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Figure 30. Hydrogel-based soft patch for TDD. (a) Schematic of the device structure. (b) Schematic of gelation and solution process of hydrogel. (c) Photographs of hydrogel loaded with different dyes. (d) Photographs of fabricated device with R6G as simulated drug under normal ambient light and UV light. Poloxamer 407-based hydrogel, which is thermosensitive and has been approved by the FDA, was used in this study. Because of hydrophobic interactions between the copolymer chains, poloxamer 407 aqueous solutions (20-30 wt%) exhibit reversible thermogelation property, which can be characterized by the concentration-dependent sol- gel transition temperature (Tsol-gel).153 The solutions switch between fluid and semi-solid states when the temperature changes near the Tsol-gel, as illustrated in Figure 30b. This reversible sol-gel property gives poloxamer 407 hydrogel many advantages in transdermal drug delivery applications, such as easy drug loading, good contact with skin, easy removal from the skin, and good electrical conductivity. Figure 30c presents the images of poloxamer 407 solutions loaded with R6G (60 μmol·L-1) and MB (60 μmol·L-1), which clearly show their transition between fluid and semi-solid states as the temperature changes. The dye-loading and plain poloxamer 407 solutions were dispensed into the two 84PDF Image | HIGH PERFORMANCE TRIBOELECTRIC NANOGENERATOR AND ITS APPLICATIONS
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