摘要
通过多重光散射法研究了纳米Ti O_2水分散体系稳定性的影响因素。探讨了分散剂类型、p H和Na Cl质量浓度对水分散体系稳定性的影响规律以及分散剂对纳米Ti O_2颗粒在分散液中粒径变化、沉降的微观作用特性。结果表明：纳米Ti O_2颗粒的粒径在100~200 nm时易相互吸附团聚沉降,分散剂会在纳米Ti O_2颗粒表面吸附形成双电层,产生更大的Zeta电位负值,增强颗粒间的排斥作用,减缓粒径增长和颗粒沉降,从而提升分散液的稳定性;纳米Ti O_2颗粒的较佳分散条件为：w（六偏磷酸钠）=0.05%,p H=9~10且不加电解质Na Cl;多重光散射法与传统的吸光度测试实验所得结果基本相符。
Factors that affecting the stability of nano- Ti O_2 aqueous dispersion system were studied using multiple light scattering technique. Affecting rule with respect to type of the dispersing agent,the p H value and electrolyte mass concentration as well as the dispersing agent for microscopic action characteristics of particle size change and settlement of Ti O_2 particles in aqueous dispersion was examined. The results showed that nano- Ti O_2 particles between 100 to 200 nm is more easily to settle due to mutual adsorption and aggregation.The dispersing agent will be adsorbed on surface of nano- Ti O_2 particles and forming double electric layer;generating higher Zeta potential negative value; resulting in the enhancement of the repulsion forces between particles; thereby retarding the increase of particle size and settling migration of the particles. Subsequently,the stability of the dispersion increases. The optimal dispersion conditions are recommended as using sodium hexametaphosphate with a mass fraction of 0. 05%,keeping the p H value within 9 to 10 and without addition of Na Cl. The results obtained with multiple light scattering technique is basically conformed to that obtained from the conventional absorbance tests.
出处
《日用化学工业》
CAS
CSCD
北大核心
2016年第7期409-413,共5页
China Surfactant Detergent & Cosmetics
基金
国家自然科学基金资助项目(21273286)
中国石油大学(北京)科研基金资助项目(2462015YJRC033)
