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Browsing Chandrabhas Narayana by Issue Date

Now showing items 1-20 of 44

Sevenfold Coordinated MgSe: Experimental Internal Atom Position Determination to 146 GPa, Diffraction Studies to 202 GPa, and Theoretical Studies to 500 GPa

Ruoff, A L; Ho, A C; Pai, M F; Luo, H; Greene, R G; Chandrabhas, Narayana; Molstad, J C; Trail, S S; DiSalvo, F J; van Camp, P E (American Physical Society, 1998-09-28)

MgSe has been studied using energy dispersive x-ray diffraction to 202 GPa and local density approximation and ultrasoft pseudopotentials to 500 GPa. MgSe undergoes a "continuous" phase transformation from the rocksalt to ...
A low-cost Raman spectrometer design used to study Raman scattering from a single-walled carbon nanotube

Kavitha, G; Vivek, S R C; Govindaraj, A; Narayana, Chandrabhas (Indian Academy of Sciences, 2003-10)

The paper discusses the design of a low cost Raman spectrometer. Singlewalled nanotubes (SWNT) have been studied to demonstrate the reach of such a system. We observe both the radial-breathing mode (RBM) and the tangential ...
Metal-coated magnetic nanoparticles for surface enhanced Raman scattering studies

Kumar, G V Pavan; Rangarajan, N; Sonia, B; Deepika, P; Rohman, Nashiour; Narayana, Chandrabhas (Indian Academy of Sciences, 2011-04)

We report the optimization and usage of surfactantless, water dispersible Ag and Au-coated gamma-Fe(2)O(3) nanoparticles for applications in surface-enhanced Raman scattering (SERS). These nanoparticles, with plasmonic as ...
The Phonon Percolation Scheme for Alloys: Extension to the Entire Lattice Dynamics and Pressure Dependence

Pradhan, Gopal Krushna; Narayana, Chandrabhas; Rao, Mala Narasappaya; D'Astuto, Matteo; Chaplot, Samrath Lal; Pages, Olivier; Breidi, A; Souhabi, Jihane; Postnikov, Andrei; Deb, Sudip Kumar; Ganguli, Tapas; Polian, Alain; Bhalerao, Gopalkrishna; Shukla, Abhay; Firszt, Franciszek; Paszkowicz, Wojciech (Japan Society of Applied Physics, 2011-05)

We explore two basic issues behind the 1-bond -> 2-mode percolation scheme that has recently lead to a unification of the classification of the Raman and infrared spectra of usual zincblende semiconductor alloys. In doing ...
Spin-Reorientation, Ferroelectricity, and Magnetodielectric Effect in YFe(1-x)Mn(x)O(3)(0.1 <= x <= 0.40)

Mandal, P; Bhadram, Venkata Srinu; Sundarayya, Y; Narayana, Chandrabhas; Sundaresan, A; Rao, C N R (American Physical Society, 2011-09-19)

We report the observation of magnetoelectric and magnetodielectric effects at different temperatures in Mn-substituted yttrium orthoferrite, YFe(1-x)Mn(x)O(3)(0.1 <= x <= 0.40). Substitution of Mn in antiferromagnetic ...
Brillouin Scattering Investigation of Solvation Dynamics in Succinonitrile-Lithium Salt Plastic Crystalline Electrolytes

Das, Supti; Bhadram, Venkata Srinu; Narayana, Chandrabhas; Bhattacharyya, Aninda J (American Chemical Society, 2011-11-03)

Temperature dependent Brillouin scattering studies have been performed to ascertain the influence of solvent dynamics on ion-transport in succinonitrile-lithium salt plastic crystalline electrolytes. Though very rarely ...
Photoluminescence tuning of Na1-xKxNdW2O8 (0.0 <= x <= 0.7) nanoparticles: synthesis, crystal structure and Raman study

