阴离子型水性超分散剂对纳米TiO_2的表面改性  

Surface Modification of Nanosized TiO_2 by Aqueous Anionic Hyperdispersant

作　　者：王伟 冯晓健[1] 胡华国[1] 

机构地区：[1]南京师范大学化学与环境科学学院

出　　处：《南京师范大学学报（工程技术版）》2008年第2期51-55,共5页Journal of Nanjing Normal University(Engineering and Technology Edition)

基　　金：南京大学固体微结构物理国家重点实验室基金(M05010)资助项目

摘　　要：为制备稳定分散的纳米TiO2水悬浮液,采用自制的阴离子型水性超分散剂对纳米TiO2进行表面改性,使用红外、紫外、扫描电镜、沉降实验、黏度测试等方法对钛白粉的分散性进行表征.结果表明,阴离子型水性超分散剂能成功地包覆于粉体表面;经超分散剂改性后粒子基本无团聚现象,平均粒径在100 nm以内;在pH=9时,能使TiO2较好地分散于水溶液中,完全沉降时间达到了1 152 h以上,分散性能较改性前大大提高.Nanosized TiO2 was modified by water-based anionic hyperdispersant in order to obtain steady nanosized TiO2 aqueous suspension. IR, UV, SEM, sedimentation experiment, viscosimetry were used to characterize the dispersibility of TiO2. The results showed that the hyperdispersant was adsorbed onto the TiO2 surface successfully; the SEM showed that there was no agminated modified TiO2 particles and the whole average size was less than 100 nm; the nanosized TiO2 aqueous suspension was very stable at pH value 9, the modified nanosized TiO2 can be steadily suspended for 1 152 h in water solvent, compared with the pre-modified TiO2 the dispersibility was increased greatly.

关 键 词：阴离子型 超分散剂 纳米TiO2 分散性 

分 类 号：TQ314.24[化学工程—高聚物工业]