Cellulose aerogel particles: control of particle and textural properties in jet cutting process

Reported approach aims for the synthesis of spherical cellulose beads with high production rates (0.7–4.1 kg/h of hydrogel) via the so-called jet cutting method. To form particles, jets of aqueous cellulose/sodium hydroxide solutions were cut into pieces and collected in a gelation bath (30 wt% aque...

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Bibliographic Details
Published in:Cellulose (London) 2021, Vol.28 (1), p.223-239
Main Authors: Schroeter, Baldur, Yonkova, Velislava P., Niemeyer, Noreen A. M., Jung, Isabella, Preibisch, Imke, Gurikov, Pavel, Smirnova, Irina
Format: Article
Language:English
Subjects:
Aerogels
Beads
Bioorganic Chemistry
Bulk density
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Cutting parameters
Ethanol
Glass
Hydrogels
Jet cutting
Natural Materials
Nozzles
Organic Chemistry
Original Research
Physical Chemistry
Polymer Sciences
Process parameters
Shape
Sodium hydroxide
Sulfuric acid
Sustainable Development
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Summary:Reported approach aims for the synthesis of spherical cellulose beads with high production rates (0.7–4.1 kg/h of hydrogel) via the so-called jet cutting method. To form particles, jets of aqueous cellulose/sodium hydroxide solutions were cut into pieces and collected in a gelation bath (30 wt% aqueous H 2 SO 4 , 20 °C). After solvent exchange with ethanol and subsequent supercritical drying, cellulose aerogel particles were obtained. The particles showed high specific surface areas (ca. 400 m 2 /g) and low bulk (untapped) densities (0.06–0.10 g/cm 3 ). Variation of cellulose content (4–7 wt%) and jet cutting process parameters (cutting frequency, nozzle diameter, jet velocity) turned to be useful parameters for controlling the particles size and shape. Highly spherical particles with sphericity SPH  ≥ 0.92 were obtained in a broad range of achievable particle sizes (0.4–1.0 mm), with an optimum of SPH at 6 wt% cellulose content.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-020-03555-2