Interfacial Strategies for Smart Slippery Surfaces  

作　　者：Glen McHale Rodrigo Ledesma-Aguilar Gary George Wells 

机构地区：[1]Smart Materials&Surfaces Laboratory,Faculty of Engineering and Environment,Northumbria University,Newcastle upon Tyne,NE18ST,UK

出　　处：《Journal of Bionic Engineering》2020年第4期633-643,共11页仿生工程学报（英文版）

基　　金：Many co-workers contributed to the work described and to development of the ideas including,Dr.Prashant Agrawal,Mr Steven Armstrong,Dr.Linzi Dodd,Dr.Jian(James)H.Guan,Dr.Elfego Ruiz-Gutierrez,Dr.Halim Kusumaatmaja,Dr.Bethany V.Orme,Professor Khellil Sefiane,Dr.Ciro Semprebon,Professor Dominic Vella,Professor David Wood and Dr.Ben B.Xu.This work was financially supported in part by the UK Engineering&Physical Sciences Research Council(EPSRC grants EP/P005896/1 and EP/P005705/1)and Reece Innovation Ltd.

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 

分 类 号：Q81[生物学—生物工程]