Abstract
A one-step chemical method has been developed for the preparation of stable, non-agglomerated silver nanofluids. Silver nanofluid is prepared by using silver nitrate as a source for silver nanoparticles, distilled water as a base fluid, and sodium borohydride and hydrazine as reducing agents by means of conventional heating using polyvinylpyrrolidone (PVP) as surfactant. This is an in situ, one-step method that seems to be valuable with high yield of product with less time consumption. The characterization of the nanofluid is done by particle size analyzer, X-ray diffraction topography, UV-visible absorption spectroscopy, and transmission electron microscopy followed by the study of thermal conductivity of nanofluid by the transient hot wire method. The results show that Ag-water nanofluids with low concentration of nanoparticles, i.e., below 1000 ppm, have noticeably higher thermal conductivities than the water base fluid without Ag. Moreover, the amount of PVP in silver nanofluid can have a significant effect on magnitude and behavior of the thermal conductivity enhancement.
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