- Soft Condensed Matter Physics, Liquid Crystals, Self-Organization, Hydrophobic Interactions, Electron Density, Polarity of Ionic Liquids, and 7 morestatic dielectric constant of ILs, Langmuir Blodgett Multilayers, Alokmoy Dutta Sinp, Dissolving Salts Langmuir Film, Langmuir Monolayer, Isotropic-nematic Phase Transitions, and Entropic Forceedit
Research Interests:
Research Interests:
The effect of endocytosis of gold nanoparticles (AuNPs) on photoacoustic (PA) signal is examined using computer simulations. It assumes that the endocytosed AuNPs significantly enhance cellular optical absorption but do not alter... more
The effect of endocytosis of gold nanoparticles (AuNPs) on photoacoustic (PA) signal is examined using computer simulations. It assumes that the endocytosed AuNPs significantly enhance cellular optical absorption but do not alter thermophysical parameters. The PA signals were computed employing a theoretical model at various cell and intracellular NP concentrations for 532 nm illumination. It was found that the PA amplitude increased linearly in both the cases. The simulation results, when the contributions from both coherent and incoherent components are included, demonstrate good agreement with published experimental results.
Research Interests:
The robust complex [La(1,10-phen)2(NO3)3] (1,10-phen=1,10-phenanthroline) exhibits thermally induced single crystal to single crystal transformation from one polymorphic phase to another. The complex crystallizes in monoclinic C2/c space... more
The robust complex [La(1,10-phen)2(NO3)3] (1,10-phen=1,10-phenanthroline) exhibits thermally induced single crystal to single crystal transformation from one polymorphic phase to another. The complex crystallizes in monoclinic C2/c space group with C2 molecular symmetry at 293K while at 100K it shows P21/c space group with C1 molecular symmetry. Supramolecular investigation shows that at 100K the complex forms 2D achiral sheets whereas at 293K forms two different homochiral 2D sheets. Low temperature DSC analysis indicates that this structural transformation occurs at 246K and also this transformation is reversible in nature. We have shown that thermally induced coherent movement of ligands changes the molecular symmetry of the complex and leads to polymorphism. Photoluminescence property of complex has been studied in both solid state and in methanolic solution at room temperature. The effect of the presence low-lying LUMO orbital of π-character in the complex is elucidated by theo...
Research Interests: Analytical Chemistry, Photochemistry, Fluorescence, Crystallization, Macromolecular X-Ray Crystallography, and 10 moreDifferential scanning calorimetry, Nitrates, Three Dimensional Imaging, Luminescence, Phase transition, Hydrogen Bonding, Molecular Conformation, Normal Distribution, Ligands, and *Hot Temperature
Research Interests:
The work deals with synthesis of nano-crystalline materials in open-air laboratory and in-depth investigation of the tobacco sample of one branded cigarette and its ash using high-resolution transmission electron microscopy and associated... more
The work deals with synthesis of nano-crystalline materials in open-air laboratory and in-depth investigation of the tobacco sample of one branded cigarette and its ash using high-resolution transmission electron microscopy and associated techniques. It exhibits the presence of nanocrystals and nanorods of various oxides in cigarette ash. The structure, shape, size and composition of these nanocrystals and nanorods are explored. The energy dispersive X-ray spectra from different regions of the tobacco sample and its ash using high-angle annular dark field scanning/transmission electron microscopy mode are utilized to obtain elemental composition and their relative abundances. For a detailed distribution of different elements in the nanorods, elemental mapping using energy-filtered transmission electron microscopy is also presented. The results highlight the conversion of amorphous constituents of tobacco to nanomaterials on combustion at low temperatures, thus mixing up in the atmosphere.
Research Interests:
Research Interests:
Research Interests:
Abstract. A theoretical model investigating the dependence of optoacoustic (OA) signal on blood oxygen saturation (SO 2) is discussed. The derivations for the nonbandlimited and bandlimited OA signals from many red blood cells (RBCs) are... more
Abstract. A theoretical model investigating the dependence of optoacoustic (OA) signal on blood oxygen saturation (SO 2) is discussed. The derivations for the nonbandlimited and bandlimited OA signals from many red blood cells (RBCs) are presented. The OA field generated by many RBCs was obtained by summing the OA field emitted by each RBC approximated as a fluid sphere. A Monte Carlo technique was employed generating the spatial organizations of RBCs in two-dimensional. The RBCs were assumed to have the ...
Research Interests:
Convex Arrhenius behaviour, rare in transitions between equilibrium phases of pure systems, is observed in the plot of heating rate vs. temperature for Nematic-Isotropic (N-I) transition of liquid crystalline MBBA through Differential... more
Convex Arrhenius behaviour, rare in transitions between equilibrium phases of pure systems, is observed in the plot of heating rate vs. temperature for Nematic-Isotropic (N-I) transition of liquid crystalline MBBA through Differential Scanning Calorimetry (DSC). The plot is best fit by a monomolecular growth function, using which an entropy-driven activation barrier, increasing non-linearly with temperature, is obtained. Fourier Transform Infrared (FTIR) studies of MBBA around the N-I transition temperature (Tc) show increase in out-of-plane benzene ring distortions and decrease in order along the C=N-C axis, consistent with DSC results of
conformational entropy-driven barrier.
conformational entropy-driven barrier.