Journal of Bionic Engineering ›› 2020, Vol. 17 ›› Issue (4): 633-643.doi: 10.1007/s42235-020-0057-9

• •    下一篇

Interfacial Strategies for Smart Slippery Surfaces

Glen McHale*, Rodrigo Ledesma-Aguilar, Gary George Wells   

  1. Smart Materials & Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, 
    Newcastle upon Tyne, NE1 8ST, UK
  • 收稿日期:2020-03-03 修回日期:2020-04-13 接受日期:2020-05-08 出版日期:2020-07-10 发布日期:2020-09-04
  • 通讯作者: Glen McHale E-mail:glen.mchale@northumbria.ac.uk, gmchale@ed.ac.uk
  • 作者简介:Glen McHale*, Rodrigo Ledesma-Aguilar, Gary George Wells

Interfacial Strategies for Smart Slippery Surfaces

Glen McHale*, Rodrigo Ledesma-Aguilar, Gary George Wells   

  1. Smart Materials & Surfaces Laboratory, Faculty of Engineering and Environment, Northumbria University, 
    Newcastle upon Tyne, NE1 8ST, UK
  • Received:2020-03-03 Revised:2020-04-13 Accepted:2020-05-08 Online:2020-07-10 Published:2020-09-04
  • Contact: Glen McHale E-mail:glen.mchale@northumbria.ac.uk, gmchale@ed.ac.uk
  • About author:Glen McHale*, Rodrigo Ledesma-Aguilar, Gary George Wells

摘要: The problem of contact line pinning on surfaces is pervasive and contributes to problems from ring stains to ice formation. Here we provide a single conceptual framework for interfacial strategies encompassing five strategies for modifying the solid-liquid interface to remove pinning and increase droplet mobility. Three biomimetic strategies are included, (i) reducing the liquid-solid interfacial area inspired by the Lotus effect, (ii) converting the liquid-solid contact to a solid-solid contact by the formation of a liquid marble inspired by how galling aphids remove honeydew, and (iii) converting the liquid-solid interface to a liquid-lubricant contact by the use of a lubricant impregnated surface inspired by the Nepenthes Pitcher plant. Two further strategies are, (iv) converting the liquid-solid contact to a liquid-vapor contact by using the Leidenfrost effect, and (v) converting the contact to a liquid-liquid-like contact using slippery omniphobic covalent attachment of a liquid-like coating (SOCAL). Using these approaches, we explain how surfaces can be designed to have smart functionality whilst retaining the mobility of contact lines and droplets. Furthermore, we show how droplets can evaporate at constant contact angle, be positioned using a Cheerios effect, transported by boundary reconfiguration in an energy invariant manner, and drive the rotation of solid components in a Leidenfrost heat engine. Our conceptual framework enables the rationale design of surfaces which are slippery to liquids and is relevant to a diverse range of applications.


关键词: superhydrophobicity, SLIPS, liquid marbles, leidenfrost, SOCAL

Abstract: The problem of contact line pinning on surfaces is pervasive and contributes to problems from ring stains to ice formation. Here we provide a single conceptual framework for interfacial strategies encompassing five strategies for modifying the solid-liquid interface to remove pinning and increase droplet mobility. Three biomimetic strategies are included, (i) reducing the liquid-solid interfacial area inspired by the Lotus effect, (ii) converting the liquid-solid contact to a solid-solid contact by the formation of a liquid marble inspired by how galling aphids remove honeydew, and (iii) converting the liquid-solid interface to a liquid-lubricant contact by the use of a lubricant impregnated surface inspired by the Nepenthes Pitcher plant. Two further strategies are, (iv) converting the liquid-solid contact to a liquid-vapor contact by using the Leidenfrost effect, and (v) converting the contact to a liquid-liquid-like contact using slippery omniphobic covalent attachment of a liquid-like coating (SOCAL). Using these approaches, we explain how surfaces can be designed to have smart functionality whilst retaining the mobility of contact lines and droplets. Furthermore, we show how droplets can evaporate at constant contact angle, be positioned using a Cheerios effect, transported by boundary reconfiguration in an energy invariant manner, and drive the rotation of solid components in a Leidenfrost heat engine. Our conceptual framework enables the rationale design of surfaces which are slippery to liquids and is relevant to a diverse range of applications.


Key words: superhydrophobicity, SLIPS, liquid marbles, leidenfrost, SOCAL