DETERMINATION OF THE PARTICLE CONCENTRATION IN DILUTED MAGNETIC FLUIDS USING FT-IR SPECTROMETRY
Pages 120-124
I. Malaescu, C. N. Marin, A. Lucaci, E. Preda and I. Nicoara
Abstract
In the present article we have carried out FT-IR measurements and static magnetization curve measurements on a dilution serie of a magnetic fluid. FT-IR measurements revealed that the peak corresponding to the wavenumber of 637.5 cm-1 depends on the particle concentration within the investigated magnetic fluid sample. The dependence on the particle concentration of the absorbance of the magnetic fluid, corresponding to the wavenumber of 637.5 cm-1 obeys the Beer-Lambert law in the range of low particle concentrations. Based on this linear dependence, we have determined the particle concentration of other arbitrary diluted samples of the same initial magnetic fluid. We have found out a good agreement between the values of particle concentration obtained by means of Beer-Lambert law and those obtained from the static magnetization curve.
The experimental results alow us to assert that the FT-IR measurements and the Beer-Lambert law can be used in determination of particle concentration within magnetic fluids in the range of low particle concentrations.