@article { ISI:000235439900024, title = {Low temperature route to prepare LaMnO3}, journal = {Materials Letters}, volume = {60}, number = {9-10}, year = {2006}, month = {MAY}, pages = {1213-1214}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A combination of digestion and further low temperature calcination to crystallize the product is employed to prepare LaMnO3(LM) ceramics. Freshly co-precipitated lanthanum and manganese hydroxides gel is allowed to react at 100 degrees C under refluxing and stirring conditions for 6-12 h. The X-ray amorphous product so formed is heated at 300 degrees C to form crystalline LM powders. This is the lowest temperature so far reported for the formation of LaMnO3. Transmission electron microscope (TEM) investigations revealed that the average particle size is 50 nm for the calcined powders. (c) 2005 Elsevier B.V All rights reserved.

}, keywords = {Chemical synthesis, LaMnO3, Precipitation, transmission electron microscopy, X-ray diffraction}, issn = {0167-577X}, doi = {10.1016/j.matlet.2005.11.002}, author = {Daundkar, A. and Kale, Sangeeta N. and Gokhale, Suresh P. and Ravi, V} } @article { ISI:000245760900020, title = {Low temperature route to prepare LaFeO3 and LaCoO3}, journal = {Materials Letters}, volume = {61}, number = {10}, year = {2007}, month = {APR}, pages = {2030-2032}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A combination of digestion and further low temperature calcination to crystallize the product was employed to prepare LaFeO3 (LF) and LaCoO3 (LC) powders. Freshly co-precipitated lanthanum and ferric (or cobalt) hydroxide gels by sodium hydroxide were allowed to react at 100 degrees C under refluxing and stirring conditions for 4-6 h. These oven dried powders were heated at 450 degrees C to from crystalline LF (or LC) powders. The phase contents and lattice parameters were investigated by X-ray diffraction (XRD). Transmission electron microscope (TEM) investigations were carried out to examine the morphology and average particle size of these powders. (c) 2006 Elsevier B.V. All rights reserved.

}, keywords = {Chemical synthesis, LaFeO3, Precipitation, transmission electron microscopy, X-ray diffraction}, issn = {0167-577X}, doi = {10.1016/j.matlet.2006.08.009}, author = {Jadhav, A. D. and Gaikwad, A. B. and Samuel, V. and Ravi, V.} } @article { ISI:000253700400019, title = {Integrated process for extraction and purification of alcohol dehydrogenase from Baker{\textquoteright}s yeast involving precipitation and aqueous two phase extraction}, journal = {Biochemical Engineering Journal}, volume = {38}, number = {3}, year = {2008}, month = {MAR}, pages = {414-420}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

The potential of aqueous two phase extraction for the purification of alcohol dehydrogenase (ADH) from Baker{\textquoteright}s yeast (Saccharomyces cerevisiae) is demonstrated. An integrated process involving precipitation followed by aqueous two phase extraction (ATPE) is used for effective recovery of the enzyme. This is carried out in two schemes. In the first scheme, ammonium sulphate precipitation is carried out followed by ATPE of the precipitate after suspending it in buffer. While the second scheme involves polyethylene glycol precipitation followed by ATPE of the supernatant. The effect of various process parameters such as molecular weight of polymer, tie line length, phase volume ratio and neutral salt is investigated for enhancing the activity recovery of ADH. First scheme resulted in about 85\% enzyme activity recovery of ADH with purification factor of 4.2 while the second scheme about 90\% enzyme activity recovery with 6.6-fold purification. (C) 2007 Elsevier B.V. All rights reserved.

}, keywords = {Alcohol dehydrogenase, aqueous two phase extraction, enzyme extraction, Precipitation, Purification, Yeast}, issn = {1369-703X}, doi = {10.1016/j.bej.2007.08.007}, author = {Madhusudhan, M. C. and Raghavarao, K. S. M. S. and Nene, Sanjay} } @article { ISI:000252408000048, title = {Synthesis of LSMO at low temperature by novel hydroxide precursor technique}, journal = {Materials Letters}, volume = {62}, number = {3}, year = {2008}, month = {FEB}, pages = {527-529}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

A novel technique of mixing individual hydroxide is employed to prepare La0.65Sr0.35MnO3 (LSMO) at low temperature. Freshly prepared lanthanum and manganese hydroxides are mixed thoroughly with strontium hydroxide in stoichiometric ratio and heated at different temperatures ranging from 100 to 500 degrees C for 6 h. At 500 degrees C, formation of La0.65Sr0.35MnO3 was confirmed by the X-ray diffraction studies (XRD). This is the lowest temperature so far reported in the literature. The particle size and morphology were investigated by scanning electron microscopy (SEM). (c) 2007 Elsevier B.V. All rights reserved.

