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Correlating rheology and printing performance of fiber-reinforced bioinks to assess predictive modelling for biofabrication

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005799
URN to cite this document: urn:nbn:de:bvb:703-epub-5799-2

Title data

Sonnleitner, David ; Schrüfer, Stefan ; Berglund, Linn ; Schubert, Dirk W. ; Lang, Gregor:
Correlating rheology and printing performance of fiber-reinforced bioinks to assess predictive modelling for biofabrication.
In: Journal of Materials Research. (July 2021) .
ISSN 2044-5326
DOI der Verlagsversion: https://doi.org/10.1557/s43578-021-00276-5

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Name: Sonnleitner2021_Article_CorrelatingRheologyAndPrinting.pdf
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Project information

Project title:
Project's official titleProject's id
SFB/TRR 225 "Biofabrication"A07

Project financing: Deutsche Forschungsgemeinschaft

Abstract

A crucial property for the evaluation of bioinks, besides biocompatibility, is printability, which is determined by resolution and shape fidelity. Recently, fiber reinforcement was used to overcome rheological limitations and introduce biomimetic structuring. This study provides a systematic approach to evaluate the printability of fiber reinforced hydrogels. Alginate and Pluronic hydrogels were blended with cellulose nanofibers (CeNF) and polycaprolactone (PCL) microfibers. SEM imaging revealed fiber-induced structural changes. Oscillatory rheological experiments showed that the addition of fiber fragments significantly altered the complex viscosity. A customized setup was utilized to determine strut spreading behavior in a real extrusion printing process. Strikingly, the data displayed excellent correlation with viscoelastic model-based predictions. CeNF increased the shape fidelity of both hydrogels, while PCL microfibers increased the viscosity but resulted in a time dependent loss of structural integrity in Pluronic. The results emphasize the need to complement shear-rheological analysis of bioinks by print-related customized analytical tools.

Further data

Item Type: Article in a journal
Keywords: 3D printing; Composite; Extrusion; Fiber; Modeling; Viscoelasticity
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University: Faculties > Faculty of Engineering Science > Junior Professor Biopolymer Processing > Junior Professor Biopolymer Processing - Juniorprof. Dr.-Ing. Gregor Lang
Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Junior Professor Biopolymer Processing
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5799-2
Date Deposited: 24 Sep 2021 09:23
Last Modified: 24 Sep 2021 09:23
URI: https://epub.uni-bayreuth.de/id/eprint/5799

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