Abstract:

Nano-Y₂O₃ was prepared by the precipitation method with polyvinyl alcohol as dispersant, and the nano-Y₂O₃was modified by stearic acid.Surface morphology， microstructure and lipophilic performance of nano-Y₂O₃ and modified nano-Y₂O₃ were characterized by XRD，IR，TG-DTA and TEM.The results showed that the phase and grain size of Y₂O₃ did not change after modification, and a covalent bond was formed between the hydroxyl of Y₂O₃ surface and carboxyl of stearic acid. An organic coating was formed on nano-Y₂O₃ and the polarity of nano-Y₂O₃ was changed from hydrophilicity to hydrophobicity.The lipophilic degree of modified nano-Y₂O₃ powder was up to 70.79%, under the condition of  mass ratio of nano-Y₂O₃ to stearic acid 10∶2, pH 6.0 and modification time 120 min.