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Title: Production of nanocellulose gels and films from invasive tree species
Authors: Almeida, R. O.
Ramos, A.
Alves, L. 
Potsi, E.
Ferreira, P. J. T. 
Carvalho, M. G. V. S. 
Rasteiro, M. G. 
Gamelas, J. A. F. 
Keywords: Cellulose nanofibrils; Circular economy; Films; Invasive species; Inverse gas chromatography; Waste valorisation
Issue Date: 6-Aug-2021
Publisher: Elsevier
Project: info:eu-repo/grantAgreement/MATIS/CENTRO-01-0145-FEDER-000014/PT 
info:eu-repo/grantAgreement/FCT/UIDB/00102/ 2020/PT 
Serial title, monograph or event: International Journal of Biological Macromolecules
Abstract: Wood/wastes from invasive tree species Acacia dealbata and Ailanthus altissima were used to produce high-value added nanocellulose. Firstly, bleached pulps were produced from the wood of these tree species after kraft cooking. Afterwards, the resultant pulps were pre-treated by TEMPO-mediated oxidation (Acacia dealbata) or enzymatic hydrolysis (Ailanthus altissima) followed by high-pressure homogenization. Hydrogels were obtained and characterized for their main physical and chemical properties, including rheology and evaluation of the surface properties of the freeze-dried materials by inverse gas chromatography. Results showed that micro/nanofibrils could be obtained from the wood of these invasive species. Rheometry studies showed that Acacia-TEMPO cellulose nanofibrils form strong gels with high yield stress point and viscosities (reaching ca. 100,000 Pa·s). Additionally, the surfaces of the obtained nanocelluloses showed a dispersive component of the surface energy near 40 mJ/m2 and a prevalence of the Lewis acidic character over the basic one, as typical for cellulose-based materials. Finally, films with good mechanical and optical properties could be obtained from the cellulose hydrogels. Acacia-TEMPO film (produced by filtration/hot pressing) showed a tensile strength of 79 MPa, Young's modulus of 7.9 GPa, and a transparency of 88%. The water vapor barrier, however, was modest (permeability of 4.9 × 10-6 g/(Pa·day·m)).
ISSN: 01418130
DOI: 10.1016/j.ijbiomac.2021.08.015
Rights: embargoedAccess
Appears in Collections:I&D CIEPQPF - Artigos em Revistas Internacionais

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