02718nas a2200229   4500008004100000022001400041245012700055210006900182260007100251300001600322490000700338520184800345100002002193700001902213700002202232700001502254700002002269700002502289700003002314700001502344856012902359       2005                        eng d  a0743-746300aCobalt and magnesium ferrite nanoparticles: preparation using liquid foams as templates and their magnetic characteristics0 aCobalt and magnesium ferrite nanoparticles preparation using liq  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcNOV  a10638-106430 v213 a<p>An easy and convenient method for the synthesis of cobalt and magnesium ferrite nanoparticles is demonstrated using liquid foams as templates. The foam is formed from an aqueous mixture of an anionic surfactant and the desired metal ions, where the metal ions are electrostatically entrapped by the surfactant at the thin borders between the foam bubbles and their junctions. The hydrolysis is carried out using alkali resulting in the formation of desired nanoparticles, with the foam playing the role of a template. However, in the formation of ferrites with the formula MFe2O4, where the metal ion and iron possess oxidation states of +2 and +3, respectively, forming a foam from a 1:2 mixture of the desired ionic solutions would lead to a foam composition at variance with the original solution mixture because of greater electrostatic binding of ions possessing a greater charge with the surfactant. In our procedure, we circumvent this problem by preparing the foam from a 1:2 mixture of M2+ and Fe2+ ions and then utilizing the in situ conversion of Fe2+ to Fe3+ under basic conditions inside the foam matrix to get the desired composition of the metal ions with the required oxidation states. The fact that we could prepare both CoFe2O4 and MgFe2O4 particles shows the vast scope of this method for making even multicomponent oxides. The magnetic nanoparticles thus obtained exhibit a good crystalline nature and are characterized by superparamagnetic properties. The magnetic features observed for CoFe2O4 and MgFe2O4 nanoparticles are well in accordance with the expected behaviors, with CoFe2O4 particles showing higher blocking temperatures and larger coercivities. These features can easily be explained by the contribution of Co2+ sites to the magnetocrystalline anisotropy and the absence of the same from the Mg2+ ions.</p>1 aBala, Tanushree1 aSankar, C., R.1 aBaidakova, Marina1 aOsipov, V.1 aEnoki, Toshiaki1 aJoy, Pattayil, Alias1 aPrasad, Bhagavatula L. V.1 aSastry, M.  uhttps://library.ncl.res.in/content/cobalt-and-magnesium-ferrite-nanoparticles-preparation-using-liquid-foams-templates-and-002294nas a2200241   4500008004100000022001400041245010300055210006900158260008700227300001200314490000700326520137000333653002301703653002301726653002201749653003701771653002201808100002001830700001501850700003301865700002501898856012901923       2005                        eng d  a0095-244300aCure characteristics and dielectric properties of magnetic composites containing strontium ferrite0 aCure characteristics and dielectric properties of magnetic compo  a1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLANDbSAGE PUBLICATIONS LTDcAPR  a109-1210 v373 a<p>Hexagonal strontium ferrite (SrFe12O19) powders were synthesized by the conventional ceramic techniques. They were then characterized by the X-ray diffraction method and incorporated in the natural rubber matrix according to a specific recipe for various loadings of ferrite to produce rubber ferrite composites (RFCs). The processability of these compounds was determined by evaluating the cure characteristics namely, scorch time, cure time, minimum and maximum torque. The evaluation of the dielectric properties of ceramic strontium ferrite (SrF), natural rubber gum vulcanizate, and RFCs were done with the help of a Hewlett Packard (HP) impedance analyzer. The magnetic properties of these composites were studied using a Vibrating Sample Magnetometer (VSM). The effect of carbon black on the processability, and the magnetic and dielectric properties were also studied by the incorporation of carbon black into these composites. It has been found that the addition of these ferrites and carbon black does not affect the processability of these composites, whereas the physical properties are found to be modified. From the magnetic and dielectric measurements it has been found that flexible magnets having appropriate dielectric strength can be prepared by the incorporation of appropriate amount of SrF and carbon black in the natural rubber matrix.