One-pot Synthesis of Oil Dispersible Ultra Fine Manganese (II) Oxide Nanoparticles

Yandrapalli, Naresh; Rajan, K.S
November 2012
Asian Journal of Scientific Research;2012, Vol. 5 Issue 4, p228
Academic Journal
Nanoparticles have attracted lot of attention for their exceptional properties which are different from those of materiais in bulks. Metal oxides have shown application in many domains of science. Especially, manganese oxide has proven applications in energy storage, sensors, imaging technologies and even biomedicine. But, synthesis of ultrafine monodisperse nanoparticles that can be dispersed easily in polar or non-polar solvent is of prime importance for applications involving composites, phase change energy material, thermal management etc. We report the synthesis of ultrafine monodisperse MnO nanoparticles from manganese acetate tetrahydrate by a solvothermal method. Surfactants, oleie acid and 1-octadecene were used in suitable concentrations to yield oleie acid stabilized manganese oxide nanoparticles. The formation of manganese-oleate complex in the first step was confirmed using FTIR. X-ray diffraction spectra confirmed the formation of manganese oxide. Scanning and Transmission Electron Micrographs established the size of nanoparticles to be in the range of 15-20 nm. Crystalline nature of the nanoparticles was confirmed using selected area electron diffraction. Aging time has been found to influence the size of the nanoparticles, with layer particle sizes obtained for higher aging periods. These nanoparticles are suitable for dispersion in non-polar solvents and in thermic fluids like Therminol 55 resulting in nanofluids.


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