Defense Research and Development Organization DRDO

Jagdalpur, India

Defense Research and Development Organization DRDO

Jagdalpur, India

Time filter

Source Type

Pal D.B.,Indian Institute of Technology BHU Varanasi | Kumar H.,Defense Research and Development Organization DRDO | Giri D.D.,Indian Institute of Technology BHU Varanasi | Singh P.,Indian Institute of Technology BHU Varanasi | Mishra P.K.,Indian Institute of Technology BHU Varanasi
Advanced Science Letters | Year: 2014

Composite nanofibers of Cu/CeO2 were electrospunned using Cu(CH3COO–)2H2O and Ce(NO3)3 ·6H2O precursors, polyvinyl pyrrolidone fiber template and co-solvent mixture by volume 2:1 of C2H5OH/H2O followed by thermal treatment (500 °C, 3 h). The fabricated nanofibers were characterized by SEM, XRD, BET and FTIR for morphologies, structures, surface area and functional group, respectively. We observed continuous line feature in calcined composite nanofibers with an average diameter of 127 nm and CeO2 peaks were observed at 28.74°. © 2014 American Scientific Publishers All rights reserved.


Pal D.B.,Indian Institute of Technology BHU Varanasi | Kumar H.,Defense Research and Development Organization DRDO | Giri D.D.,Indian Institute of Technology BHU Varanasi | Singh P.,Indian Institute of Technology BHU Varanasi | Mishra P.K.,Indian Institute of Technology BHU Varanasi
Advanced Science Letters | Year: 2016

The CuO/CeO2nanofibers were prepared by electrospinning of raw material, precursor Ce(NO3)3·6H2O and spinnable additive polyvinyl pyrrolidone (PVP). The diameter of nanofibers ranged between 40 to 100 nm depending upon PVP concentration. In comparison to pure CeO2nanofibers, equistoichiometric ratio of cerium nitrate and copper acetate monohydrate mixed solution resulted in thinner fibers and superior catalytic activity in water gas shift reaction (WGSR). In this case CO conversion improved by 7% and reached to 72% in temperatures range 310 °C to 360 °C, signifying its potential application in water gas shift reaction. © 2016 American Scientific Publishers. All rights reserved.


Krushnamurty K.,Indian Institute of Technology Hyderabad | Srikanth I.,Defense Research and Development Organization DRDO | Rangababu B.,Defense Research and Development Organization DRDO | Majee S.K.,Defense Research and Development Organization DRDO | And 2 more authors.
Advanced Materials Letters | Year: 2015

Organically modified montimorillonite nanoclay was added to the epoxy and E-glass-epoxy composites. The influence of nanoclay content (varied between 0 to 5wt %) on the relative crosslink density and the fracture toughness of the epoxy matrix was studied. Differential scanning calorimetry (DSC) indicated that the amino functional groups present on the nanoclay react with the epoxy matrix to increase the crosslink density of about 13 and 18% at 3 and 5wt% addition, respectively. The toughness of the epoxy composites increased by 25% at 3wt% addition of nanoclay, whereas, it decreases at 5wt%. Flexural strength and tensile strength of the E-glass-epoxy composites were found to increase by 12% and 11% respectively at 3wt% addition of nanoclay, while at 5wt% addition these properties decreased due to the matrix embrittlement. Interestingly matrix embrittlement is found to be beneficial in increasing the impact resistance due to spallation of embrittled matrix that ensures the dissipation of the impact energy. 5wt% nanoclay addition increases the impact strength by 29% and reduces the back face bulge of composite by 31%. These results may lead to the design and realization of glass-epoxy composites with better impact strength. © 2015 VBRI Press.

Loading Defense Research and Development Organization DRDO collaborators
Loading Defense Research and Development Organization DRDO collaborators