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Synthesis of aqueous magnetic liquids by surface complexation of maghemite nanoparticles

✍ Scribed by N. Fauconnier; A. Bée; J. Roger; J.N. Pons

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
444 KB
Volume
83
Category
Article
ISSN
0167-7322

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✦ Synopsis

Adsorption of various ligands onto maghemite particles has been investigated in aqueous medium aiming at the production of magnetic liquids (ferrofluids) stable in a large rRn~e of pH. The formation of complexes with the structural iron of the surface oxide causes drastic changes in the stability of the colloid dispersion. The flocculation ranges have been established as a function of pH for maghemite particles in presence of ligands such as a-hydroxy or thiol polycarboxyHc acids and arginine hydroxamate. The stability behavior of the systems has been correlated with adsorption isotherms.

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