Figure 2.

Printability and programmability of the KNF ink via the MSP strategy. (a) Digital photos of wavy (i), straight (ii), zigzag (iii), and triangular (iv) lines and complex geometries of four-leaf clover (v), Archimedean spiral (vi), and palindrome (vii) labeled with Rhodamine 6G. The scale bar is 1 mm. (b) Digital photos of shell structures of the upside-down conical flask (i), flexible tube (ii), trumpet shell (iii), and hollow sphere (iv) labeled with Rhodamine 6G. The scale bar is 1 cm. (c) Schematic illustration of the protonation and cross-linking process of two contiguous printed KNF ink in the microgel matrix. (d–f) Designed models (i), printed KNFs in microgel matrix (ii), printed KNF gels (iii), and printed KNF aerogels (iv) of the corresponding octopus, aircraft, and vessel architectures. The scale bar is 1 cm.