A5101751163- Inorganic Fluorides and Related Compounds
- Solid-state spectroscopy and crystallography
- Thermal and Kinetic Analysis
- High-pressure geophysics and materials
- Catalysis and Oxidation Reactions
- Luminescence Properties of Advanced Materials
- Physics of Superconductivity and Magnetism
- Energetic Materials and Combustion
- Crystal Structures and Properties
- Chemical Thermodynamics and Molecular Structure
- Radioactive element chemistry and processing
- Diamond and Carbon-based Materials Research
- Advanced Condensed Matter Physics
- Molecular spectroscopy and chirality
- Laser-induced spectroscopy and plasma
- Magnetic and transport properties of perovskites and related materials
- Inorganic Chemistry and Materials
- Magnetism in coordination complexes
- Superconducting Materials and Applications
- Liquid Crystal Research Advancements
- Crystallography and molecular interactions
- Polyoxometalates: Synthesis and Applications
- Lanthanide and Transition Metal Complexes
- Surfactants and Colloidal Systems
- Laser-Matter Interactions and Applications
Bhabha Atomic Research Centre
1992-2021
Bhabha Atomic Research Center Hospital
2019-2021
University of Mumbai
2019-2021
Brihanmumbai Municipal Corporation
2021
Tata Institute of Fundamental Research
1962-2009
Boston College
1990-1993
McMaster University
1970-1985
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellar chain model for the origin of visoelasticity in dilute surfactant solutionsU. R. K. Rao, C. Manohar, B. S. Valaulikar, and M. IyerCite this: J. Phys. Chem. 1987, 91, 12, 3286–3291Publication Date (Print):June 1, 1987Publication History Published online1 May 2002Published inissue 1 June 1987https://pubs.acs.org/doi/10.1021/j100296a036https://doi.org/10.1021/j100296a036research-articleACS PublicationsRequest reuse permissionsArticle...
C. Manohar, U. R. K. Rao, B. S. Valaulikar and M. Lyer, J. Chem. Soc., Commun., 1986, 379 DOI: 10.1039/C39860000379
Abstract We report X-ray diffraction, density, ultrasonic velocity and refractive index studies in the N(p-n-pentyloxy benzylidene) p-n-alkylaniline compounds, viz. 50.5, 50.6 50.7. The nematic-smectic A (NA) transition is found to be weak first order while it second 50.5 salient features observed are cybotactic clusters nematic phase all molecular tilt which was inferred due end alkyl chains causing orienta-tional disorder (smaller orientational parameters 's' than expected) smectic phase,...
It is shown that the heat of transition phase change II → I at 129° on heating KNO3 dependent thermal history sample, since it involves two steps, viz., II→ III and III→ 2° interval. During cooling, latter step fast truly reversible, though with a temperature hysteresis. The former sluggish both time. Our results indicate can be used for calibration purpose only if material has not been heated beyond 128° in immediately preceding three hours.
By single-crystal X-ray techniques, the phase transition III → I in Na2SO4 has been shown to be topotaxic nature both forward and reverse directions. crystallographic relation between two forms is established.
Abstract Time‐resolved Raman spectroscopy for visualizing molecular fingerprint snapshots at nanosecond time scale is a useful tool detailed understanding of in situ shock behaviour materials. This technique was applied to study the changes vibrations poly (methyl methacrylate) (PMMA) under laser driven compression up ~1.9 GPa confinement geometry. A layered target configuration used enhance pressure. The vibrational modes are measured as function dynamic and static compression. Grüneisen...
Previous 19F N.M.R. studies of liquid BF3 have been extended by obtaining the 11B spectrum and 10BF3 at various temperatures. Values for B-F coupling constant boron relaxation times obtained computer matching visual observed calculated spectra. Relaxation Arrhenius temperature dependence found previously. The is discussed. Some possible advantages ‘high spin spectra’ are
Abstract α 1 ‐Purothionin (α ‐P), a wheatgerm protein and lytic toxin, has secondary tertiary structure similar to that of crambin as revealed by CD NMR studies. ‐P crystallizes in the tetragonal space group I422 with unit cell dimensions: = b 53.59 c 69.79 Å. X‐ray diffraction data have been measured 2.5 Å Bragg spacing. The crystal determined molecular replacement methods, using an energy‐minimized model derived from (Whitlow Teeter: Journal Biomolecular Structure Dynamics 2:831–848, 1985,...
We have carried out Raman spectroscopic measurements on atactic polystyrene (aPS) under shock compression up to 2 GPa. Observed wavenumber shifts of active modes been used determine their Grüneisen parameters and bond anharmonicities. mode at 798 cm −1 displays maximum blue shift 4.95 /GPa. Our observed are found be consistent with the earlier results obtained hydrostatic pressure. also evaluated pressure through 1D radiation hydrodynamic simulations, in good agreement experimental values....
Fluorination of oxides rare earths using ammonium hydrogen fluoride at room temperature gave new compounds [NH 4 ] 3 MF 6 •nH 2 O, where M = Y, La, Nd, and Pr. In the case cerium, CeF 8 is formed. The course thermal decomposition all these studied by thermogravimetry/differential analysis (TG/DTA) X-ray powder diffraction (XRD). Keywords: hexafluoro metallates, earths, fluoride, decomposition, diffraction.
The transient state of excitation and relaxation processes in materials under shock compression can be investigated by coupling the laser driven facility with Raman spectroscopy. For this purpose, a time resolved spectroscopy setup has been developed to monitor physical chemical changes such as phase transitions, reactions, molecular kinetics etc., nanosecond resolution. This system consist mainly three parts, 2 J/8 ns Nd:YAG used for generation pump probe beams, spectrometer temporal...
The microscopic and dynamic response of the atactic polystyrene molecules under shock compression at laser power density 4.9 GW/cm 2 was studied using time‐resolved Raman spectroscopy. pressure estimated in sample GPa, temporal wavenumber resolutions these experiments were 3 ns cm −1 , respectively. shocked showed a blue shift 5 7 for 1004 (C―C―C ring bending mode ν 12 ) 1606 (C―C stretching . changes modes are observed with respect to wave propagation. It is that intensities peaks decrease...
Abstract Electron paramagnetic resonance (E.P.R.) of γ-irradiated polycrystalline (NH4)3VO2F4 has given clear indication the existence trans [VO2F4]4−] species in solid consistent with predictions VSEPR theory. Clear evidence was obtained for occurrence a first order phase transition at 418±3 K large coexistence region (418 to 273 K) below temperature. This is associated motion [VO2F4]3− units which are present fast reorienting form high temperature phase. rigid forms been found be...
R. J. Gillespie and U. K. Rao, Chem. Soc., Commun., 1983, 422 DOI: 10.1039/C39830000422