title: Effect of wetting on capillary pumping in microchannels.
abstract: We investigate capillary pumping in microchannels both experimentally and numerically. Putting two droplets of different sizes at the in/outlet of a microchannel, there will in general be a flow from the smaller droplet to the larger one due to the Laplace pressure difference. We show that an unusual flow from a larger droplet into a smaller one is possible by manipulating the wetting properties, notably the contact line pinning. In addition, we propose a way to actively control the flow by electrowetting.
authors.affiliation: Institute for Advanced Studies in Basic Sciences, Zanjan 45195-1159, Iran.
authors.forename: Arman
authors.initials: A
authors.lastname: Javadi
authors.forename: Mehdi
authors.initials: M
authors.lastname: Habibi
authors.forename: Fereshte Samadi
authors.initials: FS
authors.lastname: Taheri
authors.forename: Sébastien
authors.initials: S
authors.lastname: Moulinet
authors.forename: Daniel
authors.initials: D
authors.lastname: Bonn