Jump to main content
Jump to site search

Issue 21, 2009
Previous Article Next Article

Patterning of superhydrophobic paper to control the mobility of micro-liter drops for two-dimensional lab-on-paper applications

Author affiliations

Abstract

Superhydrophobic paper substrates were patterned with high surface energy black ink using commercially available desktop printing technology. The shape and size of the ink islands were designed to control the adhesion forces on water drops in two directions, parallel (‘drag-adhesion’) and perpendicular (‘extensional-adhesion’) to the substrate. Experimental data on the adhesion forces shows good agreement with classical models for ‘drag’ (Furmidge equation) and ‘extensional’ adhesion (modified Dupré equation). The tunability of the two adhesion forces was used to implement four basic unit operations for the manipulation of liquid drops on the paper substrates: storage, transfer, mixing and sampling. By combining these basic functionalities it is possible to design simple two-dimensional lab-on-paper (LOP) devices. In our 2D LOP prototype, liquid droplets adhere to the porous substrate, rather than absorbing into the paper; as a result, liquid droplets remain accessible for further quantitative testing and analysis, after performing simple qualitative on-chip testing. In addition, the use of commercially available desktop printers and word processing software to generate ink patterns enable end users to design LOP devices for specific applications.

Graphical abstract: Patterning of superhydrophobic paper to control the mobility of micro-liter drops for two-dimensional lab-on-paper applications

Back to tab navigation

Publication details

The article was received on 19 May 2009, accepted on 24 Jul 2009 and first published on 05 Aug 2009


Article type: Paper
DOI: 10.1039/B909868B
Citation: Lab Chip, 2009,9, 3066-3075
  •   Request permissions

    Patterning of superhydrophobic paper to control the mobility of micro-liter drops for two-dimensional lab-on-paper applications

    B. Balu, A. D. Berry, D. W. Hess and V. Breedveld, Lab Chip, 2009, 9, 3066
    DOI: 10.1039/B909868B

Search articles by author

Spotlight

Advertisements