</p>10ahexagonal ferrites10aMagnetic materials10apermanent magnets10arubber ferrite composites (RFCs)10astrontium ferrite1 aSoloman, M., A.1 aKurian, P.1 aAnantharaman, Maliemadom, R.1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/cure-characteristics-and-dielectric-properties-magnetic-composites-containing-strontium-001393nas a2200205   4500008004100000022001400041245009500055210006900150260006900219300001100288490000800299520063300307653002300940653002300963653002400986653001101010100001801021700002501039856012301064       2006                        eng d  a0254-058400aCharacterization of nanosized NiZn ferrite powders synthesized by an autocombustion method0 aCharacterization of nanosized NiZn ferrite powders synthesized b  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcNOV  a98-1010 v1003 a<p>Nanocrystalline Ni0.5Zn0.5Fe2O4 with average particle size of similar to 9 nm has been synthesized by an autocombustion method and characterized by powder XRD, TEM and room temperature magnetic measurements. High room temperature magnetization comparable to that of the bulk material is obtained for the nanosized powders annealed at 800 degrees C, with a maximum particle size of similar to 54 nm. The results show that optimum properties can be achieved for NiZn ferrite powders synthesized by the present autocombustion method and processed at relatively lower temperatures. (c) 2005 Elsevier B.V. All rights reserved.</p>10aChemical synthesis10aMagnetic materials10amagnetic properties10aOxides1 aDeka, Sasanka1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/characterization-nanosized-nizn-ferrite-powders-synthesized-autocombustion-method-001510nas a2200217   4500008004100000022001400041245005400055210005300109260010300162300001000265490000700275520078400282100001401066700001601080700002501096700001801121700001501139700001701154700003301171856008801204       2010                        eng d  a0295-507500aColossal thermoelectric power in Gd-Sr manganites0 aColossal thermoelectric power in GdSr manganites  a6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCEbEPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETYcJUL  a170080 v913 a<p>Manganites belonging to the series Gd(1-x)Sr(x)MnO(3) (x=0.3, 0.4 and 0.5) were prepared by wet solid-state reaction and their thermoelectric power was evaluated. Thermoelectric power measurements revealed a peak value at similar to 40 K. All the samples exhibited a colossal thermopower at similar to 40K and in that Gd(0.5)Sr(0.5)MnO(3) exhibited a maximum value of similar to 35 V/K, which is the largest reported for these class of materials at this temperature. Temperature-dependent magnetisation measurements showed that the samples exhibit a phase transition from paramagnetic to spin-glass-like state at these temperatures. Plausible mechanisms responsible for the observed colossal thermoelectric power in Gd-Sr manganites are discussed. Copyright (C) EPLA, 2010</p>1 aSagar, S.1 aGanesan, V.1 aJoy, Pattayil, Alias1 aThomas, Senoy1 aLiebig, A.1 aAlbrecht, M.1 aAnantharaman, Maliemadom, R.  uhttps://library.ncl.res.in/content/colossal-thermoelectric-power-gd-sr-manganites-001742nas a2200241   4500008004100000022001400041245013100055210006900186260012500255300001100380490000800391520077200399100002101171700001501192700001901207700002101226700002201247700001801269700002501287700002501312700003301337856013001370       2013                        eng d  a0003-695100aContact potential induced enhancement of magnetization in polyaniline coated nanomagnetic iron oxides by plasma polymerization0 aContact potential induced enhancement of magnetization in polyan  aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScOCT  a1624140 v1033 a<p>The present work derives motivation from the so called surface/interfacial magnetism in core shell structures and commercial samples of Fe3O4 and gamma Fe2O3 with sizes ranging from 20 to 30 nm were coated with polyaniline using plasma polymerization and studied. The High Resolution Transmission Electron Microscopy images indicate a core shell structure after polyaniline coating and exhibited an increase in saturation magnetization by 2 emu/g. For confirmation, plasma polymerization was performed on maghemite nanoparticles which also exhibited an increase in saturation magnetization. This enhanced magnetization is rather surprising and the reason is found to be an interfacial phenomenon resulting from a contact potential. (C) 2013 AIP Publishing LLC.