Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/15251
Tipo do documento: Artigo
Título: Role of surfactant molecules in magnetic fluid: comparison of monte carlo simulation and electron magnetic resonance
Autor: Castro, Leonardo Luiz e
Gonçalves, Gil Renato Ribeiro
Skeff Neto, Kalil
Morais, Paulo César de
Bakuziz, Andris Figueiroa
Miotto, Ronei
Abstract: We investigate a magnetic fluid composed of magnetite nanoparticles surfacted with dodecanoic acid molecules and stably dispersed in a hydrocarbon solvent. A comparison between Monte Carlo simulation and different experimental techniques allows us to validate our methodology and investigate the behavior of the surfactant molecules. Our analysis, based on the Langmuir model, suggests that the surfactant grafting number on isolate nanoparticles increases with the nanoparticle concentration, while the grafting on agglomerated nanoparticles presents a more complicated behavior. Our results suggests that, if properly coated and at a certain concentration range, colloids can become stable even in the presence of agglomerates. The role of the Hamaker constant, which controls the van derWaals interaction intensity, was also investigated.We have found that the ratio between grafting and Hamaker constant governs the level of nanoparticle agglomeration.
País: Estados unidos
Unidade acadêmica: Instituto de Física - IF (RG)
Citação: CASTRO, L. L.; GONÇALVES, G. R. R.; SKEFF NETO, K.; MORAIS, P. C.; BAKUZIS, A. F.; MIOTTO, R. Role of surfactant molecules in magnetic fluid: comparison of monte carlo simulation and electron magnetic resonance. Physical Review. E, Melville, v. 78, n. 6, e061507, 2008.
Tipo de acesso: Acesso Aberto
Identificador do documento: 10.1103/PhysRevE.78.061507
Identificador do documento: 10.1103/PhysRevE.78.061507
URI: http://repositorio.bc.ufg.br/handle/ri/15251
Data de publicação: 2008
Aparece nas coleções:IF - Artigos publicados em periódicos

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