Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 6, Pages 7805-7814Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21704
Keywords
superhydrophobic; ultrafast laser processing; hierarchical structure; antifrosting; self-propelled droplet jumping
Funding
- National Key Research and Development Program of China [2018YFA0208502, 2017YFB1104900]
- National Natural Science Foundation of China [21733010, 51520105007, 51775299, 51473004]
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Preventing condensation frosting is crucial for air conditioning units, refrigeration systems, and other cryogenic equipment. Coalescence-induced self-propelled jumping of condensed microdroplets on superhydrophobic surfaces serves as a favorable strategy against condensation frosting. In previous reports, efforts were dedicated to enhance the efficiency of self-propelled jumping by constructing appropriate surface structures on superhydrophobic surfaces. However, the incorporation of surface structures results in larger area available for condensation to occur, leading to an increase in total amount of condensed water on the surface and partially counteracts the effect of promoted jumping on removing condensed water from the surface. In this paper, we focus on the competing effects between condensing and self-propelled jumping on promoting and preventing water accumulation, respectively. A series of micro- and nanostructured superhydrophobic surfaces are designed and prepared. The condensation process and self-propelled jumping behavior of microdroplets on the surfaces are investigated. Thousands of jumping events are statistically analyzed to acquire a comprehensive understanding of antifrosting potential of superhydrophobic surfaces with self-propelled jumping of condensed microdroplets. Further frosting experiments shows that the surface with the lowest amount of accumulated water exhibits the best antifrosting performance, which validates our design strategy. This work offers new insights into the rational design and fabrication of antifrosting materials.
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