Surface Modification of Nano-Al2O3 with Stearic Acid

Surface modification of nanoAl₂O₃ with stearic acid by dry method was researched. The structures of nanoAl₂O₃ before and after modified were characterized by IR. The modification effect on nanoAl₂O₃ was measured with the activation index. In addition, the influence factors of modifier dosage, modification time and modification temperature were also discussed. The results showed that nanoAl₂O₃ had been successfully modified with stearic acid. The hydrophily and lipophilicity experiments indicated that modified nanoAl₂O₃ possessed lipophilicity property and could disperse in xylene. The optimal conditions of modification were as follows: the stearic acid was 7.5 wt%, based on the quality of nanoAl₂O₃, modification time was 50 min and temperature was 150 ^○C.