The Applications and Properties of Ferrofluids Essay -- Magnets Magnet

Missing FiguresThe purpose of this paper is to c each(prenominal) and explain the properties of ferrofluids. Imagine the applications of a liquid substance that set up be controlled at a distance by a magnetised force. To wee such a liquid is not as simple as liquefying a magnetic solid. Magnetic solids lose their magnetic properties at the temperature higher up the Curie temperature of the substance. At that temperature thermal energy overwhelms the tendency of the electrons to align in regions of similar spins. The Curie temperature is well below the melting point of all normal magnetic solids. (Verschuur, 1993) Ferrofluids overcome this obstacle. They are colloidal suspension of magnetic nanoscale magnetic material in a liquid carrier. This gives the Ferrofluid the properties of normal liquids, that allows the entire liquid to be manipulated to an applied magnetic field. (Berger, 1999)In the 1960?s Stephen Pappell with NASA developed ferrofluids to address the problem of co ntrolling fluids in the zero gravitational force environment of space. (Verschuur, 1993) Ferrofluids were originally used by the space program to draw leak proof seals in satellites. The commercial applications were later recognized. A ferrofluid can behave as a liquid O-ring where a rotating shaft enters any a low- or high-pressure chamber. The ferrofluid is held in place by ageless magnets and form tight seals, eliminating most of the friction produced in a courtly mechanical seal. Rotating shaft seals are found in rotating anode X-ray generators and in vacuum chambers used in the semiconductor industry. Ferrofluid seals are similarly used in high-speed computer disk drives to eliminate slanderous dust particles or other impurities that can cause the sensitive data-reading ... ...e3YVBr1dVcRkJvoh.chem.ucla.edu/classes/Magnetic_fluids/pdf/ChemicalEducationArticle.pdf+bed wetter+aqueous+ferrofluid&hl=en&ct=clnk&cd=2&gl=us&client=firefox-aEnzel, P., Adelman, N., Beckman, K. J ., Campbell, D. J., Ellis, A.B., Lisensky, G. C., (1999)Preparation of an Aqueous-Based Ferrofluid. J. Chem. Educ. Vol. 76, 943. Retrieved may 7, 2008, from http//mrsec.wisc.edu/Edetc/background/ferrofluid/index.htmlFerrotec (2008), Ferrofluid, Retrieved may 9, 2008, from http//www.ferrotec.com/products/ferrofluid/Nave, R. (2000). Surface Tension. HyperPhysics. Retrieved May 7, 2008, from HyperPhysics database.Verschuur, G (1993). Hidden Attraction The Mystery and History of Magnetism. New York Oxford University Press.Willis B, (2001), Brownian Motion, Retrieved May 7, 2008, from http//www.worsleyschool.net/science/files/brownian/motion.html