Fig. 1: Continuous DLP 3D printing volumetric structural color with hydrogen bonds assisted colloidal inks.
From: Continuous resin refilling and hydrogen bond synergistically assisted 3D structural color printing
a Schematic of the continuous DLP 3D printing apparatus for fabricating 3D Lego brick structure with volumetric color property. b UV-curable structural color ink formation, UV-curable AM-based system mixed with aqueous dispersion solution of poly(styrene-methyl methacrylate-acrylic acid) latex particles (PS latex particles) and carbon black (CB), for 3D structuring. c pH characterization of pure aqueous dispersion solution of PS latex particles, pure monomer acrylamide (AM) aqueous solution, and aqueous mixture of PS latex particles with AM. Inset is the schematic diagram of hydrogen bonds formed between the -CONH2 in monomer AM and the -COOH on the surface of PS latex particles. The introduction of AM does not lead to an obvious change in the pH value of the aqueous dispersion solution of PS latex particles, which can ensure the stable dispersion of PS latex particles without aggregation. d Optical image of the just printed 3D Lego brick structure after post-washing. e–i Optical images of 3D Lego brick structures with different structural colors printed from PS particle diameters of 192 nm (e), 214 nm (f), 230 nm (g), 245 nm (h), and 265 nm (i), respectively. j–n Optical images of the cross-section of 3D Lego brick structures with different structural colors printed from PS particle diameters of 192 nm (j), 214 nm (k), 230 nm (l), 245 nm (m), and 265 nm (n), respectively.
