Yasir BilalM. Luqman HashmiM. Abdullah

Introduction Mechanism ApplicationsJournal Papers and new researchCritical analysisDiscussion

Its a liquid magnetA fluid in which fine particles of iron, magnetite or cobalt are suspended in an oil surfactant

In the 1960s Stephen Pappell at NASA first developed ferrofluids as a method for controlling fluids in spaceMagnets and/or magnetic fields were used to control this magnetic fluidCurrently applications of Ferrofluids in space have been replaced by more economical fluids

Small magnetite particles are held in colloidal suspension due to interparticle electrostatic repulsion. This is brought about by the attraction of the hydroxide anion to the magnetite particles which in turn attract the positive tetramethyl-ammonium cations.education.mrsec.wisc.edu/background/ferrofluid/

Can stick to a magnetWill take on the 3-dimensional shape of the magnetic field that passes through itChanges its density in proportion to the strength of the magnetic field thats applied to it

LithographySealing TechnologyBio-MedicalDomain ImagingOil spill removal

Magnetic inks are printed onto paper money and used for bar codes for identification purposesMakes counterfeiting more difficult

Used for bearing seals in hard drivesFluid is held in place by magnets creating a magnetic seal (o-ring) for high speed rotation

Have been used in medicine since the 1960s

Magnetically position organs during abdominal or brain surgery

Attaching drugs to the surface of magnetic particles and use magnetic fields to hold the drug at the site where it is needed

magnetic tapes, hard and floppy disks Magnetic heads,crystalline and amorphous alloyssteels Geological rocks

Multifunctional Porous Materials Through FerrofluidsYorexis Gonzlez-Alfaro, Pilar Aranda, Francisco M. Fernandes, Bernd Wicklein, Margarita Darder andEduardo Ruiz-HitzkyAdvanced MaterialsVolume 23,Issue 44,pages 52245228, 2011

Magnetic colloid petroleum oil spill clean-up of ocean surface, depth, and shore regions US 2012/0211428 A1

In the MIT researchers scheme, water-repellent ferrous nanoparticles would be mixed with the oil, which could then be separated from the water using magnets. The researchers envision that the process would take place aboard an oil-recovery vessel, to prevent the nanoparticles from contaminating the environment. Afterward, the nanoparticles could be magnetically removed from the oil and reused.

Advantages Easy manufacturingReflect lightReduce frictionMicroscopic magnetsDrawbackCost Particles do not stick togetherLoss of magnetic properties at high temperature

Smart materialWidely research area Future aspects To reduce friction Advanced drug targeting with magnetsFor medical applications for treating ulcers brain tumor and cancer remedy

http://www.carolina.com/physics/aboutferro.asphttp://www.ferrotec.com/usa/ferrofluid_technology_overview.htmhttp://www.zarm.uni-bremen.de/2forschung/ferro/basic_info/applic/applic.htmJournal of Chemical Education, Volume 76, No. 7, July 1999. http://JChemEd.chem.wisc.edu

***********