01842nas a2200217   4500008004100000022001400041245009200055210006900147260007300216300001000289490000800299520101600307653002601323653002901349653001901378100002701397700002501424700001901449700003301468856012301501       2009                        eng d  a0921-510700aSynthesis of nickel-rubber nanocomposites and evaluation of their dielectric properties0 aSynthesis of nickelrubber nanocomposites and evaluation of their  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN  a24-310 v1563 a<p>Nanocomposites based on natural rubber and nano-sized nickel were synthesized by incorporating nickel nanoparticles in a natural rubber matrix for various loadings of the filler. Structural, morphological, magnetic and mechanical properties of the composites were evaluated along with a detailed study of dielectric properties. It was found that nickel particles were uniformly distributed in the matrix without agglomeration resulting ill a magnetic nanocomposite. The elastic properties showed an improvement with increase in filler content but breaking stress and breaking strain were found to decrease. Dielectric permittivity was found to decrease with increase in frequency, and found to increase with increase in nickel loading. The decrease in permittivity with temperature is attributed to the high volume expansivity of rubber at elevated temperatures. Dielectric loss of blank rubber as well as the composites was found to increase with temperature. (C) 2008 Elsevier B.V. All rights reserved.</p>10aDielectric relaxation10aInterfacial polarization10aNanocomposites1 aJamal, Muhammad, Abdul1 aJoy, Pattayil, Alias1 aKurian, Philip1 aAnantharaman, Maliemadom, R.  uhttps://library.ncl.res.in/content/synthesis-nickel-rubber-nanocomposites-and-evaluation-their-dielectric-properties-001783nas a2200265   4500008004100000022001400041245007000055210006900125260006900194300001200263490000800275520088300283653002401166653002501190653002501215653002301240653001901263653001901282100001901301700001901320700001601339700002501355700003301380856010401413       2010                        eng d  a0925-838800aFlexible microwave absorber based on nickel ferrite nanocomposite0 aFlexible microwave absorber based on nickel ferrite nanocomposit  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcJAN  a297-3030 v4893 a<p>Flexible magnetic composite materials were prepared by incorporating precharacterized nickel ferrite nanoparticles in a natural rubber matrix. The complex dielectric permittivity and magnetic permeability of the composites were measured at different microwave frequencies using the cavity perturbation technique. A steady increase in dielectric permittivity was observed with increase in filler concentration. Maxwell-Garnett mixture equations were employed to model the effective permittivity and permeability of the composite. Reflection loss was estimated by employing the model of single layer absorber backed with a perfect conductor. Reflection loss minima of -5.9 dB at 3.2 GHz for 12 mm thick rubber ferrite composite sheet is obtained in the S-band while a loss up to -16 dB could be achieved at 9.5 GHz in the X-band. (C) 2009 Elsevier B.V. All rights reserved.</p>10aCavity perturbation10aComplex permeability10aComplex permittivity10aMicrowave absorber10aNanocomposites10aNickel ferrite1 aSunny, Vijutha1 aKurian, Philip1 aMohanan, P.1 aJoy, Pattayil, Alias1 aAnantharaman, Maliemadom, R.  uhttps://library.ncl.res.in/content/flexible-microwave-absorber-based-nickel-ferrite-nanocomposite-001870nas a2200229   4500008004100000022001400041245009100055210006900146260005700215300001200272490000700284520104000291653002501331653002001356653002401376653001901400100002701419700002501446700001901471700003301490856011701523       2010                        eng d  a0170-083900aOn the magnetic, mechanical and rheological properties of rubber-nickel nanocomposites0 amagnetic mechanical and rheological properties of rubbernickel n  a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcMAY  a907-9230 v643 a<p>Rubber-nickel nanocomposites were synthesized by incorporating freshly prepared nanometric nickel particles in two different matrices namely natural rubber and neoprene rubber according to specific recipes for various loadings of nano nickel and the cure characteristics of these composites were evaluated. The maximum torque values register an increase with the increase in loading of nickel in both composites and this is attributed to the non-interacting nature of nickel nanoparticles with rubber matrices. The cure time of natural rubber composites decreases with increase in the content of nickel, and in neoprene rubber cure, time increases with increase in filler content. In natural rubber, the curing reaction seems to be activated by the presence of nickel particles. The magnetization studies of the composites reveal that the magnetic properties of nickel are retained in the composite samples. The elastic modulus of natural rubber and neoprene rubber are largely improved by the incorporation of nickel particles.</p>10aCure characteristics10aElastic modulus10amagnetic properties10aNanocomposites1 aJamal, Muhammad, Abdul1 aJoy, Pattayil, Alias1 aKurian, Philip1 aAnantharaman, Maliemadom, R.  uhttps://library.ncl.res.in/content/magnetic-mechanical-and-rheological-properties-rubber-nickel-nanocomposites-002511nas a2200265   4500008004100000022001400041245010000055210006900155260007600224300001400300490000800314520159500322653001401917653002201931653001901953653001701972653001901989100002002008700001802028700001902046700001702065700002502082700001702107856012102124       2011                        eng d  a0021-899500aMagnetic and electric responsive hydrogel-magnetic nanocomposites for drug-delivery application0 aMagnetic and electric responsive hydrogelmagnetic nanocomposites  aCOMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USAbWILEY-BLACKWELLcOCT  a1364-13750 v1223 a<p>Magnetic and electrically responsive hydrogel networks were developed for drug-delivery applications. The hydrogel matrices were synthesized by the polymerization of acrylamide monomer in the presence of carboxymethylcellulose (CMC) or methylcellulose (MC) with N,N-methylenebisacrylamide, a crosslinker with the redox initiating system ammonium persulfate/tetramethylethylenediamine. The magnetic nanoparticles were generated throughout these hydrogel matrices by an in situ method by the incorporation of iron ions and their subsequent reduction with ammonia. A series of hydrogel-magnetic nanocomposites (HGMNCs) were developed with various CMC and MC compositions. The synthesized HGMNCs were characterized with spectral (Fourier transform infrared and ultraviolet-visible spectroscopy), X-ray diffraction, thermal, and microscopy methods. These HGMNCs contained iron oxide (Fe3O4) nanoparticles with an average particle size of about 22 nm, as observed by transmission electron microscopy. The dielectrical properties of the pure hydrogel (HG); the hydrogel loaded with iron ions, or the hydrogel iron-ion composite (HGIC); and the HGMNCs were measured. These results suggest that HGMNCs exhibited higher dielectric constants compared to HG and HGICs. The curcumin loading and release characteristics were also measured for HG, HGIC, and HGMNC systems. These data revealed that there was a sustained release of curcumin from HGMNCs because of the presence of magnetic nanoparticles in the hydrogel networks. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 122: 1364-1375, 2011</p>10ahydrogels10amagnetic polymers10aNanocomposites10ananoparticle10ananotechnology1 aReddy, Narayana1 aMohan, Murali1 aVaraprasad, K.1 aRavindra, S.1 aJoy, Pattayil, Alias1 aRaju, Mohana  uhttps://library.ncl.res.in/content/magnetic-and-electric-responsive-hydrogel-magnetic-nanocomposites-drug-delivery-0