02032nas a2200313 4500008004100000022001400041245010400055210006900159260007900228300001400307490000700321520096200328653001601290653002701306653001901333653002101352100002001373700002501393700002101418700001401439700002201453700002201475700001701497700001601514700002201530700002301552700001401575856012901589 2008 eng d a1044-580300aMossbauer spectroscopic investigations of nanophase iron oxides synthesized by thermal plasma route0 aMossbauer spectroscopic investigations of nanophase iron oxides  a360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USAbELSEVIER SCIENCE INCcSEP a1215-12200 v593 a

Magnetic nanoparticles of iron oxide were synthesized by transferred arc plasma induced gas phase condensation method. Structural, morphological and magnetic studies of the as synthesized powder were carried out using X-ray diffraction, transmission electron microscopy and Mossbauer spectroscopy. These studies have revealed the simultaneous nucleation and condensation of different magnetic phases with a broad size distribution of the nanoparticles which is peaked at 30-50 nm and ranges from 10 nm to 80 nm. 57 Fe Mossbauer spectra recorded at various temperatures (5 K-300 K) in presence of external magnetic field (at 5 K) have suggested the presence of different phases of iron oxide with sizable amounts of gamma-Fe2O3 and alpha-Fe2O3 in addition to Fe3O4. The relative concentrations of these phases have been obtained by a self consistent spectral area analysis and were found to be 44:22:34 (%). (C) 2007 Elsevier Inc. All rights reserved.

10airon oxides10aMossbauer spectroscopy10aphase analysis10aplasma synthesis1 aNagar, Harshada1 aKulkarni, Naveen, V.1 aKarmakar, Soumen1 aSahoo, B.1 aBanerjee, Indrani1 aChaudhari, P., S.1 aPasricha, R.1 aDas, A., K.1 aBhoraskar, S., V.1 aDate, Sadgopal, K.1 aKeune, W. uhttps://library.ncl.res.in/content/mossbauer-spectroscopic-investigations-nanophase-iron-oxides-synthesized-thermal-plasma-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-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-1