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Microfluidics and Nanofluidics

, Volume 13, Issue 3, pp 399–409 | Cite as

Microfluidic motion for a direct investigation of solvent interactions with PDMS microchannels

  • Monica BiancoEmail author
  • Ilenia Viola
  • Miriam Cezza
  • Francesca Pietracaprina
  • Giuseppe Gigli
  • Rosaria Rinaldi
  • Valentina Arima
Research Paper

Abstract

Solid surface/liquid interactions play an important role in microfluidics and particularly in manipulation of films, drops and bubbles, a basic requirement for a number of lab-on-chip applications. The behavior of solvents in coated microchannels is difficult to be predicted considering theories; therefore, experimental methods able to estimate the properties at the interface in real time and during the operational regime are amenable. Here, we propose to use an experimental setup to evaluate the effective dynamics of solvents inside PDMS microchannels. The influence of the solvent properties as well as of the channel wall’s wettability on the fluid movements was evaluated. Modification of the channel properties was achieved by introducing Teflon coatings that allow producing stable hydrophobic microchannel walls. The results were fitted according to Washburn-type power-law and compared with theoretical calculations of the parameter β that expresses the dependence of capillary dynamics on surface tension γ, liquid viscosity η, contact angles θ and the hydraulic radius R H. A comparison between the calculated and the experimental values reveled that parameters other than the contemplated ones influenced the measurements. The main parameter that affects the flow of solvents such as water, methanol ethanol, dimethylformamide, acetonitrile and acetone was found to be the γ/η ratio. Considering these results, the investigation tool described here is believed to be promising to predict the dynamics of common organic solvents inside integrated functional fluidic devices and to accurately control solvent flow, particularly in capillary-driven pumpless systems, a basic requirement for widening the application range of PDMS lab-on-chip devices.

Keywords

Microfluidics PDMS microchannels Teflon coating Washburn power law 

Notes

Acknowledgments

The authors acknowledge the EU project “ROC”, grant agreement no. 213803 for financial support and Stefania D’Amone and Elisabetta Perrone for the technical support.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Monica Bianco
    • 1
    Email author
  • Ilenia Viola
    • 1
    • 2
  • Miriam Cezza
    • 1
  • Francesca Pietracaprina
    • 1
  • Giuseppe Gigli
    • 1
    • 2
    • 3
  • Rosaria Rinaldi
    • 1
  • Valentina Arima
    • 1
  1. 1.National Nanotechnology Laboratory, CNR-Istituto Nanoscienze, U.O.S. Lecce–Distretto Tecnologico ISUFIUniversità del SalentoLecceItaly
  2. 2.National Nanotechnology Laboratory, CNR-Istituto Nanoscienze, c/o Dipartimento di FisicaUniversità La SapienzaRomeItaly
  3. 3.Dip. Ingegneria InnovazioneUniversità del SalentoLecceItaly

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