01815nas a2200253 4500008004100000022001400041245013700055210006900192260007300261300001000334490000800344520087200352653001701224653001401241653002401255653001401279653002301293100002701316700002501343700002401368700002101392700002201413856012601435 2010 eng d a0921-510700aInfluence of filler size and morphology in controlling the thermal emissivity of aluminium/polymer composites for space applications0 aInfluence of filler size and morphology in controlling the therm aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR a40-440 v1683 a

The paper has addressed the problem of controlling the thermal emissivities from metal/polymer composites prepared by solution method. Aluminium is used as a filler and polystyrene as a polymer-matrix. Aluminium particles, with micrometer and nanometer dimensions having different morphologies, were employed. The values of emissivities were reduced when the coarse grains and flakes of aluminium were used as fillers, whereas, no significant change was observed when nano-aluminium was used in the composite. Dielectric dispersion for the composites was measured and the results are analysed in view of Fresnel relation. The differences in the values of dielectric constants, between the experimentally measured and those which can be predicted theoretically, are thought to arise from the interfacial polarization. (C) 2009 Elsevier B.V. All rights reserved.

10aCamouflaging10aComposite10adielectric constant10aInfra-red10aThermal emissivity1 aBabrekar, Harshada, A.1 aKulkarni, Naveen, V.1 aJog, Jyoti, Prakash1 aMathe, Vikas, L.1 aBhoraskar, S., V. uhttps://library.ncl.res.in/content/influence-filler-size-and-morphology-controlling-thermal-emissivity-aluminiumpolymer-002099nas a2200265 4500008004100000022001400041245009500055210006900150260006900219300001400288490000800302520117200310653002201482653002601504653001801530653002901548653000801577100002201585700002201607700001801629700002201647700002101669700001601690856012701706 2011 eng d a0925-838800aMagnetic properties of thermal plasma synthesized nanocrystalline nickel ferrite (NiFe2O4)0 aMagnetic properties of thermal plasma synthesized nanocrystallin aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR a4404-44130 v5093 a

A rapid synthesis method is reported for magnetic nanoparticles of nickel ferrite involving thermal plasma assisted vapor phase condensation process. The as-synthesized samples were characterized by X-ray Diffraction, Transmission Electron Microscopy, Vibrating Sample Magnetometer and X-ray Photoelectron Spectroscopy techniques. The average particle size was determined from the TEM micrographs and found to be around 30 nm. The effects of reactor parameters on the magnetic and structural properties have been evaluated, to find the optimized parameters so as to achieve the highest values of saturation magnetization and coercivity. Reasonably high saturation magnetization (48 emu/g) has been assigned to the high degree of crystallinity, achieved on account of high temperature during the growth, and the cation redistribution. The high value of coercivity (1150e) is explained on the basis of possible lattice defects arising from the cation redistribution. Detailed analysis of cation distribution using the XRD line intensity data leads to the conclusion that these samples are iron deficit and nickel rich. (C) 2011 Elsevier B.V. All rights reserved.

10acrystal structure10aMagnetic measurements10aMagnetization10aNanostructured materials10aTEM1 aNawale, Ashok, B.1 aKanhe, Nilesh, S.1 aPatil, K., R.1 aBhoraskar, S., V.1 aMathe, Vikas, L.1 aDas, A., K. uhttps://library.ncl.res.in/content/magnetic-properties-thermal-plasma-synthesized-nanocrystalline-nickel-ferrite-nife2o4-002223nas a2200289 4500008004100000022001400041245009600055210006900151260006900220300001200289490000800301520124000309653002301549653002401572653002701596653001901623100001901642700002201661700001801683700001801701700001401719700001701733700002201750700002101772700001601793856012401809 2012 eng d a0254-058400aMagnetic properties of nanocrystalline CoFe2O4 synthesized by thermal plasma in large scale0 aMagnetic properties of nanocrystalline CoFe2O4 synthesized by th aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcDEC a586-5950 v1373 a

The paper reports the large scale synthesis of nanoparticles of CoFe2O4 using thermal plasma reactor by gas phase condensation method. The yield of formation was found to be around 15 g h(-1). The magnetic properties of CoFe2O4, synthesized at different reactor powers, were investigated in view of studying the effect of operating parameters of plasma reactor on the structural reorganization leading to the different cation distribution. The values of saturation magnetization, coercivity and remanent magnetization were found to be influenced by input power in thermal plasma. Although the increase in saturation magnetization was marginal (61 emu g(-1) to 70 emu g(-1)) with increasing plasma power; a significant increase in the coercivity (552 Oe to 849 Oe) and remanent magnetization (16 emu g(-1) to 26 emu g(-1)) were also noticed. The Mossbauer spectra showed mixed spinel structure and canted spin order for the as synthesized nanoparticles. The detailed analysis of cation distribution using the Mossbauer spectroscopy and X-ray photoelectron spectroscopy leads to the conclusion that the sample synthesized at an optimized power shows the different site selective states. (C) 2012 Elsevier B.V. All rights reserved.

