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Monostable superrepellent materials.

Yanshen Li1,2, David Quéré3, Cunjing Lv1,4

  • 1Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.

Proceedings of the National Academy of Sciences of the United States of America
|March 11, 2017
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Researchers discovered a "monostable" region where superrepellent surfaces spontaneously regain their liquid-repelling properties. This finding could lead to more robust superrepellent materials for various applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Physics of Soft Matter

Background:

  • Superrepellency, where liquids remain on rough surfaces in the Cassie state, offers reduced solid/liquid contact for applications like self-cleaning and droplet manipulation.
  • However, superrepellency is often lost due to impalement transitions, and recovery typically requires energy input.

Purpose of the Study:

  • To investigate the conditions under which superrepellent states can spontaneously transition back to their original state.
  • To identify a specific region in the phase space of surface chemistry and roughness that allows for reversible transitions.

Main Methods:

  • Controlled experimental investigations were conducted.
  • The phase space of surface chemistry and roughness was analyzed.
  • Transitions between Cassie and Wenzel states were monitored.

Main Results:

  • A
  • monostable
  • region was identified where transitions from the Cassie to the impaled Wenzel state are spontaneously reversible.
  • The specific conditions required for observing this monostability were established.

Conclusions:

  • The existence of a monostable region enables spontaneous recovery of superrepellency without external energy input.
  • Understanding these conditions can guide the design and engineering of robust superrepellent materials for advanced applications.