title: Rebounding droplet-droplet collisions on superhydrophobic surfaces: from the phenomenon to droplet logic.
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.
authors.affiliation: Department of Applied Physics, Aalto University, Espoo, Finland.
authors.forename: Henrikki
authors.initials: H
authors.lastname: Mertaniemi
authors.forename: Robert
authors.initials: R
authors.lastname: Forchheimer
authors.forename: Olli
authors.initials: O
authors.lastname: Ikkala
authors.forename: Robin H A
authors.initials: RH
authors.lastname: Ras
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D008962:Models, Theoretical; D013499:Surface Properties; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water