Abstract

This paper presents a lab-on-a-chip development method that applies the Young-Laplace equation to design the geometries of a patterned water droplet, and then using the droplet as a mold to fabricate three-dimensional polydimethylsiloxane (PDMS) channels. We demonstrate the method by designing and fabricating an on-chip funnel. We then subsequently trap beads of graded diameter in the tapered section of the funnel to make on-chip filters of controllable pore size. After packing the funnel with beads, the cutoff pore size of the fabricated filter agrees closely with our estimate. This approach provides a straight-forward, low-cost, yet powerful way to design and fabricate microfluidic devices with 3D features.

Original languageEnglish (US)
Pages (from-to)891-897
Number of pages7
JournalMicrofluidics and Nanofluidics
Volume13
Issue number6
DOIs
StatePublished - Dec 2012

Fingerprint

funnels
Molds
Pore size
Surface tension
interfacial tension
chips
beads
Lab-on-a-chip
Laplace equation
Water
Polydimethylsiloxane
Microfluidics
water
porosity
filters
microfluidic devices
Geometry
cut-off
traps
Costs

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Surface tension-controlled three-dimensional water molds : Theory and applications. / Goff, Chandra M.; Chao, Shih-Hui; Johnson, Roger H.; Meldrum, Deirdre.

In: Microfluidics and Nanofluidics, Vol. 13, No. 6, 12.2012, p. 891-897.

Research output: Contribution to journalArticle

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