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Studies on static and dynamic light scattering properties of water based magnetic fluid

D. CHICEA1,* , M. RĂCUCIU1

Affiliation

  1. “Lucian Blaga” University, Faculty of Science, Dr. I. Ratiu Street, No.5-7, 550024, Sibiu, Romania

Abstract

Magnetic fluids (ferrofluids) are dispersions of small, single-domain magnetic particles suspended in a fluid carrier. In this work magnetite nanoparticles coated with different surfactants (tetramethylammonium hydroxide, perchloric acid and citric acid) and dispersed in water were used as light scattering targets. The water based magnetic fluid samples were prepared by a co-precipitation method. A simple experimental setup was assembled to analyze the magnetic fluid static and dynamic light scattering properties. The setup consists of a He-Ne laser, a cuvette, a sensitive detector, a data acquisition system and a computer. Light scattering intensity at small angles was measured and the anisotropy parameter g was determined by the mean square method using a code that was written for this purpose. The variation of the light scattering anisotropy parameter g with the nanoparticles type is discussed. The far interference field presented the typical “boiling speckles” aspect caused by the complex motion of the scattering centers. The average intensity and contrast were calculated for each movie in order to compensate the fluctuations. The variation of these parameters with the magnetic fluid concentration was found and plotted. Time series were recorded for different nanoparticles types, the autocorrelation time was calculated for each sample and the variation of the autocorrelation time with the particle type is discussed..

Keywords

Ferrofluids, Light scattering, Nanoparticles.

Submitted at: Sept. 27, 2008
Accepted at: Dec. 10, 2008

Citation

D. CHICEA, M. RĂCUCIU, Studies on static and dynamic light scattering properties of water based magnetic fluid, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 12, pp. 3317-3321 (2008)