Indirect methods to measure wetting and contact angles on spherical convex and concave surfaces

Langmuir : the ACS Journal of Surfaces and Colloids
C W Extrand, Sung In Moon

Abstract

In this work, a method was developed for indirectly estimating contact angles of sessile liquid drops on convex and concave surfaces. Assuming that drops were sufficiently small that no gravitational distortion occurred, equations were derived to compute intrinsic contact angles from the radius of curvature of the solid surface, the volume of the liquid drop, and its contact diameter. These expressions were tested against experimental data for various liquids on polytetrafluoroethylene (PTFE) and polycarbonate (PC) in the form of flat surfaces, spheres, and concave cavities. Intrinsic contact angles estimated indirectly using dimensions and volumes generally agreed with the values measured directly from flat surfaces using the traditional tangent method.

References

Jun 1, 1997·Acta Psychiatrica Scandinavica·S J TaylorR Jenkins
Jul 23, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·C W Extrand, Sung In Moon
Jun 18, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·C W Extrand, Sung In Moon

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Citations

Feb 13, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Weiqin ZhuLei Jiang
Mar 17, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Masao Iwamatsu
Nov 15, 2016·The European Physical Journal. E, Soft Matter·Huanshu TanDetlef Lohse
Feb 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Zhanglei ZhuJaroslaw W Drelich

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