Abstract
Hydrophobic BaSO 4 nanoparticles were successfully produced via a one-step process through precipitation reaction in aqueous solution of BaCl 2 and (NH 4) 2SO 4 with octadecyl dihydrogen phosphate ( n-C 18H 37OPO 3H 2, ODP) as a modifying agent. The ODP was used to control the BaSO 4 particle size and to modify the surface property of the particles produced from the precipitation. Measurements of relative contact angle and active ratio indicated that BaSO 4 samples were hydrophobic. The samples were characterized by using field emission scanning electron microscope, transmission electron microscopy, X-ray diffraction, infrared analysis, thermogravimetric analysis and energy dispersive X-ray analysis. The results suggested that the hydrophobic property was attributed to presence of a thin layer of barium alkyl phosphates, which was formed and coated onto the surface of BaSO 4 particles during the reaction process. The thin films at the surface of the BaSO 4 modified the surface property and control the particle size and morphology.
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