Browsing School of Engineering by Author "VIJ, JAGDISH KUMAR"
Now showing items 21-40 of 43
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High-frequency dielectric behavior of a ferroelectric liquid crystal near the smectic-C*-smectic-A phase transition
VIJ, JAGDISH KUMAR (American Physical Society, 1992)The temperature and frequency dependence of the complex dielectric susceptibility of a ferroelectric liquid crystal (FLC) near the smectic-C*-smectic-A phase transition has been calculated using the generalized Landau ... -
The investigation of the relaxation processes in antiferroelectric liquid crystals by electro-optic spectroscopy
VIJ, JAGDISH KUMAR; PANARIN, YURI PETROVICH (American Institute of Physics, 1998)Electrooptic spectroscopy of an antiferroelectric liquid crystal is carried out over a range of frequencies from 1 Hz to 100 kHz. In the antiferroelectric SmCA phase two relaxation processes are found, one at the fundamental ... -
Localized relaxation in a glass and the minimum in its orientational polarization contribution
VIJ, JAGDISH KUMAR (American Institute of Physics, 2002)The dielectric permittivity and loss spectra of the glassy state of 5-methyl-2-hexanol obtained by quenching it from the liquid state has been studied. In one experiment, the spectra were studied at different temperatures ... -
Localized relaxation's strength and its mimicry of glass-softening thermodynamics.
VIJ, JAGDISH KUMAR (American Institute of Physics, 2002)The dielectric relaxation strength of the ? process, ???, in a rigid-molecular glass of 16.6 mol?% chlorobenzene cis-decalin mixture increases slowly with temperature, T, until the glass-softening range is reached, and ... -
Measurement of the polarization profile across a surface-stabilized ferroelectric liquid crystal cell using the pyroelectric laser-intensity-modulation method
VIJ, JAGDISH KUMAR (American Institute of Physics, 2003)The pyroelectric technique, called the laser-intensity-modulation method, was used for investigations of the spatial distribution of the pyroelectric coefficient that gives information about the director profile in ... -
Mechanical load cell based on cavity-controlled microwave oscillators
VIJ, JAGDISH KUMAR (IEEE, 1991)A device consisting of a rectangular resonator to which two oscillators are coupled at right angles to each other is described. The frequency of each oscillator is controlled by the cavity, and distortions caused by ... -
Molecular dynamics of iso-amyl bromide by dielectric spectroscopy, and the effects of a nonpolar solvent, 2-methylpentane, on the spectral features
VIJ, JAGDISH KUMAR (American Institute of Physics, 1999)To gain insight into the effects of the weakening of the electrostatic interactions on molecular dynamics when polar molecules are dissolved in a nonpolar solvent, the dielectric polarization and relaxation behaviors of ... -
Molecular tilt angle and order parameter of low molar mass ferroelectric liquid crystal using IR spectroscopy
VIJ, JAGDISH KUMAR; PEROVA, TANIA (1996)Fourier transform infrared spectroscopy of a ferroelectric liquid-crystalline material: 4-(3)-(S)- methyl-2-(S)-chloropentanoyloxy-4'-octyloxy-biphenyl has been investigated in the wavenumber range 450 - 4000 cm-1 for ... -
Nonexponential dielectric relaxation dynamics in supercooled liquid and glassy states of isoamyl bromide and 2-methylpentane mixtures
VIJ, JAGDISH KUMAR (American Institute of Physics, 2001)The dielectric spectra of mixtures of the polar solute isoamyl bromide in 2-methylpentane have been investigated in the frequency range 1 mHz to 1 MHz and in the temperature range approaching the glass transition temperature. ... -
Observation of an anchoring transition in a discotic liquid crystal
VIJ, JAGDISH KUMAR; PEROVA, TANIA (EDP Sciences, 1998)We report the anchoring transition in a discotic liquid crystal, hexapentyloxytriphenylene (HPT), from edge-on to side-on alignment in a discotic phase. The topology, easy direction of orientation and the coating of the ... -
