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  4. 3D Patterning of Hydrogels and Cells by Multi-Component Inkjet Printing
 
conference poster not in proceedings

3D Patterning of Hydrogels and Cells by Multi-Component Inkjet Printing

Negro, Andrea
•
Pataky, Kristopher  
•
Brugger, Jürgen  
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2011
Swiss-eprint

Recapitulating the spatial and temporal complexity of tissues or organs represents one of the biggest challenges in engineering tissue-like living constructs in vitro. Inkjet printing with its high positioning precision (±1μm) and reliable droplet generation (<5% variation) should fulfill the requirements to pattern biomaterials into complex three-dimensional (3D) geometries. However, there exists no biologically relevant ink that could afford 3D shape retention after drop deposition and fast stabilization of a printed structure. To address this issue, we have been developing an alginate hydrogel-based inkjet printing platform. Alginate solutions can be reliably dispensed on a hydrogel substrate storing calcium ions that quickly diffuse into the alginate solution inducing rapid cross-linking. We characterized the crosslinking kinetics and optimized printing parameters towards homogeneous stacking of droplets. Since living tissues are multi-component entities comprised of several types of cells and extracellular environments, we then focused on optimizing the dispensing system for synchronized multi-component deposition. We successfully matched the ejection characteristics of multiple nozzles by evaluating droplet diameter, jet speed and jet angle of each nozzle for variable dispensing voltage and pulse length.. Finally, proof-of-concept experiments were conducted to successfully print living 3D structures in the form of a simplified blood vessel.

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Type
conference poster not in proceedings
Author(s)
Negro, Andrea
Pataky, Kristopher  
Brugger, Jürgen  
Lutolf, Matthias
Date Issued

2011

Note

Selected for Best Poster Award Swiss e-Print 2011

Written at

EPFL

EPFL units
LMIS1  
Event nameEvent placeEvent date
Swiss-eprint

Basel, Switzerland

December, 1-2, 2011

Available on Infoscience
December 6, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/73006
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