Effect of temperature on the photoalignment of azo dyes in thin films

Mikulich, V. S.; Murauski, Anatoli; Muravsky, Alexander; Agabekov, V. E.

doi:10.1134/s0036024416030262

Cited by 2 publications

(2 citation statements)

References 41 publications

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“…Temperature is an alternative way to block the cis-trans isomerization. It is established that the azo-dye photoalignment layer photosensitivity completely disappears at 103 °C and reappears at room temperature (Mikulich et al, 2016a). At the same time, the temperature neither affects the ability of the dye layer to orient liquid crystals nor changes the alignment direction as photoalignment azo-dye molecules are the salts of alkali metals that form intermolecular coordination bonds (Muravsky, 2009).…”

Section: Photoinduced Hole-dipole Photoalignment Mechanismmentioning

confidence: 99%

Q&A of liquid crystal alignment: theory and practice

Muravsky,

Murauski

2024

Front. Soft Matter

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We selected and summarized the most important aspects of liquid crystal alignment. Alignment by the surface profile and flat surface alignment are discussed as the main factors leading to the high-quality orientation of liquid crystals. The advanced level of understanding and formulation allows linking the alignment layer properties to the molecular structure of the alignment material. The paper reviews and combines the latest knowledge about liquid crystal alignment, dwells upon the relationship between the polar and azimuthal anchoring energy, explains the major particularities regarding anchoring measurements in the case of birefringent alignment materials with truly high azimuthal anchoring energy, and observes the current trends of water-friendly alignment materials and their application in geometrical phase device fabrication.

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Section: Photoinduced Hole-dipole Photoalignment Mechanismmentioning

confidence: 99%

Q&A of liquid crystal alignment: theory and practice

Muravsky,

Murauski

2024

Front. Soft Matter

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“…Cell preparation, photopatterning, filling with CCN47, and imaging were done on the same day to prevent any aging effect. It was expected that the temperature [39] and humidity [40] during the sample preparation and irradiation would affect the values of W. W would also be a function of temperature after the cell is assembled [41]. To avoid these effects, all experiments were performed at fixed conditions.…”

Section: Nematic Materialsmentioning

confidence: 99%

Azimuthal Anchoring Strength in Photopatterned Alignment of a Nematic

et al. 2021

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Spatially-varying director fields have become an important part of research and development in liquid crystals. Characterization of the anchoring strength associated with a spatially-varying director is difficult, since the methods developed for a uniform alignment are seldom applicable. Here we characterize the strength of azimuthal surface anchoring produced by the photoalignment technique based on plasmonic metamsaks. The measurements used photopatterned arrays of topological point defects of strength +1 and −1 in thin layers of a nematic liquid crystal. The integer-strength defects split into pairs of half-integer defects with lower elastic energy. The separation distance between the split pair is limited by the azimuthal surface anchoring, which allows one to determine the strength of the latter. The strength of the azimuthal anchoring is proportional to the UV exposure time during the photoalignment of the azobenzene layer.

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Effect of temperature on the photoalignment of azo dyes in thin films

Cited by 2 publications

References 41 publications

Q&A of liquid crystal alignment: theory and practice

Q&A of liquid crystal alignment: theory and practice

Azimuthal Anchoring Strength in Photopatterned Alignment of a Nematic

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