Preparation of ultra-light magnetic nanocomposites using highly concentrated emulsions

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• 作者：Goutam Ghosh^a ;   ; ¹ ; Alejandro Vilchez^a ; Jordi Esquena^a ; Conxita Solans^a ; Carlos Rodrí ; guez-Abreu^a ;   ; ^b ;   ; ^{carlos.rodriguez@inl.int}
• 关键词：Composite materials ; Magnetic materials ; Nanostructures ; Polymers
• 刊名：Materials Chemistry and Physics
• 出版年：2011
• 出版时间：17 October 2011
• 年：2011
• 卷：130
• 期：1-2
• 页码：786-793
• 全文大小：2182 K

文摘

Hybrid inorganic¨Corganic ultra-light magnetic solid foams with iron oxide nanoparticles embedded in a divinylbenzene¨Cpolystyrene matrix were prepared using a highly concentrated emulsion polymerization method. Iron oxide nanoparticles with diameters of 3 and 10 nm were synthesized using two different methods. For comparison purposes, nanocomposites with magnetite nanoparticles dispersed in a non-porous polymeric matrix obtained by bulk polymerization were also investigated. Materials were characterized using several techniques such as dynamic light scattering (DLS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), small angle X-ray scattering (SAXS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and magnetization measurements. SEM and TEM images showed that solid foams are made of well-defined macro pores with nanoparticles embedded in the walls. The density of the solid foams was ca. 50?0 kg m^?, which is about 20 times lighter than the non-porous monoliths. The magnetic measurements show that both nanocomposites are superparamagnetic, and that there are differences regarding the interparticle interactions depending on matrix porosity. The synthesized materials may find applications in adsorbents, tissue reparation, enzyme supports, microreactors, or in water decontamination.