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Hysteresis of the contact angle of a meniscus inside a capillary with smooth, homogeneous solid walls

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journal contribution
posted on 16.08.2016, 10:41 by I. Kuchin, Victor Starov
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 θr, advancing θa , and equilibrium θe 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 β-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.

Funding

This research was supported by the Engineering and Physical Sciences Research Council, U.K.; the CoWet Marie Curie ITN project, EU; the COST MP1106 project and MAP EVAPORATION project, European Space Agency; and COST MP 1106, EU.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Langmuir: the ACS journal of surfaces and colloids

Volume

32

Issue

21

Pages

5333 - 5340

Citation

KUCHIN, I. and STAROV, V., 2016. Hysteresis of the contact angle of a meniscus inside a capillary with smooth, homogeneous solid walls. Langmuir: the ACS journal of surfaces and colloids, 32(21), pp. 5333-5340.

Publisher

© American Chemical Society

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

18/04/2016

Publication date

2016-05-20

Copyright date

2016

Notes

This paper was accepted for publication in the journal Langmuir: the ACS journal of surfaces and colloids and the definitive published version is available at http://dx.doi.org/10.1021/acs.langmuir.6b00721.

ISSN

0743-7463

eISSN

1520-5827

Language

en