Topography-Directed Hot-Water Super-Repellent Surfaces

Zhu, Pingan1,2; Chen, Rifei1,3; Wang, Liqiu1,2

2019-07-30

10.1002/advs.201900798

ADVANCED SCIENCE   影响因子和分区

21983844

2198-3844

Natural and artificial super-repellent surfaces are frequently textured with pillar-based discrete structures rather than hole-based continuous ones because the former exhibits lower adhesion from the reduced length of the three-phase contact line. Counterintuitively, here, the unusual topographic effects are discovered on hot-water super-repellency where the continuous microcavity surface outperforms the discrete microneedle/micropillar surface. This anomaly arises from the different dependencies of liquid-repellency stability on the surface structure and water temperature in the two topographies. The unexpected wetting dynamics are interpreted by determining timescales for droplet evaporation, vapor condensation, and droplet bouncing. The associated heat transfer process is unique to the wetting states and remarkably distinct from each other in the two topographies. It is envisioned that hot-water super-repellent microcavity surfaces will be advantageous for a variety of applications, especially when both self-cleaning and thermal insulation are imperative, such as clothing for scald protection and digital microfluidics for exothermic reactions.

heat transfer liquid repellency structure-property relationship wetting dynamics

SCI ; EI

英语

其他

University of Hong Kong[URC 201511159108]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Multidisciplinary ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000477798700001

WILEY

20193207294728

Digital microfluidics ; Drop formation ; Heat transfer ; Magnetic bubbles ; Microcavities ; Surface structure ; Textures ; Thermal insulation ; Topography ; Water

Heat Insulating Materials:413.2 ; Microfluidics:632.5.1 ; Heat Transfer:641.2 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Electronic Components and Tubes:714 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

Web of Science

1.Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
2.HKU, ZIRI, Hangzhou 311300, Zhejiang, Peoples R China
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Zhu, Pingan,Chen, Rifei,Wang, Liqiu. Topography-Directed Hot-Water Super-Repellent Surfaces[J]. ADVANCED SCIENCE,2019,6(18).

Zhu, Pingan,Chen, Rifei,&Wang, Liqiu.(2019).Topography-Directed Hot-Water Super-Repellent Surfaces.ADVANCED SCIENCE,6(18).

Zhu, Pingan,et al."Topography-Directed Hot-Water Super-Repellent Surfaces".ADVANCED SCIENCE 6.18(2019).