10aMagnetic materials10amagnetic properties10aMossbauer spectroscopy10aNanostructures1 aNawale, A., B.1 aKanhe, Nilesh, S.1 aPatil, K., R.1 aReddy, V., R.1 aGupta, A.1 aKale, B., B.1 aBhoraskar, S., V.1 aMathe, Vikas, L.1 aDas, A., K. uhttps://library.ncl.res.in/content/magnetic-properties-nanocrystalline-cofe2o4-synthesized-thermal-plasma-large-scale-001338nas a2200253 4500008004100000022001400041245011100055210006900166260007300235300001200308490000800320520042000328653001500748653002400763653002000787653002300807100002700830700002400857700002100881700002000902700001300922700002200935856012700957 2012 eng d a0168-583X00aSwift heavy ion induced formation of Al/polymer composite layer for low thermal emissivity in the IR range0 aSwift heavy ion induced formation of Alpolymer composite layer f aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcSEP a135-1400 v2873 a

Composites of polymers with aluminium were formed by swift high energy ions of 150 MeV, which are used as low thermal emissivity materials for infrared wavelengths between 8-14 mu m. Emissivity and dielectric constants were studied for these structures. A semi-empirical model has been established to obtain the relation between emissivity and dielectric constant. (C) 2012 Elsevier B.V. All rights reserved.

10acomposites10adielectric constant10aSwift heavy ion10aThermal emissivity1 aBabrekar, Harshada, A.1 aJog, Jyoti, Prakash1 aMathe, Vikas, L.1 aAvasthi, D., K.1 aOjha, S.1 aBhoraskar, S., V. uhttps://library.ncl.res.in/content/swift-heavy-ion-induced-formation-alpolymer-composite-layer-low-thermal-emissivity-ir-002432nas a2200265 4500008004100000022001400041245008900055210006900144260007300213300001000286490000800296520147600304653002301780653004301803653001201846653003701858100002201895700002201917700002301939700002601962700002201988700001902010700002102029856011602050 2012 eng d a0022-024800aUnderstanding the growth of micro and nano-crystalline AlN by thermal plasma process0 aUnderstanding the growth of micro and nanocrystalline AlN by the aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a36-450 v3393 a

We report the studies related to the growth of crystalline AlN in a DC thermal plasma reactor, operated by a transferred arc plasma torch. The reactor is capable of producing the nanoparticles of Al and AlN depending on the composition of the reacting gas. Al and AlN micro crystals are formed at the anode placed on the graphite and nano crystalline Al and AlN gets deposited on the inner surface of the plasma reactor. X-ray diffraction, Raman spectroscopy analysis, single crystal X-ray diffraction and TGA-DTA techniques are used to infer the purity of post process crystals as a hexagonal AlN. The average particle size using SEM was found to be around 30 mu m. The morphology of nanoparticles of Al and AlN, nucleated by gas phase condensation in a homogeneous medium were studied by transmission electron microscopy analysis. The particle ranged in size between 15 and 80 nm in diameter. The possible growth mechanism of crystalline AlN at the anode has been explained on the basis of non-equilibrium processes in the core of the plasma and steep temperature gradient near its periphery. The gas phase species of AlN and various constituent were computed using Murphy code based on minimization of free energy. The process provides 50% yield of microcrystalline AlN and remaining of Al at anode and that of nanocrystalline h-AlN and c-Al collected from the walls of the chamber is about 33% and 67%, respectively. (C) 2011 Elsevier B.V. All rights reserved.

