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Advanced Materials

Rebounding Droplet-Droplet Collisions on Superhydrophobic Surfaces: from the Phenomenon to Droplet Logic

Authors

  • Henrikki Mertaniemi,

    1. Molecular Materials, Department of Applied Physics, Aalto University (formerly Helsinki University of Technology), FIN-00076 Espoo, Finland
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  • Robert Forchheimer,

    1. Information Coding, Department of Electrical Engineering, Linköping University, SE 581 83 Linköping, Sweden
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  • Olli Ikkala,

    1. Molecular Materials, Department of Applied Physics, Aalto University (formerly Helsinki University of Technology), FIN-00076 Espoo, Finland
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  • Robin H. A. Ras

    Corresponding author
    1. Molecular Materials, Department of Applied Physics, Aalto University (formerly Helsinki University of Technology), FIN-00076 Espoo, Finland
    • Molecular Materials, Department of Applied Physics, Aalto University (formerly Helsinki University of Technology), FIN-00076 Espoo, Finland.
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Abstract

When water droplets impact each other while traveling on a superhydrophobic surface, we demonstrate that they are able to rebound like billiard balls. We present elementary Boolean logic operations and a flip-flop memory based on these rebounding water droplet collisions. Furthermore, bouncing or coalescence can be easily controlled by process parameters. Thus by the controlled coalescence of reactive droplets, here using the quenching of fluorescent metal nanoclusters as a model reaction, we also demonstrate an elementary operation for programmable chemistry.

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