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Effect of Synthesis Method on Photoluminescence Properties of na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) nanophosphor

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nano-Micro Letters 2012年第2期4卷 78-82页

作者： k.n.shinde S.J.Dhoble k.Park n. S. Science and Arts College Department of Physics RTM Nagpur university Faculty of nanotechnology and Advanced Materials Engineering Sejong University

We have synthesized a series of single-composition emission na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) phosphor by traditional solid state reactions and novel combustion method. Formation of compound was confirmed by X-ray diffraction analysis. The photoluminescence(PL) emission spectra were observed at 376 nm when excited around 322 nm for the various concentrations in both cases. The PL emission spectra of phosphors showed strong Ce^(3+)emission due to the 5d → 4f transition of Ce^(3+)ions. The Ce^(3+)emission intensity in na_2Sr_2Al_2PO_4Cl_9:Ce^(3+) prepared by combustion was higher than that of solid state reactions.

关键词： nanophosphor Luminescence Halophosphate

Luminescence in rare earth activated AlPO4 phosphor

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Luminescence in rare earth activated AlPO4 phosphor

ZrOCl_2·8H_2O catalyzed solvent-free synthesis of isobenzofuran-1(3H)-ones

The 1st International Congress on Advanced Materials 2011

作者： k.n.shinde S.J.Dhoble n.S.Science and Arts College Department of Physics RTM Nagpur University

Rare earth activated AlPO 4 phosphors were synthesized by solid-state reactions and the completion of the synthesis was confirmed by X-ray diffraction (XRD) pattern. Under near-ultraviolet (nUV) light, the Eu3+ emission in AlPO4 consists of the transitions from 5D0 to7FJ shows orange/red region and the AlPO 4 :Dy3+ phosphor shows an efficient blue and yellow band emissions, which originates from the 4F9/2→6H15/2 and 4F9/2→6H13/2 transitions of Dy3+ ion. The excitation spectra of the phosphors are extending from 300 to 400 nm, which are characteristics of nUV excited LED. The effect of the Eu3+ and Dy3+ concentration on the luminescence properties of AlPO4 phosphors is also studied.

关键词： Phosphate phosphor photoluminescence

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Chinese Chemical Letters 2011年第2期22卷 163-166页

作者： Jaiprakash n.Sangshetti Siddique Akber M.k.Ansari Devanand B.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004(MS)India

ZrOCl2·8H2O catalyzed environmentally benign synthesis of isobenzofuran-1（3H）-ones are ***2·8H2O appeared to be an excellent catalyst for the condensation and *** of phthalaldehydic acid（2-carboxybenzaldehyde） with methylaryl and cyclic ketones was initiated by condensation and occurred in one step providing excellent yields（90-98%）.

关键词： 2-Carboxybenzaldehyde Methylaryl and cyclic ketones ZrOCl_2·8H_2O catalyst

CFD-DEM analysis of particle polydispersity on the performance of fluidised bed reactor during silane pyrolysis Author links open overlay panel

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Particuology 2024年第8期91卷 72-87页

作者： Akshayveer Vijay M.shinde MS2Discovery Interdisciplinary Research Institute Wilfrid Laurier UniversityWaterlooOntarioN2L3C5Canada Department of Chemical Engineering Indian Institute of Technology(BHU)Varanasi221005India

A CFD-DEM model is developed for chemical vapour deposition of silane in a fluidized bed reactor to investigate the effect of polydispersity on local phase dynamics,mass and heat transport,as well as the rate of Si *** gas-phase fines formation and heterogeneous deposition on the seed particle,as well as the scavenging effect for Si particle growth,are *** method is first validated against the experimentally measured Si deposition rate,percentage of fine production and minimum fluidisation ***,the properties,primarily particle intermixing,fluidisation behaviour and bubble dynamics along with the deposition process,are analyzed for several polydisperse beds under various operating *** effect of polydispersity of the bed on a fraction of the bubble size,dense phase expansion and interchange coefficient between various phases is thoroughly investigated to establish a correlation with reactor *** results show that broad-Gaussian particle size distribution(PSD)exhibits excellent improvement in fluidisation behaviour,resulting in a high deposition rate,and minimum formation of Si fines.

关键词： CFD-DEM method Chemical vapour deposition(CVD) Particle size distribution Silicon Gas-solid fluidized bed

Oxalic acid as a catalyst for efficient synthesis of bis-(indolyl)methanes,and 14-aryl-14H-dibenzo[a,j]xanthenes in water

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Chinese Chemical Letters 2008年第10期19卷 1186-1189页

作者： nagnnath D.kokare Jaiprakash n.Sangshetti Devanand B.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004(MS)India New Drug DiscoveryWockhardt Research CentreAurangabad 431210(MS)India Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004(MS)India

A simple, efficient, and environment benign route was developed for the preparation of bis-（indolyl）methanes and 14-aryl-14H- dibenzo[aj]xanthenes from condensation of various aromatic aldehydes or ketones with indole, and 2-naphthol, respectively, using oxalic acid catalyst in aqueous medium. Use of cheap and easily available catalyst, better yields and simple reaction protocol are the advantages of the present method.

