D. Selvakumar
Defence Research and Development Organisation
BioassayNanorodNuclear chemistryNanocrystalline materialNanoparticleHydrothermal circulationCatalysisInorganic chemistryChemistryMaterials scienceIndium(III) oxideSinteringChitosanOxideBialaphosBET theoryIndium tin oxideChemical engineeringPlatinumIndium
16Publications
5H-index
174Citations
Publications 16
Newest
Abstract Amongst the natural polymers, chitin is the second most abundant, present mainly in fungi and exoskeleton of crustaceans. It forms a major part of the seafood waste as compiled and presented in this review and is de-acetylated to produce chitosan. Structure and properties of chitosan have been described. Biocompatible and biodegradable characteristics of chitosan have been well studied. In addition to the environmental sustainability associated with its use, the malleability of chitosan...
110 CitationsSource
#1Pramila PatilH-Index: 9
#2Umesh T. Nakate (CBNU: Chonbuk National University)H-Index: 15
Last. N.S. KumarH-Index: 5
view all 7 authors...
Abstract Coating procedure for ceramic monoliths was optimized by wash coating with ϒ-alumina for the deposition of Au sensitized La–CeO2 catalyst. Effect of four different catalyst coating methods on ceramics monolith surface for toluene catalytic activity was investigated. Au sensitized La–CeO2 catalyst was prepared via wetness impregnation and co-precipitation chemical methods. The catalyst was characterized using XRD, FESEM, EDS, TEM, XPS, Raman, BET and Elemental mapping techniques. Nanopar...
5 CitationsSource
#1Prasanna S. BakshiH-Index: 2
#2D. SelvakumarH-Index: 5
Last. N.S. KumarH-Index: 5
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Abstract N-selective derivatives of chitosan (CH) namely, N-methyl chitosan (NMC), trimethyl chitosan (TMC), diethyl methyl chitosan (DEMC) and carboxymethyl chitosan (CMC) were synthesized to study the effects of alkylation on antimicrobial property and biocompatibility. The derivatives were characterized by FT-IR confirming O-free alkyl substitution. XRD studies showed reduction in crystallinity and zeta potential measurement proved the increase in positive charges upon alkylation. Antimicrobi...
15 CitationsSource
#1Rini Grace (DRDO: Defence Research and Development Organisation)
#2Keerthana Sundar (DRDO: Defence Research and Development Organisation)
Last. N. S. Kumar (DRDO: Defence Research and Development Organisation)H-Index: 1
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A facile and sensitive enzyme based electrochemical transducer has been fabricated for the detection of organophosporus compounds. The enzyme, acetylcholinesterase, was covalently immobilized on gold nanoparticles deposited electrochemically over screen printed carbon working electrode. The electrodes were characterized by scanning electron microscopy, atomic force microscopy and electrochemical methods. The enzyme-substrate reactions and sensing studies were carried out at room temperature by c...
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#1D. Selvakumar (DRDO: Defence Research and Development Organisation)H-Index: 5
#2P. Rajeshkumar (DRDO: Defence Research and Development Organisation)H-Index: 1
Last. N.S. Kumar (DRDO: Defence Research and Development Organisation)H-Index: 5
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Abstract Gas sensors were fabricated using nanostructured indium oxide (In 2 O 3 ) and platinum doped indium oxide (Pt-In 2 O 3 ) prepared by surfactant assisted hydrothermal method. The optimum working temperature of the sensors was around 165 °C, which is lower than the literature reports. The sensor fabricated using Pt-In 2 O 3 exhibited higher response as compared to undopedIn 2 O 3 .Their gas sensing properties investigated with NO 2 gaswith2.5 and 5 ppmrevealed that the sensors showed a co...
5 CitationsSource
#1Pramila Patil (DRDO: Defence Research and Development Organisation)H-Index: 9
#2D. Selvakumar (DRDO: Defence Research and Development Organisation)H-Index: 5
Last. N.S. Kumar (DRDO: Defence Research and Development Organisation)H-Index: 5
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Abstract Ceria-Lanthana solid solution (CLSS) demonstrates excellent catalytic activity due to its redox behaviour and bulk oxygen mobility. The present work deals with the size controlled preparation of CLSS by modified co-precipitation method. The formation of oxides was confirmed by TGA and FTIR studies. The oxides of CLSS were sintered at 500, 600, 700, 800 and 900 °C and characterised using SEM, EDAX, XRD, BET surface area analyser and UV-Visible spectrophotometer to ascertain the optimal s...
4 CitationsSource
#1D. Selvakumar (Bharathiar University)H-Index: 5
#2Nallasamy Dharmaraj (Bharathiar University)H-Index: 28
Last. V.C. Padaki (DRDO: Defence Research and Development Organisation)H-Index: 2
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Indium oxide (In2O3) and platinum doped (in situ method) indium oxide (Pt-In2O3) nanoparticles were prepared by surfactant assisted hydrothermal route followed by calcination at 400°C. The X-ray diffraction data revealed that the average size of the nanoparticles was around 15 nm and the transmission electron microscopic investigation showed that the nanoparticles were formed as short nanorods. The oxygen sensing ability of the sensors fabricated using both undoped and Pt-doped In2O3 was found t...
6 CitationsSource
#1D. Selvakumar (Bharathiar University)H-Index: 5
#2Nallasamy Dharmaraj (Bharathiar University)H-Index: 28
Last. V.C. PadakiH-Index: 2
view all 5 authors...
Abstract Indium(III) hydroxide (In(OH)3) powders prepared via Triton X-100 mediated hydrothermal method was sintered at different temperatures (400, 500 and 600 °C) to yield indium(III) oxide nanoparticles (In2O3 NPs). Thermal studies of In(OH)3 confirmed complete conversion to In2O3 around 400 °C. Powder X-ray diffraction (XRD) pattern of sintered In2O3 nanoparticles revealed the formation of phase pure cubic In2O3. The crystallite size of In2O3 NPs was increased from 12 to 26 nm upon increasin...
13 CitationsSource
#1D. Selvakumar (Bharathiar University)H-Index: 5
#2N. Dharmaraj (Bharathiar University)H-Index: 1
Last. V.C. PadakiH-Index: 2
view all 4 authors...
First report on the preparation of well-dispersed, indium(III) oxide (In2O3) nanoparticles with 22–35 nm size by polymer thermolysis is presented. Indium–poly(vinyl alcohol) (PVA) coordination polymer films were prepared by ‘solution casting technique’ from the homogeneous aqueous solution of coordination polymer prepared using PVA and indium(III) nitrate as starting materials; subsequently the films were calcined at 550 °C to yield In2O3 nanoparticles. Both indium–PVA coordination polymer that ...
1 CitationsSource
Pesticides are widely used round the globe for a plethora of applications that vastly includes agricultural fields and commercial gardens. Despite their wide use that aid increase in crop yield, they have ill-effects on environment and non-target organisms. Organophosphates (OP) are an important class of pesticides, which cause irreversible inhibition of acetylcholinesterase (AChE). Irreversible inhibition of AChE may lead to severe pathological conditions such as muscular paralysis, bronchial c...
2 Citations