Fig. 3. (A–F) Bright field and fluorescence images of silica particles (20 μm) after printing with cast wrinkle stamps with wavelengths of 1.5 μm (A–C) and 3 μm (D–F). (G and H) SEM images of silica particles (20 μm) after printing with wrinkled stamps with wavelengths of 1.5 μm (G) and 3 μm (H). PEI concentration was set to 4 wt%, particles were removed by acetone, and patches were labeled with FITC.
