Abstract
Highly hydroxylated barium titanate (BaTiO 3) nanoparticles have been prepared via an easy and gentle approach which oxidizes BaTiO 3 nanoparticles using an aqueous solution of hydrogen peroxide (H 2O 2). The hydroxylated BaTiO 3 surface reacts with sodium oleate (SOA) to form oleophilic layers that greatly enhance the dispersion of BaTiO 3 nanoparticles in organic solvents such as tetrahydrofuran, toluene, and n-octane. The results of Fourier transform infrared spectroscopy confirmed that the major functional groups on the surface of H 2O 2-treated BaTiO 3 nanoparticles are hydroxyl groups which are chemically active, favoring chemical bonding with SOA. The results of transmission electron microscopy of SOA-modified BaTiO 3 nanoparticles suggested that the oleate molecules were bonded to the surfaces of nanoparticles and formed a homogeneous layer having a thickness of about 2 nm. Furthermore, the improved dispersion capability of the modified BaTiO 3 nanoparticles in organic solvents was verified through analytic results of its settling and rheological behaviors.
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