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Suspended liquid subtractive lithography: printing three dimensional channels directly into uncured polymeric matrices
Author(s): Dorothea Helmer; Stephan Voss; Kai Sachsenheimer; Frederik Kotz; Bastian E. Rapp
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Paper Abstract

Polydimethylsiloxane (PDMS) remains the polymer of choice for many microfluidic applications. Standard soft lithographic methods are based on channel molding and consecutive bonding of a lid. We have recently shown the production of smooth, circular three-dimensional channels by zero-gravity printing of surfactant liquid threads into PDMS matrices, a technique we term “Suspended Liquid Subtractive Lithography” (SLSL). A commercial cartesian 3D printer was used for the experiments but was shown to be not ideal due to the movement of the printer bed, which causes distortions in the soft SLSL structures. In this work, a new generation of printers was designed, based on a delta printer system. The printer was equipped with a precision syringe pump and a solenoid valve which prevents dripping of the surfactant off the needle. Printing parameters such as the printing speed and channel diameters were evaluated. It was found that channels be printed with high fidelity over high lengths of more than 80 cm.

Paper Details

Date Published: 4 March 2019
PDF: 7 pages
Proc. SPIE 10875, Microfluidics, BioMEMS, and Medical Microsystems XVII, 1087508 (4 March 2019); doi: 10.1117/12.2507984
Show Author Affiliations
Dorothea Helmer, Karlsruher Institut für Technologie (Germany)
Stephan Voss, Karlsruher Institut für Technologie (Germany)
Kai Sachsenheimer, 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. 10875:
Microfluidics, BioMEMS, and Medical Microsystems XVII
Bonnie L. Gray; Holger Becker, Editor(s)

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