文献类型：期刊文献

英文题名：Preparation and characterization of core-shell monodispersed magnetic silica microspheres

作者：Zhu, Yihua[1]; Da, Hong[1]; Yang, Xiaoling[1]; Hu, Ying[2]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China

年份：2003

卷号：231

期号：1-3

起止页码：123

外文期刊名：COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS

收录：;EI(收录号：2004058001248);WOS:【SCI-EXPANDED(收录号:WOS:000188806000011)】；

语种：英文

外文关键词：core-shell particles; polyelectrolyte; magnetic microspheres; silica; layer-by-layer

摘要：Core-shell monodispersed magnetic silica microspheres with tailored dimensions and compositions have been fabricated by consecutively assembling magnetite (Fe3O4) nanoparticles and polyelectrolyte onto silica microspheres. The layers were deposited under conditions where Fe3O4 and poly (diallyldimethylammonium chloride) (PDADMAC) are oppositely charged, thereby utilizing electrostatic attractions for multiplayer buildup. The alternating xi-potentials and transmission electron microscopy (TEM) measurements provided direct evidence of the stepwise multilayers growth, and the elemental Auger electron spectroscopy (AES) depth profile of core-shell magnetic silica microspheres indicate that the contents of Fe and C decrease but the contents of Si and O increase with sputtering. The fabrication of these magnetic silica microspheres is expected to produce novel particles with potential applications in various fields of materials science and biotechnology. (C) 2003 Elsevier B.V. All rights reserved.