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The effect of different wear on superhydrophobic wax coatings
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
KTH Royal Institute of Technology, Sweden.
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2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 2, p. 195-203Article in journal (Refereed) Published
Abstract [en]

Wear resistance of superhydrophobic coatings made by spraying a crystallizing wax from supercritical carbon dioxide solutions was evaluated using several methods. Scratch tests were performed using a tip in contact with the surface using atomic force microscope (AFM). Compression tests were performed by applying different loads on a rubber stamp placed on the surface. Frictional wear was evaluated by stroking an index finger over the surfaces while measuring applied load and friction. The wetting properties of the coatings were subsequently evaluated as advancing and receding water contact angles, superhydrophobic sliding resistance according to a recently developed method and surface roughness, coating morphology was studied using scanning electron microscopy and optical profilometry. Scratching with tip of an AFM cantilever with a force of 12 nN removed major fraction of the wax coating from underlying silica substrate whereas subjecting the surfaces to a compressive load up to 59 kPa did not significantly influence the superhydrophobicity of the coatings. Frictional wear measurements indicate that superhydrophobic properties were immediately lost after pressing and moving a finger over the coating, as movement of the finger destroyed the fine surface structure. Nevertheless, the surfaces could withstand up to 200000 falling water drops without losing their superhydrophobicity. © 2017 De Gruyter Open Ltd. All rights reserved.

Place, publisher, year, edition, pages
De Gruyter Open Ltd , 2017. Vol. 32, no 2, p. 195-203
Keywords [en]
Compression test, Drop impact resistance, Friction test, Superhydrophobic coating, Superhydrophobicity, Wear resistance, Atomic force microscopy, Carbon dioxide, Coatings, Compression testing, Drops, Friction, Hydrophobicity, Scanning electron microscopy, Silica, Supercritical fluid extraction, Surface roughness, Surface testing, Wear of materials, Wetting, Coating morphology, Drop Impact, Optical profilometry, Supercritical carbon dioxides, Superhydrophobic coatings, Water contact angle, Water Repellence
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-38128DOI: 10.3183/NPPRJ-2017-32-02-p195-203Scopus ID: 2-s2.0-85052713603OAI: oai:DiVA.org:ri-38128DiVA, id: diva2:1294455
Available from: 2019-03-07 Created: 2019-03-07 Last updated: 2019-03-07Bibliographically approved

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