vol. 18 / 

Issue 4


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G. D. Gokak, S. M. Bapat, R. M. Kulkarni, S. D. Kulkarni
«Synthesis, Characterization and Structural Study of Untreated and Deep Cryotreated Hybrid Nano-Silica–Iron Oxide»
0919–0928 (2020)

PACS numbers: 47.61.-k, 61.05.cp, 68.37.Hk, 68.37.Lp, 78.30.Hv, 81.07.-b, 81.16.Pr

The present work focuses on synthesizing and deep cryotreatment of hybrid Silica–Iron oxide structure followed by finding out the effect of deep cryotreatment on nanoscale structure of nanoparticles by using x-ray powder diffraction, Fourier transform infrared spectroscopy, field emission gun scanning electron microscopy, transmission electron microscope, Brunauer–Emmett–Teller surface area analysis. Results show that the deep cryotreatment has no effect on the composition of nanostructure; however, the size of nanostructure is shrinking and specific surface area is increased. Hence, porosity is decreased and indicates possible enhancement in thermal conductivity due to an increase in bonding strength. These cryotreated nanostructures can possibly be suspended in various conventional base fluids for all heat-transfer processes with a little compromise on the viscosity of respective base fluids.

Keywords: hybrid nano, deep cryotreatment, XRD, FTIR, FEG–SEM, TEM, B.E.T. surface area
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