Porosity estimation using electric current measurements for paper-based microfluidics

Van Phung Mai, Cheng Hao Ku, Ruey-Jen Yang

Research output: Contribution to journalArticle

Abstract

A new method is proposed for estimating the porosity of paper by comparing the electric current passing through a wax-printed channel patterned on the paper surface with that passing through a hollow polydimethylsiloxane (PDMS) channel. To ensure the accuracy of the estimation results, the paper channel is sandwiched between two flat PDMS plates to minimize evaporation losses and replicate the surface properties of the hollow PDMS channel. It is shown that the measured current values in the PDMS and paper channels under driving voltages of 10–50 V are consistent with the results obtained from Poisson–Nernst Planck simulations. Hence, the validity of the experimental model for estimating the paper porosity is confirmed. The porosities of three commercial paper samples are estimated experimentally and compared well with the values determined from the basis weight and thickness data provided by the paper manufacturer. In general, the results confirm that the proposed method provides a low-cost and effective means of evaluating different paper materials for microfluidic paper-based analytical devices (μPADs).

Original languageEnglish
Article number59
JournalMicrofluidics and Nanofluidics
Volume23
Issue number4
DOIs
Publication statusPublished - 2019 Apr 1

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Electric current measurement
Polydimethylsiloxane
electric current
Microfluidics
Porosity
porosity
hollow
estimating
Waxes
Electric currents
waxes
Surface properties
flat plates
Evaporation
surface properties
baysilon
evaporation
Electric potential
Costs
electric potential

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Porosity estimation using electric current measurements for paper-based microfluidics",
abstract = "A new method is proposed for estimating the porosity of paper by comparing the electric current passing through a wax-printed channel patterned on the paper surface with that passing through a hollow polydimethylsiloxane (PDMS) channel. To ensure the accuracy of the estimation results, the paper channel is sandwiched between two flat PDMS plates to minimize evaporation losses and replicate the surface properties of the hollow PDMS channel. It is shown that the measured current values in the PDMS and paper channels under driving voltages of 10–50 V are consistent with the results obtained from Poisson–Nernst Planck simulations. Hence, the validity of the experimental model for estimating the paper porosity is confirmed. The porosities of three commercial paper samples are estimated experimentally and compared well with the values determined from the basis weight and thickness data provided by the paper manufacturer. In general, the results confirm that the proposed method provides a low-cost and effective means of evaluating different paper materials for microfluidic paper-based analytical devices (μPADs).",
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Porosity estimation using electric current measurements for paper-based microfluidics. / Mai, Van Phung; Ku, Cheng Hao; Yang, Ruey-Jen.

In: Microfluidics and Nanofluidics, Vol. 23, No. 4, 59, 01.04.2019.

Research output: Contribution to journalArticle

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