Surface Modification of Nano TiO2 Powders by Dielectric Barrier Discharge Plasma Assisted Ball Milling
WEI Yukun1, 2, LIAO Haifeng1, 2, YAN Haitao1, 2, WU Xiaole3, DAI Leyang1, 2
1 Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, School of Marine Engineering, Jimei University, Xiamen 361021, China 2 Fujian Shipping Research Institute of Jimei University, Xiamen 361021, China 3 Jiujiang Military Representative Office of the General Armament Department, Jiujiang 332000, China
Abstract: In order to improve the dispersive stability of nano TiO2 powders in lubricating oil, several surface modifiers, such as stearic acid, oleic acid, quaternary ammonium salt/sodium laurate and so on, have been selected to prepare surface modified nano TiO2 powders by dielectric barrier discharge plasma assisted ball milling for 11 h. These prepared samples were analyzed by SEM, FT-IR, XPS, XRD, TG-DSC and lipophilic degree. The results show that the particle size of TiO2 powder prepared by ball milling is between 50—200 nm. The crystallite size decreases by 12%—68% and the lattice distortion increases significantly. The nano TiO2 powders are in situ modified by lipophilic groups -CH2 and -CH3 in the modifier on the surface. The lipophilicity of modified nano TiO2 powders has been improved dramatically because of stable covalent chemical bonds formed by the chemical reaction between carboxylic acids in organic compounds and hydroxyl groups on the surface of TiO2, which results in the improvement of dispersion stability of nano TiO2 in lubricating oil. In the ball milling assisted by high-energy plasma, the rapid heating effect of plasma is one of the main reasons for promotion of the TiO2 powder refinement, improvement of the powder activity and effect of the surface modification.
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2020, Vol. 34 
