Comparative analysis of the structure of sterically stabilized ferrofluids on polar carriers by small-angle neutron scattering

M. V. Avdeev, V. Aksenov, M. Balasoiu, V. M. Garamus, A. Schreyer, G. Török, L. Rosta, D. Bica, L. Vékás

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Results of experiments on small-angle neutron scattering from ferrofluids on polar carriers (pentanol, water, methyl-ethyl-ketone), with double-layer sterical stabilization of magnetic nanoparticles, are reported. Several types of spatial structural organization are observed. The structure of highly stable pentanol-based samples is similar to that of stable ferrofluids based on organic non-polar carriers (e.g., benzene) with mono-layer covered magnetic nanoparticles. At the same time, the effect of the interparticle interaction on the scattering is stronger in polar ferrofluids because of the structural difference in the surfactant shell. The structure of the studied methyl-ethyl-ketone- and water-based ferrofluids essentially different from the previous case. The formation of large (>100 nm in size) elongated or fractal aggregates, respectively, is detected even in the absence of external magnetic field, which corresponds to weaker stability of these types of ferrofluids. The structure of the fractal aggregates in water-based ferrofluids does not depend on the particle concentration, but it is sensitive to temperature. A temperature increase results in a decrease in their fractal dimension reflecting destruction of the aggregates. In addition, in water-based ferrofluids these aggregates consist of small (radius ∼10 nm) and temperature-stable primary aggregates.

Original languageEnglish
Pages (from-to)100-107
Number of pages8
JournalJournal of Colloid and Interface Science
Volume295
Issue number1
DOIs
Publication statusPublished - Mar 1 2006

Fingerprint

Magnetic fluids
ferrofluids
Neutron scattering
neutron scattering
Pentanols
fractals
Water
Ketones
ketones
Fractals
water
Nanoparticles
nanoparticles
Fractal dimension
Benzene
Surface-Active Agents
Temperature
destruction
temperature
Surface active agents

Keywords

  • Aggregation
  • Ferrofluids
  • Magnetic fluids
  • Small-angle neutron scattering
  • Sterical stabilization

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry
  • Surfaces and Interfaces

Cite this

Comparative analysis of the structure of sterically stabilized ferrofluids on polar carriers by small-angle neutron scattering. / Avdeev, M. V.; Aksenov, V.; Balasoiu, M.; Garamus, V. M.; Schreyer, A.; Török, G.; Rosta, L.; Bica, D.; Vékás, L.

In: Journal of Colloid and Interface Science, Vol. 295, No. 1, 01.03.2006, p. 100-107.

Research output: Contribution to journalArticle

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