Fabrication of suspended electrokinetic microchannels from directly written sacrificial polymer fibers

Scott M. Berry, Thomas J. Roussel, Scott D. Cambron, Robert W. Cohn, Robert S. Keynton

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Freely suspended microchannels with diameters ranging from4 to 100 lmwere fabricated by utilizing directly written PMMA fibers as sacrificial structures. These precisely oriented fibers served as scaffolds aroundwhich thin cylinders of glass were deposited (via sputtering), followed by a conformal coating of Parylene to augment the mechanical integrity of the structures. After coating, the PMMA fibers were dissolved to yield suspended, hollow conduits that were hydrophilic and robust. The freely suspended channels were loaded with a buffer solution containing charged particles, which were subsequently electrokinetically manipulated and velocities quantified using microparticle image velocimetry (μPIV). Mobilities within 1.3 % of those observed in conventional, planar microchannels were recorded.

Original languageEnglish
Pages (from-to)451-459
Number of pages9
JournalMicrofluidics and Nanofluidics
Issue number3
StatePublished - Sep 2012

Bibliographical note

Funding Information:
Acknowledgments This investigation was funded by the National Science Foundation NIRT Program (ECCS-0506941) and NSF PFI Program (EEC-0438604).

Copyright 2012 Elsevier B.V., All rights reserved.


  • Direct write
  • Electroosmotic flow
  • Fabrication
  • Microchannels
  • Suspended

ASJC Scopus subject areas

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


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