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Proceedings Paper

Structuring unbreakable hydrophobic barriers in paper
Author(s): Tobias M. Nargang; Frederik Kotz; Bastian E. Rapp
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Paper Abstract

Hydrophobic barriers are one of the key elements of microfluidic paper based analytical devices (μPADs).μPADs are simple and cost efficient and they can be carried out without the need of high standard laboratories. To carry out such a test a method is needed to create stable hydrophobic barriers. Commonly used methods like printing wax or polystyrene have the major drawback that these barriers are stiff and break if bended which means they will no longer be able to retain a liquid sample. Here we present silanes to structure hydrophobic barriers via polycondensation and show a silanization method which combines the advantages of flexible silane/siloxane layers with the short processing times of UV-light based structuring. The barriers are created by using methoxy silanes which are mixed with a photo acid generator (PAG) as photoinitiator. Also a photosensitizer was given to the mixture to increase the effectiveness of the PAG. After the PAG is activated by UV-light the silane is hydrolyzed and coupled to the cellulose via polycondensation. The created hydrophobic barriers are highly stable and do not break if being bended.

Paper Details

Date Published: 19 February 2018
PDF: 4 pages
Proc. SPIE 10491, Microfluidics, BioMEMS, and Medical Microsystems XVI, 104910H (19 February 2018); doi: 10.1117/12.2288335
Show Author Affiliations
Tobias M. Nargang, Karlsruher Institut für Technologie (Germany)
Frederik Kotz, Karlsruher Institut für Technologie (Germany)
Bastian E. Rapp, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 10491:
Microfluidics, BioMEMS, and Medical Microsystems XVI
Bonnie L. Gray; Holger Becker, Editor(s)

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