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Water-stable, magnetic silica-cobalt/cobalt oxide-silica multishell submicrometer spheres

机译:耐水的磁性二氧化硅-钴/氧化钴-二氧化硅多壳亚微米球

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摘要

A method to produce monodisperse magnetic composite spheres with diameters from less than 100 nm to more than 1 mu m in water solution is reported. The spheres consist of a dielectric silica core and a cobalt/cobalt oxide shell which can be protected from further oxidation with an outer shell of silica or, alternatively, they can be covered with the polymer polyvinylpyrrolidone as a stabilizer. The formation of a uniform magnetic shell proceeds wit the adsorption of metallic cobalt seeds, produced by the reduction of cobalt chloride with sodium borohydride, on a self-assembled layer of polyelectrolytes on the silica core. In the second step, and outer silica shell can be formed by the hydrolysis and condensation of (B-aminopropyl)trimethoxsilane and tetraethoxysilane. The double-shell composite spheres show excellent sphericity, monodispersity and a magnetic hysteresis loop at room temperature.
机译:报道了一种在水溶液中制备直径小于100nm至大于1μm的单分散磁性复合球的方法。这些球体由介电二氧化硅核和钴/钴氧化物壳组成,可以用二氧化硅的外壳保护它们免受进一步氧化,或者可以用聚合物聚乙烯吡咯烷酮作为稳定剂覆盖它们。均匀的磁性壳的形成是通过将金属钴种子吸附到二氧化硅核上的聚电解质自组装层上而完成的,该金属钴种子是通过用硼氢化钠还原氯化钴还原而产生的。在第二步骤中,可以通过(B-氨基丙基)三甲氧基硅烷和四乙氧基硅烷的水解和缩合形成二氧化硅外壳。双壳复合球在室温下显示出极好的球形度,单分散性和磁滞回线。

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