纳米SiO_2分散稳定性能影响因素及作用机理研究  

Effect Factor and Function Mechanism on Dispersion and Stability of SiO_2 Nanoparticles

作　　者：宋晓岚[1] 吴雪兰[1] 曲鹏[1] 王海波[1] 邱冠周[1] 

机构地区：[1]中南大学资源生物学院无机材料系,长沙410083

出　　处：《硅酸盐通报》2005年第1期3-7,共5页Bulletin of the Chinese Ceramic Society

基　　金：湖南自然科学基金资助项目(03JJY3015).

摘　　要：通过测定纳米SiO2水悬浮液的Z eta电位和吸光度,探讨了不同pH值、不同表面活性剂种类及浓度对纳米SiO2水相体系分散稳定性的影响,并分析其作用机理。结果表明:Z eta电位与吸光度有良好的对应关系,Z eta电位绝对值越高,吸光度越大,则体系分散稳定越好;pH值、表面活性剂种类及加入量是影响纳米SiO2水相体系分散稳定性的主要因素。pH为9～11之间时,体系Z eta电位绝对值较高,相应分散稳定性较好;非离子、阳离子和阴离子型表面活性剂随浓度变化均可改变体系Z eta电位,从而影响其分散稳定;加入适宜用量3种类型表面活性剂能得到分散稳定的悬浮液体系;若加入阴/非离子表面活性剂复配物,则能进一步提高和改善体系的分散稳定性能。Dispersion and stability of SiO2 Nanoparticles in water were studied under different pH values, different surfactant types and contents by the method of Zeta potential and absorbency, and the function mechanism was analyzed. The results show that Zeta potential has very corresponding relation to absorbency, the higher absolute value of zeta potential and absorbency is, and the better dispersion and stability in system is. The absolute value of zeta potential and the absorbency is higher at pH 9～11.The three kinds of surfactants can change Zeta potential and affect the stability of nano SiO2/ water suspension while their concentration changes. Dispersion and Stability of nano SiO2/ water suspension can be obtaind by adding certain dosage surfactant. When a complex of anionic and nonionic surfactants is added to nano SiO2/water suspension,the system has better dispersion and stabilization.

关 键 词：分散稳定性 纳米SiO2 ZETA电位 表面活性剂 复配物 加入量 水悬浮液 影响 改变 作用机理 

分 类 号：TQ423.11[化学工程] TQ127.11