Superhydrophobic nanowire surfaces for drop movement using magnetic fields

Ana Egatz-Gomez, Sonia Melle, Antonio A. García, Solitaire Lindsay, Miguel A. Rubio, Pablo Domínguez, S. T. Picraux, J. L. Taraci, Teresa Clement, Mark Hayes, Devens Gust

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present a novel method to control water drop movement on superhydrophobic surfaces through magnetic fields. Water drops with paramagnetic particles can be moved on fractal Si-nanowire superhydrophobic surfaces at high speeds by displacing a magnet. A drop pinned to a surface defect can be combined with another drop containing paramagnetic particles thus allowing movement of the newly formed drop. A drop can also be split using two magnetic fields. Under a magnetic field, paramagnetic particles form chain-like clusters. The movement generating force appears as a consequence of chains pushing against the drop skin at the drop bottom, with chains acting as a lever and drop surface tension as a fulcrum. Our findings demonstrate the feasibility of using magnetic fields to move, combine and split aqueous drops on non-patterned superhydrophobic surfaces with the only driving force of magnetic fields, which appears as a promising way to manipulate small discrete amounts of water.

Original languageEnglish
Title of host publication2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings
Pages501-504
Number of pages4
Publication statusPublished - Dec 12 2006
Event2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings - Boston, MA, United States
Duration: May 7 2006May 11 2006

Publication series

Name2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings
Volume2

Other

Other2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings
CountryUnited States
CityBoston, MA
Period5/7/065/11/06

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Keywords

  • Droplet
  • Magnetic field
  • Microfluidics
  • Superhydrophobic surfaces

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Egatz-Gomez, A., Melle, S., García, A. A., Lindsay, S., Rubio, M. A., Domínguez, P., Picraux, S. T., Taraci, J. L., Clement, T., Hayes, M., & Gust, D. (2006). Superhydrophobic nanowire surfaces for drop movement using magnetic fields. In 2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings (pp. 501-504). (2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings; Vol. 2).