Figure 1. (A) Schematic description of a 4D mask pack integrated with multi-layered and compartmented hydrogel. (B) Preparation flow diagram of multi-layered and compartmented hydrogel by photolithography technique. (C) Self-folding assembly of a hydrogel depending on the temperature.
Figure 2. Effects of AAm and NIPAM concentration on the expansion ratio of the hydrogel.
Figure 3. Effects of AAm and MBA concentration on the expansion ratio of the hydrogel.
Figure 4. (A) Curvatures of the multi-layered hydrogels estimated by a mathematical model developed for the curvature of a heat-induced bimetallic strip. (B, C) a self-folded hydrogel with different curvatures depending on the temperature (B, C). (D) hysteresis curve of curvatures in each compartmented hydrogel (wing and base).
Figure 5. Enhancing the facial adhesion of the hydrogel mask introduced to the skin temperature by self-transformation.
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