Superhydrophobic surfaces exhibit large contact angle and small hysteresis which promote liquid transport and enhance heat transfer. Here, liquid-vapor phase change behavior is reported on superhydrophobic surfaces with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking the surface structure of lotus leaves. Compared to one-tier microtexture which energetically favors the Wenzel state, the two-tier texture with nanoscale roughness favors the Cassie state, the desired superhydrophobic state. During droplet evaporation, the two-tier texture delays the transition from Cassie to Wenzel state. Using two-tier texture with hexadeconethiol coating, continuous dropwise condensation was demonstrated for the first time on engineered superhydrophobic surfaces.
- Nanotechnology Institute
Evaporation and Condensation on Two-Tier Superhydrophobic Surfaces
Chen, C, Cai, Q, & Chen, C. "Evaporation and Condensation on Two-Tier Superhydrophobic Surfaces." Proceedings of the ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B. Tainan, Taiwan. June 6–9, 2008. pp. 1021-1022. ASME. https://doi.org/10.1115/MNHT2008-52355
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