Bhat, Swetha S. M.; Huq, Ashfia; Swain, Diptikanta; Narayana, Chandrabhas; Sundaram, Nalini G. (Royal Society of Chemistry, 2014)

A series of Na1-xKxNdW2O8 (0.0 <= x <= 0.7) nanoparticles have been synthesized by an efficient glycothermal technique for the first time. SEM measurements confirmed the particle size ranges from 30-200 nm with ellipsoidal ...
Temperature-induced electron-phonon coupling behaviour of AgGaS2 probed by Brillouin spectroscopy

Kavitha, C.; Narayana, Chandrabhas (Pergamon-Elsevier Science Ltd, 2014)

Low temperature Brillouin scattering studies on Chalcopyrite AgGaS2 have been carried out between the temperatures ranges 20-300 K. We observe the Brillouin modes for AgGaS2 as follows: for crossed polarization (VH) the ...
Thermally Stable Plasmonic Nanocermets Grown on Microengineered Surfaces as Versatile Surface Enhanced Raman Spectroscopy Sensors for Multianalyte Detection

Gupta, Nitant; Gupta, Disha; Aggarwal, Shantanu; Siddhanta, Soumik; Narayana, Chandrabhas; Barshilia, Harish C. (American Chemical Society, 2014)

Noble metal nanoparticle-based plasmonic sensors, fabricated by top-down and colloidal routes, are widely used for high sensitivity detection of diverse analyte molecules using surface enhanced Raman spectroscopy (SERS). ...
Polymorphism in Photoluminescent KNdW2O8: Synthesis, Neutron Diffraction, and Raman Study

Bhat, Swetha S. M.; Swain, Diptikanta; Narayana, Chandrabhas; Feygenson, Mikhail; Neuefeind, Joerg C.; Sundaram, Nalini G. (American Chemical Society, 2014)

Polymorphs of KNdW2O8 (alpha-KNdW2O8 and beta-KNdW2O8) phosphors were synthesized by an efficient solution combustion technique for the first time. The crystal structure of the polymorphs analyzed from Rietveld refinement ...
Effect of pressure on octahedral distortions in RCrO3 (R=Lu, Tb, Gd, Eu, Sm): the role of R-ion size and its implications

Bhadram, Venkata Srinu; Swain, Diptikanta; Dhanya, R.; Polentarutti, Maurizio; Sundaresan, A.; Narayana, Chandrabhas (IoP Publishing Ltd, 2014)

The effect of rare-earth ion size on the octahedral distortions in rare-earth chromites (RCrO3, R = Lu, Tb, Gd, Eu, Sm) crystallizing in the orthorhombic structure has been studied using Raman scattering and synchrotron ...
Pressure-induced structural changes and insulator-metal transition in layered bismuth triiodide, BiI3: a combined experimental and theoretical study

Devidas, T. R.; Shekar, N. V. Chandra; Sundar, C. S.; Chithaiah, P.; Sorb, Y. A.; Bhadram, V. S.; Chandrabhas, Narayana; Pal, K.; Waghmare, Umesh V.; Rao, C. N. R. (IoP Publishing Ltd, 2014)

Noting that BiI3 and the well-known topological insulator (TI) Bi2Se3 have the same high symmetry parent structures, and that it is desirable to find a wide-band gap TI, we determine here the effects of pressure on the ...
Conformational change in a urea catalyst induced by sodium cation and its effect on enantioselectivity of a Friedel-Crafts reaction

Chittoory, Arjun K.; Kumari, Gayatri; Mohapatra, Sudip; Kundu, Partha P.; Maji, Tapas K.; Narayana, Chandrabhas; Rajaram, Sridhar (Pergamon-Elsevier Science Ltd, 2014)

While developing bis-camphorsulfonyl urea as a hydrogen-bonding catalysts, we discovered that the native conformation of the catalyst is unsuitable for inducing enantioselectivity. By complexing the catalyst with weakly ...
Nanocrystalline Ag microflowers as a versatile SERS platform

