Next Article in Journal
Effect of Ageing on the Tracking Characteristics of High-Temperature Vulcanized Silicone Rubber Hybrid Composites for High Voltage Insulation
Previous Article in Journal
The Influence of Severe Plastic Deformation and Subsequent Annealing on the Microstructure and Hardness of a Cu–Cr–Zr Alloy
Article

Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

1
Institute of Fluid Mechanics (LSTM), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany
2
Erlangen Graduate School in Advanced Optical Technologies (SAOT), 91052 Erlangen, Germany
3
Institute for Surface Science and Corrosion (WW4), Friedrich-Alexander University (FAU), 91058 Erlangen, Germany
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(10), 2240; https://doi.org/10.3390/ma13102240
Received: 1 April 2020 / Revised: 24 April 2020 / Accepted: 7 May 2020 / Published: 13 May 2020
(This article belongs to the Special Issue Multiscale Interface Materials with Special Wettability)
Wettability, roughness and surface treatment methods are essential for the majority of practical applications, where liquid–solid surface interactions take place. The present study experimentally investigated the influence of different mechanical surface treatment methods on the static wettability of uncoated and amphiphobic-coated aluminium alloy (AlMg3) samples, specially focusing on the interaction between surface finishing and coating. Five different surfaces were prepared: as-received substrate, polished, sandpapered, fleece-abraded and sandblasted. After characterisation, the samples were spray-coated using an amphiphobic coating. The characterisation of the uncoated and coated samples involved measurements of the roughness parameters and the apparent contact angles of demineralized water and rapeseed oil. The coating was initially characterised regarding its adhesion to the sample and elevated temperature stability. The applied surface treatments resulted in the scattered sample roughness in the range of Sa = 0.3–15.8 µm, water contact angles of θ a p , w = 78°–106° and extremely low oil contact angles. Coating the samples more than doubled the surface roughness to Sa = 13.3–29 µm, whereas the initial surface treatment properties (structure, anisotropy, etc.) were entirely repressed by the coating properties. Coating led the water contact angles to increase to θ a p , w _ c o a t e d = 162°–173° and even more pronounced oil contact angles to increase to θ a p , o _ c o a t e d = 139°–150°, classifying the surfaces as superhydrophobic and oleophobic. View Full-Text
Keywords: wettability; amphiphobic; superhydrophobic; surface treatment; roughness; contact angle wettability; amphiphobic; superhydrophobic; surface treatment; roughness; contact angle
Show Figures

Graphical abstract

MDPI and ACS Style

Fedorova, N.; Ottinger, B.; Jovicic, V.; Zbogar-Rasic, A.; Delgado, A.; Virtanen, S. Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces. Materials 2020, 13, 2240. https://doi.org/10.3390/ma13102240

AMA Style

Fedorova N, Ottinger B, Jovicic V, Zbogar-Rasic A, Delgado A, Virtanen S. Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces. Materials. 2020; 13(10):2240. https://doi.org/10.3390/ma13102240

Chicago/Turabian Style

Fedorova, Nataliia, Bettina Ottinger, Vojislav Jovicic, Ana Zbogar-Rasic, Antonio Delgado, and Sannakaisa Virtanen. 2020. "Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces" Materials 13, no. 10: 2240. https://doi.org/10.3390/ma13102240

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop