Iron Oxide Nanoparticles Grafted with Sulfonated and Zwitterionic Polymers: High Stability and Low Adsorption in Extreme Aqueous Environments

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• 作者：Edward L. Foster ; Zheng Xue ; Clarissa M. Roach ; Eric S. Larsen ; Christopher W. Bielawski ; Keith P. Johnston
• 刊名：ACS Macro Letters
• 出版年：2014
• 出版时间：September 16, 2014
• 年：2014
• 卷：3
• 期：9
• 页码：867-871
• 全文大小：276K
• ISSN：2161-1653

文摘

A facile 鈥済rafting through鈥?approach was developed to tether tunable quantities of poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as well as zwitterionic poly([3-(methacryloylamino)propyl]dimethyl(3-sulfopropyl)ammonium hydroxide) (PMPDSA) homopolymer onto iron oxide (IO) nanoparticles (NPs). In this case, homopolymers may be grafted, unlike 鈥済rafting to鈥?approaches that often require copolymers containing anchor groups. The polymer coating provided steric stabilization of the NP dispersions at high salinities and elevated temperature (90 掳C) and almost completely prevented adsorption of the NPs on silica microparticles and crushed Berea sandstone. The adsorption of PAMPS IO NPs decreased with the polymer loading, whereby the magnitude of the particle-surface electrosteric repulsion increased. The zwitterionic PMPDSA IO NPs displayed 1 order of magnitude less adsorption onto crushed Berea sandstone relative to the anionic PAMPS IO NPs. The ability to design homopolymer coatings on nanoparticle surfaces by the 鈥済rafting through鈥?technique is of broad interest for designing stable dispersions and modulating the interactions between nanoparticles and solid surfaces.