纳米氧化锆多层吸附的模拟及实验研究

Study on the Simulation and Experiment of Nano-Zirconium Oxide in Multilayer Adsorption

采用机械搅拌法制备CTAB-ZrO_(2)、SDS-ZrO_(2)、CTAB-SiO_(2)、SDS-SiO_(2)纳米磨粒,并深入研究了纳米磨粒的包覆机理。推导出任意表面活性剂浓度下吸附量的计算式及多层吸附的Langmuir2-SCA等温方程,由修正的吸附量计算式可得到不同吸附剂浓度下表面活性剂的吸附量,并运用高浓度表面活性剂溶液下的吸附量检验Langmuir2-SCA等温方程的适用性。通过XRD、FT-IR、FE-SEM等测试手段对样品的结构、光学性质和形貌进行表征,并进行定性和定量分析。结果表明:Langmuir2-SCA等温方程可准确地描述高浓度表面活性剂溶液下的吸附量。相比于SDS-SiO_(2)纳米颗粒,CTAB-ZrO_(2)纳米颗粒能吸附更多的表面活性剂、更少的水分子;同时CTAB-ZrO_(2)具有更好的摩擦磨损性能,且微粒呈球状,粒径分布较均匀,包覆性较好。因此,在磁性磨料研磨加工中,选择CTAB-ZrO_(2)作为磨粒较好。

Abrasive particles CTAB-ZrO_(2),SDS-ZrO_(2),CTAB-SiO_(2),SDS-SiO_(2)were prepared by mechanical agitation,the principles of coating of abrasive nanoparticles were deeply studied.In this paper,the calculation formula for the adsorption amount for surfactant solution with any concentrations and the Langmuir2-SCA isothermal equation in multilayer adsorption were derived.Adsorption amount of surfactant at different adsorbent concentrations were obtained from the improved adsorption amount calculation formula,the applicability of the Langmuir2-SCA equation was examined with the adsorption amount for surfactant solution with high concentrations.In addition,the crystalline structures,light absorption pro-perties and morphologies of samples were analysed using XRD,FT-IR,FE-SEM measurement,and the properties of samples were analysed qualitatively and quantitatively.The results showed that the adsorption amount for surfactant solution with high concentrations can be fitted by Langmuir2-SCA isothermal equation;abrasive particles CTAB-ZrO_(2)have more adsorption amount of surfactants than abrasive particles SDS-SiO_(2),and less adsorption amount of water molecules;abrasive particles CTAB-ZrO_(2)have better friction and wear performance,and the coated particles are spherical,the particles size distribution is more uniform,and the coating is dense.Therefore,it is better to choose abrasive particles CTAB-ZrO_(2)in magnetic abrasive grinding.