On the internal field correction in far ]infrared absorption of highly polar molecules in neat liquids and dilute solutions
VIJ, JAGDISH KUMAR (American Institute of Physics, 1993)Far-infrared absorption spectra for liquid acetone, methylene chloride, acetonitrile, methyl iodide, and their dilute solutions in cyclohexane at 20?C are measured by molecular laser spectrometer. Measurements of dielectric ... -
Optical rotatory power of different phases of an antiferroelectric liquid crystal and implications for models of structure
VIJ, JAGDISH KUMAR (American Physical Society, 2001)The investigation of the antiferroelectic liquid crystal (AFLC) was presented. The crystal was found to possess different helical smectic phases identified through a texture under cross-polarizers with a homeotropic alignment ... -
Orientational/translational relaxation in aqueous electrolyte solutions : a molecular model for microwave/far-infrared ranges
VIJ, JAGDISH KUMAR (Royal Society of Chemistry, 2001)A model is given where the complex permittivity of an electrolyte solution is calculated as a superposition of the contributions due to the translation of ions and the reorientation of water molecules, which occur in ... -
Relaxation strength of localized motions in D. Sorbitol and mimicry of glass-softening thermodynamics
VIJ, JAGDISH KUMAR (American Institute of Physics, 2003)The dielectric relaxation strength, ??JG, the relaxation rate, fm,JG and the distribution parameter, ?JG, of the faster relaxation process in D-sorbitol have been studied as a function of temperature and the cooling rate. ... -
Rotational bias of an antiferroelectric liquid crystal studied by polarized Fourier transform infrared spectroscopy
VIJ, JAGDISH KUMAR; PEROVA, TATIANA (1999)Experimental studies of the absorbance vs polarization angle of the incident ir beam on a cell have been carried out for several absorbance bands in the SmA phase and in electrically induced ferroelectric states F(1) and ... -
Self-assembled uniaxial and biaxial multilayer structures in chiral smectic liquid crystals frustrated between ferro- and antiferroelectricity
FUKUDA, ATSUO; PANOV, VITALI; VIJ, JAGDISH KUMAR (2004)With a view to obtain a molecular model for the subphases produced by the frustration between ferro- and antiferroelectricity in chiral smectic liquid crystals, we report results on two compounds and observe (i) the staircase ... -
Self-assembly of biaxial ordering and molecular tilt angle of chiral smectic liquid crystals in hometropically aligned cells investigated using Fourier transform infrared spectroscopy
FUKUDA, ATSUO; VIJ, JAGDISH KUMAR (American Physics Society, 2005)Temperature dependences of the infrared absorbance have been measured for the four chiral liquid crystal samples in the homeotropic cell configuration. It is shown that the values of the orientational order parameter S ... -
Solitary wave propagation in antiferroelectric liquid crystal cells and the quadrupolar term in the interlayer interaction
SONG, JANG-KUN; VIJ, JAGDISH KUMAR (American Physics Society, 2007)Planar antiferroelectric liquid crystal (AFLC) cells exhibit propagating solitary waves. By measuring the retardation and the apparent tilt angle, we find that the conventional model for the solitary wave propagation in ... -
Some New FIR Laser Lines of Optically Pumped 12CD2C12; Absorption Spectroscopy 12 CH3160H, 12CH3160D, and 12CH31, 12CH3Br, of Water and Acetonitrile
VIJ, JAGDISH KUMAR (IEEE, 1986)No abstract available. -
Spontaneous Periodic Deformations in Nonchiral Planar-Aligned Bimesogens with a Nematic-Nematic Transition and a Negative Elastic Constant
VIJ, JAGDISH KUMAR; PANARIN, YURI PETROVICH (2010)Hydrocarbon linked mesogenic dimers are found to exhibit an additional nematic phase below the conventional uniaxial nematic phase as confirmed by x-ray diffraction. The phase produces unusual periodic stripe domains in ...