Figure 10From: Drying nano particles solution on an oscillating tip at an air liquid interface: what we can learn, what we can doA ring stain and a demonstration of the physical processes involved in production of such a stain. production of such a stain. The ring stain is obtained from a 2-cm-diameter drop of coffee containing 1wt% solids. Multi exposures of spheres are superimposed to indicate the motion of the microspheres. (figure extracted from reference [1])Back to article page