关键词： Oxalic acid Bis-(indolyl)methanes 14-Aryl-14H-dibenzo[a,j]xanthenes Aldehydes

Sulfanilic acid catalyzed solvent-free synthesis of 1,5-benzodiazepine derivatives

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Chinese Chemical Letters 2007年第11期18卷 1305-1308页

作者： Jaiprakash n.Sangshetti nagnnath D.kokare Devanand B.shinde Department of Chemical Technology.Dr.Babasaheb Ambedkar Marathwada University Aurangabad 431004.MS India Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University Aurangabad 431004MSIndia New Drug DiscoveryWockhardt Research CentreAurangabad 431210MSIndia Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University Aurangabad 431004MSIndia

Sulfanilic acid has been found to be an efficient catalyst for the synthesis of 1,5-benzodiazepines from o-phenylenediamine and ketones. This method is simple, effective and environmentally friendly and gives better y... 详细信息

关键词： 1,5-Benzodiazepines Sulfanilic acid catalyst Solvent free condition

Oxalic acid catalyzed solvent-free one pot synthesis of coumarins

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Chinese Chemical Letters 2007年第11期18卷 1309-1312页

作者： nagnnath D.kokare Jaiprkash n.Sangshetti Devanand B.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University Aurangabad 431004 (MS)India Wockhardt Research CentreNew Drug DiscoveryAurangabad 431210 (MS)India Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University Aurangabad 431004 (MS)India

Oxalic acid was found to be an efficient catalyst for Pechmann condensation, which includes the reaction between phenols and β-keto esters leading to formation of coumarin derivatives. The advantages of present methods are the use of cheap and easy available catalyst, solvent-free reaction conditions, better yields and shorter reaction time.

关键词： Coumarins Oxalic acid Solvent-free reaction Pechmann condensation β-keto esters Phenols

Physical properties of hematite α-Fe_2O_3 thin films:application to photoelectrochemical solar cells

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Journal of Semiconductors 2011年第1期32卷 9-16页

作者： S.S.shinde R.A.Bansode C.H.Bhosale k.Y.Rajpure Electrochemical Materials Laboratory Department of Physics Shivaji University

The physical properties and photoelectrochemical characterization of aluminium doped hematite α-Fe2O3, synthesized by spray pyrolysis, have been investigated in regard to solar energy conversion. Stable Al-doped iron （Ⅲ） oxide thin films synthesized by a spray pyrolysis technique reveals an oxygen deficiency, and the oxide exhibits n-type conductivity confirmed by anodic photocurrent generation. The preparative parameters have been optimized to obtain good quality thin films which are uniform and well adherent to the substrate. The deposited iron oxide thin films show the single hematite phase with polycrystalline rhombohedral crystal structure with crystallite size 20-40 nm. Optical analysis enabled to point out the increase in direct band-gap energy from 2.2 to 2.25 eV with doping concentration which is attributed to a blue shift. The dielectric constant and dielectric loss are studied as a function of frequency. To understand the conduction mechanism in the films, AC conductivity is measured. The conduction occurs by small polaron hopping through mixed valences Fe2＋/3＋ with an electron mobility 300 k of 1.08 cma/（V.s）. The oe-Fe203 exhibits long term chemical stability in neutral solution and has been characterized photoelectrochemically to assess its activity as a photoanode for various electrolytes using white light to obtain I- V characteristics. The Al-doped hematite exhibited a higher photocurrent response when compared with undoped films achieving a power conversion efficiency of 2.37% at 10 at% Al：Fe2O3 thin films along with fill factor 0.38 in naOH electrolyte. The flat band potential Vfb （-0.87 VscE） is determined by extrapolating the linear part to C-2 = 0 and the slope of the Mott-Schottky plot.

关键词： photoelectrochemical hematite spray photoanode

Effect of nd^(3+) substitution on structural and magnetic properties of Mg-Cd ferrites synthesized by microwave sintering technique

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Journal of Rare Earths 2018年第4期36卷 390-397页

作者： S.R.Bhongale H.R.Ingawale T.J.shinde P.n.Vasambekar Department of Physics Yashavantrao Chavan Institute of Science Department of Physics B.V.M.B.S.K.Kanya Mahvidyalaya Department of Physics K.R.P.Kanya Mahvidyalaya Department of Electronics Shivaji University

nd3＋ substituted spinel ferrites with formula MgxCd1-xnd0.03Fe1.97O4（x = 0.0.2,0.4,0.***.0.8 and 1.0）were prepared by oxalate co-precipitation method using novel microwave sintering technique. AR grade sulphates were used as starting chemicals. The samples were sintered at optimized power of 70 W for10 min in a microwave oven（800 W）. The structural analysis of these samples was done by using X-ray diffraction, scanning electron microscope and Fourier transform IR techniques. The XRD analysis of the synthesized ferrite confirms the formation of cubic spinel structure of ferrite. The influence of nd3＋substitution on various structural parameters of Mg-Cd ferrites was reported. IR study indicates the spectra contain two intense absorption bands around 600 and 400 cm^（-1） in addition with four extra bands. The magnetic properties of all ferrites were studied by using a vibration sample *** crystallite and grain size dependant magnetic properties are observed. The composition Mg_（0.6）Cd_（0.4）nd_（0.03）Fe_（1.97）O_4 has better magnetic properties that can be used in recording media. The fast synthesis of spinel ferrites is yielded due to use of the microwave sintering technique.

关键词： Mg-nd-Cd ferrite Rare earth Microwave sintering IR study Coercive force