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Blocking of Phase Transitions in Liquid Crystal 5*CB (Isopentylcyanobiphenyl) as a Result of Surface Interactions in the Nanomembranes

100%
Bąk A., Chłędowska K., Inglot P.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2
147-149
EN
In this paper we present the results of dielectric measurements of liquid crystal (LC) 5*CB arranged in porous matrices with a pore diameter of 100 and 20 nm. We analyse the effect of the surface interactions on the dynamics of the molecules. The results are compared with the results for bulk 5*CB. The most important observation is the blocking of the phase transition of 5*CB into the solid phase in the matrix with pore diameter of 20 nm.
2
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Dynamics and Phase Transitions of 4-Bromobenzylidene-4'-pentyloxyaniline and 4-Bromobenzylidene-4'-hexyloxyaniline as Studied by Dielectric Spectroscopy

64%
Osiecka N., Massalska-Arodź M., Galewski Z., Chłędowska K., Wróbel S., Morito T., Yamamura Y., Saito K.
Acta Physica Polonica A
|
2013
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vol. 124
|
issue 6
913-916
EN
Significant differences in phase sequence and dynamics between 4-bromobenzylidene-4'-pentyloxyaniline (5BBA) and -bromobenzylidene-4'-heksyloxyaniline (6BBA) substances were detected by broadband dielectric spectroscopy. In the smectic A (6BBA), the smectic B (found in both substances) and the smectic E (5BBA) phases the relaxation was ascribed to reorientations of the molecules around the short axes. Slow dynamics detected in the smectic E and in two crystalline phases of 5BBA was ascribed to conformational changes of molecular chains. Coexistence of Cr(I) and Cr(II) conformationally disordered crystal (CONDIS) phases was observed and vitrification of Cr(II) was identified with help of polarizing microscopy.
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