聚丙烯酸钠对纳米SiO_2分散稳定性能的影响  

Effect of PAAS on Dispersion Stabilization of SiO2 Nanoparticles

作　　者：牛永效[1] 王毅[2] 王恩德[1] 付建飞[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]东北大学理学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2008年第11期1641-1644,共4页Journal of Northeastern University(Natural Science)

基　　金：辽宁省自然科学基金资助项目(20072029)

摘　　要：选择了聚丙烯酸钠(PAAS)作为分散剂,并通过激光粒度分析仪对纳米颗粒的分散稳定性进行评价,通过红外光谱仪对分散剂在颗粒表面的吸附状态进行识别.发现聚丙烯酸钠能够显著提高纳米SiO2颗粒的分散稳定性,但是,当聚丙烯酸钠的添加量过大而达到过饱和时,反而会造成体系中纳米颗粒分散稳定性的降低;对于相同质量分数的聚丙烯酸钠,低pH值增加了纳米SiO2颗粒与聚丙烯酸钠形成氢键的几率,促进了聚丙烯酸钠在纳米SiO2颗粒表面上的吸附,纳米颗粒的分散稳定性提高.PAAS（polyacrylate acid sodium） was selected as dispersant to evaluate the dispersion stabilization of SiO2 nanoparticles by a diffraction-based laser granulometric analyzer and identify the state of adsorption of the dispersant on the surface of nanoparticles by an IR spectrometer. The results indicated that adding PAAS can remarkably improve the dispersion stabilization of SiO2 nanoparticles in aqueous solution but degrade it if the added amount of PAAS is oversaturated. If the mass fraction of PAAS remains unchanged, the low pH value of suspension will increase the probability to form the hydrogen bond between SiO2 nanoparticles and PAAS, thus stimulating the adsorption effect of PAAS on the surface of SiO2 nanoparticles so as to improve their dispersion stabilization.

关 键 词：SiO2纳米颗粒 分散稳定性 聚丙烯酸钠 粒度分布 分散剂 

分 类 号：C931[经济管理—管理学]