A regioselective coating onto microarray channels of bamboo with chitosan-based silver nanoparticles
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In this investigation, bamboo (Dendrocalamus giganteus Munro) timbers were coated selectively into vascular vessel bundles with a potential antimicrobial colloidal solution of silver nanoparticles (Ag-NPs). Electric charge and size of Ag-NPs, with different charged organic ligands (trisodium citrate and chitosan), affect their self-sorting in different anatomical structures of bamboo when submitted up to 20 impregnation cycles through a vacuum system. Physicochemical characterization of Ag-NPs was performed by spectroscopic techniques and electron microscopy. Confocal laser scanning microscopy and scanning electron microscopy were employed to characterize natural bamboo. Qualitative and quantitative determination of the metal coating in bamboo specimens was performed with X-ray microtomography (μCT), energy-dispersive X-ray spectroscopy, and X-ray diffraction. μCT revealed a gradient deposition of citrate-capped Ag-NPs into the parenchyma tissue with the higher concentration at the outer part of the bamboo. On the other hand, the chitosan-capped Ag-NPs were deposited mainly in the vessel bundles.
KeywordsBamboo Silver nanofiller Nanocoating Bionanocomposite Regioselective coating Hybrid bio-based composite
This work was supported by Conselho Nacional de Desenvolvimento Científico e Tecnologico-Brasil (CNPq) (Grant Number 458302/2013-9) and the Serrapilheira Institute (Grant Number Serra-1709-17482) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. O.P. thank FAPERJ-Brazil for the JCNE fellowship (E-26/203.281/2016). PhD student R. S. M, Post-Doc E.J.R.R. are grateful to CNPq for scholar fellowships. We thank Dr. Julio C. Spadotto and Prof. Guillermo Solorzano for the HR-TEM images and Centro Brasileiro de Pesquisa Fisica (CBPF) for the use of their facilities.
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