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  • 1995-1999  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Temperature variations in the director orientation and anchoring energy at the surface of cholesteric layers (1996)
    Springer
    JETP letters 63 (1996), S. 43-49 
    Details
    ISSN: 1090-6487
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Slight changes with temperature in the director orientation at the surface of a perfect planar cholesteric liquid crystal (CLC) layer, which are precursors of a jump in the pitch of the cholesteric helix, are observed by measuring the temperature dependence of the optical transmission spectra of the layer. The observed changes in the director orientation are described in the framework of the continuum theory of CLCs, supplemented with allowance for the surface anchoring forces. In particular, the angle of deviation of the director at the surface from the alignment direction at the exact temperature of the jump in pitch is expressed in terms of the anchoring potential. The relation obtained is use to find the anchoring potential in the samples.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.566961
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Temperature hysteresis of the change in the cholesteric pitch and surface anchoring in thin planar layers (1997)
    Springer
    Journal of experimental and theoretical physics 85 (1997), S. 285-291 
    Details
    ISSN: 1090-6509
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Hysteresis of the temperature of jumps in the cholesteric pitch in planar layers of cholesteric liquid crystals (CLCs) has been observed in the temperature dependence of the optical transmission spectra measured in a 4.8 ¼m thick specimen of a 60% chiral racemic mixture of CE6. The temperature difference for the pitch jumps during heating and cooling was equal to about 0.1°C near 40.3°C. No difference in the temperature of the pitch jumps during heating and cooling was observed for an 18 µm thick specimen. A theoretical description of this hysteresis is presented on the basis of a continuum theory of elasticity of CLCs that also takes account of the surface anchoring of the CLC. Different possible mechanisms leading to a change in the director configuration in the layer during a pitch jump and their correspondence to the jump mechanism and hysteresis which occur in the experimental specimens are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.558276
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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