions Peculiarities Of A Nonpolar Smectogen

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Date

2010

Authors

Yıldız, Sevtap
Zayim, Esra Ozkan
Pekcan, Önder
Özbek, Haluk

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World Scientific Publ Co Pte Ltd

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Abstract

The effect of thin films on the orientational and optical properties of nonpolar monolayer smectogen 4-butoxyphenyl-4'-decyloxybenzoate ((10) over barO (4) over bar) liquid crystal has been studied by polarizing microscopy and high-resolution photon transmission method. The uniform planar textures of (10) over barO (4) over bar on the surfaces coated with WO3 VO2 and WO3-VO2 mixture thin films have been obtained. No significant shifts in the phase transition temperatures to lower values under the influence of the surfaces have been observed. We have also presented the new experimental data on the critical behavior of the layer compression modulus B near the nematic-smectic A transition. It was observed that the data in the vicinity of the transition can be described by a power law expression after the introduction of a first-order correction-to-scaling term within the limit of experimental error. The resulting critical exponent was found to be 0.34 -/+ 0.01 which is good agreement with the previously reported values for other investigated compounds in literature.

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Keywords

Nematic phase, Smectic A phase, Surface treatments, Planar texture, Orientation, Photon transmission

Turkish CoHE Thesis Center URL

Citation

6

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N/A

Scopus Q

Q3

Source

Volume

24

Issue

22

Start Page

4305

End Page

4323