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We report on novel ferrogels derived from polysaccharides (sodium alginateand chitosan) with embedded iron oxide nanoparticles synthesized in situ andtheir combination with thermally responsive poly (N-isopropylacrylamide) forexternally-driven drug release using AC magnetic fields. Samples werecharacterized by Raman spectroscopy, transmission electron microscopy (TEM) andmagnetic measurements. The obtained nanoparticles were found to be of ca. 10 nmaverage size, showing magnetic properties very close to those of the bulkmaterial. The thermal response was measured by power absorption experiments,finding specific power absorption (SPA) values between 100-300 W/g, which wasenough for attaining the lower critical solution temperature (LCST) of thepolymeric matrix within few minutes. This fast response makes these materialsgood candidates for externally controlled drug release.

Magnetic hydrogels derived from polysaccharides with improved specific power absorption: potential devices for remotely triggered drug delivery