Abstract
Dynamics of the evaporative drying of ultrapure water (UPW) droplets on a hydrophobic Si surface in a controlled ambient is studied. A quantitative study of the watermarks (WM) residue volume and mass is performed from low to high ambient humidity. The effects of oxygen in the gas phase and dissolved O2 concentration in UPW are investigated for different levels of ambient humidity. The shape of the drying residue on surface is studied to estimate the mechanism of residual colloids/particles deposition in presence of different ambient conditions. Our quantitative study on WM formation in different ambient humidity showed a linear increase in drying residue mass as a function of the initial UPW droplet volume.
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