Faculty Publications (ICMS): Recent submissions

Now showing items 21-40 of 71

Enhancement in creep resistance of Ti-6Al-4V alloy due to boron addition

Singh, Gaurav; Satyanarayana, D. V. V.; Pederson, Robert; Datta, Ranjan; Ramamurty, Upadrasta (Elsevier Science Sa, 2014)

The addition of B, up to about 0.1 wt%, to Ti-6Al-4V (Ti64) reduces its as-cast grain and colony sizes by an order of magnitude. In this paper, the creep resistance of this alloy modified with 0.06 and 0.11 wt% B additions ...
Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Shen, Liming; Althammer, Matthias; Pachauri, Neha; Loukya, B.; Datta, Ranjan; Iliev, Milko; Bao, Ningzhong; Gupta, Arunava (Elsevier Science Bv, 2014)

The direct liquid injection chemical vapor deposition (DLI-CVD) technique has been used for the growth of cobalt ferrite (CFO) films on (100) oriented MgAl2O4 (MAO) substrates. Smooth and highly epitaxial cobalt ferrite ...
Epitaxial Co metal thin film grown by pulsed laser deposition using oxide target

Negi, D. S.; Roy, A.; Loukya, B.; Dileep, K.; Shetty, S.; Kumar, N.; Kumar, P. S. Anil; Datta, Ranjan (Elsevier Science Bv, 2014)

We report here the growth of epitaxial Co metal thin film on c-plane sapphire by pulsed laser deposition (RD) using Co:ZnO target utilizing the composition inhomogeneity of the corresponding plasma. Two distinct plasma ...
Dynamical facilitation governs glassy dynamics in suspensions of colloidal ellipsoids

Mishra, Chandan K.; Nagamanasa, K. Hima; Ganapathy, Rajesh; Sood, A. K.; Gokhale, Shreyas (National Academy of Sciences, 2014)

One of the greatest challenges in contemporary condensed matter physics is to ascertain whether the formation of glasses from liquids is fundamentally thermodynamic or dynamic in origin. Although the thermodynamic paradigm ...
Experimental signatures of a nonequilibrium phase transition governing the yielding of a soft glass

Nagamanasa, K. Hima; Gokhale, Shreyas; Sood, A. K.; Ganapathy, Rajesh (American Physical Society, 2014)

We present direct experimental signatures of a nonequilibrium phase transition associated with the yield point of a prototypical soft solid-a binary colloidal glass. By simultaneously quantifying single-particle dynamics ...
Growing dynamical facilitation on approaching the random pinning colloidal glass transition

Gokhale, Shreyas; Nagamanasa, K. Hima; Ganapathy, Rajesh; Sood, A. K. (Nature Publishing Group, 2014)

Despite decades of research, it remains to be established whether the transformation of a liquid into a glass is fundamentally thermodynamic or dynamic in origin. Although observations of growing length scales are consistent ...
Activation of Benzyl Aryl Carbonates: The Role of Cation-pi Interactions

Reddy, Golipalli Ramana; Avadhani, Anusha S.; Rajaram, Sridhar (American Chemical Society, 2016)

Benzyl aryl carbonates can react with a nucleophile to yield an activated electrophile and an aryloxide anion. Previously, we had utilized this in the synthesis of alpha-nitro esters from nitroalkanes. To further understand ...
Structural characterization of epitaxial LiFe5O8 thin films grown by chemical vapor deposition

Loukya, B.; Negi, D. S.; Sahu, R.; Pachauri, N.; Gupta, A.; Datta, Ranjan (Elsevier Science Sa, 2016)

We report on detailed microstructural and atomic ordering characterization by transmission electron microscopy in epitaxial LiFe5O8 (LFO) thin films grown by chemical vapor deposition (CVD) on MgO (001) substrates. The ...
Stable p-type conductivity in B and N co-doped ZnO epitaxial thin film

Sahu, Rajib; Gholap, Hari Bhau; Mounika, Gandi; Dileep, Krishnan; Vishal, Badri; Ghara, Somnath; Datta, Ranjan (Wiley-V C H Verlag Gmbh, 2016)

We report on the observation of stable p-type conductivity in B and N co-doped epitaxial ZnO thin films grown by pulsed laser deposition. Films grown at higher oxygen partial pressure (similar to 10(-1) Torr) shows p-type ...
Pd-Pt alloys nanowires as support-less electrocatalyst with high synergistic enhancement in efficiency for methanol oxidation in acidic medium

Rana, Moumita; Patil, Pramod K.; Chhetri, Manjeet; Dileep, K.; Datta, Ranjan; Gautam, Ujjal K. (Academic Press Inc Elsevier Science, 2016)

