Ghafar, Abdul; Parikka, Kirsti; Haberthür, David; Tenkanen, Maija; Mikkonen, Kirsi S; Suuronen, Jussi-Petteri (2017). Synchrotron Microtomography Reveals the Fine Three-Dimensional Porosity of Composite Polysaccharide Aerogels. Materials, 10(8) Molecular Diversity Preservation International MDPI 10.3390/ma10080871
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This study investigates the impact of ice-templating conditions on the morphological features of composite polysaccharide aerogels in relation to their mechanical behavior and aims to get a better insight into the parameters governing these properties. We have prepared polysaccharide aerogels of guar galactomannan (GM) and tamarind seed xyloglucan (XG) by enzymatic oxidation with galactose oxidase (GaO) to form hydrogels, followed by conventional and unidirectional ice-templating (freezing) methods and lyophilization to form aerogels. Composite polysaccharide aerogels were prepared by incorporating nanofibrillated cellulose (NFC) into polysaccharide solutions prior to enzymatic oxidation and gel formation; such a cross linking technique enabled the homogeneous distribution of the NFC reinforcement into the gel matrix. We conducted phase-enhanced synchrotron X-ray microtomography (XMT) scans and visualized the internal microstructure of the aerogels in three-dimensional (3D) space. Volume-weighted pore-size and pore-wall thickness distributions were quantitatively measured and correlated to the aerogels' mechanical properties regarding ice-templating conditions. Pore-size distribution and orientation depended on the ice-templating methods and the NFC reinforcement that significantly determined the mechanical and shape-recovery behavior of the aerogels. The results obtained will guide the design of the microporous structure of polysaccharide aerogels with optimal morphology and mechanical behavior for life-sciences applications.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy 04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy > Topographical and Clinical Anatomy |
UniBE Contributor: |
Haberthür, David |
ISSN: |
1996-1944 |
Publisher: |
Molecular Diversity Preservation International MDPI |
Language: |
English |
Submitter: |
David Christian Haberthür |
Date Deposited: |
28 Jan 2021 12:10 |
Last Modified: |
05 Dec 2022 15:42 |
Publisher DOI: |
10.3390/ma10080871 |
PubMed ID: |
28773235 |
Uncontrolled Keywords: |
ice-templating image analysis nanofibrillated cellulose polysaccharide synchrotron microtomography |
BORIS DOI: |
10.48350/149262 |
URI: |
https://boris.unibe.ch/id/eprint/149262 |
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