Ferrofluids Magnetic Liquid Iron 60 ml, Ferrofluid, Ferromagnetic Fluid, Liquid Iron, Magnetic Ferrofluid, Ferro Fluid Ferrofluids is an amazing liquid which reacts to the influence of a magnetic field. When a magnet is nearby the previously runny liquid suddenly starts to solidify and grow spikes that follow the pattern of the magnetic field produced by the […]
Ferrofluids 20 ml, Magnetic Liquid, Ferromagnetic Fluid, Liquid Iron, Magnetic Ferrofluid, Buy Ferro Fluid
Ferrofluids is a must-have item for any budding scientist. The magnetic liquid can be manipulated by an external magnetic field creating mesmerising effects.
Ferrofluids can be precisely positioned and controlled by an external magnetic field. The forces holding the magnetic fluid in place are proportional to the gradient of the external field and the magnetisation value of the fluid and the retention force of a Ferrofluid in a gap can be adjusted by changing either of these parameters.
Part No.: F4MFF20
Volume: 20 ml
Ferrofluids are composed of nanoscale particles (diameter usually 10 nanometers or less) of magnetite, hematite or some other compound containing iron, and a liquid. This is small enough for thermal agitation to disperse them evenly within a carrier fluid, and for them to contribute to the overall magnetic response of the fluid. This is similar to the way that the ions in an aqueous paramagnetic salt solution (such as an aqueous solution of copper(II) sulfate or manganese(II) chloride) make the solution paramagnetic. The composition of a typical ferrofluid is about 5% magnetic solids, 10% surfactant and 85% carrier, by volume.
Particles in ferrofluids are dispersed in a liquid, often using a surfactant, and thus ferrofluids are colloidal suspensions – materials with properties of more than one state of matter. In this case, the two states of matter are the solid metal and liquid it is in. This ability to change phases with the application of a magnetic field allows them to be used as seals, lubricants, and may open up further applications in future nanoelectromechanical systems.
True ferrofluids are stable. This means that the solid particles do not agglomerate or phase separate even in extremely strong magnetic fields. However, the surfactant tends to break down over time (a few years), and eventually the nano-particles will agglomerate, and they will separate out and no longer contribute to the fluid’s magnetic response.