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We report thermo- and photo-responsive hydrogel capsules, providing controlled encapsulation and triggered release of water-soluble encapsulants. Monodisperse O/W/O (oil-in-water-in-oil) double-emulsion drops are produced in a capillary microfluidic device as templates, which transform into hydrogel capsules upon polymerization of thermo-sensitive monomers in the water phase containing gold nanorods.
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Kim et al. (2013) studied this question.
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