材料科学
纳米颗粒
涂层
超声
超顺磁性
化学工程
悬挂(拓扑)
氧化铁纳米粒子
降水
纳米技术
磁化
量子力学
磁场
物理
工程类
气象学
数学
纯数学
同伦
作者
Bashiru Kayode Sodipo,Azlan Abdul Aziz
出处
期刊:Materials Science Forum
日期:2013-05-01
卷期号:756: 74-79
被引量:22
标识
DOI:10.4028/www.scientific.net/msf.756.74
摘要
Superparamagnetic iron oxide nanoparticles (SPION) of sizes 5 to10 nm were synthesized by the co-precipitation method. They are coated with silica nanoparticles using sonication method. The SPION was produced under the optimum pH of 10, peptized in acidic medium and redispersed in water. The silica nanoparticles were produced through the Stöbermethod. Sonochemical coating of silica nanoparticle on the SPION was successfulat a pH value lower than 5. Otherwise, at higher pH value (but lower than point zero charge (PZC)), the SPION were found to be unstable. Fast hydrolysis of triethoxyvinylsilane(TEVS) shows that silica forms its own particles without coating onto the surfaces of the SPION. Under optimized experimental condition, sonochemical method of coating silica nanoparticles onto the SPION can be considered as an alternative for effective and prompt method that rely mainly on pH of the suspension.
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