Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 37, Pages 20972-20978Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06754
Keywords
wetting hysteresis; contact time; bouncing droplet; hydrophobic surface; superhydrophobicity
Funding
- National Science Foundation of China [51475231, 51205196, 51202112]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Innovation Program for Graduate Education [KYLX_0261]
- Open Fund of Jiangsu Key Laboratory of Materials and Technology for Energy Conversion [MTEC-2015M04]
- Fundamental Research Funds for the Central Universities [NJ20150027]
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The contact time of impacting water droplets on superhydrophobic surfaces directly reflects the extent of thermal and energy conversions between the water droplet and the surface, which is also considered to be crucial to the practical applications. The purpose of this study was to reveal the relationship between the contact time and the wetting hysteresis. We designed and fabricated six classes of surfaces with different extent of hydrophobicity through modifying the microscale/nanoscale hierarchical textured titanium surfaces with 1H,1H,21-I,2H-perfluorodecyltrimethoxysilane, and we filmed the contact process of the water droplet impacting on these surfaces using a high-speed camera. It can be concluded that wetting hysteresis played a significant role in determining how long the impacting water droplet can bounce off the surface, based on the interfacial wetting mechanism and the work done against the resistance force generated by contact angle hysteresis during the dynamic process.
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