Influence of the Structure and Parameters of a Magnetic Fluid on Magnetophoresis in a thin Layer

The purpose of the work is to study in external gradient magnetic fields the regularities of magnetophoresis processes in magnetic fluids in thin optically transparent layers and their relationship with the structuring and parameters of the magnetic fluid system.  

Metods. To study the influence of the structure and parameters of a magnetic fluid on the dynamics of the magnetophoresis process, a set of experimental installations was created for the long-term effect of inhomogeneous magnetic fields of various configurations. As the images, the images of magnetic fluid with different dispersed composition were studied, including non-centrifuged ones containing large magnetic particles.

Results. In magnetic fluid samples with different dispersed composition, the phenomenon of magnetophoresis in a thin layer in inhomogeneous magnets of various configurations, created by an annular permanent magnet, as well as an axial magnetic system based on unipolar magnets, has been investigated. Based on the phenomenological equations of magnetophoresis and Brownian diffusion, a theoretical interpretation of the dynamics of the magnetophoresis process in magnetic fluid systems in an inhomogeneous magnetic field is proposed.

Conclusion. It was found that for a sample containing larger magnetic nanoparticles, the magnetophoresis process proceeds 5 times faster. Methods and installations for the study of magnetophoresis in magnetic fluids in inhomogeneous magnetic fields of various configurations have been developed, which are applicable to assess the size of magnetic particles and the stability of magnetic fluids, to study the processes of separation and structure formation in them under prolonged exposure to high-gradient magnetic fields. 

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