摘要
采用在制备过程中添加聚电解质型分散剂聚乙烯亚胺(PEI)和在制备好的纳米SiO2空心颗粒水悬浮液中添加PEI并球磨这两种方法对纳米SiO2空心颗粒进行分散,并对这两种方法进行了比较,最后采用以PEI作为分散剂,利用球磨工艺,对已制备的纳米SiO2空心颗粒水悬浮液进行分散的方法,研究了PEI在纳米SiO2空心颗粒表面的吸附行为及水悬浮液的分散稳定性。结果表明,PEI在纳米SiO2空心颗粒表面的吸附提高了颗粒间的排斥势能,改善了纳米SiO2空心颗粒的团聚问题及其悬浮液的稳定性。并阐明了加入PEI后纳米SiO2空心颗粒表面ζ电位的变化趋势、不同pH值下PEI在纳米SiO2空心颗粒表面的吸附量与其加入量的关系等。
Two different methods were applied to disperse the hollow silica nanoparticles （HSNP） with polyethylenimine （PEI） as the dispersant. One method is that the PEI is used as dispersant during the preparation process of the HSNP, while the other is that, after preparing the HSNP, the PEI is added in the suspension of prepared HSNP and then the suspension undergoes milling treatment to achieve the desired dispersion. The results show that adding PEI during preparation of HSNP have no noticeable improvement for the dispersion, while adding PEI into the suspensions of prepared HSNP and undergoing milling treatment result in remarkable dispersion improvement. Therefore, the later one was chosen as the measure to disperse the HSNP suspensions. The absorption of PEI on the surfaces of HSNP and the stability of the aqueous suspensions were investigated. The results indicate that the adsorption of PEI on the surfaces of HSNP would increase the repulsive energy among particles; hence it will reduce the agglomeration of HSNP and improve the stability of its aqueous suspensions. The change tendency of the zeta potential ζ on the HSNP surfaces after adding PEI and the relationship between the adsorbed amount of PEI and pH were also illustrated.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2006年第5期752-758,共7页
Journal of Chemical Engineering of Chinese Universities
基金
教育部新世纪优秀人才支持计划(NCET-04-0123)
国家自然科学基金(20325621
20506001)
国家攻关计划(2004BA308A25-16)
国家"863"计划(2003AA302620)
北京市教委资助项目(JD100100403)
教育部留学回国人员科研启动基金资助课题。
关键词
纳米SiO2空心颗粒
分散性
聚乙烯亚胺
Ζ电位
吸附
hollow silicanano-particles （HSNP）
dispersion
polyethylenimine （PEI）
potential
adsorption
