| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 72004 | Microporous and Mesoporous Materials | 2016 | 8 Pages |
•Composite silica-iron oxide hollow particles formed by a layering method.•Excellent heating properties under 400 kHz alternating magnetic field.•Adsorption equilibrium and release kinetics of vitamin B12 measured.•Radiofrequency heating found to be an effective release trigger.
Composite porous silica-iron oxide nanoparticles with the ability to store chemical payloads and release them upon triggering a radiofrequency field were prepared. The particle structure consisted of a hollow porous silica core, covered with a layer of iron oxide nanoparticles bound to the silica surface by electrostatic forces. The particle size distribution, morphology, porosity and stability was systematically studied together with their sorption capacity and heating properties under the effect of a radiofrequency magnetic field. It was observed that the particles are able to achieve a heat dissipation rate of nearly 200 W/g, which was high enough for using the radiofrequency field as a trigger mechanism for the remote release (desorption) of a chemical payload from the particles.
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