Oscillating droplet tribometer for sensitive and reliable wetting characterization of superhydrophobic surfaces
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Date
2022-07-27
Major/Subject
Mcode
Degree programme
Language
en
Pages
10
Series
Droplet, Volume 1, issue 1, pp. 38-47
Abstract
Accurate wetting characterization is crucial for the development of next-generation superhydrophobic surfaces. Traditionally, wetting properties are measured with a contact angle goniometer (CAG) suitable for a broad range of surfaces. However, due to optical errors and challenges in baseline positioning, the CAG method suffers from inaccuracies on superhydrophobic surfaces. Here we present an improved version of the oscillating droplet tribometer (ODT), which can reliably assess wetting properties on superhydrophobic surfaces by measuring the frictional forces of a water-based ferrofluid droplet oscillating in a magnetic field. We demonstrate that ODT has superior accuracy compared to CAG by measuring the wetting properties of four different superhydrophobic surfaces (commercial Glaco and Hydrobead coatings, black silicon coated with fluoropolymer, and nanostructured copper modified with lauric acid). We show that ODT can detect the small but significant changes in wetting properties caused by the thermal restructuring of surfaces that are undetectable by CAG. Even more, unlike any other wetting characterization technique, ODT features an inverse sensitivity: the more repellent the surface, the lower the error of measurement, which was demonstrated by experiments and simulations.Description
| openaire: EC/H2020/725513/EU//SuperRepel
Keywords
Other note
Citation
Junaid, M, Nurmi, H, Latikka, M, Vuckovac, M & Ras, R 2022, ' Oscillating droplet tribometer for sensitive and reliable wetting characterization of superhydrophobic surfaces ', Droplet, vol. 1, no. 1, pp. 38-47 . https://doi.org/10.1002/dro2.9