Electric conductivity of magnetic fluid at ordinary temperature

摘要

Electric productivity of magnetic fluid (MF) is discussed. Supposing the surfactant active is adhered magnetic particles when the electronic property is studied. And the studied MF is stable suspension. Considering the electric conductivity of solid magnetic particles (γ_s) and carrier liquid (γ_l) which is big. And the electric conductivity of MF is discussed when the voltage is pressed at the two ends of MF tube. In the discussions, the viscous force (f_n) of carrier and magnetic force (f_m) have an important action on the electric conductivity of MF. (A) Supposing γ_s γ_l, and the viscous force (f) is big enough. MF has a weak electric conducting ability. Supposing γ_s γ_l, and the viscous force f_nis small. The particles could slip the leash of viscous force colliding each other to deliver electric energy. Then MF indicates relative good electric conductivity. Perhaps the weak agglomeration is appeared because the magnetic force generated by the electric current. (B) Supposing γ_s≈ γ_ι, and the electric conductivity of MF could not affected by viscous force f. The electric conductivity of MF may be dominated by the particles and carrier together. (C)Supposing y_s<;<; γ_l, the electric conductivity of MF may be dominated by carrier. The experiment on MF of water carrier and carboxyl group carrier (Fe₃O₄as the magnetic particles) in this paper could certify the rationality of discussion (A).