Surface properties and porosity of highly porous, nanostructured cellulose II particles

• DOI: 10.1007/s10570-016-1091-y
• Publication Date: 2016-10-15T02:23:54Z
• Authors: Marco Beaumont; Anett Kondor; Sven Plappert; Claudia Mitterer; Martina Opietnik; Antje Potthast; Thomas Rosenau
• Keywords: Supercritical drying; Inverse gas chromatography; Polymers and Plastics; 02 engineering and technology; Lyocell; 104019 Polymerwissenschaften; NANOFIBRILS; ENERGY; 104011 Materialchemie; NANOCRYSTALS; 104011 Materials chemistry; Freeze-drying; DRYING METHOD; INVERSE GAS-CHROMATOGRAPHY; Thermoporosimetry; AEROGELS; 0210 nano-technology; 104019 Polymer sciences; FIBERS; Nanocellulose

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 50–52 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.