Figure 2.

a) Laser power in focal spot and slicing/hatching distance determine the material density of the structure of IP‐L 780. b,c) Phase contrast images of a stiffness‐gradient structure swelled in photoresist (10 µm × 30 µm × 5 µm) and in water, respectively. The structure was composed of the compartments prepared by different laser power from 15 to 40 mW. d) Swelling of a rectangular stripe (5 µm × 50 µm × 5 µm) in water in which the resin was inscribed with varied laser power (20 and 30 mW) and slicing/hatching distance (100 and 300 nm, phase contrast images). e) Temperature and solvent dependence of the degree of swelling in water for different curing of the resin. The linear strain is given relative to the dimensions of the resin swollen PNIPAM before extraction and swelling with water (ε (%) = −(h ₀ − h)/h ₀ × 100, where h ₀ is initial length). Each strain value denotes an average of three different sample. Scale bars: 20 µm for (b)–(d).