Simple top down imaging measurement of contact angle for practical assessment of hydrophilic surfaces

Guilherme Dutra; Cicero Martelli; John Canning

doi:10.1117/12.2185249

1 July 2015 Simple top down imaging measurement of contact angle for practical assessment of hydrophilic surfaces

Guilherme Dutra, Cicero Martelli, John Canning

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96550S (2015) https://doi.org/10.1117/12.2185249
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

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.

Citation Download Citation

Guilherme Dutra, Cicero Martelli, and John Canning "Simple top down imaging measurement of contact angle for practical assessment of hydrophilic surfaces", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96550S (1 July 2015); https://doi.org/10.1117/12.2185249

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