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Bio-inspired design of ice-retardant devices based on benthic marine invertebrates: the effect of surface texture

Homayun Mehrabani, Neil Ray, Kyle Tse, View ORCID ProfileDennis Evangelista
doi: https://doi.org/10.1101/005470
Homayun Mehrabani
1Department of Bioengineering, University of California, Berkeley, CA 94720-1762, USA
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Neil Ray
1Department of Bioengineering, University of California, Berkeley, CA 94720-1762, USA
4Current address: Duke University School of Medicine, Durham, NC 27710, USA
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Kyle Tse
2Department of Mechanical Engineering, University of California, Berkeley, CA 94720-1740, USA
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Dennis Evangelista
3Department of Integrative Biology, University of California, Berkeley, CA 94720-3140, USA
5Current address: Department of Biology, University of North Carolina at Chapel Hill, NC 27510-3280, USA
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ABSTRACT

Growth of ice on surfaces poses a challenge for both organisms and for devices that come into contact with liquids below the freezing point. Resistance of some organisms to ice formation and growth, either in subtidal environments (e.g. Antarctic anchor ice), or in environments with moisture and cold air (e.g. plants, intertidal) begs examination of how this is accomplished. Several factors may be important in promoting or mitigating ice formation. As a start, here we examine the effect of surface texture alone. We tested four candidate surfaces, inspired by hard-shelled marine invertebrates and constructed using a three-dimensional printing process. We screened biological and artifical samples for ice formation and accretion in submerged conditions using previous methods, and developed a new test to examine ice formation from surface droplets as might be encountered in environments with moist, cold air. It appears surface texture plays only a small role in delaying the onset of ice formation: a stripe feature (corresponding to patterning found on valves of blue mussels, Mytilus edulis, or on the spines of the Antarctic sea urchin Sterechinus neumayeri) slowed ice formation an average of 25% compared to a grid feature (corresponding to patterning found on sub-polar butterclams, Saxidomas nuttalli). The geometric dimensions of the features have only a small (∼6%) effect on ice formation. Surface texture affects ice formation, but does not explain by itself the large variation in ice formation and species-specific ice resistance observed in other work. This suggests future examination of other factors, such as material elastic properties and coatings, and their interaction with surface pattern.

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Posted June 26, 2014.
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Bio-inspired design of ice-retardant devices based on benthic marine invertebrates: the effect of surface texture
Homayun Mehrabani, Neil Ray, Kyle Tse, Dennis Evangelista
bioRxiv 005470; doi: https://doi.org/10.1101/005470
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Bio-inspired design of ice-retardant devices based on benthic marine invertebrates: the effect of surface texture
Homayun Mehrabani, Neil Ray, Kyle Tse, Dennis Evangelista
bioRxiv 005470; doi: https://doi.org/10.1101/005470

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