DETERMINAÇÃO DE RESÍDUOS DE CATALISADORES EM NANOTUBOS DE CARBONO

• Ano de defesa: 2008
• Autor(a) principal: Cocco, Carmem Regina
• Orientador(a): Mortari, Sergio Roberto
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Franciscana
• Programa de Pós-Graduação: Mestrado Acadêmico em Nanociências
• Departamento: Biociências e Nanomateriais
• País: BR
• Palavras-chave em Português: Nanotubos de carbono; Metais; MIC; ICP OES
• Palavras-chave em Inglês: Carbon nanotubes; Metals; MIC; ICP OES
• Área do conhecimento CNPq: CNPQ::ENGENHARIAS
• Link de acesso: http://tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/236; http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/330

Carbon nanotubes have several technological applications, due to their electrical characteristics and high mechanical resistance. After the synthesis, in the stage of purification, impurities such as residues of metal catalysts can change the characteristics of the material. Carbon nanotubes (CNT) are materials of difficult decomposition, in which, even though using acids in systems in high temperature and pressure, we don t get good results in relation to the total destruction of the sample, creating a compromising in the next stage, the determination of the metals. In this work, we used the method of microwave induced combustion (MIC) for the decomposition of CNT and determination of metals (Fe, Ni, Co, Ca and La) by inductively coupled plasma optical emission spectrometry (ICP OES). The product of the combustion was absorbed in adequate solutions (water, HNO3 and HCl) and taken to the determination of the metals. Better results were gotten when the concentrated HCl was used as an absorbing solution. For the carbon nanotubes analyzed, even though purified, high concentrations of metal catalysts (from 0.01 to 2.7%) were found.