Deposition pattern of drying droplets

Xiuyuan Yang,Zechao Jiang,Peihan Lyu,Zhaoyu Ding,Xingkun Man

Figure 9. (a) shows the effect of a surfactant in the deposition patterns. When the initial surfactant concentration β is increased, the deposition pattern changes from mountain-like to volcano-like and then to coffee-ring pattern. All parameters are kcl = 0, kev = 0.002 and α = 1.0. (b) and (c) are the formation of the two-ring deposition pattern; (b) is the evolution of the profile of the surface and (c) is the evolution of the density distribution of solutes left on the substrate, μ(r, t)/(H0φ0). For (b) and (c), kev = 10−4, kcl = 0, α = 0.3 and β = 0.1. Reprinted with permission from [68]. Copyright (2020) the American Chemical Society.