TITLE

Thermodynamics of the photoferroelectric effect in smectic-C[sup *] liquid crystals

AUTHOR(S)
Langhoff, Arne; Giesselmann, Frank
PUB. DATE
August 2002
SOURCE
Journal of Chemical Physics;8/1/2002, Vol. 117 Issue 5, p2232
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A general thermodynamic description of the photoferroelectric effect, where the spontaneous polarization of a ferroelectric material is changed by interaction with light, is proposed. This description leads to a distinction between primary and secondary photoferroelectricity. At a certain reduced temperature, the primary photoferroelectric effect originates from the light-induced change in the polar ferroelectric order, whereas the secondary photoferroelectric effect is a purely thermodynamic consequence of the light-induced change in the ferroelectric transition temperature T[sub c]. Using simple approximations, the general theory was applied to photoferroelectric Sm-C[sup *] liquid crystals where the photoresponse is induced by the Z,E photoisomerization of azobenzene dopant molecules. The results agree with experimental data obtained for a photoferroelectric Sm-C[sup *] mixture containing 5 mol % of the photoisomerizable dopant 4,4'-bis-[(2-methyl)butyloxy]azobenzene dissolved in the commercial ferroelectric Sm-C[sup *] host phase abbreviated FLC 6430.
ACCESSION #
6985596

 

Related Articles

  • Nematicons in chiral nematic liquid crystals. Laudyn, Urszula A.; Kwasny, Michal; Karpierz, Miroslaw A. // Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG 

    We report on the experimental studies of the existence of spatial solitons called nematicons in chiral nematic liquid crystal cells. The low absorption allows us to observe soliton propagation at a distance of over a few millimeters in range. The results of our experiment also show that it is...

  • Cahn–Hoffman capillarity vector thermodynamics for curved liquid crystal interfaces with applications to fiber instabilities. Cheong, Ae-Gyeong; Rey, Alejandro D. // Journal of Chemical Physics;9/8/2002, Vol. 117 Issue 10, p5062 

    The Cahn-Hoffman capillarity vector thermodynamics for curved anisotropic interfaces is adapted to soft liquid crystalline interfaces. The formalism is used to derive Herring's capillary pressure equation for anisotropic surfaces, where the role of anchoring energy of liquid crystals is made...

  • Effect of elongational flow on the orientational order phase transitions and viscosity of hard rod fluids. Wang, Shi-Qing; Gelbart, William M. // Journal of Chemical Physics;1/1/1989, Vol. 90 Issue 1, p597 

    We consider the generalized Smoluchowski equation for the orientational distribution of interacting hard rod-like particles. Using the Onsager theory of excluded volume in these systems, we solve for steady-state solutions to this equation in the special case of elongational flow. Accordingly,...

  • Temperature Pitch Variations in Planar Cholesteric Layers: The Role of Fluctuations and Surface Anchoring. Belyakov, V. A.; Oswald, P.; Kats, E. I. // Journal of Experimental & Theoretical Physics;May2003, Vol. 96 Issue 5, p915 

    The influence of thermodynamic fluctuations on temperature pitch variations in planar cholesteric samples with a finite surface anchoring energy is theoretically investigated in the framework of the continuum theory of liquid crystals. It is shown that taking fluctuations into account allows...

  • Experimental studies of the transient fluctuation theorem using liquid crystals. Datta, Soma; Roy, Arun // Pramana: Journal of Physics;May2009, Vol. 72 Issue 5, p797 

    In a thermodynamical process, the dissipation or production of entropy can only be positive or zero, according to the second law of thermodynamics. However, the laws of thermodynamics are applicable to large systems in the thermodynamic limit. Recently a fluctuation theorem, known as the...

  • Growth and structure of nematic spherulites under shallow thermal quenches. Wincure, Benjamin; Rey, Alejandro // Continuum Mechanics & Thermodynamics;Jun2007, Vol. 19 Issue 1/2, p37 

    The growth kinetics, shape, interfacial and internal orientation texture of a submicron nematic spherulite arising during the isotropic-to-nematic liquid crystal phase transformation under shallow thermal quenches is analyzed using theory, scaling, and numerical simulations based on the Landau...

  • Threshold orientation transition in nematic liquid crystals under ultrasonic action. Kapustina, O. // Acoustical Physics;Jul2006, Vol. 52 Issue 4, p413 

    The adequacy of the new theoretical model based on the ideas of nonequilibrium thermodynamics and nonlinear hydrodynamics of liquid crystals for describing the mechanism of threshold reorientation of molecules in a homeotropically oriented layer of a nematic liquid crystal under the effect of a...

  • Polar nano-rods under shear: From equilibrium to chaos. Grandner, S.; Heidenreich, S.; Hess, S.; Klapp, S. H. L. // European Physical Journal E -- Soft Matter;Dec2007, Vol. 24 Issue 4, p353 

    The orientational dynamics of rod-like particles with permanent (electric or magnetic) dipole moments in a plane Couette shear flow is investigated using mesoscopic relaxation equations combined with a generalized Landau free energy. The free energy contribution due to the coupling between...

  • Orientational order of near D3h solutes in nematic liquid crystals. Danilović, Zorana; Burnell, E. Elliott // Journal of Chemical Physics;4/21/2009, Vol. 130 Issue 15, p154506 

    Solutes that are similar in size, have a shape that is close to D3h symmetry but contain dissimilar substituent groups (methyl versus chloro, contributing different electrostatic interactions to the anisotropic intermolecular potential), are used to delineate the short- and long-range...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics