Raman spectra and dynamic properties of molecules of nematic liquid crystals

1982 ◽  
Vol 37 (3) ◽  
pp. 1037-1042
Author(s):  
S. E. Yakovenko ◽  
V. I. Naumenko ◽  
A. A. Min'ko ◽  
N. M. Ksenofontova
Keyword(s):  
Liquid Crystals ◽  
Raman Spectra ◽  
Dynamic Properties ◽  
Nematic Liquid Crystals

scholarly journals The Raman Spectra of Aligned Thin Films of Nematic Liquid Crystals

1980 ◽  
Vol 53 (11) ◽  
pp. 3054-3058 ◽  
Author(s):  
Haruka Yamada ◽  
Keiji Fukumura ◽  
Bun-ichi Tamamushi
Keyword(s):  
Thin Films ◽  
Liquid Crystals ◽  
Raman Spectra ◽  
Nematic Liquid Crystals

Raman spectra and molecular orientation statistics for nematic liquid crystals

1982 ◽  
Vol 37 (2) ◽  
pp. 962-965
Author(s):  
S. E. Yakovenko ◽  
V. I. Naumenko ◽  
A. A. Min'ko ◽  
N. M. Ksenofontova
Keyword(s):  
Liquid Crystals ◽  
Raman Spectra ◽  
Molecular Orientation ◽  
Nematic Liquid Crystals ◽  
Orientation Statistics

Broad-Band Dielectric Spectroscopy of Liquid Crystals Confined in Random and Cylindrical Pores

1996 ◽  
Vol 464 ◽  
Author(s):  
G.P. Sinha ◽  
F.M. Aliev
Keyword(s):  
Liquid Crystals ◽  
Dielectric Spectroscopy ◽  
Dynamic Properties ◽  
Nematic Liquid Crystals ◽  
Broad Band ◽  
Low Frequency ◽  
Molecular Rotation ◽  
Retardation Factor ◽  
Short Axis ◽  
Cylindrical Pores

ABSTRACTUsing dielectric spectroscopy in the frequency range 0.1 Hz-1.5 GHz, we investigated the influence of confinement on the dynamic properties of polar nematic liquid crystals (LC) dispersed in porous matrices with randomly oriented, interconnected pores as well as in parallel cylindrical pores with different, pores sizes. The confinement has a strong influence on the dielectric properties of LC which resulted in the appearance of a low frequency relaxational process (f ≤ 10 KHz) absent in bulk and a strong modification of modes due to the molecular rotation around short axis and librational motion. The differences between bulk and confined behavior are: (a) - the dielectrically active modes in confined LC are not frozen even at temperatures about 20 degrees below the bulk crystallization temperature; (b) - in the temperature range corresponding to the anisotropie phase in pores, lnτ, where τ is the relaxation time corresponding to the molecular rotation around short axis, is not a linear function of 1/T and there is an evidence for smectic type order formation at sufficiently low T; (c) - the retardation factor g = τ/τis is ≃ 1.5, where as the typical value of g in bulk nematic liquid crystals is ≃ 4; (d) - smooth and small changes in T at phase transition in pores suggest that the “isotropie” phase of LC in pores is not bulk like isotropie phase with complete disorder in molecular orientations, and some degree of orientation order still persists.

Dynamic Properties of Nematic Liquid Crystals

2014 ◽  
pp. 1-34
Author(s):  
Igor Muševič ◽  
Primož Ziherl ◽  
Robert Blinc
Keyword(s):  
Liquid Crystals ◽  
Dynamic Properties ◽  
Nematic Liquid Crystals

The electrohydrodynamic instability in twisted nematic liquid crystals

1994 ◽  
Vol 4 (2) ◽  
pp. 239-252 ◽  
Author(s):  
A. Hertrich ◽  
A. P. Krekhov ◽  
O. A. Scaldin
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Electrohydrodynamic Instability ◽  
Twisted Nematic

Surface disclinations in nematic liquid crystals

1975 ◽  
Vol 36 (1) ◽  
pp. 59-67 ◽  
Author(s):  
V. Vitek ◽  
M. Kléman
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals
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