Magnetic nanoparticles with functional silanes: evolution of well-defined shells from anhydride containing silane.

Xinlei Huang, Abrin Schmucker, Jason Dyke, Sara M Hall, John Retrum, Barry Stein, Nicholas Remmes, David V Baxter, Bogdan Dragnea, Lyudmila M Bronstein
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引用次数: 53

Abstract

Modification of iron oxide nanoparticles (NPs) synthesized by high temperature solvothermal routes is carried out using two silanes: (i) N-(6-aminohexyl)-aminopropyltrimethoxysilane (AHAPS) where only one end of the molecule reacts with the surface Fe-OH groups and (ii) 3-(triethoxysilyl)propylsuccinic anhydride (SSA) where both ends are reactive with Fe-OH. Depending on the NP synthesis protocol, the amount of surface OH groups on the NPs may differ, however, for all the cases presented here, the comparatively low OH group density prevents a high density of AHAPS coverage, yielding NP aggregates instead of single particles in aqueous solutions. Alternatively, use of SSA containing two terminal functionalities, anhydride and siloxy, which are both reactive towards the NP surface, results in the formation of discrete dense polymeric shells, providing stability of individual NPs in water. The mechanism of the SSA shell formation is discussed. The evolution of the chemical transformations leads to shells of different thickness and density, yet this evolution can be halted by hydrolysis, after which the NPs are water soluble, negatively charged and exhibit excellent stability in aqueous media.

具有功能硅烷的磁性纳米颗粒:从含有硅烷的酸酐演变成定义良好的壳。
使用两种硅烷对通过高温溶剂热途径合成的氧化铁纳米颗粒(NP)进行改性:(i)N-(6-氨基己基)-氨基丙基三甲氧基硅烷(AHAPS),其中分子的一端仅与表面Fe-OH基团反应;(ii)3-(三乙氧基甲硅烷基)丙基琥珀酸酐(SSA),其中两端均与Fe-OH反应。根据NP合成方案,NP上表面OH基团的量可能不同,然而,对于本文所述的所有情况,相对较低的OH基团密度阻止了AHAPS覆盖的高密度,从而在水溶液中产生NP聚集体而不是单个颗粒。或者,使用含有酸酐和甲硅烷氧基两种末端官能团的SSA,这两种官能团都对NP表面具有反应性,导致形成离散的致密聚合物壳,从而提供单个NP在水中的稳定性。讨论了SSA壳层的形成机理。化学转化的演变导致不同厚度和密度的壳层,但这种演变可以通过水解来停止,之后NP是水溶性的,带负电,并且在水性介质中表现出优异的稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Materials Chemistry
Journal of Materials Chemistry 工程技术-材料科学:综合
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1.5 months
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