The progress of green chemistry in the synthesis of nanoparticles with use of plants has engrossed a great attention nowadays due to its inexpensive, simple, non-toxic and environmentalfriendly nature. The present study has been undertaken to prepare Azadirachta indica gum stabilized ZnO nanoparticles with multifunctional properties. The prepared nanoparticles were characterized by FT-IR, XRD, FE-SEM and UV-Vis absorption studies. It was clear from XRD pattern that nanoparticles were crystallized in hexagonal wurtzite structure. The average size of the nanoparticles was found to be 30-60nm. The synthesized nanoparticles exhibited potent antibacterial activity against E. coli and S. aureus.

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The present work deals with the corrosion behavior of mild steel in acidic medium. The inhibitive effect of substituted 1, 3, 4-Thiadiazol-2-amines on the corrosion of mild steel in 1 M H2SO4has been studied by weight loss and electrochemical methods. The electrochemical parameters for mild steel in acidic solution with and without inhibitor were calculated. The effect of temperature on the corrosion rate, activation energy and free energy of adsorption were also calculated. The synergistic effect has been studied by weight loss and electrochemical methods. The electrochemical parameters for mild steel in acidic solution were also calculated.

S-Benzyl isothiouronium chloride single crystals were grown at room temperature by slow evaporation solution growth technique. Single crystal X-ray diffraction study has been carried out to find the crystal system and unit cell parameters. Various functional groups present in the grown material have been identified using FTIR spectra. The transparency of crystal was tested using UV-visible spectra. The grown crystal exhibits second harmonic generation (SHG). TGA/DTA analysis also carried out.

Moringa oleifera gum exudate a non-toxic organic compound, is introduced as a synergist to 3,5-Dimethyl-2,6-diphenylpiperidin-4-one and the corrosion inhibition of mild steel in the Hydrochloric acid medium is studied using weight loss method, potentiodynamic polarization and electrochemical impedance spectroscopy. Results show that 3,5-Dimethyl-2,6-diphenylpiperidin-4-one alone provided an average inhibition of the corrosion of mild steel and it was found that the inhibition efficiency increased synergistically in the presence of Moringa oleifera gum exudate. The inhibition efficiency increased with increase in the concentration of the inhibitor but decreased with a rise in temperature. Polarization studies reveal that the inhibitor system is of a mixed type. Impedance studies point out that a protective film is formed on the mild steel surface in the presence of the inhibitor. Fourier transform infrared spectroscopy and scanning electron microscopy studies were used to investigate the nature of protective film formed on the mild steel surface.