Magnetic movement of biological fluid droplets

Antonio Garcia, Ana Egatz-Gómez, Solitaire A. Lindsay, P. Domínguez-García, Sonia Melle, Manuel Marquez, Miguel A. Rubio, S. T. Picraux, Dongqing Yang, P. Aella, Mark Hayes, Devens Gust, Suchera Loyprasert, Terannie Vazquez-Alvarez, Joseph Wang

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


Magnetic fields can be used to control the movement of aqueous drops on non-patterned, silicon nanowire superhydrophobic surfaces. Drops of aqueous and biological fluids are controlled by introducing magnetizable carbonyl iron microparticles into the liquid. Key elements of operations such as movement, coalescence, and splitting of water and biological fluid drops, as well as electrochemical measurement of an analyte are demonstrated. Superhydrophobic surfaces were prepared using vapor-liquid-solid (VLS) growth systems followed by coating with a perfluorinated hydrocarbon molecule. Drops were made from aqueous and biological fluid suspensions with magnetizable microparticle concentrations ranging from 0.1 to 10 wt%.

Original languageEnglish (US)
Pages (from-to)238-243
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Issue number1 SPEC. ISS.
StatePublished - Apr 2007


  • Albumin
  • Carbonyl iron microparticle
  • Drop
  • Microfluidics
  • Nanowire
  • Paramagnetic particle
  • Serum
  • Superhydrophobic surface

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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