Role of surfactant molecules in magnetic fluid: comparison of monte carlo simulation and electron magnetic resonance
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2008
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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.
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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.