纳米SiO2粉体新型表面活性剂复合改性工艺研究

为了降低纳米二氧化硅的亲水性,提高其亲油性,从而充分发挥其纳米效应,基于纳米SiO2颗粒的自身特性,针对一种新的表面改性工艺进行了试验研究,即Ba2 预活化 阴离子型表面活性剂复合改性,并利用透射电镜、X射线和红外光谱、沉降体积等方法和手段对改性后SiO2性能进行了表征.结果表明,利用该新型复合改性工艺对纳米SiO2颗粒具有一定的改性效果,改性后粉体能在特定有机溶剂中稳定分散,其中Ba2 预活化 十二烷基磺酸钠改性效果相对较好.

Composite Modification New-style Surface Active Agent for Nano-sized SiO2

In order to reduce the hydrophilicity and increase the hydrophobicity of nano-sized SiO_2,and make full use of its nano advantage,based on the character of nano-sized SiO_2,nano-sized SiO_2 is modified by a new means of surface modification,namely activating by Ba~(2+) in advance and then modified by the surface active reagent of the negative ion type.TEM,XRD,IR and sedimentation volume have been used to investigate the surface character of nano-sized SiO_2.The research results show that the character of nano-sized SiO_2 is improved to a certain degree after being modified by this way and the modified nano-sized SiO_2 can be stably dispersed in given organic solvent.Nano-sized SiO_2 modified like this,Ba~(2+) activating in advance and then modified by sodium dodecyl sulfonate,have a better surface character.