Production of nanocellulose gels and films from invasive tree species
| Autor: | Ana Ramos, Luis Francisco Angeli Alves, Maria G. Rasteiro, Paulo Ferreira, E. Potsi, José A. F. Gamelas, M. G. V. S. Carvalho, R.O. Almeida |
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| Rok vydání: | 2021 |
| Předmět: |
Chromatography
Gas Materials science Circular economy Acacia dealbata Surface Properties Waste valorisation Biochemistry Trees Nanocellulose Cyclic N-Oxides chemistry.chemical_compound X-Ray Diffraction Structural Biology Spectroscopy Fourier Transform Infrared Ultimate tensile strength Inverse gas chromatography Cellulose Molecular Biology Films Ailanthus Invasive species Rheometry biology Acacia General Medicine biology.organism_classification Wood Nanostructures chemistry Chemical engineering Self-healing hydrogels Cellulose nanofibrils Introduced Species Gels Kraft paper |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2021.08.015 |
| Popis: | Wood from invasive tree species Acacia dealbata and Ailanthus altissima was 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 measurements. After freeze-drying, the surface properties of the materials were evaluated by inverse gas chromatography. Results showed that nano/micro fibrils 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)). |
| Databáze: | OpenAIRE |
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