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.
|Number of pages||9|
|Journal||Microfluidics and Nanofluidics|
|State||Published - Sep 2012|
Bibliographical noteFunding 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
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Materials Chemistry