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, John 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
Volume2
Publication statusPublished - 2006
Event2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings - Boston, MA, United States
Duration: May 7 2006May 11 2006

Other

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

Fingerprint

Nanowires
Magnetic fields
Water
Surface defects
Fractals
Magnets
Surface tension
Skin

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., ... Gust, J. D. (2006). Superhydrophobic nanowire surfaces for drop movement using magnetic fields. In 2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings (Vol. 2, pp. 501-504)

Superhydrophobic nanowire surfaces for drop movement using magnetic fields. / Egatz-Gomez, Ana; Melle, Sonia; García, Antonio A.; Lindsay, Solitaire; Rubio, Miguel A.; Domínguez, Pablo; Picraux, S. T.; Taraci, J. L.; Clement, Teresa; Hayes, Mark; Gust, John Devens.

2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings. Vol. 2 2006. p. 501-504.

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

Egatz-Gomez, A, Melle, S, García, AA, Lindsay, S, Rubio, MA, Domínguez, P, Picraux, ST, Taraci, JL, Clement, T, Hayes, M & Gust, JD 2006, Superhydrophobic nanowire surfaces for drop movement using magnetic fields. in 2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings. vol. 2, pp. 501-504, 2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings, Boston, MA, United States, 5/7/06.
Egatz-Gomez A, Melle S, García AA, Lindsay S, Rubio MA, Domínguez P et al. Superhydrophobic nanowire surfaces for drop movement using magnetic fields. In 2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings. Vol. 2. 2006. p. 501-504
Egatz-Gomez, Ana ; Melle, Sonia ; García, Antonio A. ; Lindsay, Solitaire ; Rubio, Miguel A. ; Domínguez, Pablo ; Picraux, S. T. ; Taraci, J. L. ; Clement, Teresa ; Hayes, Mark ; Gust, John Devens. / Superhydrophobic nanowire surfaces for drop movement using magnetic fields. 2006 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2006 Technical Proceedings. Vol. 2 2006. pp. 501-504
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AU - Domínguez, Pablo

AU - Picraux, S. T.

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AU - Hayes, Mark

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AB - 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.

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