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Electrical potential induced switchable wettability of super-aligned carbon nanotube films

机译:电位诱导的超取向碳纳米管薄膜的可切换润湿性

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摘要

Controlling of the wettability of micro-nano scale surfaces not only plays important roles in basic science but also presents some significant applications in interference shielding materials, microfluidics and phase-change heat transfer enhancement, etc. Here, the superhydrophobic super-aligned carbon nanotube (SACNT) films are firstly obtained by the chemical vapor deposition method and the annealing process. Then their wettabilities are in-situ switched by the electrowetting strategy. Specifically, the fascinating transformation of superhydrophobicity to the superhydrophilicity is achieved by exerting external DC voltages across the CNT-liquid interfaces, and the transitions of Cassie-to-Wenzel states are observed on the multilayer SACNT films. In addition, the electrowetting induced salt absorption of the porous SACNT is also reported here. Finally, the threshold voltages of the electrowetting behaviors for different liquids on the SACNT films and unit capacitances across the CNT-liquid interfaces are obtained, which reveal that the SACNT films have much more outstanding electrowetting properties than the previously reported works. Our approach reported here demonstrates that the wettability of SACNT films could be simply, effectively and in-situ controlled by the electrowetting method, which will have many profound implications in numerous applications such as phase-change heat transfer enhancement, optical lens with variable focal length and microfluidics, etc. (C) 2017 Elsevier B.V. All rights reserved.
机译:控制微纳米级表面的润湿性不仅在基础科学中起着重要作用,而且在干扰屏蔽材料,微流体和相变传热增强等方面也有一些重要应用。在这里,超疏水超取向碳纳米管(首先通过化学气相沉积法和退火工艺获得SACNT)膜。然后通过电润湿策略就地切换其润湿性。具体地,通过在CNT-液体界面上施加外部DC电压,实现了从超疏水性到超亲水性的迷人转变,并且在多层SACNT膜上观察到了Cassie-Wenzel态的转变。另外,这里也报道了电润湿引起的多孔SACNT的盐吸收。最后,获得了不同液体在SACNT膜上的电润湿行为的阈值电压和跨CNT-液体界面的单位电容,这表明SACNT膜比以前报道的工作具有更出色的电润湿性能。我们在这里报道的方法表明,通过电润湿方法可以简单,有效和就地控制SACNT膜的润湿性,这在相变传热增强,焦距可变的光学透镜等众多应用中将具有深远的意义。 (C)2017 Elsevier BV保留所有权利。

著录项

  • 来源
    《Applied Surface Science》 |2018年第ptaa期|628-635|共8页
  • 作者单位

    China Acad Space Technol, Energy Convers Res Ctr, Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China;

    Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Beijing 100084, Peoples R China|Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China;

    China Acad Space Technol, Energy Convers Res Ctr, Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China;

    China Acad Space Technol, Energy Convers Res Ctr, Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China;

    China Acad Space Technol, Energy Convers Res Ctr, Qian Xuesen Lab Space Technol, Beijing 100094, Peoples R China;

    Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Beijing 100084, Peoples R China|Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Carbon nanotube films; Superhydrophobicity; Superhydrophilicity; Electrowetting; Switchable wettability;

    机译:碳纳米管薄膜;超疏水性;超亲水性;电泳;可切换润湿性;
  • 入库时间 2022-08-18 03:04:38

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