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Simple Molecular Model for the Smectic A Phase of Liquid Crystals
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In this article, the Maier-Saupe model with an orientational order parameter is extended to the smectic $A$ phase by introducing a new order parameter, the amplitude of a density wave in the direction of the nematic preferred axis.Abstract:
The Maier-Saupe model of the nematic phase with an orientational order parameter is extended to the smectic $A$ phase by introducing a new order parameter, the amplitude of a density wave in the direction of the nematic preferred axis. Self-consistent equations for the two order parameters are derived from an anisotropic model interaction and are solved numerically. We calculate the order parameters, the entropy, and the specific heat as a function of temperature for several values of dimensionless interaction strength $\ensuremath{\alpha}$ for the smectic $A$ phase. The transition temperatures plotted versus $\ensuremath{\alpha}$ provide a theoretical phase diagram which resembles experimental plots of transition temperature versus alkyl chain length for homologous series of compounds. The model qualitatively reproduces chemical trends in transition entropies. Experiments are suggested to measure the order parameters in the smectic $A$ phase.read more
Citations
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Physics of liquid crystals
TL;DR: In this article, the physical properties of nematic, cholesteric, and smectic liquid crystals are discussed and a wide variety of phenomena in liquid crystals, including elastic distortions, disclinations, flow properties, fluctuations, light scattering, wave propagation, nuclear magnetic resonance, effects of magnetic and electric fields, electrohydrodynamics, and optical properties.
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Surface effects and anchoring in liquid crystals
TL;DR: In this paper, a review focusing on nematic liquid crystals is presented, where three main kinds of effects can be distinguished: the perturbation of the liquid crystalline structure close to the surface, the bulk liquid crystal structure is recovered with an orientation which is fixed by the surface and critical adsorption or wetting can occur at surfaces.
Journal ArticleDOI
Chain ordering in liquid crystals. I. Even‐odd effect
TL;DR: In this paper, the authors used a self-consistent molecular field approximation to calculate the nematic orientational ordering of a system where molecules consist of rigid parts and chains, and provided an explanation for the even-odd effect in isotropic-nematic transition temperatures.
Journal ArticleDOI
Gas-phase spectroscopy of biomolecular building blocks.
TL;DR: Recent results help elucidate structure and hydrogen-bonded interactions, as well as showcase a successful interplay between theory and experiment in gas-phase spectroscopy.
References
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Journal ArticleDOI
Eine einfache molekular-statistische Theorie der nematischen kristallinflüssigen Phase. Teil II
Wilhelm Maier,Alfred Saupe +1 more
TL;DR: In this paper, the authors describe a mittlere Innere Feld einer nematischen Molekülanordnung abgeleitet, and gezeigt, daß this Innere Field in einem gewissen Temperaturbereich einen nematicalhen Ordnungszustand bewirken muß and daß dieser ordnung sustand was with einer bestimmten Temperatur diskontinuierlich und unter Energieaufnahme in die isot
Journal ArticleDOI
Eine einfache molekulare Theorie des nematischen kristallinflüssigen Zustandes
W. Maier,Alfred Saupe +1 more
Journal ArticleDOI
Theory of Translational and Orientational Melting with Application of Liquid Crystals. I
TL;DR: A theory of translational and orientational melting with application to liquid crystals is presented in this article in a manner analogous to that of Kirkwood and Monroe by introducing both translational or orientational order parameters.
Journal ArticleDOI
On the theory of translational and orientational melting with application to liquid crystals
TL;DR: The theory of translational and orientational melting with application to liquid crystals is presented in this article in a manner analogous to that of Kirkwood and Monroe, and the theory is applied to liquid crystal crystallography.
Journal ArticleDOI
Two Liquid Crystal Phases with Nematic Morphology in Laterally Substituted Phenylenediamine Derivatives
TL;DR: In this article, an additional lower temperature liquid crystalline phase is observed with chloro-substituted compounds for n-alkoxy chain lengths of C8 and longer and with the methyl substituted compounds for chain length of C10 and longer.
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