Synchrotron microtomography reveals the fine three-dimensional porosity of composite polysaccharide aerogels

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Ghafar , A , Parikka , K , Haberthür , D , Tenkanen , M , Mikkonen , K S & Suuronen , J-P 2017 , ' Synchrotron microtomography reveals the fine three-dimensional porosity of composite polysaccharide aerogels ' , Materials , vol. 10 , no. 8 , pp. 871 . https://doi.org/10.3390/ma10080871

Title: Synchrotron microtomography reveals the fine three-dimensional porosity of composite polysaccharide aerogels
Author: Ghafar, Abdul; Parikka, Kirsti; Haberthür, David; Tenkanen, Maija; Mikkonen, Kirsi S.; Suuronen, Jussi-Petteri
Contributor: University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Food and Nutrition
Date: 2017
Language: eng
Number of pages: 20
Belongs to series: Materials
ISSN: 1996-1944
URI: http://hdl.handle.net/10138/230146
Abstract: 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.
Subject: 116 Chemical sciences
Polysaccharide
nanofibrillated cellulose
216 Materials engineering
ice-templating
114 Physical sciences
synchrotron microtomography
image analysis
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