Facile organic solvent-free synthesis of size-controlled hierarchically structured magnetic hollow spheres and potential application in adsorption for bovine serum album.
Facile organic solvent-free synthesis of size-controlled hierarchically structured magnetic hollow spheres and potential application in adsorption for bovine serum album.
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DOI：
10.1016/j.jcis.2011.10.056
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发表时间：
2012-02
影响因子：
9.9
通讯作者：
Cong Zhang;Hui Zhang;Bing Du;Rong Hou;Shaohua Guo
中科院分区：
文献类型：
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作者：
Cong Zhang;Hui Zhang;Bing Du;Rong Hou;Shaohua Guo
采用硬模板方法制备了一系列尺寸可控的分级纳米结构磁性空心球（MHS）（250-2330nm），该方法涉及在无有机溶剂条件下将铁氧体前体共沉淀在不同尺寸的预合成聚苯乙烯球上，然后进行煅烧。 SEM、TEM和HRTEM结果表明，随着模板尺寸的增加，构建分级纳米结构MHS的初级纳米颗粒清楚地显示出模板球尺寸依赖性的形态和堆积模式变化，从无序堆叠的球状和纳米棒状混合颗粒，到有序垂直取向的纳米棒状颗粒，再到致密的水平排列的纳米纺锤颗粒。 N2吸附-解吸数据表明，MHS球具有高BET表面积（48-83m2/g）和大孔体积（0.37-0.66cc/g）。振动样品磁化分析表明，MHS 球体具有 24-37emu/g 的中等磁化饱和度。吸附结果表明，BSA 的吸附量受构成 MHS 球的初级纳米粒子的不同形态和堆积模式的影响很大，最大吸附发生在主要由垂直取向的纳米棒状初级粒子组成的 MHS 球上。
A series of size-controllable hierarchically nanostructured magnetic hollow spheres (MHS) (250–2330nm) have been fabricated by using the hard-template method involving the coprecipitation of ferrite precursor over the pre-synthesized polystyrene spheres with varied sizes under organic solvent-free conditions followed calcinations. The SEM, TEM and HRTEM results indicate that the primary nanoparticles constructing hierarchically nanostructured MHS clearly show the template sphere size-dependent changes in morphologies and stacking modes from disorderly stacked globular and nanorodlike mixed particles, to orderly perpendicularly oriented nanorodlike particles, and to compact horizontally arranged nanospindle particles as the template size is increased. The N2adsorption–desorption data reveal that the MHS spheres have a high BET surface area (48–83m2/g) and large pore volumes (0.37–0.66cc/g). The vibration sample magnetization analysis shows that the MHS spheres have moderate magnetization saturation of 24–37emu/g. The adsorption results show that the BSA adsorbance is greatly affected by the varied morphologies and stacking modes of primary nanoparticles constructing the MHS spheres and the maximum adsorption occurs on the MHS spheres mainly comprised of perpendicularly oriented nanorodlike primary particles.