Magnetic Nanoparticles Entrapped in Siliceous Mesocellular Foam: A New Catalyst Support

Abstract

γ-Fe(2)O(3) nanoparticles were formed inside the cage-like pores of mesocellular foam (MCF). These magnetic nanoparticles showed a uniform size distribution that could be easily controlled by the MCF pore size, as well as by the hydrocarbon chain length used for MCF surface modification. Throughout the entrapment process, the pore structure and surface area of the MCF remained intact. The resulting magnetic MCF facilitated the immobilization of biocatalysts, homogeneous catalysts, and nanoclusters. Moreover, the MCF allowed for facile catalyst recovery by using a simple magnet. The supported catalysts exhibited excellent catalytic efficiencies that were comparable to their homogeneous counterparts.

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“…This confinement avoided the aggregation of SPIO even without surface modification of SPIO with organic molecules such as dextran, which is otherwise inevitable to prevent aggregation of the SPIO. 23 Next, we optimized the conditions for in situ growth of SPIO. The SPIO growth needs alkali as a catalyst, but the silica can be dissolved by the alkali.…”

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“…As is shown in Figure 1, the XRD spectrum of the MMCF exhibited a broad reflection (2θ = 11‐29 o ), approving the presence of amorphous silica. [ 23 ] This spectrum also indicated multiple peaks in the 2θ range 30 o ‐70 o , which revealed the presence of γ‐Fe 2 O 3 nanoparticles inside foam spheres. [ 22 ]…”

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“…55 Moreover, among silica-based coupling layers, porous silica can not only be easily prepared but can provide large surface areas for loading a great number of nanocatalysts and/or act as a protective shell to prevent catalysts from leaching. [56][57][58][59][60] As such, it is frequently used in assisting in the fabrication of various MRNCs.…”