S band region of electromagnetic spectra is used in versatile applications as in multimedia and communication. Electromagnetic interference makes several electrical, economic, and biological adverse effects. Flexible electromagnetic interference shield from polyaniline-TiO 2 hybrid coated cotton fabric was developed and shielding efficiency of coated fabric was calculated in S band region using cavity perturbation technique. The polyaniline-TiO 2 hybrid coating was done by one-pot method involving in-situ polymerization. The shielding effectiveness due to reflection, absorption, and multiple reflections were estimated and compared for coated fabrics with different polyaniline: TiO 2 ratios. The hybrid coated cotton fabrics had durable electrical conductivity and strength, with good electromagnetic interference shielding in S band region.

A facile method was successfully developed to prepare Ternary oxynitride of iron and gallium. Initially mixed oxyhydroxides of Iron and gallium were prepared by co-precipitation method. Then this was nitrided using urea and agar in presence of ammonia at 900°C, which gave mixed cation oxynitride . This mixed oxynitride was characterized using XRD, XPS and SEM. The X-ray diffraction pattern of the Fex’GaxOyNz phase was refined within the cubic spinel structure (space group Fd-3m), using the fullprof program. On assuming 3+ oxidation state for half of iron and whole of gallium, the chemical composition of the oxynitride spinel determined by the X-ray analysis is Fe2GaN2O2. The refinement using these parameters resulted in a good fit to the observed diffraction data, with a crystallographic R factor of 5.92. This ternary oxynitride of iron and gallium is a novel material which can give unique optical and magnetic properties.