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Titel
Surface properties and porosity of highly porous, nanostructured cellulose II particles
VerfasserBeaumont, Marco ; Kondor, Anett ; Plappert, Sven ; Mitterer, Claudia ; Opietnik, Martina ; Potthast, Antje ; Rosenau, Thomas
Erschienen in
Cellulose, Berlin, 2017, Jg. 24, H. 1, S. 435-440
ErschienenSpringer, 2017
SpracheEnglisch
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (EN)Nanocellulose / Lyocell / Inverse gas chromatography / Thermoporosimetry / Freeze-drying / Supercritical drying
ISSN1572-882X
URNurn:nbn:at:at-ubbw:3-1912 Persistent Identifier (URN)
DOI10.1007/s10570-016-1091-y 
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Surface properties and porosity of highly porous, nanostructured cellulose II particles [0.98 mb]
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Zusammenfassung (Englisch)

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 m2/g, respectively. Both powders are amphiphilic and possess energetically heterogeneous surfaces with dominating dispersive term of the surface energy in the range of 5052 mJ/m2, 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.

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