Depanshu Varshney

Aligarh Muslim University | AMU · Department of Physics

From the time of their revelation, liquid crystals (LCs) are stimulating scientific curiosity in the basic and applied research of these materials as they simultaneously encompass the several properties of liquid as well as crystalline phases. Even after developing various breakthrough technologies from the many facets of LC materials, a refinement...

Herein, we report the synthesis of ferroelectric layered perovskite Bi4Ti3O12 (BT4) nanoparticles (NPs) and the temperature-dependent dielectric and electro-optical (especially memory effect) properties of 4-pentyl-4'-cyanobiphenyl (5CB) nematic liquid crystal (NLC) doped with 1 wt % BT4 NPs (i.e. 5CB-BT4 composite) using polarising optical microsc...

We report here the concentration and temperature dependent optical, electro-optical and dielectric studies on bismuth titanate (Bi2Ti2O7/Bi4Ti3O12) nanocomposite (BT2/BT4 NC, ∼42 nm) doped nematic liquid crystal (NLC, 5CB) mixtures using optical polarising microscope and dielectric spectroscopic techniques. The optical textures confirm the uniform...

In this article, we present the formulation, characterization, and application of a newly prepared ferroelectric liquid crystal (FLC) mixture namely W315 composed of pyrimidine compounds. The characterization of FLC material under investigation has been performed through polarizing optical microscopic, dielectric spectroscopic, differential scannin...

Present studies investigate the effect of gamma irradiation in the dielectric and electro-optical properties of a nematic liquid crystal (NLC) 4 cyano-4′-pentylbiphenyl (also referred to as 5CB) at the room temperature using the dielectric spectroscopy and the polarizing optical microscopic techniques. The value of dielectric permittivity (ε′) of 5...

Recently nanoparticles (NPs) are extensively explored as the dopant in liquid crystal (LC) materials because of their phenomenal properties such as good guest–host interaction and high surface to volume ratio. Keeping this motivation into mind, we have observed the influence of newly synthesized cobalt oxide (CoO) NPs on the dielectric and optical...

Here, we demonstrate experimentally the existence oftemporally variable dielectric behavior of a nematic liquid crystal (NLC), the most widely used liquid crystal (LC) phase among all LCs materials, by mixing dimethylsulphoxide (DMSO) into former. The intermolecular interactions and nanosegregation of the molecular LC structures have influenced th...

In this research article, we have investigated the dielectric properties of a nematic liquid crystal (NLC), namely 4 cyano-4′- pentylbiphenyl (which is commonly known as 5CB), in sample cells of variable thickness. The dielectric behaviour has been studied through a LCR meter in the frequency ranging from 20 Hz to 1 MHz. It was observed that the re...