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Micro-reactive Inkjet Printing of Three-Dimensional Hydrogel Structures

Published online by Cambridge University Press:  28 December 2017

Mei Ying Teo
Affiliation:
Department of Mechanical Engineering, The University of Auckland, 20, Symonds Street, Auckland 1010, New Zealand
Logan Stuart
Affiliation:
Department of Mechanical Engineering, The University of Auckland, 20, Symonds Street, Auckland 1010, New Zealand
Kean C. Aw
Affiliation:
Department of Mechanical Engineering, The University of Auckland, 20, Symonds Street, Auckland 1010, New Zealand
Jonathan Stringer*
Affiliation:
Department of Mechanical Engineering, The University of Auckland, 20, Symonds Street, Auckland 1010, New Zealand
*
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Abstract

Inkjet printing, of the researched techniques for printing of hydrogels, gives perhaps the best potential control over the shape and composition of the final hydrogel. It is, however, fundamentally limited by the low viscosity of the printed ink, which means that crosslinking of the hydrogel must take place after printing. This can be particularly problematic for hydrogels as the slow diffusion of the crosslinking species through the gel results in very slow vertical printing speeds, leading to dehydration of the gel and (if simultaneously deposited) cell death. Previous attempts to overcome this limitation have involved the sequential printing of alternating layers to reduce the diffusion distance of reactive species. In this work we demonstrate an alternative approach where the crosslinker and gelator are printed so that they collide with each other before impinging upon the substrate, thereby facilitating hydrogel synthesis and patterning in a single step. Using a model system based upon sodium alginate and calcium chloride a series of 3D structures are demonstrated, with vertical printing speeds significantly faster than previous work. The droplet collision is shown to increase advective mixing before impact, reducing the time taken for gelation to occur, and improving definition of printed patterns. With the facile addition of more printing inks, this approach also enables spatially varied composition of the hydrogel, and work towards this will be discussed.

Type
Articles
Copyright
Copyright © Materials Research Society 2017 

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