Journal ArticleDOI
Alignment of nematics and smectics on evaporated films
W. Urbach,M. Boix,E. Guyon +2 more
TLDR
In this article, the alignment of nematics and smectics on substrates where an obliquely evaporated thin film has been previously deposited is discussed, and it is shown that the surface anchoring energy is substantially larger than with the traditional rubbing technique.Abstract:
We discuss the alignment of nematics and smectics on substrates where an obliquely evaporated thin film has been previously deposited. In the planar samples, the surface anchoring energy is substantially larger than with the traditional rubbing technique. We can also uniformly align the liquid crystals obliquely, in particular by coating the evaporated film by a surfactant.read more
Citations
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Journal ArticleDOI
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
Accurate determination of liquid‐crystal tilt bias angles
T. J. Scheffer,J. Nehring +1 more
TL;DR: In this article, a detailed analysis is given for three techniques used to determine the tilt bias angle of a nematic liquid crystal in contact with a boundary surface, including crystal rotation, capacitive and magnetic null methods.
Journal ArticleDOI
Thin film retardation plate by oblique deposition
Tomoyoshi Motohiro,Yasunori Taga +1 more
TL;DR: Homogeneous quarterwave plates with a bilayered structure 60 x 250 mm in size and ~3 microm thick on glass substrates are developed which showed promising optical properties which can compete with the conventional types of retardation plate.
Journal ArticleDOI
Tempearture Dependence of Tilt, Pitch and Polarization in Ferroelectric Liquid crystals
TL;DR: In this paper, the pitch of the helica texture is measured optically and the importnt parameter of the C* phase in a series of schiff bases is measured using an optically measured pitch measure.
Journal ArticleDOI
Surface defects and structural transitions in very low anchoring energy nematic thin films
G. Ryschenkow,M. Kleman +1 more
TL;DR: In this paper, it was shown that the products of degradation of heated paper evaporated on glass constitute a low anchoring energy substrate for the nematic phase of MBBA (methoxy benzylidene butylaniline).
References
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Journal ArticleDOI
An analogy between superconductors and smectics A
TL;DR: The role of the phase in the second order smectic A↔ nematic transition is similar to the role of phase functions in superconductors as mentioned in this paper, where twist and bend distortions correspond to magnetic fields.
Journal ArticleDOI
Thin film surface orientation for liquid crystals
TL;DR: Vacuum-deposited films have been used in substrate preparation for liquid-crystal cells as mentioned in this paper to provide an oriented surface for alignment of nematic liquid crystals far better than the well-known ''rubbed'' plate.
Journal ArticleDOI
Oblique‐Incidence Anisotropy in Evaporated Permalloy Films
TL;DR: In this paper, a self-shadowing model is proposed to explain chain growth, i.e., the area behind a crystallite is left vacant because it is in the crystallite's shadow.
Journal ArticleDOI
Elastic Constants of the Nematic Liquid Crystalline Phase of p‐Methoxybenzylidene‐p‐n‐Butylaniline (MBBA)
TL;DR: In this article, the bend and splay elastic constants of MBBA were measured over its nematic temperature range and the ratio of the two constants is 1.25± 0.05.
Journal ArticleDOI
Orientation of a nematic liquid crystal by suitable boundary surfaces
TL;DR: In this paper, the adsorption of a monolayer of hexadecyltrimethylammonium bromide (CTAB) on glass-slides allows the preparation of monocrystal of p-n -methoxybenzilidene-p -butylaniline (MBBA) oriented either prependicularly to surfaces or in a direction parallel to surfaces (planar anchorage).