Temperature-Sensitive Magnetic Fluids

Stable liquid magnetically soft material consisting of nonmagnetic carrier and surfaced ultrafine complex ferrite (for example, Mn_xZn_1-xFe₂O₄) particles.

• cooling of energy conversion devices, loudspeaker coils and transformers;
• accelerometers, angular position sensors;
• magnetically controlled thermosiphons.

Advantages:

Mn-Zn ferrite containing colloids have higher pyromagnetic coefficients, which allow to design new magnetically controlled thermoregulation systems.

• density r =1.3 g/cm³;
• concentration of solid magnetic phase j =15% (volume);
• magnetic saturation M_s= 30 kA/m;
• dynamic viscosity h =5× 10^-2 ¸ 7× 10^-2× N× m/s².

Production capacities:

up to 25 l/year at laboratory conditions; up to 1000 l/year by a pilot plant.

Reference:

G. Kronkalns, M. Maiorov, E. Blums. Preparation and Properties of Temperature-Sensitive Magnetic Fluids, Magnetohydrodynamics, 1997, 33, No. 1, 112-117 (in Russian), and Magnetohydrodynamics, 1997, 33, No. 1, 92-96 (English translation).