Progress Toward Durable Icephobic Materials

Abstract

Ice accumulation is a major engineering challenge in many fields including aerospace, power generation, transportation, and infrastructure. A variety of solutions are being researched to address this challenge. Perhaps the most promising method of combating ice accumulation is by applying coatings with low values of interfacial ice adhesion strength, τice. Icephobic materials are those with ice adhesion below 100 kPa, and it has been shown that passive delamination can occur on surfaces with τice below 20 kPa. While various low adhesion surfaces have been prepared, durability concerns pervade applications where surfaces experience repeated icing or freeze-thaw cycles, mechanical abrasion, and particulate erosion. The present thesis explores methods of improving the durability of state-of-the-art icephobic materials in order to make them more suitable solutions to ‘the icing problem.’ Ice adhesion was measured using in-house load cell and centrifugation methods, allowing for the direct comparison of τice values between the materials developed. Various ways of improving the durability of icephobic surfaces were identified, including the stabilization of slippery lubricant-infused porous surfaces (SLIPS) via polymer cross-linking at the interface, copolymerization of commercial poly(dimethylsiloxane) resins with acrylate / styrene monomers yielding highly cross-linked network copolymer coatings, and lowering ice adhesion on commercially available adhesive films by introducing areas of substrate-film detachment. A collaborative study of femtosecond laser micromachining done with McGill University is also included which showed the cross-link density dependence of threshold fluence, and the varied surface morphologies that could be accessed by these means. These studies show effective methods of influencing icephobic material durability using straightforward methodologies and will inspire new investigations toward creating more durable icephobic materials that can alleviate concerns with ice accumulation for people that live in cold climates. Our investigations and proposed work show that cutting-edge research in this field can be done at Western, making Canada a viable leader of global anti-icing research

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