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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >Synthesis and characterization of superparamagnetic core-shell micrometre-sized particles of narrow size distribution by a swelling process
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Synthesis and characterization of superparamagnetic core-shell micrometre-sized particles of narrow size distribution by a swelling process

机译：溶胀法合成窄尺寸分布的超顺磁性核-壳微米级颗粒

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In previous publications we described several methods to prepare iron oxide and Fe magnetic nanoparticles entrapped within poly(divinyl benzene) or carbon composite microspheres for various biomedical applications. However, these methods involved relatively complex synthetic processes, the size of the entrapped nanoparticles could hardly be manipulated and the obtained particles were mostly ferromagnetic. The present work describes a new simple approach to overcome these obstacles. For this purpose, core-shell polystyrene/(poly(divinyl benzene)/ferrocene) and polystyrene/(poly(divinyl benzene-styrene)/ferrocene) micrometre-sized particles of narrow size distribution were prepared by a room temperature swelling of uniform polystyrene template microspheres dispersed in an aqueous continuous phase with emulsion droplets of a swelling solvent, such as toluene containing the monomers styrene and/or divinyl benzene, and the initiators azoisobutyronitrile and ferrocene. The monomer(s) within the swollen uniform polystyrene template microspheres were then polymerized at elevated temperature. Superparamagnetic and ferromagnetic poly(divinyl benzene)-Fe3O4 and poly(styrene-divinyl benzene)-Fe3O4 composite microspheres of narrow size distribution were then formed by annealing the previous micrometre-sized composite particles containing ferrocene at 330 °C for 2 h under ambient atmosphere in a sealed cell, followed by the dissolution of the polystyrene template part. This study shows that the size of the Fe3O4 nanoparticles entrapped within the poly(divinyl benzene) and poly(divinyl benzene-styrene) matrices can be controlled by adjusting the [divinyl benzene]/[styrene] volume ratio. Superparamagnetic C-Fe micrometre-sized particles of narrow size distribution were formed by annealing the PDVB-Fe3O4 particles at 450 °C under hydrogen atmosphere for 2 h.
机译：在以前的出版物中，我们描述了几种方法，用于制备包裹在聚二乙烯基苯或碳复合微球中的氧化铁和Fe磁性纳米粒子，用于各种生物医学应用。然而，这些方法涉及相对复杂的合成过程，几乎不能控制被包裹的纳米颗粒的尺寸，并且所获得的颗粒大部分是铁磁性的。本工作描述了一种克服这些障碍的新的简单方法。为此，通过在室温下膨胀均匀的聚苯乙烯，制备了窄尺寸分布的核-壳型聚苯乙烯/（聚（二乙烯基苯）/二茂铁）和聚苯乙烯/（聚（二乙烯基苯-苯乙烯）/二茂铁）微米尺寸的颗粒。模板微球分散在水连续相中，并带有溶胀剂的乳液液滴，例如含有单体苯乙烯和/或二乙烯基苯的甲苯，以及引发剂偶氮异丁腈和二茂铁。然后在升高的温度下使溶胀的均匀聚苯乙烯模板微球内的单体聚合。然后，通过将先前的含二茂铁的微米级复合颗粒在环境温度下于330°C退火2 h，形成尺寸分布较窄的超顺磁性和铁磁性聚（二乙烯基苯）-Fe3O4和聚（苯乙烯-二乙烯基苯）-Fe3O4复合微球。在密封的小室中，然后溶解聚苯乙烯模板部分。这项研究表明，可以通过调节[二乙烯基苯] / [苯乙烯]的体积比来控制包裹在聚（二乙烯基苯）和聚（二乙烯基苯-苯乙烯）基质中的Fe3O4纳米粒子的尺寸。通过将PDVB-Fe3O4颗粒在氢气气氛下于450°C退火2 h形成尺寸分布较窄的超顺磁性C-Fe微米级颗粒。

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