Browsing School of Engineering by Author "VIJ, JAGDISH"
Now showing items 41-58 of 58
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Molecular orientational properties of a high-tilt chiral smectic liquid crystal determined from its infrared dichroism
VIJ, JAGDISH (2007)The orientational characterisitics and the temperature dependencies of the molecular apparent tilt angle of a partly fluorinated chiral smectic liquid crystal (/S/)-4-(1-methylheptyloxycarbonyl)phenyl 4-[6-(3,4,4,4-tetra ... -
Optical confirmation of biaxial nematic (Nb) phase in a bent-core mesogen
VIJ, JAGDISH; PANOV, VITALI (2009)A bent-core mesogen with different end groups has been studied for different surface conditions in both planar and homeotropic cells using techniques for measuring biaxiality and optical switching. Biaxial nematic phase ... -
Optical rotatory power, biaxiality and the models of the chiral tilted smectic phases
VIJ, JAGDISH; PANOV, VITALI (2003)Among the chiral tilted smectics, the stable existence has been confirmed in numerous investigations of SmCA*, ~antiferroelectric smectic-CA) SmCF11* (SmCg*), SmCF12* ~antiferroelectric, AF! and SmC* phases. The structures ... -
Orientation polarization from faster motions in the ultraviscous and glassy diethyl phthalate and its entropy
VIJ, JAGDISH (2006)Dielectric spectra of the relaxation in glassy and ultraviscous liquid diethyl phthalate show that its relaxation strength , the distribution of times, and the relaxation rate are more sensitive to temperature T in the ... -
The orientational order and the dynamics of the dendritic liquid crystal organo-siloxane tetrapodes determined using dielectric spectroscopy
VIJ, JAGDISH (2006)The dielectric measurements have been carried out on the two zeroth generation dendrimers with four branched arms (called tetrapodes) based on the siloxane cores. The results are analyzed in the framework of the molecular ... -
Orientational order of a ferroelectric liquid crystal with small layer contraction
PANOV, VITALI; FUKUDA, ATSUO; VIJ, JAGDISH (2010)We present spectroscopic and optical studies of a non-layer-shrinkage ferroelectric liquid crystal DSiKN65. The orientational order parameters S, measured with respect to the smectic layer normal using IR spectroscopy on ... -
Propagation of an electromagnetic wave in an absorbing anisotropic medium and infrared transmission of liquid crystals: Comparison with experiments
VIJ, JAGDISH (2009)The theory of the absorbance of a semi-infinite medium characterized by a second-rank dielectric tensor for the entire electromagnetic spectrum, as given by Scaife and Vij [J. Chem. Phys. 122, 174901 (2005)], is extended ... -
Propagation of an electromagnetic wave in an absorbing anisotropic medium and infrared transmission spectroscopy of liquid crystals
VIJ, JAGDISH (2005)The theory of absorbance is developed for the entire electromagnetic spectrum of radiation in a semi-infinite anisotropic medium with a second rank dielectric tensor, the elements of which are complex and frequency dependent. ... -
Relaxations and nano-phase-separation in ultraviscous heptanol-alkyl halide mixture
VIJ, JAGDISH (2007)To gain insight into the effects of liquid-liquid phase separation on molecular relaxation behavior we have studied an apparently homogeneous mixture of 5-methyl-2-hexanol and isoamylbromide by dielectric spectroscopy over ... -
Short-range correlations seen in the nematic phase of bent-core liquid crystals by dielectric and electro-optic studies
VIJ, JAGDISH; JANG, YUN; PANOV, VITALI; KOCOT, ANTONI (2011)Three bent-core nematic liquid crystals having the same core but with different terminal groups, short (C4) and long (C7,C9) tails, are investigated by dielectric and electro-optic contrast spectroscopic techniques. C4 ... -
Sign reversal in the dielectric anisotropy as functions of temperature and frequency in the nematic phase of a bent-core mesogen
VIJ, JAGDISH; JANG, YUN; PANOV, VITALI (2010)The sign reversal in the dielectricanisotropy(???????) from positive to negative is observed for 4-cyanoresorcinol bisbenzoate system with temperature and frequency in the nematic phase of a bent-core system as the temperature ... -
Solitary wave propagation in surface stabilized ferroelectric liquid crystal cells
VIJ, JAGDISH; SONG, JANG-KUN (2008)Solitary wave propagation in surface stabilized ferroelectric liquid crystal cells controlled by surface anchoring of the alignment layers is investigated for different conditions of alignment on the two opposite surfaces. ... -
Superlattice structures observed in the extraordinary phase sequence and analyzed by the phenomenological Landau model and the partially molecular model.
FUKUDA, ATSUO; VIJ, JAGDISH (2013)We draw several electric-field-temperature (E-T) phase diagrams with electric-field-induced birefringence contours in the nOHFBBB1M7 (n=10) and nOTBBB1M7 (n=11) (C11) mixture system by changing the C11 concentration ... -
Surface molecular alignment by in-plane anchoring in the cell showing the. V-shaped switching
VIJ, JAGDISH; FUKUDA, ATSUO (2001)The surface molecular alignment in a sandwich cell showing V-shaped switching has been investigated using a photocontrolling method. The results indicate that the molecules on the rubbed surface are aligned parallel to ... -
Theory of the intermediate tilted smectic phases and their helical rotation
VIJ, JAGDISH; FUKUDA, ATSUO (2006)A molecular-statistical theory for the entire sequence of the chiral tilted smectic phases is derived. Uniaxial and biaxial subphases were found to be stable in different temperature ranges depending on the molecular parameters. ... -
Thermotropic Biaxial Nematic Phase in Liquid Crystalline Organo-Siloxane Tetrapodes
VIJ, JAGDISH (2004)Infrared absorbance measurements have been carried out on two liquid crystalline organo-siloxane tetrapodes. Results unambiguously show the existence of a biaxial nematic phase below a uniaxial nematic phase. The three ... -
V-shaped electro-optic response observed in a chiral ferroelectric smectic liquid crystal
VIJ, JAGDISH; PANARIN, YURI; SONG, JANG-KUN (2008)We report on the observation of V-shaped switching in a ferroelectric liquid crystal cell over a wide range of temperatures. Results of the optical transmittance in the visible region give us the helical pitch for various ... -
X-ray diffraction study of ferroelectric and antiferroelectric liquid crystal mixtures exhibiting de Vries SmA∗-SmC∗ transitions
VIJ, JAGDISH; MANNA, UTTAM; FUKUDA, ATSUO (2010)In this Rapid Communication, results on smectic layer thickness, using synchrotron radiation x-ray diffraction, for different mixtures of ferroelectric and antiferroelectric liquid crystals are given. We find that with ...