Suspended liquid subtractive lithography: printing three dimensional channels directly into uncured polymeric matrices

Dorothea Helmer; Stephan Voss; Kai Sachsenheimer; Frederik Kotz; Bastian E. Rapp

doi:10.1117/12.2507984

4 March 2019 Suspended liquid subtractive lithography: printing three dimensional channels directly into uncured polymeric matrices

Dorothea Helmer, Stephan Voss, Kai Sachsenheimer, Frederik Kotz, Bastian E. Rapp

Author Affiliations +

Proceedings Volume 10875, Microfluidics, BioMEMS, and Medical Microsystems XVII; 1087508 (2019) https://doi.org/10.1117/12.2507984
Event: SPIE BiOS, 2019, San Francisco, California, United States

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.

Citation Download Citation

Dorothea Helmer, Stephan Voss, Kai Sachsenheimer, Frederik Kotz, and Bastian E. Rapp "Suspended liquid subtractive lithography: printing three dimensional channels directly into uncured polymeric matrices", Proc. SPIE 10875, Microfluidics, BioMEMS, and Medical Microsystems XVII, 1087508 (4 March 2019); https://doi.org/10.1117/12.2507984

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KEYWORDS

Printing

3D printing

Capillaries

Liquids

Lithography

Microfluidics

Polymers

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