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Single phase, uniform size (~9 nm) Cobalt Ferrite (CFO) nanoparticles havebeen synthesized by hydrothermal synthesis using oleic acid as a surfactant.The as synthesized oleic acid coated CFO (OA-CFO) nanoparticles were welldispersible in nonpolar solvents but not dispersible in water. The OA-CFOnanoparticles have been successfully transformed to highly water dispersiblecitric acid coated CFO (CA-CFO) nanoparticles using a novel single step ligandexchange process by mechanochemical milling, in which small chain citric acidmolecules replace the original large chain oleic acid molecules available onCFO nanoparticles. The contact angle measurement shows that OA-CFOnanoparticles are hydrophobic whereas CA-CFO nanoparticles are superhydrophilicin nature. The potentiality of as synthesized OA-CFO and mechanochemicallytransformed CA-CFO nanoparticles for the demulsification of highly stabilizedwater-in-oil and oil-in-water emulsions has been demonstrated.

Transforming Single Domain Magnetic CoFe2O4 Nanoparticles from Hydrophobic to Hydrophilic By Novel Mechanochemical Ligand Exchange