Nematic-Smectic-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi></mml:math>Tricritical Point in Alkylcyanobiphenyl Liquid Crystals

Thoen, Jan; Marynissen, Heleen; Dael, W. Van

doi:10.1103/physrevlett.52.204

Cited by 220 publications

(56 citation statements)

References 14 publications

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“…[43][44][45][46] The behavior seems consistent with the QB picture at least qualitatively. Detailed discussion on critical behavior is, however, beyond the scope of the present paper.…”

Section: A Phase Diagramsupporting

confidence: 78%

Experimental assessment of quasi-binary picture of thermotropics: Induced smectic A phase in 7CB–n-heptane system

Yamaoka

Taniguchi

Yasuzuka

et al. 2011

The Journal of Chemical Physics

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Quasi-binary (QB) picture of thermotropics, which regards a neat thermotropic liquid crystal as a binary system consisting of (semi)rigid core and molten alkyl chain, was assessed experimentally for the most famous (and representative) thermotropic mesogenic series nCB. By adding n-heptane as solvent, the smectic A phase was induced in 7CB-n-heptane system. Small angle x-ray diffraction showed that the QB picture holds not only in the phase behavior but also in the structure. It is suggested that the melting of 8CB and 9CB to isotropic liquid via smectic and nematic liquid crystals can be understood as a thermotropic-lyotropic crossover.

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“…[43][44][45][46] The behavior seems consistent with the QB picture at least qualitatively. Detailed discussion on critical behavior is, however, beyond the scope of the present paper.…”

Section: A Phase Diagramsupporting

confidence: 78%

Experimental assessment of quasi-binary picture of thermotropics: Induced smectic A phase in 7CB–n-heptane system

Yamaoka

Taniguchi

Yasuzuka

et al. 2011

The Journal of Chemical Physics

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“…The core order parameter was plotted versus temperatature to determine the change (AS) at the phase transition. Because the core order parameter can be [4,5,7,. The present results indicate that the injected smectic A phase behaves normally like an ordinary smectic A phase, which is not surprising.…”

Section: Resultsmentioning

confidence: 48%

“…Because pure 9CB exhibits a tirst order phase transition and l0CB docs not have a nematic phase, it is reasonable to expect that any mixture of these two compounds would also undergo first order phase transitions. Because of the discrepancy between the present results and the previous ones [4,5], we proceeded to examine whether there might be tricritical behaviour for 8CB/9CB mixtures. This is because 8CB has a nematic range (33.540-5"C, data from the manufacturer, E. Merck) much wider than that of 9CB (48.049.5"C), and its order parameter is continuous at the SA-N phase transition [23].…”

Section: Resultsmentioning

confidence: 92%

Tricritical points of smectic A to nematic phase transitions for binary liquid crystal mixtures containing cyanobiphenyls

Cross

Fung

1995

Liquid Crystals

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The tricritical point of the smectic A (SA) to nematic (N) phase transition in liquid crystals, at which the nature of the phase transition changes from first order to second order, is related to the change in the order parameter during the phase transition. In this study, I3C NMR was used to determine the order parameters of four binary liquid crystal systems as a function of temperature and composition in order to investigate the tricritical behaviour of their SA-N transition. The first system was mixture of 4-n-pentyl-4'-cyanobiphenyl (5CB) and 4-npentylphenyl 4'-n-pentyloxybenzoate (S05), which have an injected smectic A phase. The tricritical point of this system has a McMillan ratio of 0-949 ? 0.008. The three other systems were binary mixtures of 4-n-alkyl-4'-cyanobiphenyls (nCB). At the tricritical point, theMcMillan ratio is 0.986 -t 0.007 for the 5CB/IOCB mixtures, and 0.985 2 0.008 for the 8CB/9CB mixtures, but a tricritical point was not observed for the 9CB/lOCB mixtures. The results are compared with those of previous investigations.

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“…Thus, for T NA /T IN ≈ 0.99 a TCP is suggested. The tricritical behavior of the N-SmA phase transition has been observed by changing the alkyl end chains, 2 varying the concentration in binary mixtures, [5][6][7][8][23][24][25][26] increasing the pressure, 9 and increasing the electric field. 19 As for a) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 98%

Tricritical behavior of the nematic to smectic-A phase transition in the binary mixture of liquid crystal

Mukherjee

Tamarit

2013

The Journal of Chemical Physics

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We propose a phenomenological model to describe the tricritical behavior of the nematic to smectic-A (N-SmA) phase transition in liquid crystal mixture. To describe the mesophase transitions in binary mixture, nematic and smectic order parameters have been coupled with the concentration. We show that a tricritical point on the N-SmA phase transition line can be achieved under certain conditions. The predictive capability of the present model for determining the tricritical point of a binary mixture displaying the N-SmA transition has been demonstrated by testing with reported phase diagrams sharing both phases.

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Nematic-Smectic-ATricritical Point in Alkylcyanobiphenyl Liquid Crystals

Cited by 220 publications

References 14 publications

Experimental assessment of quasi-binary picture of thermotropics: Induced smectic A phase in 7CB–n-heptane system

Experimental assessment of quasi-binary picture of thermotropics: Induced smectic A phase in 7CB–n-heptane system

Tricritical points of smectic A to nematic phase transitions for binary liquid crystal mixtures containing cyanobiphenyls

Tricritical behavior of the nematic to smectic-A phase transition in the binary mixture of liquid crystal

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