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Contact angle hysteresis

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ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.cocis.2022.101574

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资金

  1. European Research Council under the European Union's Horizon 2020 Research and Innovation Programme (Advanced grant DynaMo) [883631]
  2. German Research Foundation (DFG)
  3. European Union [722497]
  4. Collaborative Research Center 1194
  5. European Research Council (ERC) [883631] Funding Source: European Research Council (ERC)

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Contact angle hysteresis is essential for providing friction to drops and is caused by the nanoscopic structure of surfaces. Understanding and measuring contact angle hysteresis and developing surfaces with low contact angle hysteresis are crucial for various applications.
In thermodynamic equilibrium, the contact angle is related by Young's equation to the interfacial energies. Unfortunately, it is practically impossible to measure the equilibrium contact angle. When for example placing a drop on a surface its contact angle can assume any value between the advancing theta(a)a and receding theta(r) contact angles, depending on how the drop is placed. theta(a) - theta(r )is called contact angle hysteresis. Contact angle hysteresis is essential for our daily life because it provides friction to drops. Many applications, such as coating, painting, flotation, would not be possible without contact angle hysteresis. Contact angle hysteresis is caused by the nanoscopic structure of the surfaces. Here, we review our current understanding of contact angle hysteresis with a focus on water as the liquid. We describe appropriate methods to measure it, discuss the causes of contact angle hysteresis, and describe the preparation of surfaces with low contact angle hysteresis.

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