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Tunable dielectric and conductivity properties of two 4-n alkoxy benzoic acid

Patari S., Nath A.

Opto-Electronics Review

2018

Vol. 26, No. 1

35--43

We have presented dielectric and conductivity studies of two liquid crystal (LC) compounds- p-octyloxybenzoic acid (8OBA) and p-decyloxybenzoic acid (10OBA). Dielectric permittivity study of those compounds gives the evidence of space charge polarization and ionic conductance in the samples. Dielectric permittivity is found to be the highest for 8OBA than 10OBA. Both compounds found to exhibit positive dielectric anisotropy. Splay elastic constant as a function of temperature has also been investigated. Frequency and temperature dependent electrical conductivity of these two LC compounds have been studied in detail. Activation energy has been estimated from both dc and ac conduction process.

Dispersion of fluorescent dye in the nematic liquid crystal : enhanced photoluminescence and high birefringence

Pathak G., Agrahari K., Roy A., Srivastava A., Strzezysz O., Garbat K., Manohar R.

Opto-Electronics Review

2018

Vol. 26, No. 4

317--324

In the present investigation optical, electro-optical and dielectric properties have been measured for nematic liquid crystal (NLC) material 1550C which is consisted of 4’-(trans, trans-4-alkylbicyclohexyl) carbonates and 4’-(4-(trans,trans-4-alkyl)-4-cyanobicyclohexane, dispersed with fluorescent dye (Benzo 2,1,3 Thiadiazole) in two different concentrations. Photoluminescence has been enhanced for dye dispersed system which is the key finding of this investigation. UV absorbance study has also been performed and found to be increased for composite system. Enhanced birefringence after dispersion of dye into pure NLC is also a prominent result of this investigation. Relative permittivity, threshold voltage and dielectric anisotropy have also been measured and found to be increased. The outcome of the present work may be very useful in the construction of liquid crystal displays (LCDs).

Application possibilities of nanoparticles for modification of parameters of liquid crystal materials

Hotra Z., Mykytyuk Z., Fechan A., Sushynskyy O., Yasynovska O., Kotsun V., Levenets V., Kalita W., Błąd G.

Elektronika : konstrukcje, technologie, zastosowania

2010

Vol. 51, nr 8

125-128

The influence of different kinds of nanoparticles on the electrical characteristics of induced cholesterics based on 5CB and 1289 nernatic matrix with the addition of chiral dopant has been experimentally investigated. The effects of nanoparticles on the dielectric properties of liquid crystal materials were detected and analyzed.

W pracy zaprezentowano wyniki badań nad wpływem domieszkowania różnego typu nanoczasteczek na charakterystyki cholesteryków na bazie materiałów nematycznych. Przeanalizowano również właściwości dielektryczne materiałów ciekłokrystalicznych po domieszkowaniu.