Wydział Fizyki Technicznej, Informatyki i Matematyki Stosowanej / Faculty of Technical Physics, Information Technology and Applied Mathematics / W7

Stały URI zbioruhttp://hdl.handle.net/11652/7

Przeglądaj

Filtry

2015 - 20172

Ustawienia

Autorsearch.filters.applied.operator.equals: search.filters.author.Derfel, GrzegorzTematsearch.filters.applied.operator.equals: search.filters.subject.nematics

Wyniki wyszukiwania

Teraz wyświetlane 1 - 2 z 2
  • Pozycja
    Influence of tilted surface alignment on flexoelectric domains in twisted nematic layers
    (Wydawnictwo Politechniki Łódzkiej, 2017) Buczkowska, Mariola; Derfel, Grzegorz
    The small deformations induced by electric field in twisted flexoelectric nematic layers were simulated numerically. The onedimensional (i.e. homogeneous over the whole area of the layer) and two-dimensional (i.e. spatially periodic flexoelectric domains) deformations were considered. It was shown that the periodic deformations do not arise if sufficiently high pretilt angle is imposed by the boundary conditions. The value of pretilt angle necessary for elimination of domains increases with the flexoelectric coefficient e33. This result is of practical meaning because the flexoelectric domains are undesirable from an applicative point of view since they destroy the homogeneous appearance of the area of an excited pixel of a display.
  • Pozycja
    Macroscopic model formulae describing anisotropic anchoring of nematic liquid crystals on solid substrates.
    (Wydawnictwo Politechniki Łódzkiej, 2015) Derfel, Grzegorz; Buczkowska, Mariola
    Formulae used for description of anchoring energy of nematic liquid crystal aligned on solid substrates are reviewed. They are based on macroscopic approach considering the concepts of the easy axis and of the anchoring strength parameters. Properties of the modified formula proposed in our earlier article are illustrated by exemplary plots which allows for comparison with other formulae. The modified formula describes the dependence of energy on the azimuthal and polar deviation of director from the easy axis and is valid qualitatively for deviation of any magnitude.