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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2013.tde-09072014-122808
Document
Author
Full name
Roberto Angelo de Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Seckler, Marcelo Martins (President)
Giulietti, Marco
Paiva, José Luís de
Title in Portuguese
Estudo sobre a conversão, formação e desenvolvimento de nanopartículas de prata pelo método de Turkevich modificado.
Keywords in Portuguese
Conversão
Mecanismo de crescimento
Nanopartícula de prata
Síntese
Abstract in Portuguese
Pretendeu-se, com este trabalho, estudar a síntese e o desenvolvimento de nanopartículas de prata, utilizando o método de Turkevich com algumas modificações. Dada a importância dessas nanopartículas no atual desenvolvimento científico, é de grande valia o melhor entendimento dos mecanismos que regem a síntese e desenvolvimento das nanopartículas de prata. Neste método, nitrato de prata sofre redução pelo citrato de sódio, numa mistura aquecida e bem agitada, para formar as nanopartículas. Amostras dessa mistura foram coletadas em vários intervalos de tempo, e reservadas para análises de concentração de prata por ICPAES, absorbância UV-Vis, imagens de MEV e distribuição de tamanhos por DLS. Com essas análises, foi possível estabelecer uma relação direta entre os valores de absorbância e os de conversão de prata. Também foi possível propor uma rota de desenvolvimento das nanopartículas, mostrando que, durante esse desenvolvimento, as partículas apresentam diferentes morfologias, tamanhos e tendência a formar aglomerados. Dependendo da aplicação das nanopartículas de prata, é possível interromper a reação quando elas apresentarem as características mais favoráveis.
Title in English
Study about conversion, formation and development of silver nanoparticles by a modified method of Turkevich.
Keywords in English
Conversion
Growth mechanism
Silver nanoparticle
Synthesis
Abstract in English
It was intended, with this work, to study the synthesis and development of silver nanoparticles using the Turkevich method with some modifications. Given the importance of these nanoparticles in the current scientific development, it is of great value the better understanding of the mechanisms governing the synthesis and growth of silver nanoparticles. In this method, silver nitrate is reduced by sodium citrate, in a well-stirred and heated mixture to form nanoparticles. Samples of this mixture were taken at various time intervals, and reserved for analysis of silver concentration by ICP-AES, UV-Vis absorbance, SEM images and size distribution by DLS. With these analyzes, it was possible to establish a direct relationship between the absorbance values and the conversion of silver. It was also possible to propose a synthesis and growth pathway of the silver nanoparticles, showing that during this development, the particles have different morphologies, sizes and tendencies to form agglomerates. Depending on the application of silver nanoparticles, it is possible to stop the reaction when they have the most favorable characteristics.
 
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Publishing Date
2014-07-17
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • Santos CA, et al. OPTIMIZATION OF A GREEN SYNTHESIS METHOD FOR SILVER NANOPARTICLES. In ISIC18 - International Symposium on Industrial Crystallization, Zurich, 2011. Proceedings of the 18th International Symposium on Industrial Crystallization., 2011.
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