Reference : Order-disorder molecular model of the smectic-A-smectic-C phase transition in materia...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/10993/20541
Order-disorder molecular model of the smectic-A-smectic-C phase transition in materials with conventional and anomalously weak layer contraction
English
Gorkunov, M. V. [> >]
Osipov, M. A. [> >]
Lagerwall, Jan mailto [Universität Stuttgart]
Giesselmann, F. [> >]
2007
Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics
American Physical Society
76
5
051706
Yes (verified by ORBilu)
International
1539-3755
1550-2376
College Park
MD
[en] GAY-BERNE MODEL; LIQUID-CRYSTALS; FIELD THEORY; THICKNESS; TILT
[en] We develop a molecular-statistical theory of the smectic-A-smectic-C transition which is described as a transition of the order-disorder type. The theory is based on a general expansion of the effective interaction potential and employs a complete set of orientational order parameters. All the order parameters of the smectic-C phase including the tilt angle are calculated numerically as functions of temperature for a number of systems which correspond to different transition scenario. The effective interaction potential and the parameters of the transition are also calculated for specific molecular models based on electrostatic and induction interaction between molecular dipoles. The theory successfully reproduces the main properties of both conventional and so-called ``de Vries-type'' smectic liquid crystals, clarifies the origin of the anomalously weak layer contraction and describes the tricritical behavior at the smectic-A-smectic-C transition. The ``de Vries behavior,'' i.e., anomalously weak layer contraction is also obtained for a particular molecular model based on interaction between longitudinal molecular dipoles. A simple phenomenological model is presented enabling one to obtain explicit expressions for the layer spacing and the tilt angle which are used to fit the experimental data for a number of materials.
Researchers
http://hdl.handle.net/10993/20541
10.1103/PhysRevE.76.051706
Univ Strathclyde, Dept Math, Glasgow G1 1XH, Lanark, Scotland.   Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia.   Univ Stuttgart, Inst Phys Chem, D-70569 Stuttgart, Germany. Gorkunov, MV, Univ Strathclyde, Dept Math, Glasgow G1 1XH, Lanark,   Scotland.

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