title: Inkjet printed silver electrodes on macroporous paper for a paper-based isoelectric focusing device.
abstract: We demonstrate a combined printing process utilizing inkjet printing of silver electrodes and solid-ink technology for printing hydrophobic wax barriers for fabricating paper microfluidic devices with integrated electrodes. Optimized printing parameters are given for achieving conducting silver lines on the top of macroporous chromatography paper down to 250μm-300μm resolution. Electrical characterization and wicking experiments demonstrate that the printed silver patterns are simultaneously conductive and porous enough to allow reliable capillary wicking across the electrodes. The combined wax and silver printing method is used for fabrication of paper microfluidic isoelectric focusing devices for separation and concentration of proteins.
authors.affiliation: Department of Materials Science and Engineering, School of Chemical Technology, Aalto University , Aalto FI-00076, Finland.
authors.forename: Cristina
authors.initials: C
authors.lastname: Gaspar
authors.affiliation: Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki , Helsinki FI-00014, Finland.
authors.forename: Tiina
authors.identifier: 0000-0002-0788-1301
authors.initials: T
authors.lastname: Sikanen
authors.affiliation: Department of Materials Science and Engineering, School of Chemical Technology, Aalto University , Aalto FI-00076, Finland.
authors.forename: Sami
authors.initials: S
authors.lastname: Franssila
authors.affiliation: Department of Materials Science and Engineering, School of Chemical Technology, Aalto University , Aalto FI-00076, Finland.
authors.forename: Ville
authors.initials: V
authors.lastname: Jokinen