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Materials 2018, 11(8), 1287; https://doi.org/10.3390/ma11081287

Polysaccharide-Based Aerogel Bead Production via Jet Cutting Method

1
Institute of Thermal Separation Processes, Hamburg University of Technology, 21073 Hamburg, Germany
2
Institute of Materials Research, German Aerospace Center, 51147 Cologne, Germany
3
Arcelik A.S., Central R&D Department, Istanbul 34950, Turkey
*
Author to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 23 July 2018 / Accepted: 23 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue Aerogels: Synthesis, Characterization and Application)
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Abstract

The aim of this work is to develop a method to produce spherical biopolymer-based aerogel particles, which is capable for scale-up in the future. Therefore, the jet cutting method is suggested. Amidated pectin, sodium alginate, and chitosan are used as a precursor (a 1–3 wt. % solution) for particle production via jet cutting. Gelation is realized via two methods: the internal setting method (using calcium carbonate particles as cross-linkers and citric and acidic acid for pH adjustment) and the diffusion method (in calcium chloride solutions). Gel particles are subjected to solvent exchange to ethanol and consequent supercritical drying with CO2. Spherical aerogel particles with narrow particle size distributions in the range of 400 to 1500 µm and a specific surface area of around 500 m2/g are produced. Overall, it can be concluded that the jet cutting method is suitable for aerogel particle production, although the shape of the particles is not perfectly spherical in all cases. However, parameter adjustment might lead to even better shaped particles in further work. Moreover, the biopolymer-based aerogel particles synthesized in this study are tested as humidity absorbers in drying units for home appliances, particularly for dishwashers. It has been shown that for several cycles of absorption and desorption of humidity, aerogel particles are stable with an absorption capacity of around 20 wt. %. View Full-Text
Keywords: aerogel; biopolymer; pectin; alginate; chitosan; beads; jet cutting aerogel; biopolymer; pectin; alginate; chitosan; beads; jet cutting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Preibisch, I.; Niemeyer, P.; Yusufoglu, Y.; Gurikov, P.; Milow, B.; Smirnova, I. Polysaccharide-Based Aerogel Bead Production via Jet Cutting Method. Materials 2018, 11, 1287.

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