01660nas a2200193 4500008004100000022001400041245011900055210006900174260005700243300001200300490000700312520090000319100002701219700001601246700002501262700001901287700003301306856012701339 2009 eng d a0947-839600aEffect of nickel nanofillers on the dielectric and magnetic properties of composites based on rubber in the X-band0 aEffect of nickel nanofillers on the dielectric and magnetic prop a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcOCT a157-1650 v973 a

Nickel-rubber nanocomposites were synthesized by incorporating ferromagnetic nickel nanoparticles in a natural rubber as well as neoprene rubber matrix. Complex dielectric permittivity and magnetic permeability of these composites were evaluated in the X-band microwave frequencies at room temperature using cavity perturbation technique. The dielectric loss in natural rubber is smaller compared to neoprene rubber. A steady increase in the dielectric permittivity is observed with increase in the content of nickel in both the composites. The magnetic permeability exhibits a steady decrease with increase in frequency and magnetic loss shows a relaxation at 8 GHz. The suitability of these composites as microwave absorbers is modeled based on the reflection loss which is dependant on the real and imaginary components of the complex dielectric permittivity and magnetic permeability.

1 aJamal, Muhammad, Abdul1 aMohanan, P.1 aJoy, Pattayil, Alias1 aKurian, Philip1 aAnantharaman, Maliemadom, R. uhttp://library.ncl.res.in/content/effect-nickel-nanofillers-dielectric-and-magnetic-properties-composites-based-rubber-x-001841nas a2200217 4500008004100000022001400041245009200055210006900147260007300216300001000289490000800299520101600307653002601323653002901349653001901378100002701397700002501424700001901449700003301468856012201501 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

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.

10aDielectric relaxation10aInterfacial polarization10aNanocomposites1 aJamal, Muhammad, Abdul1 aJoy, Pattayil, Alias1 aKurian, Philip1 aAnantharaman, Maliemadom, R. uhttp://library.ncl.res.in/content/synthesis-nickel-rubber-nanocomposites-and-evaluation-their-dielectric-properties-001862nas a2200229 4500008004100000022001400041245008100055210006900136260006900205300001200274490000800286520103800294653002401332653002601356653001501382653002401397100002701421700002501448700001901473700003301492856010701525 2010 eng d a0254-058400aOn the magnetic and dielectric properties of nickel-neoprene nanoconaposites0 amagnetic and dielectric properties of nickelneoprene nanoconapos aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAY a154-1600 v1213 a

Nickel nanocomposites were prepared by incorporating nickel nanoparticles in a neoprene matrix according to a specific recipe for various loadings of nickel particles. The dielectric properties of these composites were evaluated for different frequencies ranging from 100 kHz to 8 MHz at different temperatures from 30 degrees C to 120 degrees C. The dielectric permittivity increases with increase of nickel concentration. Increase in temperature enhances the permittivity initially, till 40 degrees C and thereafter the permittivity decreases. The dielectric loss exhibits relaxation peaks and the peaks shift to lower frequencies with increase in volume fraction of the nickel nanoparticles in the matrix. The evaluation of magnetic and dielectric properties of these composites suggests that the dielectric permittivity can be tailored by an appropriate loading of the filler using semi-empirical equations and the magnetic properties vary according to simple mixture equations. (C) 2010 Elsevier B.V. All rights reserved.

10aComposite materials10adielectric properties10aElastomers10amagnetic properties1 aJamal, Muhammad, Abdul1 aJoy, Pattayil, Alias1 aKurian, Philip1 aAnantharaman, Maliemadom, R. uhttp://library.ncl.res.in/content/magnetic-and-dielectric-properties-nickel-neoprene-nanoconaposites-001869nas a2200229 4500008004100000022001400041245009100055210006900146260005700215300001200272490000700284520104000291653002501331653002001356653002401376653001901400100002701419700002501446700001901471700003301490856011601523 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

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.

10aCure characteristics10aElastic modulus10amagnetic properties10aNanocomposites1 aJamal, Muhammad, Abdul1 aJoy, Pattayil, Alias1 aKurian, Philip1 aAnantharaman, Maliemadom, R. uhttp://library.ncl.res.in/content/magnetic-mechanical-and-rheological-properties-rubber-nickel-nanocomposites-0