Explosive Pancake Bouncing on Hot Superhydrophilic Surfaces

Minjie Liu, Hanheng Du, Yaqi Cheng, Huanxi Zheng, Yuankai Jin, Suet To, Steven Wang, Zuankai Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

The rapid detachment of liquid droplets from engineered surfaces in the form of complete rebound, pancake bouncing, or trampolining has been extensively studied over the past decade and is of practical importance in many industrial processes such as self-cleaning, anti-icing, energy conversion, and so on. The spontaneous trampolining of droplets needs an additional low-pressure environment and the manifestation of pancake bouncing on superhydrophobic surfaces requires meticulous control of macrotextures and impacting velocity. In this work, we report that the rapid pancake-like levitation of impinging droplets can be achieved on superhydrophilic surfaces through the application of heating. In particular, we discovered explosive pancake bouncing on hot superhydrophilic surfaces made of hierarchically non-interconnected honeycombs, which is in striking contrast to the partial levitation of droplets on the surface consisting of interconnected microposts. This enhanced droplet bouncing phenomenon, characterized by a significant reduction in contact time and increase in the bouncing height, is ascribed to the production and spatial confinement of pressurized vapor in non-interconnected structures. The manifestation of pancake bouncing on the superhydrophilic surface rendered by a bottom-to-up boiling process may find promising applications such as the removal of trapped solid particles.

Original languageEnglish
Pages (from-to)24321–24328
Number of pages8
JournalACS Applied Materials and Interfaces
Volume13
Issue number20
DOIs
Publication statusPublished - 17 May 2021

Keywords

  • boiling
  • non-interconnected structure
  • pancake bouncing
  • rapid detachment
  • superhydrophilic
  • vapor pressure

ASJC Scopus subject areas

  • Materials Science(all)

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