LONG-TIME SELF-DIFFUSION IN A MODEL FERROFLUID

The long-time self-diffusion coefficients of a concentrated ferrofluid are determined theoretically with the use of the generalized Langevin equation approach. The dependences of the translational and rotationa l diffusions on the concentration and the dipolar strength are studied . These dependences are expressed through the static structural inform ation of the ferrofluid suspension. It is found that the effect of the dipolar interaction leads to the strong suppression of both long-time coefficients compared to the free diffusion coefficients of the parti cles in the infinite dilute case. [S1063-651X(98)01601-8].