Fig. 2: Quantification of mechanical forces required for self-healing.
From: Autonomous self-healing organic crystals for nonlinear optics

a Schematic representation of mechanical loading performed on the crystals of 1 using a force sensor (arrows towards left and right indicate the translation direction of the stage; the green arrow represents a gentle force, which is within the limit for observing crystals’ self-healing). b Optical image of a crystal under gentle push (load 40 mN; upper panels) and large force (load 74 mN; lower panels). c Load vs crystal thickness plot from multiple crystals in loading cycles (green and red symbols correspond to healed and unhealed events under gentle and excessive force, respectively).