摘要
采用正硅酸乙酯(TEOS)水解法在羟基磷灰石粉体表面包覆SiO2进行表面改性,并通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、红外(FT-IR)、zeta电位和沉降实验等对样品的晶体结构、颗粒形貌进行了表征,结果表明涂层厚度约为3nm,包覆后的纳米粒子在水溶液中的胶体稳定性提高了5倍,SiO2在羟基磷灰石表面的吸附符合异质凝结机制。
Nanophase hydroxyapatite(HAP) particles were coated with silica via the hydrolysis of tetraethyl orthosilicate(TEOS).The nanocomposite particles were characterized by transmission electron spectroscopy(TEM),scaning electronmicroscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared(FT-IR) spectroscopy,sedimentation timeand zeta potential(ζ) studies.A sequential changes in infrared spectral features characteristic of HAP was accompanied by an increase in features characteristic of silica as revealed by FT-IR.The silica coating enhanced the colloidal stability of HAP in aqueous suspensions.This behavior can be explained based on a heterocoagulation coating mechanism in which silica clusters adsorb onto the HAP particle surface.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2012年第11期1434-1437,1442,共5页
Journal of Functional Materials
基金
广东省科技攻关资助项目(2010B031100002)