465567 Designing Durable Icephobic Surfaces

Thursday, November 17, 2016: 5:00 PM
Continental 2 (Hilton San Francisco Union Square)
Kevin Golovin and Anish Tuteja, Materials Science and Engineering, University of Michigan, Ann Arbor, MI

Ice accretion has a negative impact on critical infrastructure, as well as a range of commercial and residential activities. Icephobic surfaces are defined by an ice adhesion strength τice < 100 kPa. However, the passive removal of ice requires much lower values of τice, such as on airplane wings or power lines (τice < 20 kPa). Such low τice values are scarcely reported, and robust coatings that maintain these low values have not been reported previously. Here we show that, irrespective of material chemistry, by tailoring the crosslink density of different elastomeric coatings, and by enabling interfacial slippage, it is possible to systematically design coatings with extremely low ice-adhesion (τice < 0.2 kPa). These newfound mechanisms allow for the rational design of icephobic coatings with virtually any desired ice adhesion strength. We also propose a new model for interfacial slippage, based on Flory-Huggins theory coupled with a Hemi-wicking analysis. Our model not only allows for icephobic elastomers, polymers and monolayers to be systematially designed, but also makes a connection to previous icephobic systems based on lubrication. Utilizing our newfound mechanisms and model, we fabricate extremely durable coatings that maintain τice< 10 kPa after severe mechanical abrasion, acid/base exposure, 100 icing/de-icing cycles, thermal cycling, accelerated corrosion, and exposure to Michigan wintery conditions over several months.

This work was published in Science Advances in March of 2016. DOI: 10.1126/sciadv.1501496.

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