Synthesis and Characterization of Mesoporous Sodium Dodecyl Sulfate-Coated Magnetite Nanoparticles
Synthesis and Characterization of Mesoporous Sodium Dodecyl Sulfate-Coated Magnetite Nanoparticles
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DOI：
10.4416/jcst2011-00021
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发表时间：
2011-12-01
影响因子：
0.5
通讯作者：
Greish, Y. E.
中科院分区：
文献类型：
--
作者：
El-kharrag, R.;Amin, A.;Greish, Y. E.
介孔磁铁矿纳米颗粒通常用于生物医学和环境应用。这可以归因于它们已知的磁性和高表面积，后者是它们纳米级尺寸的优点。将具有各种化学功能的涂层施加到这些纳米颗粒上增加了它们的应用范围。已经探索了不同的有机和无机涂层。十二烷基硫酸钠（SDS）是一种众所周知的表面活性剂，可改善纳米颗粒的表面性质。本文探讨了在空气中通过传统的共沉淀法制备的介孔磁铁矿纳米粒子表面原位形成SDS涂层。涂层由含有高达2重量%的SDS的溶液中进行了研究，在其组成，热特性，和磁化通过X-射线衍射，红外光谱，热重分析和磁化率。吸附等温线和详细的包覆纳米粒子的形态进行了评价。结果表明，SDS与水一起在纳米颗粒的表面形成多层膜，其中最大初始浓度为0.5wt%的SDS可以用于均匀地包覆磁铁矿纳米颗粒。在较高浓度下，SDS从纳米颗粒表面分离。
Mesoporous magnetite nanoparticles are commonly used for biomedical and environmental applications. This can be attributed to their known magnetic properties and high surface area, the latter being a virtue of their nanometer-scale size. Applying coatings with various chemical functionalities to these nanoparticles increases their scope of application. Different organic and inorganic coatings have been explored. Sodium dodecyl sulfate (SDS) is a well-known surfactant that improves the surface properties of nanoparticles. This paper explores the in situ formation of SDS coatings on the surface of mesoporous magnetite nanoparticles prepared by means of a traditional co-precipitation method in air. Coatings made from solutions containing up to 2 wt% of SDS were investigated in respect of their composition, thermal characteristics, and magnetization by means of X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and magnetic susceptibility. Adsorption isotherms and detailed morphology of the coated nanoparticles were also evaluated. Results showed that SDS forms multilayers together with water on the surfaces of the nanoparticles, where a maximum initial concentration of 0.5 wt% of SDS could be used to homogeneously coat the magnetite nanoparticles. At higher concentrations, SDS detaches from the nanoparticles surfaces.