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

12 Citations (Scopus)

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

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knives
Polyethylene
wire
droplets
Wire
polyethylene
Water
Polytetrafluoroethylene
Isoelectric Focusing
Glass
Zinc
Copper
water
energy
isoelectric focusing
glass
copper
zinc
spatial distribution
Free energy

ASJC Scopus subject areas

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

Cite this

Cutting a Drop of Water Pinned by Wire Loops Using a Superhydrophobic Surface and Knife. / Yanashima, Ryan; Garcia, Antonio; Aldridge, James; Weiss, Noah; Hayes, Mark; Andrews, James H.

In: PLoS One, Vol. 7, No. 9, e45893, 24.09.2012.

Research output: Contribution to journalArticle

Yanashima, Ryan ; Garcia, Antonio ; Aldridge, James ; Weiss, Noah ; Hayes, Mark ; Andrews, James H. / Cutting a Drop of Water Pinned by Wire Loops Using a Superhydrophobic Surface and Knife. In: PLoS One. 2012 ; Vol. 7, No. 9.
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