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Selected Publication:

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. FullText FullText_BOKU

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.
Authors BOKU Wien:
Beaumont Marco
Plappert Sven
Potthast Antje
Rosenau Thomas
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Find related publications in this database (Keywords)
Nanocellulose
Lyocell
Inverse gas chromatography
Thermoporosimetry
Freeze-drying
Supercritical drying


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