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
Fabrication of flexible superhydrophobic biomimic surfaces
Miaojun Xu,Miaojun Xu,Nan Lu,Hongbo Xu,Dianpeng Qi,Yandong Wang,Shoulei Shi,Lifeng Chi,Lifeng Chi +8 more
TL;DR: In this article, a flexible superhydrophobic film is fabricated by thermally evaporating silver nanoparticles (Ag NPs) on the created flexible hemispheres arrays and modifying the Ag NPs surface with 1-dodecanethiol.
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Roughness controlled superhydrophobicity on single nanometer length scale with metal nanoparticles
TL;DR: In this paper, high water pinning nanostructures and trapping of water droplets onto surfaces via control of roughness on a single nanometer length-scale generated by deposition of preformed gas phase distinct copper nanoparticles on hydrophilic and hydrophobic surfaces.
Polydimethylsiloxane‐Silane Synergy enables Dropwise Condensation of Low Surface Tension Liquids
Kazi Fazle Rabbi,Jin Yao Ho,Xiao Yan,Jingcheng Ma,Muhammad Jahidul Hoque,Soumyadip Sett,Nenad Miljkovic +6 more
TL;DR: In this article , a low contact angle hysteresis polydimethylsiloxane with a low surface energy silane using atmospheric vapor phase deposition is proposed to promote dropwise condensation of low surface tension liquids.
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Elucidating the Mechanism of Condensation-Mediated Degradation of Organofunctional Silane Self-Assembled Monolayer Coatings.
TL;DR: In this paper, the authors developed a mechanistic understanding of water vapor condensation-mediated organofunctional silane self-assembled monolayer (SAM) coating degradation and validated their hypothesis through controlled coating synthesis procedures on silicon/silicon dioxide substrates.
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Self-Recovery Superhydrophobic Surfaces: Modular Design
TL;DR: A modular design strategy is proposed which combines self-recovery and good functional properties: Square pores surmounted by ridges achieve self- recovery even at 2 MPa and have a very small liquid/solid contact area.
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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.