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Superamphiphobic overhang structured coating on a biobased material

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Details

Original languageEnglish
Pages (from-to)135-143
Number of pages9
JournalApplied Surface Science
Volume389
DOIs
Publication statusPublished - 15 Dec 2016
Publication typeA1 Journal article-refereed

Abstract

A superamphiphobic coating on a biobased material shows extreme liquid repellency with static contact angles (CA) greater than 150° and roll-off angles less than 10° against water, ethylene glycol, diiodomethane and olive oil, and a CA for hexadecane greater than 130°. The coating consisting of titania nanoparticles deposited by liquid flame spray (LFS) and hydrophobized using plasma-polymerized perfluorohexane was applied to a birch hardwood. Scanning electron microscopy (SEM) imaging after sample preparation by UV laser ablation of coated areas revealed that capped structures were formed and this, together with the geometrically homogeneous wood structure, fulfilled the criteria for overhang structures to occur. The coating showed high hydrophobic durability by still being non-wetted after 500 000 water drop impacts, and this is discussed in relation to geometrical factors and wetting forces. The coating was semi-transparent with no significant coloration. A self-cleaning effect was demonstrated with both water and oil droplets. A self-cleanable, durable and highly transparent superamphiphobic coating based on a capped overhang structure has a great potential for commercial feasibility in a variety of applications, here exemplified for a biobased material.

ASJC Scopus subject areas

Keywords

  • Biobased material, Coating, Deposition, Nanoparticle, Oil repellency, Perfluorohexane, Plasma, Self-cleaning, Superamphiphobic, Superhydrophobic, Superoleophobic, Titania, Water repellency, Wetting, Wood

Publication forum classification

Field of science, Statistics Finland