Journal
LANGMUIR
Volume 32, Issue 21, Pages 5333-5340Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.6b00721
Keywords
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Funding
- Engineering and Physical Sciences Research Council, U.K.
- CoWet Marie Curie ITN project, EU
- COST MP [1106]
- MAP EVAPORATION project
- European Space Agency
- COST MP, EU [1106]
- Engineering and Physical Sciences Research Council [EP/D077869/1, EP/C528557/1] Funding Source: researchfish
- EPSRC [EP/D077869/1, EP/J010596/1] Funding Source: UKRI
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A theory of contact angle hysteresis of a meniscus inside thin capillaries with smooth, homogeneous solid walls is developed in terms of surface forces (disjoining/conjoining pressure isotherm) using a quasi-equilibrium approach. The disjoining/conjoining pressure isotherm includes electrostatic, intermolecular, and structural components. The values of the static receding 0 advancing 0, and equilibrium Be contact angles in thin capillaries were calculated on the basis of the shape of the disjoining/conjoining pressure isotherm. It was shown that both advancing and receding contact angles depend on the capillary radius. The suggested mechanism of the contact angle hysteresis has a direct experimental confirmation: the process of receding is accompanied by the formation of thick beta-films on the capillary walls. The effect of the transition from partial to complete wetting in thin capillaries is predicted and analyzed. This effect takes place in very thin capillaries, when the receding contact angle decreases to zero.
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