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Comparative study on magnetic nanoparticles colloids stability

M. RĂCUCIU1,* , D. CREANGĂ2, P. TUPU2, E. BÎRSAN1

Affiliation

  1. “Lucian Blaga” University, Faculty of Science, Dr. I. Ratiu Street, No.5-7, 550024, Sibiu, Romania
  2. “Al. I. Cuza” University, Faculty of Physics, 11A Blvd. Copou, Iasi, Romania

Abstract

Advanced soft magnetic materials in the form of stable concentrated suspensions of magnetic nanoparticles in either organic or inorganic solvents are called magnetic fluids or ferrofluids. The complex structure of the magnetic colloids involves the assurance of their stability as required by both technical and biomedical applications. In order to prevent ferrophase particles agglomerations, good quality coating of small size particles need to be carried out. Small size ferrophase is essential not only for the homogeneity of the magnetic colloid but also for the efficient penetration of biological structures. In this respect, we carried out a comparative study regarding one magnetic fluid prepared in our laboratories (one based on petroleum) as well as other similar products presented in the literature reports. The ferrophase of our magnetic fluid was prepared by chemical co-precipitation. In all cases, the physical diameter of the ferrophase nanoparticles was measured using transmission electron microscopy (TEM) data. The average values were first considered but the whole distribution histogram was also analyzed. The dimensional distribution of the ferrophase physical diameter was comparatively presented using the box-plot statistical method. The percentage of relatively small particles (under 5 nm) was compared with the percentage of relatively large particles (over 10 nm). The presence of exceptionally large aggregates was also discussed in order to assess the quality of the magnetic colloids prepared by us in comparison with the products from several other countries..

Keywords

Ferrofluids, Box-plot analysis, TEM, Size distribution.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

M. RĂCUCIU, D. CREANGĂ, P. TUPU, E. BÎRSAN, Comparative study on magnetic nanoparticles colloids stability, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 946-948 (2007)