A novel semi-interpenetrating polymer network based on alginate and poly(N-isopropylacrylamide) (PNiPAAm) has been synthesized that shows response to temperature and magnetic fields. Highly homogeneous porous hydrogels are obtained by copolymerizing N-isopropylacrylamide and bis-acrylamide in the presence of an aqueous alginate solution. The synthesis of magnetic iron oxides by in-situ oxidation of iron cations coordinated to the alginate network results in a hydrogel with an enhanced deswelling rate with respect to pure PNiPAAm.
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Hernández et al. (2008) studied this question.
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