10aCrystal morphology10aGrowth from high temperature solutions10aNitride10aSemiconducting aluminum compound1 aKanhe, Nilesh, S.1 aNawale, Ashok, B.1 aGawade, Rupesh, L.1 aPuranik, Vedavati, G.1 aBhoraskar, S., V.1 aDas, Asoka, K.1 aMathe, Vikas, L. uhttps://library.ncl.res.in/content/understanding-growth-micro-and-nano-crystalline-aln-thermal-plasma-process-002705nas a2200217 4500008004100000022001400041245013000055210006900185260007400254300000800328490000700336520185900343100002502202700002202227700002202249700002102271700002602292700001802318700002102336856013002357 2015 eng d a0957-453000aMicro-structural analysis of NiFe2O4 nanoparticles synthesized by thermal plasma route and its suitability for BSA adsorption0 aMicrostructural analysis of NiFe2O4 nanoparticles synthesized by aVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDSbSPRINGERcAUG a2160 v263 a

The paper presents the experimental studies pertaining to the adsorption of bovine serum albumin (BSA) on the nanoparticles of nickel ferrite (NiFe2O4) with a view of correlating the adsorption properties to their microstructure and zeta potentials. Physical properties of two kinds of nickel ferrites, one synthesized by thermal plasma route and the other by chemical co-precipitation method, are compared. Maximum adsorption (231.57 lg/mg) of BSA onto nickel ferrite nanoparticles, at body temperature (37 degrees C) was observed at pH-value of 5.58 for the thermal plasma synthesized particles showing its higher adsorption capacity than those synthesized by wet chemical means (178.71 mu g/mg). Under the same physical conditions the value of zeta potential, obtained for the former, was higher than that of the latter over a wide range of pH values (3.64-9.66). This is attributed to the differences in the specific surface energies of the two kinds of nanoparticles arising from the degree of crystallinity. The paper presents the experimental evidence for the single crystalline nature of the individual nanoparticles, with mean size of 32 nm, for the thermal plasma synthesized particles as evidenced from the high resolution transmission electron microscopy and electron diffraction analysis. The measurements also reveal the poor crystalline morphology in the chemically prepared particles (mean size of 28 nm) although the X-ray diffraction patterns are not much different. The atomic force microscopy images confirm that the surfaces of plasma synthesized nanoparticles possesses higher surface roughness than that of chemically synthesized one. Presence of adsorbed protein was confirmed by vibrational spectroscopy. The Langmuir adsorption model is found to fit into the experimental data better than the Freundlich adsorption model.

1 aBhosale, Shivaji, V.1 aKanhe, Nilesh, S.1 aBhoraskar, S., V.1 aBhat, Suresh, K.1 aBulakhe, Ravindra, N.1 aShim, Jae-Jin1 aMathe, Vikas, L. uhttps://library.ncl.res.in/content/micro-structural-analysis-nife2o4-nanoparticles-synthesized-thermal-plasma-route-and-its-102378nas a2200205 4500008004100000245013000041210006900171260000800240300001200248490000800260520161700268100002501885700002601910700002601936700002001962700001701982700002501999700002102024856012702045 2017 eng d00aEffective degradation of organic water pollutants by atmospheric non-thermal plasma torch and analysis of degradation process0 aEffective degradation of organic water pollutants by atmospheric cJAN a396-4050 v1673 aThe paper reports the use of atmospheric non-thermal plasma torch as a catalyst for degradation of various organic pollutants dissolved in water. A flow of He mixed with air was used to produce the dielectric barrier discharge (DBD), at the tip of the torch, using pulsed electric excitation at 12 kV. The torch, operated at a power of 750 mW/mm², was seen to completely degrade the aqueous solutions of the pollutants namely methylene blue (MB), methyl orange (MO) and rhodamine-B (RB), at around 10⁻⁴ M concentrations, the concentration of polluants is one order higher than of routinely used heterogeneous photocatalytic reactions, within 10 min of irradiation time at room temperature. UV Visible spectra of the organic dye molecules, monitored after different intervals of plasma-irradiation, ranging between 1 and 10 min, have been used as tools to quantify their sequential degradation. Further, instead of using He, only air was used to form plasma plume and used for degradation of organic dye which follow similar trend as that of He plasma. Further, Liquid Chromatography Mass Spectroscopy (LCMS) technique has been used to understand degradation pathway of methylene blue (MB) as a representative case. Total organic carbon (TOC) measurements indicates significant decrease in its content as a function of duration of plasma exposure onto methylene blue as a representative case. Toxicity studies were carried out onto Gram negative Escherichia coli. This indicated that methylene blue, without plasma treatment, shows growth inhibition, whereas with plasma treatment no inhibition was observed.1 aBansode, Avinash, H.1 aMore, Supriya, Eknath1 aSiddiqui, Ejaz, Ahmad1 aSatpute, Shruti1 aAhmad, Absar1 aBhoraskar, Sudha, V.1 aMathe, Vikas, L. uhttps://library.ncl.res.in/content/effective-degradation-organic-water-pollutants-atmospheric-non-thermal-plasma-torch-and02226nas a2200241 4500008004100000022001400041245014000055210006900195260000800264300001200272490000600284520138100290653001501671653001901686653001501705100002801720700001801748700002101766700002401787700002401811700002301835856012601858 2017 eng d a2365-654900aExtraction of the very high tunneling current and extremely stable emission current from GdB6/W-tip source synthesized using arc plasma0 aExtraction of the very high tunneling current and extremely stab cJAN a562-5660 v23 a

