TUTCRIS Research Portal

TY - JOUR

T1 - Superamphiphobic overhang structured coating on a biobased material

AU - Tuominen, Mikko

AU - Teisala, Hannu

AU - Haapanen, Janne

AU - Mäkelä, Jyrki M.

AU - Honkanen, Mari

AU - Vippola, Minnamari

AU - Bardage, Stig

AU - Wålinder, Magnus E P

AU - Swerin, Agne

PY - 2016/12/15

Y1 - 2016/12/15

N2 - 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.

AB - 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.

KW - Biobased material

KW - Coating

KW - Deposition

KW - Nanoparticle

KW - Oil repellency

KW - Perfluorohexane

KW - Plasma

KW - Self-cleaning

KW - Superamphiphobic

KW - Superhydrophobic

KW - Superoleophobic

KW - Titania

KW - Water repellency

KW - Wetting

KW - Wood

U2 - 10.1016/j.apsusc.2016.05.095

DO - 10.1016/j.apsusc.2016.05.095

M3 - Article

VL - 389

SP - 135

EP - 143

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

ER -