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采用超分散剂对纳米TiO2粉体进行表面改性,可将超分散剂分子成功地包覆于TiO2表面,对TiO2表面进行非极性修饰,使其表面由极性亲水性变为非极性亲油性。由沉降性实验观测到超分散剂改性后的纳米TiO2粒子可在非极性溶液中稳定悬浮960h以上;透射电镜(TEM)观测到改性后的TiO2粒子在非极性溶剂中呈纳米级分散状态,团聚体的粒径基本控制在100nm以内;通过润湿性测试及红外分析观察到,颗粒表面由亲水性变为疏水性,纳米TiO2颗粒表面增加了-CH2-和C=O-O基团键的振动峰,因而可以判断纳米TiO2表面状态发生了改变,使TiO2与非极性材料具有较好亲和相容性。本实验也证明了TiO2表面亲油改性的可行性。
Adopting the hyperdispersant to modify the surface of the nano-TiO2 powder, the hyperdispersant molecules can be successfully coated on the surface of TiO2, and the surface of the nano-TiO2 can be modified nonpolarly so that its surface is changed from polar hydrophilic to non-polar Lipophilicity. The TiO2 nanoparticles modified by hyperdispersant were observed in the sedimentation experiment for more than 960h in non-polar solution. The TEM images showed that the modified TiO2 particles were nanoscale in non-polar solvent Dispersed state, the particle size of aggregates is basically controlled within 100nm; wettability test and infrared analysis showed that the surface of the particles changed from hydrophilic to hydrophobic, the surface of the nano-TiO2 particles increased by -CH2- and C = OO Group bond vibration peak, which can determine the state of nano-TiO2 surface has changed, so that TiO2 and non-polar materials have good affinity and compatibility. This experiment also proves the feasibility of lipophilic modification of TiO2 surface.