The video is about how to make a magnetic fluid, that is the fluid that will response to the magnetic field placed near to the magnetic fluid. This fluid, or its other name, ferrofluid, is created by mixing a nano size iron particle that can suspend in the mixing or the carrier fluid, oftenly organic solvent or water. To prevent clumping, each of these tiny iron particles are coated with surfactant but in the video above, i don't think the person put a surfactant inside the toner to prevent clumping.
Ferrofluid is able to react with the magnetic field because of its small size iron particle that is small enough for slight thermal agitation to disperse them evenly in the carrier fluid. The dispersion of the iron particles in the carrier fluid caused the mixture to be in colloidal suspension, a system that consists two or more phases of matter. When evenly dispersed, all these iron particles are contributing to the overall magnetic response of the fluid.
Some might ask what does this ferrofluid do. We can see ferrofluid's application in first electronic device such as hard drive. The ferrofluid will be placed between a magnet and the shaft that hold the discs. The ferrofluid will create a barrier and prevent any debris from entering the interior side of your hard drive to make it function smoothly. Ferrofluid can also be used as a contrast material to detect cancer through magnetic resonance imaging. This fluid also has a friction-reducing capabilities and is used in mechanical engineering to glide a magnet across a smooth surface with a minimal resistance.
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