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High-speed directional transport of condensate droplets on superhydrophobic saw-tooth surfaces.
Hou, Huimin; Wu, Xiaomin; Hu, Zhifeng; Gao, Sihang; Wu, Yuxi; Lin, Yukai; Dai, Liyu; Zou, Guisheng; Liu, Lei; Yuan, Zhiping.
Afiliação
  • Hou H; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
  • Wu X; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China. Electronic address: wuxiaomin@mail.tsinghua.edu.cn.
  • Hu Z; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
  • Gao S; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
  • Wu Y; Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
  • Lin Y; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
  • Dai L; Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.
  • Zou G; Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
  • Liu L; Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
  • Yuan Z; Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China. Electronic address: nikolatesal@bit.edu.cn.
J Colloid Interface Sci ; 649: 290-301, 2023 Nov.
Article em En | MEDLINE | ID: mdl-37352560
HYPOTHESIS: Most droplets on high-efficiency condensing surfaces have radii of less than 100 µm, but conventional droplet transport methods (such as wettability-gradient surfaces and structural-curvature-gradient surfaces) that rely on the unbalanced force of three-phase lines can only transport millimeter-sized droplets efficiently. Regulating high-speed directional transport of condensate droplets is still challenging. Therefore, we present a method for condensate droplet transportation, based on the reaction force of the superhydrophobic saw-tooth surfaces to the liquid bridge, the condensate droplets could be transported at high speed and over long distances. EXPERIMENTS: The superhydrophobic saw-tooth surfaces are fabricated by femtosecond laser ablation and chemical etching. Condensation experiments and luminescent particle characterization experiments on different surfaces are conducted. Aided by the theoretical analysis, we illustrate the remarkable performance of condensate droplet transportation on saw-tooth surfaces. FINDINGS: Compared with conventional methods, our method improves the transport velocity and relative transport distance by 1-2 orders of magnitude and achieves directional transport of the smallest condensate droplet of about 2 µm. Furthermore, the superhydrophobic saw-tooth surfaces enable multi-hop directional jumping of condensate droplets, leading to cross-scale increases in transport distances from microns to decimeters.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Colloid Interface Sci Ano de publicação: 2023 Tipo de documento: Article País de afiliação: China

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Colloid Interface Sci Ano de publicação: 2023 Tipo de documento: Article País de afiliação: China