The super-paramagnetic particles of large surface area with controlled size Fe2O3 nanoparticles are synthesized by addition of reducing agents along with green capping agents via Co-precipitation method which is one of the simplest and productive method to synthesize such nano-particles in large quantities. ?-Fe2O3 NPs so-obtained as confirmed by XRD were further characterized by various analytical techniques like UV-Visible, and FT-IR Spectroscopy, SEM/EDX and PSA. Nanocomposite films of very small thickness are fabricated by blending capped and uncapped Fe2O3 nanoparticles in PVA matrix at different loading concentration and their shielding efficiency is studied using Vector Network Analyzer (VNA) in the X-band frequency (8.2-12.4 GHz) and Ku-band frequency (12.4-18 GHz). EMI SE in Ku-band was maximum for capped Fe2O3 NPs PVA film with value of -13.06 dB, better than uncapped Fe2O3 NPs/PVA film.

The limit sorption capacity of active carbon layers with grafted ethanolamine, sodium or potassium glycinate derivatives of PVC with different fractions of components formed on a PVC film was measured under sorption of saturated benzene and water vapor. Sorbents are considered as systems with two porous phases chemically bounded at the interface. The compound to be sorbed is absorbed from the outside by the polymer with the formation of molecular complexes with PVC derivatives and through it passes into carbon to establish the equilibrium state of the distribution under conditions of maximum saturation of the polymer. It is shown that the amount of benzene and water in carbon is less than its capacity. It depends on the nature of the radicals in the PVC derivatives.

Synthesis of Fe3O4 nanoparticles was carried out by ascorbic acid mediated reduction of Fe(acac)3. In order to achieve control over size, synthesis was carried out at different synthesis conditions. Small (8 nm, 9 nm and 15 nm), medium (22 nm, 29 nm, 33 nm and 42 nm) and large (76 nm, 108 nm) sized Fe3O4 nanoparticles have been synthesized by varying and controlling the experimental conditions. Mechanism for the formation of Fe3O4 nanoparticles is proposed. Our method is observed to yield reproducible results, confirmed by doing the repeated synthesis several times.