摘要
采用化学修饰方法,以二氧化硅为内层修饰材料,r-氨丙基三甲氧硅烷(APS)偶联剂为外层修饰材料,对磁性ZnFe2O4纳米粒子进行了双层修饰。并采用XRD、IR、Zeta电位对未包裹粒子,二氧化硅包裹的磁纳米粒子,APS和二氧化硅双层包修饰的纳米磁粒进行表征。同时也比较了三种粒子的耐酸性能。结果显示硅包裹的纳米磁粒Zeta电位明显向酸性方向移动,而双层的纳米磁粒Zeta电位向碱性方向移动。包裹的纳米磁粒在pH2.0的酸中具有很好的耐酸性能,而未处理的纳米粒子在酸溶液中发生了溶解。
A bilay-modifying technique was reported. ZnFe2O4 nanoparticles were coated with silica first, and then modified by APS. The characterizations of ZnFe2O4, SiO2-coated ZnFe2O4 and bilay-modified （SiO2/APS） ZnFe2O4 nanoparticles were investigated using X-ray diffraction （XRD） , Infrared Spectroscopy （IR） , Zeta-potential measurement. And acid resistance of these samples was compared. Results showed the isoelectric point （pI） of SiO2- coated ZnFe2O4 nanoparticles moves to acidic region. The pI of bilay-modified ZnFe2O4 nanoparticles moves to basic region and.these nanoparticles had tremendous durability in acid solution at pH 2.0 While the untreated particles are corroded in acid solution.
出处
《精细化工中间体》
CAS
2007年第3期51-53,69,共4页
Fine Chemical Intermediates
基金
国家高技术研究发展计划(863计划)资助项目(2001AA218011)。
关键词
铁酸锌
纳果
二氧化硅
APS
耐酸性
Zn ferrites
nanoparticles
silicon dioxide
APS
acid resistance
