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Liquid crystal alignment in cylindrical microcapillaries

Chychłowski M., Yaroshchuk O., Kravchuk R., Woliński T.

Opto-Electronics Review

2012

Vol. 20, No. 1

47-52

A variety of alignment configurations of liquid crystals (LCs) inside the glassy cylindrical capillaries is realized by using alignment materials providing different anchoring. The radial configuration with central disclination line is obtained for homeotropic boundary conditions. In turn, the axial, transversal and tilted alignment structures are realized by using materials for planar anchoring. The uniformity and controlling of the latter structures were provided by photoalignment method. This approach can be further used to control LC alignment in the photonic crystal fibers recognized as advanced elements for different optical devices.

Interference investigations of liquid crystal-polymer composites structure

Maksymyak P., Negrych A., Dolgov L., Yaroshchuk O.

Optica Applicata

2009

Vol. 39, nr 3

571-578

The methods of correlation optics are for the first time applied to study the structure of liquid crystal-polymer (LC-P) composites. Their phase correlation function (PCF) was obtained considering LC-P composite as a random phase screen. The amplitude of PCF contains information about the number of LC domains and structure of LC director inside of them, while a half-width of this function is connected with the size of these domains. In good agreement with previous studies by SEM technique we detected a monotone decrease of LC domains with polymer concentration. When applying the electric field, for the samples with ?P > 35 vol.% (PDLC morphology), the amplitude of PCF is monotonic. On the contrary, if ?P < 35 vol.% (PNLC morphology) the amplitude of PCF is non-monotonic and, depending on the applied voltage, goes through maximum.

Effect of confinement to porous glass on structure and optical properties of alkylcyanobiphenyls.

Bezrodnaya T., Gavrilko T., Gnatyuk I., Yaroshchuk O., Puchkovskaya G., Baran J., Ratajczak H., Kukielski J.I.

Optica Applicata

2000

Vol. 30, nr 4

585-590

The 4-n-alkyl-4'-cyanobiphenyls (nCB, n is the number of carbon atoms in alkyl radical n=5, 8) confined to porous glasses with four different mean pore sizes (2, 4, 54 and 90 nm) have been studied. Using FT MIR and NIR spectroscopy methods we have investigated the interaction of nC8 molecules with the pore surface. It has been shown that the interaction is accompanied by the formation of hydrogen bonds between the SiOH group on the glass pore surface and the cyano-group of the nCB monomer. This is demonstrated by the change in the position and shape of CN stretching and Q(C identical to N)+Q(C=C) combination bands in the vibrational spectra of confined nCB depending on pore size and the length of the alkyl tail. To the contrary, in the case of benzophenone confined to PG, weak pi ...OH-Si hydrogen bonds are formed.