Inkjet-printed line morphologies and temperature control of the coffee ring effect.
We have studied inkjet-printed drops of a conductive polymer. We show how varying drop spacing and temperature lead to several different printed line morphologies and offer a simple geometric explanation for these various forms. Also, by controlling the evaporation profile of drying drops and lines, we demonstrate control of the coffee ring effect by which solute is transferred to the rim. Under appropriate conditions, we are able to enhance or eliminate the coffee ring effect in our drying features.
Soltman
Dan
D
Department of Electrical Engineering and Computer Science, University of California, Berkeley, California 94720, USA. soltman@eecs.berkeley.edu
Subramanian
Vivek
V