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In the present work, Zn-ferrite nanoparticles have been synthesized by chemical co-precipitation method. Prepared samples were characterized by XRD and FTIR to study its structural and chemical properties. The formation of single phase with Fd-3m space group of Zn- ferrite was revealed by XRD and also studied the effect of synthesis techniques on structural parameters. Crystallite size of ZnFe2O4 was found to be 26.11 nm. The FTIR spectra showed two expected bands in the range 550-560 cm1 (i.e. U1) and 400 -410 cm1 (i.e. u2) which confirms the formation of ferrite phase.

This work demonstrates the synthesis of hydrophobic silica aerogels from silicic acid with pH variations by using a costeffective and safe ambient pressure drying process. The work aims to evaluate the effect of pH variation on physicochemical properties of silica aerogels by standard techniques. In the present investigation, we have selected hexane as the solvent and trimethylchlorosilane/hexane was used to perform the surface modification of wet gel in order to elude the contraction and disintegration of gel association subsequent to a drying process. The effect pH on gelation in the form hydrolysis and condensation as well as on amorphous structure, physical properties such as density, thermal stability, surface area, pore-volume, pore radius, optical transmittance were investigated. FTIR spectroscopy was used to confirm the silylation (surface modification) of the prepared silica aerogel samples. Water contact angles were measured to verify the hydrphobic behaviour of all the samples. Among the prepared pH varied samples, the sample having pH ~ 5 shows better results such as high optical transmittance, thermal stability, hydrophobicity and high surface area.

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