Thermal, X-Ray and Birefringence Measurements in Hexatic Liquid Crystal Phases

Boschmans, M.; Guermai, K. El; Gors, C.

doi:10.1080/00268949108046048

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…All these experiments showed the first-order character of the phase transition between the SmC mesophase and isotropic liquid. Our results correspond to the results presented in [48][49][50][51] and show that the phase transition between the SmC mesophase and isotropic liquid in the SA1 and SA2 compounds is clearly a first-order transition.…”

Section: Resultssupporting

confidence: 93%

Thermotropic, Thermo-morphologic, and Thermo-optical Properties of New Smectogenic Calamitic Compounds Containing Imine Linking Groups

2011

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The synthesis and investigations of the mesomorphic, thermotropic, thermo-morphologic, and thermo-optical properties of two new salicylaldimine compounds, synthesized by our group, are reported in this work. Temperature transformations of specific textures of the smectic C mesophase, taking place in these compounds, and thermo-morphologic and thermotropic properties of the biphasic regions for direct and reverse phase transitions have been investigated. Temperature hysteresis and enlargement of the biphasic regions have been found. The character of texture transformations and temperature behavior of the optical birefringence indicate to the first order a smectic C-isotropic liquid-phase transition in these salicylaldimine compounds.

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Section: Resultssupporting

confidence: 93%

Thermotropic, Thermo-morphologic, and Thermo-optical Properties of New Smectogenic Calamitic Compounds Containing Imine Linking Groups

2011

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“…The phase transitions between SmC and the isotropic liquid are characterized by the equality of the two free energies and, accordingly, by the availability of two T Ã and T ÃÃ temperature limits and the existence of thermic hysteresis. Thus, our results are in good agreement with theoretical research [35] and experimental studies [36,37] associated with SmC-I phase transitions.…”

Section: Imine Compoundssupporting

confidence: 94%

New imine compounds and their copper complexes: synthesis, characterization and comparative investigations of morphologic, mesomorphic, thermotropic, thermo-optical and thermodynamical properties

2007

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Investigations of the morphologic, mesomorphic, thermotropic, thermo-optical and thermodynamical properties of new imine compounds and their copper complexes, synthesized by our group, have been carried out. Temperature transformations of typical textures for mesophases, taking place in imine compounds and copper complexes, and the peculiarities of the biphasic regions at the direct and reverse mesophase-isotropic liquid and isotropic liquid-mesophase phase transitions have been investigated.

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“…In this paper our interest is the study of CI transition. There are relatively few experimental papers [1][2][3][4] on the CI transition. The pretransitional behavior of terephthalylidene-bis-p-ntetradecylaniline (TB14A) and terephthalylidene-bis-p-hexadecylaniline (TB16A) exhibits a direct CI transition 4 and the pretransitional effects are weaker at the CI transition than the AI and NI transitions.…”

Section: Introductionmentioning

confidence: 99%

Landau model of the smectic C–isotropic phase transition

Mukherjee

Pleiner

Brand

2002

The Journal of Chemical Physics

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We propose a Landau model to describe the smectic C-isotropic phase transition. A general Landau theory for the coupled orientational and translational order parameters and including the tilt angle is developed. The conditions for the smectic C-isotropic phase transition and the stability conditions of the smectic C phase are calculated. On the basis of this model it is argued that the smectic C-isotropic phase transition is always first order. We present a detailed analysis of the question under which conditions a direct smectic C-isotropic phase transition prevails in comparison to smectic A-isotropic and nematic-isotropic transitions. The theoretical results are found to be in qualitative agreement with all published experimental results.

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Thermal, X-Ray and Birefringence Measurements in Hexatic Liquid Crystal Phases

Abstract: A number of experimental data on hexatic liquid crystal phases, namely the smectic I and F phases of various members of the TBnA family, are presented. They allow a better understanding of the respective structures and information of the smectic I and F phases.

Cited by 14 publications

References 2 publications

Thermotropic, Thermo-morphologic, and Thermo-optical Properties of New Smectogenic Calamitic Compounds Containing Imine Linking Groups

Thermotropic, Thermo-morphologic, and Thermo-optical Properties of New Smectogenic Calamitic Compounds Containing Imine Linking Groups

New imine compounds and their copper complexes: synthesis, characterization and comparative investigations of morphologic, mesomorphic, thermotropic, thermo-optical and thermodynamical properties

Landau model of the smectic C–isotropic phase transition

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