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Rheological behavior of fugitive organic inks for direct-write assembly

Daniel Therriault, Scott R. White and Jennifer A. Lewis

Article (2007)

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The rheological behavior of a fugitive organic ink tailored for direct-write assembly of 3D microfluidic devices is investigated. Rheological experiments are carried out to probe the shear storage and loss moduli as well as the complex viscosity as a function of varying temperature, frequency and stress amplitude. Master curves of these functions are assembled using time-temperature superposition. The fugitive ink, comprised of two organic phases, possesses an equilibrium shear elastic modulus nearly two orders of magnitude higher than that of a commercial reference ink at room temperature and a peak in the relaxation spectrum nearly six orders of magnitude longer in time scale. The self-supporting nature of extruded ink filaments is characterized by direct video imaging. Comparison of the experimentally observed behavior to numerical predictions based on Euler-Bernoulli viscoelastic beam analysis yield excellent agreement for slender filaments.

Uncontrolled Keywords

direct-write; viscoelastic material; organic ink; structural behavior; microfabrication; 3-dimensional microvascular networks

Subjects: 1800 Chemical engineering > 1808 Rheology and processing
Department: Department of Mechanical Engineering
Research Center: CREPEC - Center for Applied Research on Polymers and Composites
Funders: AFOSR Aerospace and Materials Science Directorate, U.S. Department of Energy, Division of Materials Science, Frederick Seitz Materials Research Laboratory (UIUC), NSF Center for Direct- ed Assembly of Nanostructures
Grant number: F49620-03-1-0179, FG02-91ER45439, MR- 01-17779
PolyPublie URL: https://publications.polymtl.ca/5150/
Journal Title: Applied Rheology (vol. 17, no. 1)
Publisher: Walter de Gruyter
DOI: 10.1515/arh-2007-0001
Official URL: https://doi.org/10.1515/arh-2007-0001
Date Deposited: 15 Nov 2022 16:58
Last Modified: 30 Sep 2023 17:37
Cite in APA 7: Therriault, D., White, S. R., & Lewis, J. A. (2007). Rheological behavior of fugitive organic inks for direct-write assembly. Applied Rheology, 17(1), 10112-10121. https://doi.org/10.1515/arh-2007-0001


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