Evidence of phase separation in magnetic colloids using magnetic resonance

In this work, we report a systematic comparison between three-dimensional Monte Carlo simulations and magnetic resonance measurements of polydisperse Fe3O4 based nanoparticles. Magnetization curves clearly show the validity of the simple model employed by us. Our theoretical results are then compared to real ferrofluids samples that have been experimentally characterized by transmission electron microscopy and magnetic resonance measurements. Our data indicates that the number of surfactant molecules and its physical distribution (grafting) decisively affects the surface-surface particle distance within an agglomerate. Two different grafting regimes are clearly identified from our theoretical data.

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Role of surfactant molecules in magnetic fluid: Comparison of Monte Carlo simulation and electron magnetic resonance

et al. 2008

Phys. Rev. E

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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 der Waals 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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Evidence of phase separation in magnetic colloids using magnetic resonance

Cited by 4 publications

References 21 publications

Field-induced flocculation on biocompatible magnetic colloids

Field-induced flocculation on biocompatible magnetic colloids

Concentration effects on the grafting of magnetic nanoparticles by Monte Carlo simulations

Role of surfactant molecules in magnetic fluid: Comparison of Monte Carlo simulation and electron magnetic resonance

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