Abstract
Pentane drops on a water surface are predicted to have contact angles of the order of 1 degree or less in the phase of frustrated complete wetting. We have developed an optical method of measuring such small contact angles, applicable to cases where the refractive indices of the substrate and adsorbate are very similar and the fluid dynamics do not allow delay between image acquisitions, by using phase retrieval to map the surface profile of the drops. It is empirically shown that, with our method, a difference of nanometer order can be achieved for the phase-retrieved dimensions relative to their expected value. Results agree with numerical predictions by Weiss and Widom [Physica A 292, 137 (2001) [CrossRef] ].
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Thierry Corti and Ulrich K. Krieger
Appl. Opt. 46(23) 5835-5839 (2007)
Denis Fenistein, Gerard H. Wegdam, William V. Meyer, and J. Adin Mann
Appl. Opt. 40(24) 4134-4139 (2001)
G. Zaccanti and P. Bruscaglioni
Appl. Opt. 28(11) 2156-2164 (1989)