Laser polarization-optical oservation of magnetic nanoparticles agglomeration in a liquid medium

An application of laser method of quantitative polarization-optical analysis to the study of structures formed in a magnetic fluid with excess amount of surfactant is described. It is shown, that add of oleic acid at a specified concentration to the colloidal solution of magnetite in kerosene significantly changes the characteristics of the observed polarization magneto-optical responses. This phenomenon was observed even at relatively weak, on the order of several tens of Oersted fields. This is connected with the generation of coagulates, changing their forms under the action of external magnetic field. The developed methodological approaches and the results obtained can be used to study the agglomeration and structure formation processes in magnetic fluids of various types.