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首页> 外文期刊>RSC Advances >Morphology and properties of silica-based coatings with different functionalities for Fe3O4, ZnO and Al2O3 nanoparticles
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Morphology and properties of silica-based coatings with different functionalities for Fe3O4, ZnO and Al2O3 nanoparticles

机译：Fe3O4，ZnO和Al2O3纳米粒子具有不同功能的二氧化硅基涂层的形貌和性能

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摘要

A facile single-step method for obtaining 2-3 nm thick silsesquioxane coatings on metal oxide nanoparticles using different carbon-functional silane precursors is presented. Iron oxide nanoparticles with 8.5 nm in diameter were used as a model to evaluate the possibilities of forming different uniform carbon-functional coatings, ranging from hydrophobic to hydrophilic in character. Electron microscopy showed that all the coated nanoparticles could be described as core-shell nanoparticles with single Fe3O4 cores and carbon-functional silsesquioxane shells, without any core-free silicone oxide phase. Steric factors strongly influenced the deposited silicon oxide precursors with octyl-, methyl- or aminopropyl functionalities, resulting in coating densities ranging from 260 to 560 kg m(-3). The methyl-functional coatings required several layers of silsesquioxane, 3-4, to build up the 2 nm structures, whereas only 1-2 layers were required for silsesquioxane with octyl groups. Pure silica coatings from tetraethoxysilanes were however considerably thicker due to the absence of steric hindrance during deposition, allowing the formation of 5-7 nm coatings of ca. 10 layers. The coating method developed for the iron oxide nanoparticles was generic and successfully transferred and up-scaled 30 and 325 times (by volume) to be applicable to 25 nm ZnO and 45 nm Al2O3 nanoparticles.
机译：提出了一种使用不同的碳官能硅烷前体在金属氧化物纳米粒子上获得2-3 nm厚的倍半硅氧烷涂层的简便的单步方法。使用直径为8.5 nm的氧化铁纳米颗粒作为模型来评估形成不同的均匀碳功能涂层的可能性，该涂层的特性从疏水性到亲水性不等。电子显微镜显示，所有涂覆的纳米颗粒都可以描述为具有单个Fe3O4核和碳官能倍半硅氧烷壳，没有任何无核氧化硅相的核壳纳米颗粒。立体因素强烈影响具有辛基，甲基或氨基丙基官能度的沉积氧化硅前驱物，导致涂层密度范围为260至560 kg m（-3）。甲基官能涂料需要几层3-4倍的倍半硅氧烷，以建立2 nm结构，而带有辛基的倍半硅氧烷只需要1-2层。然而，由于四乙氧基硅烷的纯二氧化硅涂层较厚，这是由于在沉积过程中不存在空间位阻，从而允许形成约5nm至约7nm的涂层。 10层。为氧化铁纳米颗粒开发的涂层方法是通用的，已成功转移并按比例放大了30和325倍（按体积计），以适用于25 nm ZnO和45 nm Al2O3纳米颗粒。

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