Effect of Surfactant Excess in Non-Polar Ferrofluids Probed by Small-Angle Neutron Scattering

Abstract:

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The microstructure of ferrofluids (magnetite/oleic acid/benzene) with an excess of free oleic acid is investigated by small-angle neutron scattering (SANS). For such excess higher than 25 vol. % a sharp break in the stability of ferrofluids occurs followed by coagulation and precipitation. Below this value the influence of the surfactant excess on the stability of ferrofluids is insignificant; neither particle aggregation nor surfactant agglomeration is observed. The interaction of free acid molecules in the ferrofluids is compared with that in pure benzene solutions. A significant increase in the attraction is observed for acid molecules in the ferrofluids, which is related to the loss of magnetic fluids stability at high excess of acid.

Info:

Periodical:

Solid State Phenomena (Volumes 152-153)

Edited by:

N. Perov

Pages:

198-201

DOI:

10.4028/www.scientific.net/SSP.152-153.198

Citation:

V.I. Petrenko et al., "Effect of Surfactant Excess in Non-Polar Ferrofluids Probed by Small-Angle Neutron Scattering", Solid State Phenomena, Vols. 152-153, pp. 198-201, 2009

Online since:

April 2009

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Price:

$35.00

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