Journal
LANGMUIR
Volume 33, Issue 3, Pages 685-695Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.6b03899
Keywords
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Funding
- Natural Science Foundation of China [21427805, 21574047]
- Fundamental Research Funds for the Central Universities [2015ZP005]
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The motions of the particles on the substrate of a drying sessile colloidal droplet of water were measured using multipartide tracking. Droplets with different concentrations (0-250 mM) of sodium chloride (NaCl) were compared. Several statistical quantities were proposed to characterize the heterogeneous behaviors of the particles and distinguish the effects of the flow field and the substrate interaction. For the salt-free droplet, most of the particles were nonadsorbed: and mobile without friction. With the presence of salt, the fraction of the adsorbed particles increases with increasing evaporation time and the initial salt concentration, which was explained by Derjaguni tandau Verwey-Overbeek interaction. The fraction of mobile particles is mostly frictionless for all samples. At low salt concentrations, the velocity of mobile particles increases:with the evaporation time to a peak and then decreases. The velocity is lower for higher salt concentrations. The effect of salt on the nonadsorbed particles was attributed to the electrokinetic effect.
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