Applications of hydrogel microparticles in vivo
and an actuation of a soft robot. (a) Schematic illustration of the gastric-retentive hydrogel pill, which swells in the stomach. Reproduced with permission from ref. [103
], Springer 2019. (b) Schematic device illustration and optical microscopy image of the hydrogel electronic fish with an integrated power system on-the-board. Reproduced with permission from ref. [104
], AAAS 2017.