Protection of NiO nanoparticles against leaching in acid medium by grafting of polyacrylic acid

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• 作者：Alej ; ro Ló ; pez-Ortiz ; Virginia H. Collins-Mart&#xed ; nez ; Claudia A. Hern&#xe1 ; ndez-Escobar ; Sergio G. Flores-Gallardo ; E. Arm ; o Zaragoza-Contreras
• 关键词：Open circuit potential ; Nickel oxide ; Metal oxide protection ; Nanocomposite
• 刊名：Materials Chemistry and Physics
• 出版年：2008
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 June 2008
• 卷：109
• 期：2-3
• 页码：306-310
• 文件大小：386 K

摘要

Grafting polyacrylic acid onto the surface of nickel oxide nanoparticles was performed in order to impart to this metal oxide protection against leaching in acid solution (sulfuric acid 0.5 M). Infrared spectroscopy showed the chemical changes implicated in the different stages of the surface treatment. Open circuit potential as a function of time showed to be an excellent technique for characterizing the leaching resistance of the modified nanoparticles. This resistance was attributed to the formation of a layer of polyacrylic acid grafted and physically deposited onto the surface of the nanoparticles, which prevented the direct contact of the acid solution with the nanoparticles avoiding, consequently, leaching.