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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

[en] IMPREGNATION OF BAMBOO, DENDROCALAMUS GIGANTEUS, WITH DIFFERENT SILVER NANOPARTICLES TO PREVENT FUNGAL ATTACKS / [pt] IMPREGNAÇÃO DO BAMBU, DENDROCALAMUS GIGANTEUS, COM DIFERENTES NANOPARTÍCULAS DE PRATA PARA PREVENIR ATAQUES DE FUNGOS

RAQUEL DOS SANTOS MARTINS 22 June 2017 (has links)
[pt] O uso do bambu como reforço em matrizes poliméricas é uma ideia consolidada. No entanto, o bambu é suscetivel a ataques microbianos, onde consiste uma das principais limitações para seu uso. Este trabalho teve como principal objetivo a impregnação interna do bambu Dendrocalamus giganteus Wall.ex Munro com nanopartículas de prata (NPs-Ag), com potencial antifúngico, sintetizadas com dois estabilizantes diferentes (citrato trissódico e quitosana). As seções impregnadas foram analisadas verificando-se que os agregados de NPs-Ag-citrato se concentraram no parênquima, preferencialmente na parte externa do bambu, ocupando 0,26 por cento do volume total da amostra, com um volume médio de 9,19 × 10 elevado a 3 micrómetros cúbicos. Enquanto que os agregados de NPs-Ag-quitosana se concentraram tanto parênquima quanto nos vasos do metaxilema, apresentando maior homogeneidade de distribuição na parte interna do bambu, ocupando 1,18 por cento do volume total da amostra e volume médio de 1,71 × 10 elevado a 3 micrômetros cúbicos. / [en] The use of bamboo as reinforcement in polymer matrices is an established idea. However, bamboo is susceptible to microbial spoilage, which is a major limitation for their use. This work had as main objective the internal impregnation of bamboo Dendrocalamus giganteus Munro Wall.ex with silver nanoparticles (NPs-Ag) with antifungal potential, synthesized with two different stabilizers (trisodium citrate and chitosan). The impregnated sections were analyzed verifying that Ag NPs citrate aggregates concentrated in the parenchyma, preferably on the outside of the bamboo, occupying 0.26 percent of the total sample volume with an average volume of 9.19 × 10 to 3 cubic micrometer. While NPs-Ag-chitosan aggregates focused both parenchymal and in metaxylem vessels, with more homogeneous distribution inside the bamboo, occupying 1.18 percent of the total sample volume and average volume of 1.71 × 10 to 3 cubic micrometer.

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