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Multi-dimensional manipulation of Solid/Liquid interaction

Distinguished Research Seminar Series

20221209Prof Xu DengEvent banner
  • Date

    09 Dec 2022

  • Organiser

    Department of Industrial and Systems Engineering, PolyU; Research Institute for Advanced Manufacturing (RIAM)

  • Time

    10:00 - 11:30

  • Venue

    Online via ZOOM  


Prof. Xu Deng


Meeting link will be sent to successful registrants

20221209Prof Xu DengPoster


Solid/Liquid interaction plays an important role in many research and application fields. In this presentation, we will introduce a radically new strategy that resolves the bottleneck through the creation of an unexplored gradient in surface charge density (SCD). By leveraging on a facile droplet printing on superamphiphobic surfaces as well as the fundamental understanding of the mechanisms underpinning the creation of the preferential SCD, we demonstrate the self-propulsion of droplets with a record-high velocity over an ultra-long distance without the need for additional energy input. We envision that our work enriches and extends our capability in the manipulation of droplet transport and would find numerous potential applications otherwise impossible. We will also show that robust superhydrophobicity can be realized by structuring surfaces at two different length scales, with a nanostructure design to provide water repellency and a microstructure design to provide durability. The microstructure is an interconnected surface frame containing ‘pockets’ that house highly water-repellent and mechanically fragile nanostructures. This surface frame acts as ‘armour’, preventing the removal of the nanostructures by abradants that are larger than the frame size. We apply this strategy to various substrates—including silicon, ceramic, metal and transparent glass—and show that the water repellency of the resulting superhydrophobic surfaces is preserved even after abrasion by sandpaper and by a sharp steel blade. This design strategy could also guide the development of other materials that need to retain effective self-cleaning, anti-fouling or heat-transfer abilities in harsh operating environments.


  1. QQ. Sun, ZK. Wang*, HJ. Butt*, X. Deng* et al., Surface charge printing for programmed droplet transport, Nature Materials 2019, 18, 936-941.
  2. DH. Wang, R. Ras*and X. Deng* et al., Design of robust superhydrophobic surfaces, Nature 2020, 582, 55-59.
  3. JN. Song, X. Deng* et al., Polymeric Microparticles Generated via ConfinementFree Fluid Instability, Advanced Materials 2021, 33, 2007154.
  4. WL. Zhang, Xu Deng* et al., Robust superhydrophobicity: mechanisms and strategies, Chemical Society Reviews 2021, 50, 4031-4061.
  5. X Deng, D Vollmer* et al. Candle Soot as a Template for a Transparent Robust Superamphiphobic Coating, Science 2012, 335, 67-70


Keynote Speaker

Prof. Xu Deng

Prof. Xu Deng

Institute of Fundamental and Frontier Sciences, 
University of Electronic Science and Technology of China
Chengdu 610054, China

Dr. Xu Deng received his Ph.D. in 2013 from the Max Planck Institute for Polymer Research. In 2014, Dr. Deng served as a postdoctoral fellow at UC Berkeley and Lawrence Berkeley National Laboratory. In 2015, he joined the University of Electronic Science and Technology of China as a professor. In 2017, He was pointed by the president of Max Planck Institute as the head of Max Planck Partner Group at UESTC. Dr. Deng is interested in understanding wetting dynamics and physical chemistry at interfaces. He has published more than 80 articles as the first author or corresponding author in leading journals such as Science, Nature, Nature Materials, Nature Communication, PRL, Angew Chem, Advanced Materials, to name a few. In 2021, Dr. Deng was admitted as the Fellow of the Royal Society of Chemistry (FRSC). In 2022, Dr. Deng has been awarded the Friedrich Wilhelm Bessel Research Award of the Alexander von Humboldt Foundation, Germany

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