使用细乳液法制备各向异性亚微米磁性 Janus 粒子的简便方法。

Facile method for preparation of anisotropic submicron magnetic Janus particles using miniemulsion.

机构信息

University of Lyon, University Lyon-1, CNRS, UMR 5007, LAGEP-CPE, 43 Bd. 11 Novembre 1918, F-69622 Villeurbanne, France; Department of Chemistry, Faculty of Science, Mahidol University, Phyathai, Bangkok 10400, Thailand.

出版信息

J Colloid Interface Sci. 2013 Nov 1;409:66-71. doi: 10.1016/j.jcis.2013.07.067. Epub 2013 Aug 13.

DOI:10.1016/j.jcis.2013.07.067

PMID:23993786

Abstract

Submicron hybrid magnetic, polystyrene (PS) based Janus particles containing magnetic nanoparticles (MNPs) on one side were successfully assembled using the miniemulsion/solvent evaporation method. Nanodroplets of styrene (St) monomer in the presence of PS and MNPs were generated in an aqueous continuous phase. The subsequent evaporation of St monomers resulted the precipitation of PS and MNPs into spherical nanoparticles. The effect of PS content, oil:water phase ratio, MNPs:PS ratio, and type and concentration of stabilizers on Janus morphology was investigated. A MNPs:PS weight ratio of 1:1 promoted the formation of Janus-like particles with MNPs located on one side due to the increased PS concentration during evaporation of the monomer solvent. Of the stabilizing agents tested (sodium dodecylsulfate (SDS), Triton X-405, polyvinyl alcohol, and Pluronic F-68), the presence of 1.0 g L(-1) SDS and 20.0 g L(-1) Pluronic F-68 was found to effectively stabilize hybrid particles with Janus morphology.

摘要

使用微乳液/溶剂蒸发法成功组装了一侧含有磁性纳米粒子 (MNP) 的亚微米混合磁性聚苯乙烯 (PS) 各向异性粒子。苯乙烯 (St) 单体纳米液滴在 PS 和 MNP 的存在下在水连续相中生成。随后 St 单体的蒸发导致 PS 和 MNP 沉淀为球形纳米粒子。研究了 PS 含量、油/水相比例、MNP:PS 比以及稳定剂的类型和浓度对各向异性形态的影响。由于单体溶剂蒸发过程中 PS 浓度增加，MNP:PS 重量比为 1:1 促进了具有 MNP 位于一侧的类各向异性粒子的形成。在所测试的稳定剂（十二烷基硫酸钠 (SDS)、Triton X-405、聚乙烯醇和 Pluronic F-68）中，发现 1.0 g L(-1) SDS 和 20.0 g L(-1) Pluronic F-68 的存在可有效稳定具有各向异性形态的混合粒子。