The effect of surfaces on the orientational properties and phase transitions peculiarities of a nonpolar smectogen

Sevtap Yildiz; Esra Özkan Zayim; Önder Pekcan; Haluk Özbek

doi:10.1142/S0217979210055603

The effect of surfaces on the orientational properties and phase transitions peculiarities of a nonpolar smectogen

Sevtap Yildiz, Esra Özkan Zayim, Önder Pekcan, Haluk Özbek^*

^*Corresponding author for this work

Department of Physics Engineering

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

6 Citations (Scopus)

Abstract

The effect of thin films on the orientational and optical properties of nonpolar monolayer smectogen 4-butoxyphenyl-4-decyloxybenzoate 10.O.4 liquid crystal has been studied by polarizing microscopy and high-resolution photon transmission method. The uniform planar textures of 10.O.4 on the surfaces coated with WO₃, VO₂, and WO₃VO₂ 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 nematicsmectic 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.

Original language	English
Pages (from-to)	4305-4323
Number of pages	19
Journal	International Journal of Modern Physics B
Volume	24
Issue number	22
DOIs	https://doi.org/10.1142/S0217979210055603
Publication status	Published - 10 Sept 2010

Funding

This work was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No: TBAG-HD/113 (106T002) and the Research Fund of Istanbul Technical University under Grant Nos: 31212 and 31723. The authors are grateful to Prof. Dr. Fatma Tepehan for use of the thin film laboratory at Istanbul Technical University. They also thank Prof. Dr. C. Van Haesendonck and Dr. A. Volodin at the Laboratorium voor Vaste-Stoffysica en Magnetisme, Departement Natuurkunde en Sterrenkunde, K.U.Leuven, Belgium for the use of AFM. The authors wish to thank Prof. Arif Nesrullajev for many useful discussions and invaluable suggestions. Önder Pekcan thanks The Academy of Sciences of Turkey (TÜBA) for partial support as well.

Funders	Funder number
TUBITAK	106T002, TBAG-HD/113
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu
Istanbul Teknik Üniversitesi	31212, 31723

Keywords

Nematic phase
orientation
photon transmission
planar texture
smectic A phase
surface treatments

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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.O.4 liquid crystal has been studied by polarizing microscopy and high-resolution photon transmission method. The uniform planar textures of 10.O.4 on the surfaces coated with WO3, VO2, and WO3VO2 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 nematicsmectic 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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AU - Özbek, Haluk

PY - 2010/9/10

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N2 - The effect of thin films on the orientational and optical properties of nonpolar monolayer smectogen 4-butoxyphenyl-4-decyloxybenzoate 10.O.4 liquid crystal has been studied by polarizing microscopy and high-resolution photon transmission method. The uniform planar textures of 10.O.4 on the surfaces coated with WO3, VO2, and WO3VO2 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 nematicsmectic 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.

AB - The effect of thin films on the orientational and optical properties of nonpolar monolayer smectogen 4-butoxyphenyl-4-decyloxybenzoate 10.O.4 liquid crystal has been studied by polarizing microscopy and high-resolution photon transmission method. The uniform planar textures of 10.O.4 on the surfaces coated with WO3, VO2, and WO3VO2 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 nematicsmectic 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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The effect of surfaces on the orientational properties and phase transitions peculiarities of a nonpolar smectogen

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