Anisotropically structured magnetic aerogel monoliths

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 magnet...

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Bibliographic Details
Published in:Nanoscale 2014-11, Vol.6 (21), p.13213-13221
Main Authors: Heiligtag, Florian J, Airaghi Leccardi, Marta J I, Erdem, Derya, Süess, Martin J, Niederberger, Markus
Format: Article
Language:English
Subjects:
Aerogels
Anisotropy
Magnetic fields
Nanostructure
Porosity
Segmentation
Surface layer
Texture
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Summary: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.
ISSN:2040-3364
2040-3372
DOI:10.1039/c4nr04694c