Mettela, Gangaiah; Siddhanta, Soumik; Narayana, Chandrabhas; Kulkarni, G. U. (Royal Society of Chemistry, 2014)

In this paper, the synthesis of Ag microflowers for use as manipulable and reusable substrates in surface enhanced Raman spectroscopy (SERS) is demonstrated, working with ultra-low volumes of the analyte. Flower-like AgBr ...
Low cost, rapid synthesis of graphene on Ni: An efficient barrier for corrosion and thermal oxidation

Mogera, Umesha; Kurra, Narendra; Radhakrishnan, Dhanya; Narayana, Chandrabhas; Kulkarni, G. U. (Pergamon-Elsevier Science Ltd, 2014)

Graphene because of its inert and impermeable nature holds a great promise as a protective coating against corrosion and oxidation. It is envisioned that graphene coated metals will be increasingly used in metal and ...
SERS and MD simulation studies of a kinase inhibitor demonstrate the emergence of a potential drug discovery tool

Karthigeyan, Dhanasekaran; Siddhanta, Soumik; Kishore, Annavarapu Hari; Perumal, Sathya S. R. R.; Agren, Hans; Sudevan, Surabhi; Bhat, Akshay V.; Balasubramanyam, Karanam; Subbegowda, Rangappa Kanchugarakoppal; Kundu, Tapas Kumar; Narayana, Chandrabhas (National Academy of Sciences, 2014)

We demonstrate the use of surface-enhanced Raman spectroscopy (SERS) as an excellent tool for identifying the binding site of small molecules on a therapeutically important protein. As an example, we show the specific ...
Naphthoquinone-mediated Inhibition of Lysine Acetyltransferase KAT3B/p300, Basis for Non-toxic Inhibitor Synthesis

Vasudevarao, Mohankrishna Dalvoy; Mizar, Pushpak; Kumari, Sujata; Mandal, Somnath; Siddhanta, Soumik; Swamy, Mahadeva M. M.; Kaypee, Stephanie; Kodihalli, Ravindra C.; Banerjee, Amrita; Naryana, Chandrabhas; Dasgupta, Dipak; Kundu, Tapas Kumar (American Society Biochemistry Molecular Biology Inc, 2014)

Background: 1,4-Naphthoquinone analogs, such as plumbagin, are toxic compounds due to their redox cycling and thiol-reactive properties. Results: The p300 inhibitor PTK1, a plumbagin derivative with greatly reduced toxicity, ...
Tunable optical properties of graphene oxide by tailoring the oxygen functionalities using infrared irradiation

Maiti, R.; Midya, A.; Narayana, Chandrabhas; Ray, S. K. (IoP Publishing Ltd, 2014)

The modification of individual oxygen functional groups and the resultant optical properties of a graphene oxide suspension were investigated using a controlled photothermal reduction by infrared irradiation. The evolution ...
Octahedral distortion induced magnetic anomalies in LaMn0.5Co0.5O3 single crystals

Manna, Kaustuv; Bhadram, Venkata Srinu; Elizabeth, Suja; Narayana, Chandrabhas; Kumar, P. S. Anil (American Institute of Physics, 2014)

Single crystals of LaMn0.5Co0.5O3 belonging to the ferromagnetic-insulator and distorted perovskite class were grown using a four-mirror optical float zone furnace. The as-grown crystal crystallizes into an orthorhombic ...
Allosteric Transition Induced by Mg2+ Ion in a Transactivator Monitored by SERS

Kundu, Partha P.; Bhowmick, Tuhin; Swapna, Ganduri; Kumar, G. V. Pavan; Nagaraja, V.; Narayana, Chandrabhas (American Chemical Society, 2014)

We demonstrate the utility of the surface-enhanced Raman spectroscopy (SERS) to monitor conformational transitions in protein upon ligand binding. The changes in protein's secondary and tertiary structures were monitored ...

Now showing items 1-20 of 44

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