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  • 1
    Electronic Resource
    Electronic Resource
    Order parameter spatial variation and anchoring energy for nematic liquid crystals (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6968-6973 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A spatial variation of the nematic scalar order parameter leads to a surface anchoring energy renormalization. This renormalization is a consequence of torque conservation and of the "macroscopic'' definition of the surface orientation. The order change comes from an assumed property of the boundary or from an external curvature constraint inducing surface melting. In both cases, the maximum effect leads to a surface extrapolation length comparable with the nematic-isotropic coherence length. Strong anchoring data should be remeasured and reinterpretated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347634
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  • 2
    Electronic Resource
    Electronic Resource
    Size and surface effect in nematic-isotropic phase transition of a liquid crystal (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2063-2067 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The size and surface effects on the nematic-isotropic phase transition of a liquid crystal are analyzed using a functional form of the surface energy proportional to the square of the scalar order parameter. The evaluated temperature shift agrees with the published experimental observations. This form seems confirmed by experimental data of the anchoring energy versus temperature, determined by means of the Freedericksz technique. The obtained formula for the temperature shift is similar to the well-known Thomson formula, usually considered in the classical phase transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346558
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  • 3
    Electronic Resource
    Electronic Resource
    Surface polarization and flexoelectric effect (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6343-6348 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to evaluate the order of magnitude and to establish the origin of the surface polarization, experimental investigations of direct piezoelectrical effect in nematic liquid crystals have been performed. The experimental setup used allows the temperature dependence of the electrical response of a nematic sample, submitted to periodic acoustic perturbation of one boundary, to be determined. The experimental data show that the contribution of the surface polarization to the electrical response of the nematic sample is usually negligible with respect to the flexoelectric polarization. An estimation of the flexoelectric coefficients of various liquid crystals is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348834
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  • 4
    Electronic Resource
    Electronic Resource
    Surface order transition in nematic liquid crystals induced by the flexoelectric polarization (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5549-5554 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of the flexoelectric polarization on the nematic surface energy is analyzed. It is shown that if the dielectric constant of the substrate is lower than a critical value the undistorted orientation is no more the one corresponding to lowest energy. The presence of a conducting substrate is also considered. In this case it is shown that by changing the thickness of the dielectric material deposited over the conducting material, a surface order transition is expected. Furthermore, the influence of a finite anchoring energy between nematic and substrate on the critical value of the dielectric constant is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347015
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  • 5
    Electronic Resource
    Electronic Resource
    Asymmetric ionic adsorption and cell polarization in liquid crystals (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 2646-2648 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model to determine the steady-state distribution of ionic charges in a liquid sample, in the shape of a slab, whose limiting surfaces are supposed to adsorb positive ions with different adsorption energies, is proposed. It is used to explain the asymmetric electro-optical response in a liquid-crystal cell recently observed. The ionic adsorption gives rise to a difference of potential between the surfaces which can be responsible for the existence of an internal field. It changes the effective voltage thresholds for the reorientation of the liquid crystal when external fields are applied. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372231
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  • 6
    Electronic Resource
    Electronic Resource
    Flexoelectric properties and optical activity of a nematic liquid crystal (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2544-2547 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The rotation of the polarization plane of a polarized light beam through a hybrid aligned liquid-crystal cell is described, by taking into account the joint effect of the weak anchoring and of the flexoelectricity in the presence of an electric field normal to the initial deformation plane and smaller than Fréedericksz' threshold [H. Kelker and R. Hatz, Handbook of Liquid Crystals (Chemie, Weinheim, 1980), pp. 160–188]. Such a rotation is shown to be proportional to the square root of the difference between the actual and the critical thickness of the cell in the case of small thicknesses (which are interesting in the display technology) whereas in the case of larger thicknesses the same relation deduced by Durand's group for strong anchoring is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336282
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  • 7
    Electronic Resource
    Electronic Resource
    An electro-optic device based on field-controlled anchoring of a nematic liquid crystal (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1616-1618 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A surface-controlled electro-optic device using a nematic liquid crystal enclosed between two thin spaced glass plates is presented. Modulation angles of the optic axis up to more than 70° can be achieved even for small applied voltages. The switching of the optic axis occurs with a large component in the plane of the sample even though the electric field is applied normal to the sample surfaces. The effect seems to be driven by the dielectric coupling of the liquid crystal molecules with the applied electric field. The field induced switching process is governed by the bounding surfaces that have been covered with obliquely evaporated SiOx. The mechanism of the phenomenon is briefly discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122223
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  • 8
    Electronic Resource
    Electronic Resource
    Selective ions adsorption and nonlocal anchoring energy in nematic liquid crystals (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2678-2680 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent measurements have demonstrated the nonlocal character of the angular anchoring energy of a nematic liquid-crystal orientation close to a solid substrate. Assuming a sign selective adsorption for ions on such a substrate, we calculate the surface charge and field. It exists a macroscopic cell thickness below which the surface can adsorb most of the volume charges. In this regime, because of the coupling of the surface field with the nematic director, the surface anchoring energy depends on the thickness, and can even become zero. This model explains the observed thickness dependence of the anchoring energy and the "spontaneous'' Freederickcsz transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345484
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  • 9
    Electronic Resource
    Electronic Resource
    Optical determination of large distortion surface anchoring torques in a nematic liquid crystal
    Amsterdam : Elsevier
    Physics Letters A 103 (1984), S. 385-388 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(84)90137-3
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  • 10
    Electronic Resource
    Electronic Resource
    Life events occurring in families of children with recurrent abdominal pain
    Amsterdam : Elsevier
    Journal of Psychosomatic Research 28 (1984), S. 185-188 
    Details
    ISSN: 0022-3999
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3999(84)90018-7
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