Highly flexible silica/chitosan hybrid scaffolds with oriented pores for tissue regeneration
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Published version
Author(s)
Type
Journal Article
Abstract
Inorganic/organic sol–gel hybrids have nanoscale co-networks of organic and inorganic components that give them the unique potential of tailored mechanical properties and controlled biodegradation in tissue engineering applications. Here, silica/chitosan hybrid scaffolds with oriented structures were fabricated through the sol–gel method with a unidirectional freeze casting process. 3-Glycidoxypropyl trimethoxysilane (GPTMS) was used to obtain covalent inorganic/organic coupling. Process variables were investigated such as cooling rate, GPTMS and inorganic content, which can be used to tailor the mechanical properties and hybrid chemical coupling. Structural characterization and dissolution tests confirmed the covalent cross-linking of the chitosan and the silica network in hybrids. The scaffolds had a directional lamellar structure along the freezing direction and a cellular morphology perpendicular to the freezing direction. Compression testing showed that the scaffolds with 60 wt% organic were flexible and elastomeric perpendicular to the freezing direction whilst behaving in an elastic-brittle fashion parallel to the freezing direction. The compressive strengths are about one order of magnitude higher in the latter direction reaching values of the order of 160 kPa. This behaviour provides potential for clinicians to be able to squeeze the materials to fit tissue defect sites while providing some mechanical support from the other direction.
Date Issued
2015-08-24
Date Acceptance
2015-08-21
Citation
Journal of Materials Chemistry B, 2015, 3 (38), pp.7560-7576
ISSN
2050-7518
Publisher
Royal Society of Chemistry
Start Page
7560
End Page
7576
Journal / Book Title
Journal of Materials Chemistry B
Volume
3
Issue
38
Copyright Statement
© The Royal Society of Chemistry 2015. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. http://creativecommons.org/licenses/by/3.0/
Publication Status
Published