Surfactant double layer stabilized magnetic nanofluids for biomedical application

E. Tombácz, D. Bica, A. Hajdú, E. Illés, A. Majzik, L. Vékás

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Magnetite nanoparticles were coated with surfactant double layers in order to prepare water based magnetic fluids (MFs). The effects of head group (sulfonate, carboxylate) and alkyl chain length (11-17C atoms) and the combination of surfactants were studied. Adsorption, dynamic light scattering (DLS) and electrophoretic mobility measurements were performed. The quantity of surfactant varied between 0.3 and 0.5g, i.e.their specific amount ranges over 1.5-2mmolg-1 magnetite in MFs. The adsorption isotherm of Naoleate on magnetite proved the double layer formation with 2mmolg-1 saturation value in good harmony with the empirical doses. The effect of diluting MFs, pH and salt concentration was studied. The pH-dependent stability and the salt tolerance of MFs were different owing to the dissociation of the outermost hydrophilic groups and the hydrophobic interactions scaling with the alkyl chain length of surfactant. The hydrophobic interactions are favored only for oleic and myristic acid double layers. In these MFs, aggregation cannot be observed even in fairly dilute systems up to the physiological salt concentration around neutral pH 6-8 favored in biomedical application. The stable oleic and myristic acid double layers can hinder effectively the aggregation of magnetite particles due to the combined steric and electrostatic stabilization.

Original languageEnglish
Article number204103
JournalJournal of Physics Condensed Matter
Volume20
Issue number20
DOIs
Publication statusPublished - May 21 2008

Fingerprint

Magnetic fluids
Surface-Active Agents
Ferrosoferric Oxide
Surface active agents
magnetite
surfactants
Magnetite
fluids
oleic acid
Salts
Myristic Acid
Oleic Acid
salts
Chain length
Magnetite Nanoparticles
Agglomeration
Magnetite nanoparticles
Electrophoretic mobility
acids
adsorption

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Surfactant double layer stabilized magnetic nanofluids for biomedical application. / Tombácz, E.; Bica, D.; Hajdú, A.; Illés, E.; Majzik, A.; Vékás, L.

In: Journal of Physics Condensed Matter, Vol. 20, No. 20, 204103, 21.05.2008.

Research output: Contribution to journalArticle

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