Journal Article10.1063/1.2731434
Dropwise condensation on superhydrophobic surfaces with two-tier roughness
TL;DR: In this paper, the authors reported continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves.
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Abstract: Dropwise condensation can enhance heat transfer by an order of magnitude compared to film condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid removal of condensate drops; however, such promotion has not been reported on engineered surfaces. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves. On such micro-/nanostructured surfaces, the condensate drops prefer the Cassie state which is thermodynamically more stable than the Wenzel state. With a hexadecanethiol coating, superhydrophobicity is retained during and after condensation and rapid drop removal is enabled.
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Citations
Wet‐Style Superhydrophobic Antifogging Coatings for Optical Sensors
TL;DR: It is demonstrated that a wet-style superhydrophobic coating, which simultaneously exhibits antifogging, antireflective, and self-cleaning properties, can be prepared by pattern transferring low-surface-energy microstructures onto a heterostructured nanoscale thin film comprising polymers and silica nanoparticles.
149
Fabrication and superhydrophobicity of fluorinated carbon fabrics with micro/nanoscaled two-tier roughness
TL;DR: In this paper, a superhydrophobic carbon fabric with micro/nanoscaled two-tier roughness was fabricated by decorating carbon nanotubes (CNTs) onto micro-sized carbon fibers, using a catalytic chemical vapor deposition and subsequent fluorination surface treatment.
149
Hierarchical Structures for Superhydrophobic and Superoleophobic Surfaces.
Hannu Teisala,Hans-Jürgen Butt +1 more
TL;DR: This feature article reviews both natural and artificial hierarchical surface structures and their function in repelling liquids and draws some general conclusions as a guideline for designing robust superhydrophobic and superoleophobic surfaces.
Energy-Effective Frost-Free Coatings Based on Superhydrophobic Aligned Nanocones
TL;DR: The feasibility of superhydrophobic aligned nanocones as energy-effective frost-free coatings as well as intermittent weak airflow heating are demonstrated to develop antifrosting nanotechnologies for energy- effective heat exchangers such as heat pumps and refrigerators.
137
Hotspot cooling with jumping-drop vapor chambers
Kris F. Wiedenheft,H. Alex Guo,Xiaopeng Qu,Jonathan B. Boreyko,Fangjie Liu,Kungang Zhang,Feras Eid,Arnab Choudhury,Zhihua Li,Chuan-Hua Chen +9 more
TL;DR: In this paper, a jumping-drop vapor chamber consisting of parallel plates of a superhydrophilic evaporator and a super-hydrophobic condenser is proposed to address mobile hotspots with a pathway toward effective thermal transport in the out-ofplane direction.
134
References
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Synthesis of Large Arrays of Well-Aligned Carbon Nanotubes on Glass
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Superhydrophobic Carbon Nanotube Forests
Kenneth K. S. Lau,José Bico,Kenneth B. K. Teo,Manish Chhowalla,Gehan A. J. Amaratunga,William I. Milne,Gareth H. McKinley,Karen K. Gleason +7 more
TL;DR: In this paper, the creation of a stable, superhydrophobic surface using the nanoscale roughness inherent in a vertically aligned carbon nanotube forest together with a thin conformal hydrophobic poly(tetrafluoroethylene) (PTFE) coating on the surface of the nanotubes was demonstrated.