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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)). | URI: | https://hdl.handle.net/10316/95604 | 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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