Journal
RSC ADVANCES
Volume 5, Issue 3, Pages 1666-1672Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra12150c
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Funding
- National Science Foundation of China [51202112, 51475231]
- Jiangsu Innovation Program for Graduate Education [KYLX_ 0261]
- Fundamental Research Funds for the Central Universities [NZ2013307]
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The main purpose of this paper was to investigate the icephobic potential of hierarchical superhydrophobic surfaces, which were prepared by modifying micro-nanostructures (constructed by the combination of sand blasting and hydrothermal treatment) on the surfaces of Ti6Al4V alloy with fluoroalkylsilane (FAS-17). We previously reported that this hierarchical superhydrophobic surface displayed excellent nonwettability with apparent contact angle of 161 degrees and sliding angle of 3 degrees. Thus, the present study focused on the systematic characterizations and analyses of the icephobic potential of the superhydrophobic surfaces around three parameters, including icing-delay time, ice adhesion strength, and contact time of an impacting droplet on cold superhydrophobic surfaces. The results indicated that the icing-delay time of a droplet on the superhydrophobic surface was many times longer than that of a droplet on the smooth Ti6Al4V substrate, and the ice adhesion strength on superhydrophobic surface was greatly reduced, which was attributed to the Cassie wetting state of a droplet on the surface. Additionally, the dynamic droplet impact and rebound assay demonstrated that water droplets always bounced off of the superhydrophobic surfaces before freezing under subzero conditions.
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