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Diffusion and wetting on contaminated solids
Author(s) -
Shanahan M. E. R.
Publication year - 2005
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200500920
Subject(s) - wetting , drop (telecommunication) , chemistry , capillary action , thermodynamics , materials science , physics , mechanical engineering , engineering
The wetting dynamics of a drop of liquid (1) deposited on a solid on which there is already a thin layer of liquid (2) (contaminant, or maybe a wetting agent) is considered. Diffusion of liquid 2 into liquid 1 by Fickian diffusion leads to evolving effective solid/drop interfacial free energy, occurring during spreading, and modifying wetting kinetics. Spreading rate is increased. Strange behaviour is predicted near equilibrium conditions. The wetting line may “overshoot”, before receding asymptotically. The motion of a two‐dimensional drop is modelled, assuming it is given a slight push to one side after deposition. We expect a regime of spontaneous translational drop motion due to asymmetry in capillary conditions at the two triple lines. Diffusional wetting is compared to reactive wetting.