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NanopartÃculas sustentáveis para aplicações emergentes
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ISBN10: 6209957005
ISBN13: 9786209957000
Publisher: Edicoes Nosso Conhecimento
Published: Apr 20 2026
Pages: 60
Weight: 0.21
Height: 0.14 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209957000
Publisher: Edicoes Nosso Conhecimento
Published: Apr 20 2026
Pages: 60
Weight: 0.21
Height: 0.14 Width: 6.00 Depth: 9.00
Language: Portuguese
Este livro explora a sÃntese verde e amiga do ambiente de nanopartÃculas de prata utilizando um extrato de planta, que contém ácido ascórbico, que actua como agente redutor e de cobertura. Ao adicionar este extrato a soluções de nitrato de prata, o investigador observou uma mudança de cor distinta para vermelho-vinho após a incubação, sinalizando a formação de nanopartÃculas através da ressonância plasmónica de superfÃcie. A caraterização exaustiva utilizando espetroscopia UV-Vis, dispersão dinâmica da luz (DLS) e microscopia eletrónica de transmissão (TEM) confirmou a produção de partÃculas de prata nano-cristalinas esféricas com o tamanho e a forma desejados. A validação estrutural e elementar foi ainda fornecida pela difração de raios X (XRD), que identificou as facetas padrão da prata, e pela espetroscopia de raios X por dispersão de energia (EDX), que verificou a composição elementar. Finalmente, os testes antibacterianos utilizando o método de difusão em disco demonstraram que estas nanopartÃculas sintetizadas biologicamente inibem eficazmente o crescimento de bactérias Gram-positivas e Gram-negativas, sugerindo um potencial significativo para futuras aplicações em medicina, têxteis e eletrónica avançada.
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