Fig. 1: Light-deviated crack propagation in a drying droplet.
From: Programming crack patterns with light in colloidal plasmonic films
a Scheme of the formation of periodic cracks during drying of a colloidal droplet (b) Scheme of the experimental set-up, a drying colloidal droplet on a plasmonic substrate, illuminated by a condensed 532 nm laser and c top-view of the drying colloidal droplet. d Optical microscopy image sequence of the crack propagation when a laser beam is applied: first and second lines with the laser’s power set at 0.19 and 0.67 W/cm2 respectively. e Relationship between plasmonic absorbance and laser wavelength to obtain high photothermal heating. f Qualitative evolution profiles of the light intensity, the temperature and the evaporation rate as function of the distance. Optical micrograph of the deformed meniscus (inset: zoom of the deviated part).
