Cutting a Drop of Water Pinned by Wire Loops Using a Superhydrophobic Surface and Knife

Ryan Yanashima, Antonio Garcia, James Aldridge, Noah Weiss, Mark Hayes, James H. Andrews

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

A water drop on a superhydrophobic surface that is pinned by wire loops can be reproducibly cut without formation of satellite droplets. Drops placed on low-density polyethylene surfaces and Teflon-coated glass slides were cut with superhydrophobic knives of low-density polyethylene and treated copper or zinc sheets, respectively. Distortion of drop shape by the superhydrophobic knife enables a clean break. The driving force for droplet formation arises from the lower surface free energy for two separate drops, and it is modeled as a 2-D system. An estimate of the free energy change serves to guide when droplets will form based on the variation of drop volume, loop spacing and knife depth. Combining the cutting process with an electrofocusing driving force could enable a reproducible biomolecular separation without troubling satellite drop formation.

Original languageEnglish (US)
Article numbere45893
JournalPloS one
Volume7
Issue number9
DOIs
StatePublished - Sep 24 2012

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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