</p>1 aSethulakshmi, N.1 aSooraj, V.1 aSajeev, U., S.1 aNair, Swapna, S.1 aNarayanan, T., N.1 aJoy, Lija, K.1 aJoy, Pattayil, Alias1 aAjayan, Pulickel, M.1 aAnantharaman, Maliemadom, R.  uhttps://library.ncl.res.in/content/contact-potential-induced-enhancement-magnetization-polyaniline-coated-nanomagnetic-iron-001521nas a2200145   4500008004100000245013400041210006900175260000800244300001600252490000600268520092100274100002801195700002501223856012701248       2015                        eng d00aCitrate modified beta-cyclodextrin functionalised magnetite nanoparticles: a biocompatible platform for hydrophobic drug delivery0 aCitrate modified betacyclodextrin functionalised magnetite nanop  cFEB  a22117-221250 v53 a<p>Water-dispersible magnetite nanoparticles functionalized with citric acid (CIT) modified beta-cyclodextrin (CD) are prepared and curcumin (CUR) is loaded inside the cavity of CD. The CUR loading capacity of CD-CIT functionalized magnetite nanoparticles is found to be much larger than that of CD alone as well as the CD-CIT conjugate. The release profile of curcumin is found to follow zero order kinetics at the physiological pH, and thus, can release CUR at a constant rate, after the initial burst release. Relaxivity studies using NMR showed that the functionalized nanoparticles are suitable for contrast enhancement in MRI. Thus, the water-dispersible, CIT modified beta-CD functionalized magnetite nanofluid is an efficient carrier for water insoluble curcumin, and can be used for magnetic drug targeting/delivery as well as for contrast enhancement in MRI due to the superparamagnetic magnetite core.</p>1 aJayaprabha, Kunnoth, N.1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/citrate-modified-beta-cyclodextrin-functionalised-magnetite-nanoparticles-biocompatible00694nas a2200169   4500008004100000022001400041245009600055210006900151260005700220300001200277490000600289100002400295700002400319700003000343700002500373856012600398       2015                        eng d  a1868-252900aCo3O4 nanorods-efficient non-noble metal electrocatalyst for oxygen evolution at neutral pH0 aCo3O4 nanorodsefficient nonnoble metal electrocatalyst for oxyge  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcJUL  a331-3400 v61 aRamsundar, Rani, M.1 aDebgupta, Joyashish1 aPillai, Vijayamohanan, K.1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/co3o4-nanorods-efficient-non-noble-metal-electrocatalyst-oxygen-evolution-neutral-ph-000629nas a2200145   4500008004100000245013700041210006900178260000800247300002100255490000600276100001500282700003200297700002500329856012900354       2015                        eng d00aCorrelations between structure, microstructure, density and dielectric properties of the lead-free ferroelectrics Bi0.5(Na,K)0.5TiO30 aCorrelations between structure microstructure density and dielec  cNOV  a1550028 Page 1-60 v51 aAnjali, K.1 aAjithkumar, Thalasseril, G.1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/correlations-between-structure-microstructure-density-and-dielectric-properties-lead-free01427nas a2200157   4500008004100000022001400041245015000055210006900205260011000274300001600384490000700400520068000407100002601087700002501113856013101138       2015                        eng d  a1463-907600aCross over from 3D variable range hopping to the 2D weak localization conduction mechanism in disordered carbon with the extent of graphitization0 aCross over from 3D variable range hopping to the 2D weak localiz  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a16178-161850 v173 a<p>The changes in the electrical transport properties and mechanism of conduction in disordered carbon, with the extent of graphitization, are studied and discussed. With heat treatment induced graphitic ordering, the electrical properties are considerably modified, inducing a crossover from strong localization to weak localization behavior. Accordingly, the conduction mechanism is modified from the 3-dimensional variable range hopping (3D VRH) model to the 2-dimensional weak localization (2D WL) model. Results show that carrier-carrier and carrier-phonon interactions play major roles in developing the weak localization behavior with the extent of graphitization.</p>1 aRaj, Kovummal, Govind1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/cross-over-3d-variable-range-hopping-2d-weak-localization-conduction-mechanism-disordered-0