PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 2, Number 2, 2016
NANOCELLULOSE Rheological properties of nanocrystalline cellulose suspensions, Yang Chen, Chunjiang Xu, Jing Huang, Defeng Wu, Qiaolian Lv, Carbohydrate Polymers , Vol.157. Rheological behaviour, including linear and nonlinear as well as transient rheology, of nanocrystalline cellulose (NCC) suspensions was studied in this work. Two kinds of polymer solutions, aqueous poly(vinyl alcohol) (PVA) with flexible chain structure and aqueous carboxymethyl cellulose (CMC) with semi-rigid chain structure, were used as the suspension media to further explore the role that the interactions among NCC and polymers play during shear flow. Sustainable commercial nanocrystalline cellulose manufacturing process with acid recycling, Saurabh Jyoti Sarma, Mariem Ayadi, Satinder Kaur Brar, Richard Berry, Carbohydrate Polymers , Vol.156. Nanocrystalline cellulose is produced industrially by concentrated acid hydrolysis of cellulosic materials. In this process, the sulphuric acid rich liquor can be concentrated and reused; however, removal of sugar monomers and oligomers is necessary for such recycling. Membrane and ion exchange technology can be employed to remove sugars; as a part of the present study, activated carbon was evaluated. Based on this finding, a sustainable method has been proposed for commercial nanocrystalline cellulose manufacturing. NOVEL PRODUCTS Facilitated fabrication of high strength silica aerogels using cellulose nanofibrils as scaffold, Jingjing Fu, Siqun Wang, Chunxia He, Zexiang Lu, Jingda Huang, Zhilin Chen, Carbohydrate Polymers , Vol.147. Monolithic cellulose nanofibrils (CNF)-silica composite aerogels were successfully prepared by immersing CNF aerogels into a silica solution in a two-step sol-gel process (initial hydrolysis of tetraethyl orthosilicate (TEOS) followed by condensation of silica particles). The compression properties of the composite aerogel improved greatly compared with those of the silica aerogel. Moreover, the compressive strength of the composite aerogel prepared in this work greatly exceeded the conventional insulation materials found in the recent commercial market, and without substantial increases in thermal conductivity. Hence, the findings of this research offer a promising application for composite aerogels and give a theoretical basis for developing new advanced materials. Strong and electrically conductive nanopaper from cellulose nanofibers and polypyrrole, Makara Lay, J. Alberto Méndez, Marc Delgado-Aguilar, Kim Ngun Bun, Fabiola Vilaseca, Carbohydrate Polymers , Vol.152. In this work, we prepare cellulose nanopapers of high mechanical performance and with the electrical conductivity of a semiconductor. Cellulose nanofibres from bleached softwood pulp were coated with polypyrrole via in situ chemical polymerisation, in presence of iron chloride (III) as oxidant agent. The structure and morphology of nanopapers were studied, as well as their thermal, mechanical and conductive properties. Spray freeze-dried nanofibrillated cellulose aerogels with thermal superinsulating properties, Clara Jiménez-Saelices, Bastien Seantier, Bernard Cathala, Yves Grohens, Carbohydrate Polymers , Vol.157. Nanofibrillated cellulose (NFC) aerogels were prepared by spray freeze-drying. Their structural, mechanical and thermal insulation properties were compared to those of NFC aerogels prepared by conventional freeze- drying. The purpose of this investigation is to develop superinsulating bioaerogels by reducing their pore size.
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Technical Abstracts
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