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Proceedings Paper

Simple top down imaging measurement of contact angle for practical assessment of hydrophilic surfaces
Author(s): Guilherme Dutra; Cicero Martelli; John Canning
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Paper Abstract

Top down imaging is used to extract the contact angle, θ, of drops on surfaces greatly relaxing the requirements and limits demanded by side imaging. The method is compared between two standard lateral measurement techniques (the tangent method and the height/diameter method) for the hydrophilic contact angle of a droplet of water (20 drops of 2 μl each) on borosilicate slide: θ= (52 ± 7)° and (52 ± 6)°, respectively, and (53 ± 8)°, for the proposed method, agreeing within experimental error. This technique can be applied on multiple contact angle measurements, depression, between electronic components and on concave surfaces. The top down method has the potential to revolutionize diagnostics by making contact angle measurements ubiquitous and accessible to low cost imaging.

Paper Details

Date Published: 1 July 2015
PDF: 4 pages
Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96550S (1 July 2015); doi: 10.1117/12.2185249
Show Author Affiliations
Guilherme Dutra, Federal Univ. of Technology, Paraná (Brazil)
Cicero Martelli, Federal Univ. of Technology, Paraná (Brazil)
John Canning, Federal Univ. of Technology, Paraná (Brazil)
The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 9655:
Fifth Asia-Pacific Optical Sensors Conference
Byoungho Lee; Sang-Bae Lee; Yunjiang Rao, Editor(s)

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