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Paper-based microfluidics: fabrication technique and dynamics of capillary-driven surface flow.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2014 Nov 26; Vol. 6 (22), pp. 20060-6. Date of Electronic Publication: 2014 Nov 04. - Publication Year :
- 2014
-
Abstract
- Paper-based devices provide an alternative technology for simple, low-cost, portable, and disposable diagnostic tools for many applications, including clinical diagnosis, food quality control, and environmental monitoring. In this study we report a two-step fabrication process for creating two-dimensional microfluidic channels to move liquids on a hydrophobized paper surface. A highly hydrophobic surface was created on paper by TiO2 nanoparticle coating using a high-speed, roll-to-roll liquid flame spray technique. The hydrophilic pattern was then generated by UV irradiation through a photomask utilizing the photocatalytic property of TiO2. The flow dynamics of five model liquids with differing surface tensions 48-72 mN·m(-1) and viscosities 1-15 mN·m(-2) was studied. The results show that the liquid front (l) in a channel advances in time (t) according to the power law l=Zt0.5 (Z is an empirical constant which depend on the liquid properties and channel dimensions). The flow dynamics of the liquids with low viscosity show a dependence on the channel width and the droplet volume, while the flow of liquids with high viscosity is mainly controlled by the viscous forces.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 6
- Issue :
- 22
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 25336235
- Full Text :
- https://doi.org/10.1021/am5055806