Anantharaman, M R; Swapna, Nair S; Mercy, Mathews; Joy, P A; Kulkarni, S D(Elsevier, July 26, 2004)
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Abstract:
Superparamagnetic nanocomposites based on g-Fe2O3 and sulphonated polystyrene have been synthesized by ion
exchange process and the preparation conditions were optimized. Samples were subjected to cycling to study the effect
of cycling on the magnetic properties of these composites. The structural and magnetization studies have been carried
out. Magnetization studies show the dependence of magnetization on the number of ion exchange cycles. Doping of
cobalt at the range in to the g-Fe2O3 lattice was effected in situ and the doping was varied in the atomic percentage
range 1–10. The exact amount of cobalt dopant as well as the iron content was estimated by Atomic Absorption
Spectroscopy. The effect of cobalt in modifying the properties of the composites was then studied and the results
indicate that the coercivity can be tuned by the amount of cobalt in the composites. The tuning of both the
magnetization and the coercivity can be achieved by a combination of cycling of ion exchange and the incorporation of
cobalt
Description:
Journal of Magnetism and Magnetic Materials 283 (2004) 344–352
Anantharaman, M R; Muhammad, Abdul Jamal E; Joy, P A; Philip, Kurian(Springer, December 25, 2009)
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Abstract:
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
Muhammad, Abdul Jamal E; Joy, P A; Anantharaman, M R; Philip, Kurian(Elsevier, January , 2009)
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Abstract:
Nanocomposites based on natural rubber and nano-sized nickelwere synthesized by incorporating nickel
nanoparticles in a natural rubber matrix for various loadings of the filler. Structural, morphological, magnetic
and mechanical properties of the compositeswere evaluated along with a detailed study of dielectric
properties. Itwas found that nickel particleswere uniformly distributed in the matrix without agglomeration
resulting in 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.