A phase diagram of smectogen-non-smectogen binary mixture: A photon transmission study

S. Yildiz; I. E. Serhatli; Ö Pekcan; A. N. Berker; H. Özbek

doi:10.1142/S0217979202013122

A phase diagram of smectogen-non-smectogen binary mixture: A photon transmission study

S. Yildiz, I. E. Serhatli, Ö Pekcan, A. N. Berker, H. Özbek^*

^*Corresponding author for this work

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

6 Citations (Scopus)

Abstract

The ultraviolet/visible photon transmission technique was applied to study the phase diagram of a mixture of 4-ethoxy-4′-(6-vinyloxyhexyloxyl) azobenzene (VE), a smectogen, and 4-hexoxy-3′-methyl-4′-(6-acryloyloxyhexyloxy) azobenzene (AH), which by itself exhibits no liquid crystalline behavior. It has been found that the N-Sm-A phase line terminates at either a tricritical point at about X_VE = 0.9, where X_VE is the weight percentage of VE in the binary mixture, or at least at a tricritical region 0.9 < X_VE < 1 within the experimental resolution. For X_VE = 1 the nematic phase region is not large enough to drive the transition second-order. It is found that the value of the critical exponent β for X_VE = 0.9 is consistent with the tricritical value.

Original language	English
Pages (from-to)	3959-3970
Number of pages	12
Journal	International Journal of Modern Physics B
Volume	16
Issue number	26
DOIs	https://doi.org/10.1142/S0217979202013122
Publication status	Published - 20 Oct 2002

Funding

This work was supported by the Scienti c and Techonological Research Council of Turkey (TÜBI_TAK) under Grant No: TBAG-1951 (100T074), and the Research Fund of Istanbul Technical University, Grant No: 1426 and 1538. The authors wish to thank Prof. G. Galli (University of Pisa, Chemistry Department) for providing the liquid crystalline monomer.

Funders	Funder number
Scienti c and Techonological Research Council of Turkey	TBAG-1951, 100T074
Istanbul Teknik Üniversitesi	1426, 1538

Keywords

Binary mixture
Critical exponents
Nematic order
Photon transmission technique
Smectic order
Tricritical point

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title = "A phase diagram of smectogen-non-smectogen binary mixture: A photon transmission study",

abstract = "The ultraviolet/visible photon transmission technique was applied to study the phase diagram of a mixture of 4-ethoxy-4′-(6-vinyloxyhexyloxyl) azobenzene (VE), a smectogen, and 4-hexoxy-3′-methyl-4′-(6-acryloyloxyhexyloxy) azobenzene (AH), which by itself exhibits no liquid crystalline behavior. It has been found that the N-Sm-A phase line terminates at either a tricritical point at about XVE = 0.9, where XVE is the weight percentage of VE in the binary mixture, or at least at a tricritical region 0.9 < XVE < 1 within the experimental resolution. For XVE = 1 the nematic phase region is not large enough to drive the transition second-order. It is found that the value of the critical exponent β for XVE = 0.9 is consistent with the tricritical value.",

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AU - Berker, A. N.

AU - Özbek, H.

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N2 - The ultraviolet/visible photon transmission technique was applied to study the phase diagram of a mixture of 4-ethoxy-4′-(6-vinyloxyhexyloxyl) azobenzene (VE), a smectogen, and 4-hexoxy-3′-methyl-4′-(6-acryloyloxyhexyloxy) azobenzene (AH), which by itself exhibits no liquid crystalline behavior. It has been found that the N-Sm-A phase line terminates at either a tricritical point at about XVE = 0.9, where XVE is the weight percentage of VE in the binary mixture, or at least at a tricritical region 0.9 < XVE < 1 within the experimental resolution. For XVE = 1 the nematic phase region is not large enough to drive the transition second-order. It is found that the value of the critical exponent β for XVE = 0.9 is consistent with the tricritical value.

AB - The ultraviolet/visible photon transmission technique was applied to study the phase diagram of a mixture of 4-ethoxy-4′-(6-vinyloxyhexyloxyl) azobenzene (VE), a smectogen, and 4-hexoxy-3′-methyl-4′-(6-acryloyloxyhexyloxy) azobenzene (AH), which by itself exhibits no liquid crystalline behavior. It has been found that the N-Sm-A phase line terminates at either a tricritical point at about XVE = 0.9, where XVE is the weight percentage of VE in the binary mixture, or at least at a tricritical region 0.9 < XVE < 1 within the experimental resolution. For XVE = 1 the nematic phase region is not large enough to drive the transition second-order. It is found that the value of the critical exponent β for XVE = 0.9 is consistent with the tricritical value.

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A phase diagram of smectogen-non-smectogen binary mixture: A photon transmission study

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