The Applications Of Ferrofluid
A ferrofluid is a materiel with a particularly interesting property: It is a liquid, and behaves exactly like a liquid, in that it flows and drips etc., but it also has magnetic properties, which are usually consigned only to solids. The magnetic properties are exhibited only when in the presence of an externally-applied magnetic field.
They work by having extremely small (on the nano-scale) particles of a ferrite salt suspended in either water or a solvent. Each particle has previously been coated with what is called a surfactant before being placed in the mixture. Surfactants have many applications, but primarily their job is to allow the easier spreading of a solid through a liquid. In this case, they help to ensure that the ferrite salts do not become too clumped together in the liquid.
NASA discovered these fluids nearly 50 years ago, where the advantages were noted immediately: To have a liquid that can be forced to flow by the application of a variably changing magnetic field has multiple applications.
Its Use In Hard Disks
The most common application, which almost every person in the western world now makes use of, is their use in hard disks and other electronic devices. They are typically forced into the gap around the spindle of a hard disk - they are held in place by the magnetic field, and this protects the interior of the disk from dust (any dust entering the interior of a hard disk is likely to irreparably damage it). They are also used in many mechanical devices to reduce friction.
Use in Loudspeakers
Loudspeakers contain a gap surrounding the audio coil. This gap would normally allow too much movement of the speaker cone when the sounds are loud. This means that modern speakers are filled with a ferrofluid, which is held in place by the magnetic field. An interesting property of this is that the fluid's magnetic attraction reduces as heat increases.
This means that, as the speaker cone warms, the fluid closer to it sinks away and the colder fluid flows into its place - this provides an effective cooling system and ensures that the speaker will not have any damage from the heat.
There are multiple other applications of this strange material, which ranges from the electronics industry, to medical; it is used in some art.
Producing the Fluid At Home
If you are interested in this, you will find that ferrofluids can be extremely expensive to purchase unless you happen to own a company that is a able to purchase vast quantities at once. It is fully possible, however, to produce your own fluid, which is of a high enough quality to experiment with at home.
Try this: Purchase some magnetic ink developer, some kerosene and some citric acid. The ink developer acts as the ferrite salt and the citric acid as the surfactant. Mix these two solutions together and then pour into the ink developer until you have a thick mixture. Place a magnet near to the solution and check the effects.
The applications of ferrofluid seem almost endless since its discovery almost 50 years ago people have thought of uses for it in almost every technology, and its use has lowered prices and improved performance of hundreds of technologies.
Questions and Answers
There are hundreds of thousands of compounds that make daily live possible, but chances are most people can only name one or two of these super materials. One of the most overlooked materials employed in thousands of electronics today is ferrofluid. Ferrofluid is a fluid that contains small magnetic particles suspended within the liquid. These magnetic particles react to magnets so that the pull of the magnet has a direct effect on how the ferrofluid operates.
Ferrofluid is used in the construction of magnets which are fluidic and are used in the manufacture of various electrical and household products. To understand why a fluidic magnet forms a part of many products, it is important to first know what is it and its workings. The construction of a liquid magnet is made of substances in microscopic quantities of a colloidal nature and suspended in a carrier which is fluidic, for protection. Typically the carrier would be an organic solvent or water.
Ferrofluid consists of small magnetic iron fragments immersed in oil. The oil aids prevention of any clumping that may occur. The particle can be found in everyday items such as DVDs, CDs, sensors, radio speakers and so much more. Over time, ferrofluid may evaporate if it is not used. If it is kept in a sealed, air tight manner, its life will be prolonged and the fluid will be able to be used time and time again.
Ferrofluid is one of the most interesting applications of science available to the average person today. You can buy ferrofluid kits for remarkably low prices on many online stores. Many of these are science projects intended for amusing and educating both children and adults. As a way to demonstrate what is going on behind the scenes in terms of physics, ferrofluid is really great. The fact that it is actually used in everyday appliances is just the icing on the cake.
Ferrofluid is a stable liquid that contains miniscule magnetic pieces. Iron, magnetite, and cobalt are some of the most common metals. It is vital that these metals are small so they remain in the liquid form when exposed to a magnetic element.
Ferrofluid is a slippery oil that sticks to magnets. Although it takes a strong physics and chemistry background to understand it completely, the basic concept is that very small magnetic pieces of ferro, or iron, are suspended in a fluid, usually oil, with a surfactant (a compound that lowers the surface tension). Without a magnet nearby, the ferrofluid is not magnetized, but once aligned with a magnet, it aligns almost immediately. That is what ferrofluid is.
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These superior magnetic objects are traditionally called rare earth magnets, a terminology that by now has become a misnomer. The neodymium kind, for example, is widely available and mass produced in many countries of the world. Although the samarium-cobalt variety is far superior, it is not as readily available and hence more expensive to procure. The scientific explanation for the sheer magnetic force of both kinds is their electron charge, which can only be enhanced by their concave form.
Steel balls are used for such a wide range of uses; it is almost difficult to believe. Such apparently unrelated designs as jewelry, electric guitars, autos, historic cannons and spray paint all make use of the same essential components. It is fascination to see the commonality in parts between such different machines, and it is also a testament to the versatility and importance of steel balls.
Ferro fluid is an interesting substance that is used for both practical and fun purposes. Aside from electronics and art, the substance is also a fun classroom tool that helps grade school children learn about magnets. In addition, with the flexibility of this substance, more practical applications for it are bound to be discovered in the future.
Ferrofluid is a stable liquid that contains miniscule magnetic pieces. Iron, magnetite, and cobalt are some of the most common metals. It is vital that these metals are small so they remain in the liquid form when exposed to a magnetic element.
Rare earth magnets are well known for producing magnetic fields that enhance health and healing. These fields produce negative ions that penetrate a person's body and bloodstream interacting with your body's natural metabolic functions to reduce pain. Consistent use of magnetic jewelry can sustain physical health long term, by bringing a healing touch to chronic aches and pains to help you feel better.
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