Technology Overview 

A ferrofluid is a stable coll

Technology Overview idal suspension magnetic name tags sub-domain magnetic particles in a liquid carrier. The particles, which have an average size magnetic name badges about 100Å (10 nm), are coated with a stabilizing dispersing agent (surfactant) which prevents particle agglomeration even when a strong magnetic field gradient is applied to the ferrofluid. The surfactant must be matched to the carrier type and must overcome the attractive van der Waals and magnetic forces between the particles. The colloid and thermal stabilities, crucial to many applications, are greatly influenced by the choice magnetic name badges the surfactant. A typical ferrofluid may contain by volume 5% magnetic solid, 10% surfactant and 85% carrier.

In the absence magnetic name badges a magnetic field, the magnetic moments magnetic name badges the particles are randomly distributed and the fluid has no net magnetization.

When a magnetic field is applied to a ferrofluid, the magnetic moments magnetic name badges the particles orient along the field lines almost instantly. The magnetization magnetic name badges the ferrofluid responds immediately to the changes in the applied magnetic field and when the applied field is removed, the moments randomize quickly.

In a gradient field the whole fluid responds as a homogeneous magnetic liquid which moves to the region magnetic name badges highest flux. This means that 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 magnetic name badges the external field and the magnetization value magnetic name badges the fluid. This means that the retention force magnetic name badges a ferrofluid can be adjusted by changing either the magnetization magnetic name badges the fluid or the magnetic field in the region.

Ferrofluid is designed as a component magnetic name badges a device and therefore it must meet specific performance objectives magnetic name badges the device. The selection magnetic name badges ferrofluid depends on many factors such as environments, operating life, etc. There are many different combinations magnetic name badges saturation magnetization and viscosity resulting in a ferrofluid suitable for every application.

The operating life magnetic name badges the product depends on the volatility magnetic name badges the ferrofluid. Products that require long life must use ferrofluids with low evaporation rate or vapor pressure. Also, seals operating at high vacuum must incorporate low vapor pressure fluids. On the other hand, ferrofluids for domain observation must evaporate quickly so that the process time can be minimized. The lower the volatility, the higher the viscosity magnetic name badges the ferrofluid.

Thermal conductivity magnetic name badges a ferrofluid depends linearly on the solid loading. Fluorocarbon based earth magnets have the lowest thermal conductivity magnetic name badges all commercial ferrofluids, therefore they are the least desirable materials for heat transfer applications.

In devices, ferrofluids come in contact with a wide variety magnetic name badges materials. It is necessary to ensure that ferrofluids are chemically compatible with these materials. The fluids may be exposed to hostile gases, such as in the semiconductor and laser industries; to liquid sprays in machine tool and aircraft industries; to lubricant vapors in the computer industry; and to various adhesives in the speaker industry. Furthermore, ferrofluids may be in contact with various types magnetic name badges plastics and plating materials. The surface morphology can also affect the behavior magnetic name badges the fluid. The selection magnetic name badges rare earth magnets  is carefully engineered to meet application requirements.

magnet sweeper
magnet tool holder

Additionally, ferrofluids may be expected to perform at temperature magnetic name badges 150°C continuously or 200°C intermittently, in winter conditions (-20°C) and space environments (-55°C). They may also be required to withstand nuclear radiation without breakdown.

The thermal stability magnetic name badges a ferrofluid is related to particle density. The particles appear to behave like a catalyst and produce free radicals, which lead to cross linking magnetic name badges molecular chains and eventual congealing magnetic name badges the fluid. Catalytic activity is higher at elevated temperatures and, therefore, ferrofluids congeal more rapidly at these temperatures.

Oxidation is another mechanism that contributes to congealing magnetic name badges ferrofluids, and again the higher the temperature, the faster the rate magnetic name badges reaction. The ferrofluids in sealed environments stay in a liquid state significantly longer than those in open air.

High magnetization ferrofluids are magnetic name badges interest as they produce volumetric efficiencies magnetic name badges magnetic circuit designs leading to lightweight and lower cost products. They can also be used to reduce reluctance magnetic name badges magnetic circuits and fringing field thus increasing useful flux density in the air gap. The domain magnetization magnetic name badges magnetite ultimately limits the maximum magnetization value that can be realized in a ferrofluid.

magnet supplier
diametrically , diametrically magnetized , diametric magnets
push pins magnetic push pins pushpin magnetic pins
push pins magnetic push pins pushpin magnetic pins
adhesive with adhesive , n52 buy magnets
magnets for sale , neodymium magnets for sale, n52, buy magnets, where to buy magnets
magnetics toy magnet toys magnet building set, magnetic toys for adults
magnetics toy magnet toys magnet building set, magnetic toys for adults
magnetic sweepers magnetic brooms magnet sweepers magnetic sweeper
magnet bracelets magnetic bracelets magnet jewelry magnetic jewelry

In summary we can say that Ferrofluids are a unique class magnetic name badges material. Ferrofluid technology is well established and capable magnetic name badges solving a wide variety magnetic name badges technical problems. There are many successful applications magnetic name badges this engineering material and there is immense future potential.

Inmany applications, ferrofluid is an active component that contributes towards the enhanced performance magnetic name badges the device. These devices are either mechanical (e.g., seals, bearings and dampers) or electromechanical (e.g., loudspeakers, stepper motors and sensors) in nature. In other cases, ferrofluid is employed simply as a material for nondestructive testing magnetic name badges other components such as magnetic tapes, stainless steels and turbine blades. When correctly applied, Ferrofluid can produce dramatic improvements in a products’ performance; or achieve a level magnetic name badges performance unattainable by any other technology or product.

Ferrotec Corporation (formerly Ferrofluidics) has led the development magnetic name badges Ferrofluidic®technology since 1968 and has worked closely with many companies as their new product teams incorporate ferrofluids in next-generation products. With a comprehensive fluid development and applications laboratories in both the US and Japan, and an experienced staff magnetic name badges scientists and engineers available to assist you, Ferrotec is well placed to help you solve your engineering challenges using ferrofluid.

magnet toy
magnet toys
magnet wire
magnet wire home depot
magnetic badges