In a new study, researchers discovered that tweaking the texture of any surface and adding a thin layer of graphene oxide prevents 100% of frost from forming on surfaces for one week or potentially even longer. This is 1,000 times longer than current, state-of-the-art anti-frosting surfaces.
Someday, people might finally say goodbye to defrosting the freezer or scraping frost off slippery surfaces. Northwestern University engineers have developed a new strategy that prevents frost formation before it begins.
By incorporating the textured surface into infrastructure, the researchers imagine companies and government agencies could save billions of dollars per year in averted maintenance costs and energy inefficiencies."Unwanted frost accumulation is a major concern across industrial, residential and government sectors," said Northwestern's Kyoo-Chul Kenneth Park, who led the study.
Through experimental work and computation simulations, Park and his collaborators found that condensation is enhanced on the peaks and suppressed in the valleys of wavy surfaces. The small amount of condensed water in the valleys then evaporates, resulting in a frost-free area.In the previous study, Park's team developed a surface featuring millimeter-scale peaks and valleys with small angles in between.
"Most other anti-frosting surfaces are susceptible to damage from scratches or contamination, which degrades surface performance over time," Park said."But our anti-frosting mechanism demonstrates robustness to scratches, cracks and contaminants, extending the life of the surface."This hybrid macrotexture-graphene oxide surface offers a promising solution for preventing frost formation in various applications.
The study,"Robust hybrid diffusion control for long-term scalable frost prevention," was partially supported by the National Science Foundation and the Korea Institute for Science and Technology .
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