Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Poster: Colloids and Complex Liquids

CPP 20.21: Poster

Tuesday, March 12, 2013, 18:15–20:15, Poster C

Gradient diffusion in mono- and bidisperse magnetic fluids — •Alla Muratova¹, Alexey Ivanov¹, and Sofia Kantorovich^{1, 2} — ¹Ural Federal University, Lenin av. 51, 620000, Ekaterinburg, Russia — ²Sapienza, University of Rome, Piazza A. Moro 5, 00185, Rome, Italy

We present the results on the mobility and diffusion coefficients in the systems of magnetic dipolar particles. In our study we firstly investigate the influence of chain formation and polydispersity of particles on self-diffusion. Here, we use Density Functional Approach and direct calculations to elucidate why the formation of chains leads to the average decrease of mobility in monodisperse systems, but in the case of a bidisperse particle size distribution the particle mobility becomes a function of the fractional composition. As the second step we calculate the diffusion coefficients using the mobility coefficients obtained before for both mono- and bidisperse systems of magnetic particles. Here, we mainly focus on the diffusion induced by the gradient of the total ferroparticle density. Finally, we use the diffusion coefficients to calculate the distribution of chains in the gravity gradient. We extensively compare our results to the simulation data and find them in a good agreement.