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Anisotropically structured magnetic aerogel monoliths

2014; Royal Society of Chemistry; Volume: 6; Issue: 21 Linguagem: Inglês

10.1039/c4nr04694c

2040-3372

Florian J. Heiligtag, Marta Jole Ildelfonsa Airaghi Leccardi, Derya Erdem, Martin Süess, Markus Niederberger,

Advanced Photocatalysis Techniques

Texturing of magnetic ceramics and composites by aligning and fixing of colloidal particles in a magnetic field is a powerful strategy to induce anisotropic chemical, physical and especially mechanical properties into bulk materials. If porosity could be introduced, anisotropically structured magnetic materials would be the perfect supports for magnetic separations in biotechnology or for magnetic field-assisted chemical reactions. Aerogels, combining high porosity with nanoscale structural features, offer an exceptionally large surface area, but they are difficult to magnetically texture. Here we present the preparation of anatase–magnetite aerogel monoliths via the assembly of preformed nanocrystallites. Different approaches are proposed to produce macroscopic bodies with gradient-like magnetic segmentation or with strongly anisotropic magnetic texture.