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Paper-based microfluidics: fabrication technique and dynamics of capillary-driven surface flow
Joel Songok1, Mikko Tuominen, Hannu Teisala
1Laboratory of Paper Coating and Converting and Center for Functional Materials, Abo Akademi University , Porthaninkatu 3, 20500 Åbo/Turku, Finland.
ACS Applied Materials & Interfaces
|October 23, 2014
Summary
This study presents a new method for creating paper-based microfluidic devices using titanium dioxide nanoparticles and UV light. These devices enable controlled liquid movement for low-cost diagnostics.
Area of Science:
- Materials Science
- Microfluidics
- Analytical Chemistry
Background:
- Paper-based devices offer a low-cost, portable alternative for diagnostics.
- Fabricating microfluidic channels on paper requires precise surface modification.
Purpose of the Study:
- To develop a two-step fabrication process for 2D microfluidic channels on paper.
- To investigate the flow dynamics of various liquids within these channels.
Main Methods:
- Hydrophobic paper surface created using TiO2 nanoparticle coating via liquid flame spray.
- Hydrophilic patterns generated by UV irradiation through a photomask.
- Studied flow dynamics of five model liquids with varying surface tensions and viscosities.
Main Results:
- Liquid front advancement follows the power law l=Zt^0.5.
- Low-viscosity liquid flow depends on channel width and droplet volume.
- High-viscosity liquid flow is primarily governed by viscous forces.
Conclusions:
- The developed method enables controlled liquid transport on paper-based microfluidic devices.
- Understanding liquid flow dynamics is crucial for optimizing device performance.
- This technique holds promise for developing advanced, low-cost diagnostic tools.
Keywords:
capillary flowpaper-based microfluidicssurface wettability controltwo-dimensional lateral flow
