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Jodhpur, India

Rajput A.B.,Birla Institute of Technology and Science | Rahaman S.J.,Birla Institute of Technology | Sarkhel G.,Birla Institute of Technology | Patra M.K.,Defense Laboratory | And 2 more authors.
Polymer - Plastics Technology and Engineering | Year: 2013

A simple method for the preparation of magnetic nanocomposites consisting of NiFe2O4 nanoparticles, polybenzoxazine (PB), linear low-density polyethylene (LLDPE) and LLDPE-g- Maleic anhydride (LgM) is described. Composites were prepared by forming benzoxazine- NiFe2O4 nanocomposites followed by melt blending with LLDPE and thermal curing of benzoxazine. The composites were characterized by XRD, DSC and TGA, FT-IR, SEM, UTM and VSM. The saturation magnetization of the composites containing 33.25 wt% NiFe2O4 was 7.72 emu/g and it decreased with decreasing amount of NiFe2O4 in the composite. The composite films exhibited mechanical flexibility as well as magnetic properties. © 2013 Copyright Taylor and Francis Group, LLC. Source

Shukla A.,Defense Laboratory | Shukla R.K.,Defense Laboratory | Patra M.K.,Defense Laboratory | Jani R.K.,Defense Laboratory | And 3 more authors.
International Journal of Green Nanotechnology: Biomedicine | Year: 2012

Core-shell material with hollow cenospheres of low density as the core has been synthesized by depositing a layer of iron oxide shell on the surface of seed hollow cenospheres. The phase structure, morphology, particle size, chemical composition, and magnetic properties of the synthesized material have been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), and vibrating sample magnetometer (VSM). Results confirm the coating of iron oxide on hollow cenospheres. Electromagnetic characterization of synthesized core-shell material was carried out in X band. Dilectric loss (tanδe) and magnetic loss (tanδm) were found in the range of~0.2 and 0.05, respectively, over 8-12 GHz. Simulation studies show the effective reflection loss (RL) is more than 10 dB over frequency range 9-10.5 GHz at a thickness of 2.2 mm. The low density iron oxide coated cenospheres have potential applications as microwave absorbing materials. © Taylor & Francis Group, LLC. Source

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