When nano-particles are stably suspended in liquids (water or oil), it is called nano-fluids. In the case of nano-ferrofluids the nano-particles are metallic and thus magnetized. Stable suspensions of such particles in which the dipolar interaction is suppressed, and therefore do not own magnetic moment, can be precisely controlled by applying an external magnetic field, so far as the nano-dipoles are oriented tangentially to the lines of the applied field. In the dynamics of this process magnetic force, surface energy and gravity act together. The suspenseful interplay of these antithetic forces and the struggle of their synthesis is indicated by the paradoxical "sting character" (Rosenzweig effect), showing the surface of a ferrofluid in an inhomogeneous magnetic field.
An important version of ferro fluids is the so called magnetorheological material. Pigments of pure iron are here disperged in an oil with high viscosity. In the hitherto produced and distributed materials of this type, the high viscosity was so far inevitable, as only in that way the iron pigments, in terms of their size resident in the range of micrometers, could be protected to some extent against agglomeration and sedimentation. In contrast, the magnetorheological fluids, developed and manufactured by Mips Dataline Technologies, although likewise oil-based, are flexible in their viscosity. Added cobalt iron nanoparticles, which follow the laws of the Brownian movement, prevent both the sinking and the clumping of the iron pigments. Therefore, the viscosity of the magnetorheological fluids offered by MDT can be adjusted differently according to the customer's requirements.
When nano-particles are stably suspended in liquids (water or oil), it is called nano-fluids.
Nano-ferrofluids also have optical and chemo-physical properties (density, thermal expansion, thermal conductivity,
In the production of magnetic special inks, we have many years of experience.