From lotus effect to petal effect: Tuning the water adhesion of non-wetting rare earth oxide coatings. Issue 4 (April 2020)

• Record Type: Journal Article
• Authors: Xu, Pengyun; Coyle, Thomas W.; Pershin, Larry; Mostaghimi, Javad
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 4(2020)
• Page Start: 1692
• Page End: 1702
• Publication Date: 2020-04
• Subjects: Superhydrophobic -- Petal effect -- Solution precursor plasma spray -- Plasma treatment; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.12.003
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: A facile post-deposition plasma treatment was developed to tune the wetting behavior of Yb2 O3 coatings deposited via the solution precursor plasma spray process. The as-deposited coatings exhibited the lotus effect after vacuum treatment, with a water contact angle of ∼162° and a roll-off angle of ∼5°, due to the hierarchical columnar microstructure. When the plasma torch was scanned over the coatings as a post-deposition treatment, the rough top surfaces of the columns present in the as-deposited coatings became smooth, and the coatings then exhibited the petal effect, with a water contact angle of ∼150° to ∼130° and high, tunable adhesion to water. Analysis of the surface compositions showed that after vacuum treatment hydrocarbon adsorption on the as-deposited coatings and plasma-treated coatings was very similar. A mathematical model correlating surface structures with wetting behaviors was developed to elucidate the transition from the lotus effect to the petal effect .