Improved fabrication of melt electrospun tissue engineering scaffolds using direct writing and advanced electric field control

Ristovski, Nikola, Bock, Nathalie, Liao, Sam, Powell, Sean K., Ren, Jiongyu (Edward), Kirby, Giles, Blackwood, Keith A., & Woodruff, Maria A. (2015) Improved fabrication of melt electrospun tissue engineering scaffolds using direct writing and advanced electric field control. Biointerphases, 10(1), pp. 1-10.

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Abstract

Direct writing melt electrospinning is an additive manufacturing technique capable of the layer-by-layer fabrication of highly ordered 3d tissue engineering scaffolds from micron-diameter fibres. The utility of these scaffolds, however, is limited by the maximum achievable height of controlled fibre deposition, beyond which the structure becomes increasingly disordered. A source of this disorder is charge build-up on the deposited polymer producing unwanted coulombic forces. In this study we introduce a novel melt electrospinning platform with dual voltage power supplies to reduce undesirable charge effects and improve fibre deposition control. We produced and characterised several 90° cross-hatched fibre scaffolds using a range of needle/collector plate voltages. Fibre thickness was found to be sensitive only to overall potential and invariant to specific tip/collector voltage. We also produced ordered scaffolds up to 200 layers thick (fibre spacing 1 mm, diameter 40 μm) and characterised structure in terms of three distinct zones; ordered, semi-ordered and disordered. Our in vitro analysis indicates successful cell attachment and distribution throughout the scaffolds, with little evidence of cell death after seven days. This study demonstrates the importance of electrostatic control for reducing destabilising polymer charge effects and enabling the fabrication of morphologically suitable scaffolds for tissue engineering.

Impact and interest:

5 citations in Scopus
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6 citations in Web of Science®

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ID Code: 81321
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: electrodeposition, cell growth, polymers, tissue engineering, infilitration
DOI: 10.1116/1.4914380
ISSN: 1559-4106
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Copyright Owner: Copyright 2015 American Vacuum Society
Deposited On: 15 Apr 2015 05:05
Last Modified: 19 Apr 2015 04:25

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