Bionanocomposite Bamboo: A Regioselective Impregnation with Silver Nanofillers for Antifungal Application
O. Pandoli, R.S. Martins, B.A. Barbosa, K.L.G. De Toni, S. Paciornik, Marcos H.P. Maurício, R.M.C. Lima, N.B. Padilha, S. Letichevsky, R.R. Avillez, K. Ghavami
Abstract. Silver nanoparticles are promising nanofiller materials (Ag-NFs) for reinforcement and anti-bacterial effect in polymers and composites. In this investigation bamboo samples, Dendrocalamus giganteus Munro, were impregnated using a colloidal solution of homemade Ag-NFs with the objective of fill up the vascular bundles vessels and improving its resistance to the attacks by fungi. The metal nanostructured materials with different charged organic ligands (trisodium citrate and chitosan) were used to fill up the internal microenvironment of bamboo. The final purpose to create a hybrid metal-biocomposite was driven by the electric charge and size-diameter of Ag-NFs self-sorting different anatomical structures of bamboo. Chemical and physical characterization was made by DLS, UV-VIS, zeta-potential and STEM. The bamboo specimens (5x12x18mm) were submitted to 20 impregnation cycles through a vacuum system. A qualitative and quantitative characterization of the metal aggregate depositions of impregnated bamboo specimens were analyzed with X-ray microtomography (μCT) and DRX. The μCT revels a gradient deposition of citrate-capped Ag-NFs into the parenchyma tissue with higher concentration at the outer part for bamboo. While, the chitosan-capped Ag-NFs were deposited manly in the vessel bundles. Both engineered biocomposite materials and untreated specimens were exposed to air and humidity. After 14 months the treated samples were free of fungal colonies, while colonization by the fungal hyphae were present on untreated bamboo specimens.
Keywords
Bamboo, Silver Nanofiller, Nanocomposite, Coating, Antifungical Activity
Published online , 13 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: O. Pandoli, R.S. Martins, B.A. Barbosa, K.L.G. De Toni, S. Paciornik, Marcos H.P. Maurício, R.M.C. Lima, N.B. Padilha, S. Letichevsky, R.R. Avillez, K. Ghavami, ‘Bionanocomposite Bamboo: A Regioselective Impregnation with Silver Nanofillers for Antifungal Application’, Materials Research Proceedings, Vol. 7, pp 415-427, 2018
DOI: https://dx.doi.org/10.21741/9781945291838-39
The article was published as article 39 of the book Non-Conventional Materials and Technologies
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