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On low concentration aqueous magnetic fluid light scattering properties

D. CHICEA1,* , M. RĂCUCIU1

Affiliation

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

Abstract

Nanostructured Fe3O4 particles were prepared by co-precipitation of acidic solutions of Fe (II) and Fe (III). The aggregation of the particles was prevented by using a 25% solution of tetramethylammonium hydroxide as surfactant. The TEM analysis revealed an average size of the ferrofluid particles of 7.7 nm. An experiment consisting of a He-Ne laser source, a cuvette, a frame grabber and a computer was set up investigate the light scattering properties of aqueous magnetic fluid in the very small concentration range. Digital movies of the far field interference having magnetic fluid at different concentrations as target were recorded and analyzed using a computer code written for this purpose. For each movie the averages of the intensity, contrast and speckle size were calculated. The variation of these parameters with the magnetic fluid concentration was found and plotted. We found that the average intensity, contrast and speckle size have a smooth and slow variation with the magnetic fluid concentration except for a specific region where the variation is stronger. The procedure can be used further on to measure the volume ratio in the 0 – 500 ppm concentration range, which otherwise is difficult to be measured using other techniques..

Keywords

Magnetic fluid, Light scattering, Speckle analysis, Very low concentration measurement.

Submitted at: Nov. 11, 2007
Accepted at: Dec. 7, 2007

Citation

D. CHICEA, M. RĂCUCIU, On low concentration aqueous magnetic fluid light scattering properties, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 12, pp. 3843-3846 (2007)