Figure 2: Steps in producing electric field-sensitive MTX-PVA hydrogel strips: (a) Cross-linked solution after addition of GA, (b) solution poured into petri dish, (c) hydrogel after drying at 50°C, (d) hydrogel thin film kept in deionized water, (e) hydrogel thin film after drying at 40°C, (f) hydrogel strips baked at 80°C, (g) strips kept in deionized water, and (h) final strips dried at 40°C.