Herein, we report the one step arc plasma synthesis of the GdB6 (Gadolinium hexaboride) nanoparticles and its field emission (FE) characteristics on tungsten point substrate (GdB6/ W). The SEM /TEM analysis revealed the GdB6 nanoparticles on W point substrate exhibit irregular shaped, grainy, dense, course morphology, i.e. uniformly covering the entire tip substrate surface. For GdB6/W point source, the values of the turn-on and threshold fields, defined as field required to draw an emission current density similar to 1 mA/cm(2) and similar to 100 mA/cm(2), respectively are found to be similar to 2.2 and similar to 2.7 V/mm, for anodecathode separation of similar to 1 mm. Interestingly, a very high emission current density of similar to 3.5 A/cm(2) has been drawn from the GdB6/W point emitter at relatively lower applied field of similar to 6.4 V/mm. The field enhancement factor found to be similar to 10,250. The GdB6/W point electron source exhibits a good emission current stability at similar to 10 mA for a period of 6 hr. The emission current stability is enumerated in terms of standard deviation and its magnitude has been measured to be only 1.72% with respect to the average value. The superlative field emission characteristics signify the GdB6/W point electron source as potential candidates for vacuum micro/nanoelectronics device applications.

10aArc Plasma10afield emission10aThin films1 aSuryawanshi, Sachin, R.1 aKanhe, Nilesh1 aMathe, Vikas, L.1 aPhase, Deodatta, M.1 aLate, Dattatray, J.1 aMore, Mahendra, A. uhttps://library.ncl.res.in/content/extraction-very-high-tunneling-current-and-extremely-stable-emission-current-gdb6w-tip02195nas a2200301 4500008004100000022001400041245016600055210006900221260001000290300001200300490000800312520113100320653001501451653002401466653003101490653002701521653001901548100002001567700002501587700001601612700002201628700002101650700002701671700002401698700002501722700002101747856012501768 2018 eng d a0304-885300aSingle step, phase controlled, large scale synthesis of ferrimagnetic iron oxide polymorph nanoparticles by thermal plasma route and their rheological properties0 aSingle step phase controlled large scale synthesis of ferrimagne cMAR 1 a232-2420 v4493 a

In this paper we report single step large scale synthesis of highly crystalline iron oxide nanoparticles viz. magnetite (Fe3O4) and maghemite (gamma-Fe2O3) via gas phase condensation process, where micron sized iron metal powder was used as a precursor. Selective phases of iron oxide were obtained by variation of gas flow rate of oxygen and hence partial pressure of oxygen inside the plasma reactor. Most of the particles were found to possesses average crystallite size of about 20-30 nm. The DC magnetization curves recorded indicate almost super-paramagnetic nature of the iron oxide magnetic nanoparticles. Further, iron oxide nanoparticles were analyzed using Raman spectroscopy, X-ray photoelectron spectroscopy and Mossbauer spectroscopy. In order to explore the feasibility of these nanoparticles for magnetic damper application, rheological studies have been carried out and compared with commercially available Carbonyl Iron (CI) particles. The nanoparticles obtained by thermal plasma route show improved dispersion which is useful for rheological applications. (C) 2017 Elsevier B.V. All rights reserved.

10aIron oxide10amagnetic properties10aNano-crystalline materials10aRheological properties10aThermal plasma1 aRaut, Suyog, A.1 aMutadak, Pallavi, R.1 aKumar, Shiv1 aKanhe, Nilesh, S.1 aHuprikar, Sameer1 aPol, Harshawardhan, V.1 aPhase, Deodatta, M.1 aBhoraskar, Sudha, V.1 aMathe, Vikas, L. uhttps://library.ncl.res.in/content/single-step-phase-controlled-large-scale-synthesis-ferrimagnetic-iron-oxide-polymorph