Visible LED-based instrumentation for photometric determination of electroosmotic flow in microchannels
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Data
2011-01
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Resumo
An instrumental setup for electroosmotic flow (EOF) determination in microfluidic devices is
described. The system is based on a trinocular microscope and an integrated photodiode OPT101.
The radiation was provided by a high-intensity white LED. For the determinations, patent blue V and
methylene blue aqueous solutions were used. The setup was applied for EOF monitoring in hybrid
toner/glass and PDMS microchips. For the toner/glass device, the EOF mobility was determined
to be (5.75 ± 0.01) 10-4 cm2 V-1 s-1 at pH 7.0. For PDMS devices the measured EOF mobility was
(3.2 ± 0.1) 10‑4 cm2 V‑1 s‑1. Reproducible measurements were obtained in all experiments, which
produced results with small errors. The proposed method was compared to the conventional
current monitoring method.
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Electroosmotic flow, µTAS, Lab-on-a-chip, Photometric methods, Microfluidic devices
Citação
SILVA, José Alberto Fracassi da et al. Visible LED-based instrumentation for photometric determination of electroosmotic flow in microchannels. Journal of the Brazilian Chemical Society, Campinas, v. 22, n. 4, p. 736-740, Jan. 2011.