Nematic—smectic-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>A</mml:mi></mml:math>—smectic-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi></mml:math>multicritical point

Dehoff, R.; Biggers, Rand R.; Brisbin, D.; Johnson, D.L.

doi:10.1103/physreva.25.472

Cited by 54 publications

(12 citation statements)

References 31 publications

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“…The results obtained for the mixtures 7OS5/8OS5 were the following: the N-SmA transitions show strong pretransitional heat capacity anomalies characteristic for the nematic-smectic A transition and the weakening (in terms of energetic effects) of the transitions as the tricritical point is approached. The entropy of the N-SmC transition rapidly decreases and vanishes at the polycritical point [15,16]. A similar change of transition entropy and enthalpy was observed for N-SmA transitions of several mixtures of 7OS5 and 8OS5 [15].…”

Section: Introductionsupporting

confidence: 69%

“…The entropy of the N-SmC transition rapidly decreases and vanishes at the polycritical point [15,16]. A similar change of transition entropy and enthalpy was observed for N-SmA transitions of several mixtures of 7OS5 and 8OS5 [15].…”

Section: Introductionsupporting

confidence: 69%

“…This procedure is justified because the N-SmA transition in 10OS5 is of the first order and was successfully employed for other mixtures too [34]. The N-SmA transition entropies vanish at the N-SmA-SmC point, within the experimental accuracy, as one can see in figure 7 (a; for 6OS5/10OS5, b; for 7OS5/10OS5 and c; for 7OS5/12OS5).…”

Section: Os5/12os5 Mixturementioning

confidence: 81%

“…The nematic -SmA-SmC multicritical point (NAC point) was found in binary mixtures of liquid crystals from the nOS5 homologous series: 7OS5/8OS5 (n ¼ 7 and 8) [15,16] and 7OS5/9OS5 (n ¼ 7 and 9) [17]. Phase diagrams for these systems were found to have the following features: a line of continuous SmA-SmC transitions, a line of second order N-SmA transitions, a line of first order N-SmC transitions, and a multicritical point where these three lines meet.…”

Section: Introductionmentioning

confidence: 99%

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Phase behaviour of novel liquid crystalline mixtures based on thiobenzoates†

Chruściel¹,

Wojciechowska²,

Ossowska‐Chruściel³

et al. 2007

Phase Transitions

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Five compounds from the 4-n-pentylphenyl-4 0 -n-alkoxythiobenzoates homologous series, 4-chlorophenyl-4-n-octyloxythiobenzoate and two chiral compounds (S)-(þ)-1-methylheptylbiphenyl-(4-n-pentylphenyl)thiobenzoate and (S)-(þ)-4-(4 0 -n-penthylbenzoyl-thiobenzoyloxy)benzoate 1-methylheptyl have been prepared and investigated for their mesophase behaviour in new binary and ternary mixtures. The compounds and mixtures were thermally characterized by differential scanning calorimetry, polarizing optical microscopy and transmitted light intensity. Phase diagrams were constructed for various binary mixtures and one ternary mixture. The results are discussed in terms of influence of the molecular structure of the liquid crystalline components upon thermal stability of mesophases in their mixtures, and in particular the importance of terminal substituent. The existence of the nematic N, smectic A and smectic C multicritical point, the NAC point was suggested for three thioester mixtures.

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Section: Introductionsupporting

confidence: 69%

Section: Introductionsupporting

confidence: 69%

Section: Os5/12os5 Mixturementioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Phase behaviour of novel liquid crystalline mixtures based on thiobenzoates†

Chruściel¹,

Wojciechowska²,

Ossowska‐Chruściel³

et al. 2007

Phase Transitions

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show abstract

“…80.3 + 20.3 (Johnson et al, 1975); C6 + C7 (Achard et al, 1976); C7 + C8 (Achard ef al., 1976); 7S5 + 8S5 (Johnson et al, 1977;Safinya et al, 1981Safinya et al, ,1983Witanachchi et al, 1983;DeHoff et al, 1982) 60 CB + 80 CB ; 9CB + 10 CB (Thoen eral., 1984); 8CB + lOCB (Marynissen et al, 1985); 608 + 6010 (Anisimov et al, 1988) ; 7S5 + 80 CB (Huster et al, 1987); 40.6 + 60.4 (Rananavare et al, 1987); 6012 + 6010 (Anisimov et al, 1987;1990); 608 + 6010; (Anisimov, 1988); 608 + 6010 + 6012 (Anisimov, 1988); 40.8 + 60.8 (Stine and Garland, 1989); 508 + 608 (Thoen and Parret, 1989).…”

Section: Introductionmentioning

confidence: 99%

Landau theory of the nematic-smectic a tricritical phase transition in a binary mixture of liquid crystals

Yurtseven

1995

Phase Transitions

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To cite this article: H. Yurtseven (1995) Landau theory of the nematic-smectic a tricritical phase transition in a binary mixture of liquid crystals, Phase Transitions: A Multinational Journal, 53:1, 75-86,We have developed in this study athennodynamic model for the nematic-smectic A (NA) hicritical phase transition of a binary mixture of liquid crystals in analogy with the model for quasi fluid mixtures due to Griffiths. Using the Landau theory with a symmetrical TCP, we have predicted the critical behaviours of the nematic susceptibility, order parameter and the specific heat discontinuity in the vicinity of the TCP.Our predictions for the hicritical exponents for the order parameter and the specific heat discontinuity are those predicted by the mean field theory (&1/4 and a=1/2) with a symmetrical TCP. Our exponent value of y=1/2 for the nematic susceptibility does not agree with the mean field value of y=l.Our predicted values agree with those obtained experimentally for some binary mixtures of liquid crystals. This means that the mean field model with a symmetrical TCP is capable of describing the nematic-smectic A tricritical phase transition for a symmetrical binary mixture of liquid crystals.

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Phase Transitions in Rod‐Like Liquid Crystals

Guillon¹

1998

Handbook of Liquid Crystals Set

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Nematic—smectic-A—smectic-Cmulticritical point

Cited by 54 publications

References 31 publications

Phase behaviour of novel liquid crystalline mixtures based on thiobenzoates†

Phase behaviour of novel liquid crystalline mixtures based on thiobenzoates†

Landau theory of the nematic-smectic a tricritical phase transition in a binary mixture of liquid crystals

Phase Transitions in Rod‐Like Liquid Crystals

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