Aerial wetting contact angle measurement using confocal microscopy

Chesna, Jacob W. and Wiedmaier, Bob F. and Wang, Jinlin and Samara, Ayman and Leach, Richard K. and Her, Tsing-Hua and Smith, Stuart T. (2016) Aerial wetting contact angle measurement using confocal microscopy. Measurement Science and Technology, 27 (12). ISSN 1361-6501

[img] PDF - Repository staff only until 27 October 2017. - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (1MB)

Abstract

A method is presented in which the wetting contact angle of a sessile drop is acquired aerially using confocal techniques to measure the radius and the height of a droplet deposited on a planar surface. The repeatability of this method is typically less than 0.25°, and often less than 0.1°, for droplet diameters less than 1 mm. To evaluate accuracy of this method, an instrument uncertainty budget is developed, which predicts a combined uncertainty of 0.91° for a 1 mm diameter water droplet with a contact angle of 110°. For droplets having diameters less than 1 mm and contact angles between 15° and 160°, these droplets approach spherical shape and their contact angles can be computed analytically with less than 1% error. For larger droplets, gravitational deformation needs to be considered.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: https://doi.org/10.1088/0957-0233/27/12/125202
Depositing User: Eprints, Support
Date Deposited: 28 Oct 2016 11:05
Last Modified: 30 Oct 2016 04:19
URI: http://eprints.nottingham.ac.uk/id/eprint/38027

Actions (Archive Staff Only)

Edit View Edit View