接枝磺化和两性离子聚合物的氧化铁纳米颗粒：在极端水性环境中的高稳定性和低吸附性
Iron Oxide Nanoparticles Grafted with Sulfonated and Zwitterionic Polymers: High Stability and Low Adsorption in Extreme Aqueous Environments.
作者信息
Foster Edward L, Xue Zheng, Roach Clarissa M, Larsen Eric S, Bielawski Christopher W, Johnston Keith P
机构信息
Department of Chemistry and §Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States.
Department of Chemistry and Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, United States.
出版信息
ACS Macro Lett. 2014 Sep 16;3(9):867-871. doi: 10.1021/mz5004213. Epub 2014 Aug 18.
A facile "grafting through" 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 "grafting to" 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 °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 "grafting through" technique is of broad interest for designing stable dispersions and modulating the interactions between nanoparticles and solid surfaces.
开发了一种简便的“接枝穿入”方法，将可调量的聚（2-丙烯酰胺基-2-甲基丙烷磺酸）（PAMPS）以及两性离子聚（[3-（甲基丙烯酰氨基）丙基]二甲基（3-磺丙基）氢氧化铵）（PMPDSA）均聚物连接到氧化铁（IO）纳米颗粒（NPs）上。在这种情况下，可以接枝均聚物，这与通常需要含有锚定基团的共聚物的“接枝到”方法不同。聚合物涂层在高盐度和高温（90°C）下为NP分散体提供了空间稳定作用，几乎完全阻止了NP在二氧化硅微粒和破碎的贝雷砂岩上的吸附。PAMPS IO NPs的吸附随聚合物负载量的增加而降低，由此颗粒表面的电空间排斥力的大小增加。相对于阴离子型PAMPS IO NPs，两性离子型PMPDSA IO NPs在破碎的贝雷砂岩上的吸附量低1个数量级。通过“接枝穿入”技术在纳米颗粒表面设计均聚物涂层的能力对于设计稳定的分散体以及调节纳米颗粒与固体表面之间的相互作用具有广泛的意义。
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