Fig. 1: Design principle of controllable dopamine polymerization for high-performance instant and adaptive hydrogel adhesives.
From: Rapid photocontrollable dopamine polymerization for instant adaptive wet adhesion
a Schematic illustration of blue-light-triggered deprotection of EDA and in situ polymer network formation within PDCHAs. The inset digital image shows the scale-up preparation of EDA, with the cost estimated based on the commercial prices of dopamine and ethylenediaminetetraacetic dianhydride, taking synthesis efficiency into account. b Adhesion strength comparison of PDCHAs prepared via the RPDP strategy and the conventional coating method. Inset: photographs of the respective adhesives applied to bent fingers. (n = 3 independent samples, and data are presented as mean ± SD). c Digital images of PDCHAs applied for wound closure. d Demonstration of strong wet adhesion of PDCHAs on both tissue and hydrophobic surfaces. e Digital images of complex PDCHA structures fabricated via extrusion-based 3D printing. f Comparison of DA polymerization mechanisms between the RPDP strategy and conventional oxidant-mediated approaches.