}, keywords = {Ceramics, Electron microscopy, La0.65Sr0.35MnO3, Oxides, Precipitation, X-ray diffraction}, issn = {0167-577X}, doi = {10.1016/j.matlet.2007.05.077}, author = {Gupta, U. N. and Muthurajan, H. and Kumar, H. H. and Rao, N. Koteswara and Gokhale, Suresh P. and Ravi, V.} } @article { ISI:000342525100047, title = {Preparation and characterization of porous fly ash/NiFe2O4 composite: promising adsorbent for the removal of congo red dye from aqueous solution}, journal = {Materials Chemistry and Physics}, volume = {148}, number = {1-2}, year = {2014}, month = {NOV}, pages = {371-379}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

A series of fly ash/NiFe2O4 composites were prepared using fly ash and aqueous solutions of Ni, Fe nitrate salts and NaOH by co-precipitation followed by calcination method. The \% mass ratio of fly ash: NiFe2O4 was varied in the range of 0:100 to 100:0. Samples were characterized by powder XRD, SEM, FTIR and N-2 adsorption-desorption measurements. These samples were further evaluated for their adsorptive performance in removal of Congo red (CR) dye from an aqueous solution. In all the composites, spinel nickel ferrite phase was found to be capable to get anchored with the fly ash surface and exhibited more crystalline nature as compared to pure NiFe2O4 phase. The BET surface area and porous character of the composite were found to increase with the decrease in the contribution of the fly ash, reach to maximum and then decreases on further decrease in fly ash. The composite having \% mass ratio of fly ash: NiFe2O4 = 50:50 exhibited maximum CR adsorption from the aqueous solution on account of the higher BET surface area, more porous character, favorable condition for diffusion of dye molecules and combined effect of chemisorption and physisorption. Under optimum conditions, it has shown the recyclability with adsorption capacity of the magnitude 23.33 mg g(-1), which is much higher than individual fly ash, NiFe2O4 and other composites. The sorption data provided good fit with pseudo-second order kinetic model. The analyses of the adsorption data indicated that, the Langmuir model provides better correlation with the experimental data. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {Adsorption, Composite material, Electron microscopy (SEM), Inorganic compounds, powder diffraction, Precipitation}, issn = {0254-0584}, doi = {10.1016/j.matchemphys.2014.07.057}, author = {Sonar, Shilpa K. and Niphadkar, Prashant S. and Mayadevi, S. and Joshi, Praphulla N.} } @article { ISI:000338820600009, title = {Synthesis and luminescence of graphene-nano calcium sulphide composite}, journal = {Materials Chemistry and Physics}, volume = {147}, number = {1-2}, year = {2014}, month = {SEP}, pages = {57-64}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

Graphene-nanocrystalline calcium sulphide has been synthesized using in-situ reduction of calcium salt and graphene oxide. Graphene oxide was prepared using Hummer{\textquoteright}s method. Surface morphology and crystal structure of samples were observed by transmission electron microscopy (TEM) and X-Ray diffraction (XRD). Ultra thin graphene and graphene oxide sheets with size ranging between tens to several hundreds of square nanometers are observed in TEM images. The TEM micrographs of G-CaS show that CaS particles are embedded in graphene sheets and the average particle size of CaS particles in the composite is less than 50 nm. The reduction in the intensity of various functional groups in FTIR spectrum also confirms the formation of graphene. The UV-Visible spectra of CaS shows absorption peak at 220 nm with a small shoulder at 250 nm whereas in G-CaS 220 nm absorption peak has reduced intensity and the shoulder at 250 nm has now shifted to 270 nm due to modification in the defect structure of CaS by graphene. CaS and G-CaS shows photoluminescence emission at 470 nm (lambda(exc.) = 375 nm) and 440 nm (lambda(exc.) = 350 nm) respectively, however emission intensity of G-CaS is relatively lower than CaS. Although the emission intensity is found to be lower than CaS, addition of CaS to graphene in G-CaS complex has made graphene luminescent. XPS spectra also indicate reduction of various oxygen containing functional groups in highly reduced graphene oxide and G-CaS. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {Luminescence, Nanostructures, powder diffraction, Precipitation}, issn = {0254-0584}, doi = {10.1016/j.matchemphys.2014.04.006}, author = {Sharma, Geeta and Patil, K. R. and Gosavi, S. W.} }