BOKU - Universität für Bodenkultur Wien - Forschungsinformationssystem
Gewählte Publikation:
Beaumont, M; Kondor, A; Plappert, S; Mitterer, C; Opietnik, M; Potthast, A; Rosenau, T.
(2017):
Surface properties and porosity of highly porous, nanostructured cellulose II particles
CELLULOSE. 2017; 24(1): 435-440.
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- Abstract:
- Recently, a new member of the nanocellulose family was introduced, a cellulose II gel consisting of nanostructured and spherical particles. In this study, we compared two different drying techniques to obtain highly porous powders from this gel with preserved meso- and macroporous nanostructure: first, freeze-drying after solvent exchange to tBuOH and second, supercritical drying of the respective EtOH alcogel. The approaches yielded aerogel powders with surface areas of 298 and 423 m(2)/g, respectively. Both powders are amphiphilic and possess energetically heterogeneous surfaces with dominating dispersive term of the surface energy in the range of 50-52 mJ/m(2), as determined by a combination of physicochemical surface characterization techniques, such as iGC, BET and SEM. Despite the lower surface area, the cheaper and more widespread method, freeze-drying, yields a more polar and reactive cryogel.
- Autor/innen der BOKU Wien:
- Beaumont Marco
- Plappert Sven
- Potthast Antje
- Rosenau Thomas
- BOKU Gendermonitor:
- Find related publications in this database (Keywords)
- Nanocellulose
- Lyocell
- Inverse gas chromatography
- Thermoporosimetry
- Freeze-drying
- Supercritical drying
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