ORIENTATIONAL STRUCTURE OF NEMATIC LIQUID CRYSTAL CONFINED BY PORES OF POLYMER FILMS
Abstract
The paper describes a method of detection orientational structure of liquid
crystals inside a pore of porous film. Measurement of electric capacity of
composite material (porous film is filled with liquid crystals) in dependence on
temperature is main principle of this method. Porous polyethylene terephthalate
films (track membranes) were used in experiments because of fabrication of different
pores radius and orientation is easy. The porous films with different pores
radius 75, 170, 210, 300 and 425nm were investigated. New type of liquid crystal
cell was used in experiments. Surfaces of the porous films were covered by conducting
electrodes. Results of a theoretical calculation based on the experimental
data shown that escaped radial structure of liquid crystal formed in pores of polyethylene
terephthalate films.
crystals inside a pore of porous film. Measurement of electric capacity of
composite material (porous film is filled with liquid crystals) in dependence on
temperature is main principle of this method. Porous polyethylene terephthalate
films (track membranes) were used in experiments because of fabrication of different
pores radius and orientation is easy. The porous films with different pores
radius 75, 170, 210, 300 and 425nm were investigated. New type of liquid crystal
cell was used in experiments. Surfaces of the porous films were covered by conducting
electrodes. Results of a theoretical calculation based on the experimental
data shown that escaped radial structure of liquid crystal formed in pores of polyethylene
terephthalate films.
About the Authors
С. Пасечник
Московский государственный университет приборостроения и информатики
Russian Federation
Russian Federation
Д. Семеренко
Московский государственный университет приборостроения и информатики
Russian Federation
Russian Federation
Д. Шмелёва
Московский государственный университет приборостроения и информатики
Russian Federation
Russian Federation
А. Чопик
Московский государственный университет приборостроения и информатики
Russian Federation
Russian Federation
References
1. Apel, P. Track etching technique in membrane technology // Radiation Measurements. - 2001. - Vol. 34. - p. 559-566
2. Bradac, Z., Kralj S., and Zumer S. Molecular dynamics study of nematic structures confined to a cylindrical cavity // Phys. Rev. E. - 1998. - Vol. 58, N.6. - p. 7447-7454
3. George Cordoyiannis, Lynn K. Kurihara, Luz J. Martinez-Miranda, Christ Glorieux, and Jan Thoen. Effects of magnetic nanoparticles with different surface coating on the phase transitions of octylcyanobiphenyl liquid crystal // Phys. Rev. E.- 2009. - Vol/ 79, N.1. - p. 011702-011706
4. Crawford, G.P. and Zumer S. Liquid Crystals in Complex Geometries. - London: "Taylor & Francis", 1996
5. Renata-Maria Marroum, Germano S. Iannacchione, Daniele Finotello and Michael A. Lee. Numerical study of cylindrically confined nematic liquid crystals //Phys. Rew. E. - 1995. - Vol. 51, N. 4. - p. R2743-2746
6. Pasechnik, S.V., Chigrinov V.G. and Shmeliova D.V. Liquid Crystals. Viscous and Elastic Properties.- Berlin: "Wiley - VCH", 2009
7. Semerenko, D., Shmeliova D., Pasechnik S., Murauskii A., Tsvetkov V. and Chigrinov V. Optically controlled transmission of porous polyethylene terephthalate films filled with nematic liquid crystal // OPTICS LETTERS. - 2010. - V. 35, N 13. - p. 2155 - 2157
8. Weiss, S., Ouyang H., Zhang J. and Fauchet Ph. Electrical and thermal modulation of silicon photonic bandgap microcavities containing liquid crystals //Optics Express. - 2005. - Vol. 13, N. 4. - p. 1090-1097
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