In a facile approach, Pd73Pt27 alloy nanowires (NWs) with large aspect ratios were synthesized in high yield by using sacrificial templates. Unlike majority of processes, our synthesis was carried out in aqueous solution ...
Layer specific optical band gap measurement at nanoscale in MoS2 and ReS2 van der Waals compounds by high resolution electron energy loss spectroscopy

Dileep, K.; Sahu, R.; Sarkar, Sumanta; Peter, Sebastian C.; Datta, Ranjan (American Institute Physics, 2016)

Layer specific direct measurement of optical band gaps of two important van der Waals compounds, MoS2 and ReS2, is performed at nanoscale by high resolution electron energy loss spectroscopy. For monolayer MoS2, the twin ...
A micrometre-sized heat engine operating between bacterial reservoirs

Krishnamurthy, Sudeesh; Ghosh, Subho; Chatterji, Dipankar; Ganapathy, Rajesh; Sood, A. K. (Nature Publishing Group, 2016)

Artificial microscale heat engines are prototypical models to explore the mechanisms of energy transduction in a fluctuation-dominated regime(1,2). The heat engines realized so far on this scale have operated between thermal ...
Mechanical properties of C-60 thin films at the air-water interface

Santhosh, V.; Voggu, R.; Chaturbedy, P.; Ganapathy, Rajesh; Rao, C. N. R. (Pergamon-Elsevier Science Ltd, 2016)

Understanding the mechanical properties of ultra-thin films formed by the self-assembly of molecules/nanoparticles/colloids at fluid-fluid interfaces is central to many technological applications. Here, we have carried out ...
Deconstructing the glass transition through critical experiments on colloids

Gokhale, Shreyas; Sood, A. K.; Ganapathy, Rajesh (Taylor & Francis Ltd, 2016)

The glass transition is the most enduring grand-challenge problem in contemporary condensed matter physics. Here, we review the contribution of colloid experiments to our understanding of this problem. First, we briefly ...
Site-specific colloidal crystal nucleation by template-enhanced particle transport

Mishra, Chandan K.; Sood, A. K.; Ganapathy, Rajesh (National Academy Sciences, 2016)

The monomer surface mobility is the single most important parameter that decides the nucleation density and morphology of islands during thin-film growth. During template-assisted surface growth in particular, low surface ...
Localized Excitations and the Morphology of Cooperatively Rearranging Regions in a Colloidal Glass-Forming Liquid

Gokhale, Shreyas; Ganapathy, Rajesh; Nagamanasa, K. Hima; Sood, A. K. (American Physical Society, 2016)

We develop a scheme based on a real space microscopic analysis of particle dynamics to ascertain the relevance of dynamical facilitation as a mechanism of structural relaxation in glass-forming liquids. By analyzing the ...
Influence of an amorphous wall on the distribution of localized excitations in a colloidal glass-forming liquid

Gokhale, Shreyas; Nagamanasa, K. Hima; Sood, A. K.; Ganapathy, Rajesh (IoP Publishing Ltd, 2016)

Elucidating the nature of the glass transition has been the holy grail of condensed matter physics and statistical mechanics for several decades. A phenomenological aspect that makes glass formation a conceptually formidable ...
Exchange bias at low fields exhibited by the interface between epitaxial layers of ferromagnetic and charge-ordered rare-earth manganites

Saha, Rana; Vasu, K.; Negi, D. S.; Datta, Ranjan; Sundaresan, A.; Rao, C. N. R. (Wiley-V C H Verlag Gmbh, 2016)

Epitaxial thin films of ferromagnetic La0.7Sr0.3MnO3 (LSMO) and charge-ordered, antiferromagnetic Y0.5Ca0.5MnO3 (YCMO) were deposited on SrTiO3 (100) substrates by pulsed laser deposition (PLD). The heterostructure undergoes ...
Interferroelectric transition as another manifestation of intrinsic size effect in ferroelectrics

Narayan, Bastola; Sorb, Y. A.; Loukya, B.; Samanta, Atanu; Senyshyn, Anatoliy; Ranjan Datta; Singh, Abhishek Kumar; Narayana, Chandrabhas; Ranjan, Rajeev (American Physical Society, 2016)

In general, crystallite size reduction is known to suppress the ferroic order (polarization or magnetization) in ferroelectric and magnetic systems. Using free particles of a giant tetragonality (c/a-1 = 0.18) ferroelectric ...
Epitaxy, phase separation and band-edge emission of spontaneously formed InGaN nanorods

De, Arpan; Shivaprasad, S. M. (IoP Publishing Ltd, 2016)

An In-flux dependent study of the nature of epitaxy, compositional phase separation and band-edge emission of spontaneously formed c-oriented InGaN nanorods on c-sapphire is performed. At higher In flux-rates, m-faceted ...

Now showing items 21-40 of 71

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