One-pot synthesis of well ordered mesoporous magnetic carriers

Abstract

The facile preparation of a mesoporous magnetic carrier technology is demonstrated. The micronsized spherical mesostructured particles are prepared using a newly-developed, one-step, combined emulsion and solvent evaporation (ESE) method. The surfactant-templated silica matrix display a well-ordered internal pore architecture. Very limited pore blocking, and only to a limited degree disordered-or worm-like structures are observed, induced by the iron oxide nanoparticles added to provide the superparamagnetic properties.The iron oxide content was precisely controlled, and the magnetic properties were well preserved during the process. Finally we demonstrate the applicability of the magnetically separable mesoporous material as an adsorbent for specific dissolved materials from dilute aqueous solutions.

Fabrication of mesoporous SiO2–C–Fe3O4/γ–Fe2O3 and SiO2–C–Fe magnetic composites

“…Most mesoporous silica magnetic composites are formed by inserting magnetic nanoparticles previously synthesised by refined procedures into the pores of the silica matrix [6,[12][13][14][15]. This synthetic methodology is costly and complex in terms of scalability.…”

Role of polymeric surfactants on the growth of manganese ferrite nanoparticles

“…It has been widely used in electronic [9,10], contrast-enhancement agents in MRI technology [11][12][13] and recording media [14]. However, magnetic properties of the nanoparticles and its application are strongly dependent on the size, shape, morphology and crystallinity of the nanoparticles [15][16][17][18][19]. Manganese ferrite nanoparticles with different sizes and morphologies have been synthesized by different methods.…”

Preparation of Highly Anisotropic Cobalt Ferrite/Silica Microellipsoids Using an External Magnetic Field

“…While the conventional ESE method usually leads to magnetic silica microspheres with an isotropic distribution of the magnetic nanoparticles, 43,44 we have obtained here magnetic silica microellipsoids containing magnetic nanoparticles aggregated in large chains. At larger scale, these particles exhibit in consequence some strong permanent magnetic moments that are responsible for the existence of magnetic dipolar interactions.…”