Precipitate the magnetite out of the solution.Filter the liquid through filter paper or a coffee filter.The solution should become bright green (green is the FeCl 2). Mix the liquid until you get a color change.
Add a piece of steel wool to the solution. 
Pour 10 ml of PCB etchant and 10 ml of distilled water into a glass cup. If you are using a stock solution of ferric chloride, then follow the procedure using a 1.5M solution. Commercial PCB etchant is usually 1.5M ferric chloride, to yield 5 grams of magnetite. Ferric chloride is then reacted to produce magnetite. This is done by reducing the ferric chloride (FeCl 3) in PCB etchant to ferrous chloride (FeCl 2). If you aren't starting with magnetite, then the first step is to prepare it. The magnetic particles in this ferrofluid consist of magnetite. You could open a computer disk drive or a speaker to get to the liquid magnet, but it's pretty easy (and fun) to make your own ferrofluid. They are used in low friction seals for rotating shaft motors and computer disk drive seals. You can find ferrofluids in high-end speakers and in the laser heads of some CD and DVD players. One type of ferrofluid you can make uses magnetite for the magnetic particles, oleic acid as the surfactant, and kerosene as the carrier fluid to suspend the particles. A typical ferrofluid is about 5% magnetic solids, 10% surfactant, and 85% carrier, by volume. Ferrofluids can be suspended in water or in an organic fluid. The liquid carrier of a ferrofluid contains a surfactant to prevent the particles from sticking together. These properties can be used to make a liquid that changes its density depending on the strength of the magnetic field and can form fantastic shapes. When the magnetic field is removed, the particles return to random alignment. However, when an external magnetic field is applied, the magnetic moments of the particles align with the magnetic field lines. When no external magnetic field is present, the fluid is not magnetic and the orientation of the magnetite particles is random. 
Magnetic particle imaging image-guided treatment localized heating magnetic fluid hyperthermia magnetic nanoparticles.A liquid magnet, or ferrofluid, is a colloidal mixture of magnetic particles (~10 nm in diameter) in a liquid carrier. We will also discuss how the scale up to human-sized MPI-MFH scanners could proceed. physics and biosafety limitations), hardware implementation, MPI real-time guidance, and new research directions on MPI-MFH. In this review, we will discuss the fundamentals of localized MFH (e.g.
Magnetic fluid image plus#
Hence, the combination of MPI imaging plus real time localized MPI-MFH could soon permit closed-loop high-resolution hyperthermia treatment. In principle, real-time MPI imaging can also guide the location and dosing of MFH treatments. Recently we demonstrated that millimeter-precision localized heating can be achieved by combining magnetic particle imaging (MPI) with MFH. However, focusing traditional MFH to a tumor deep in the body is not feasible because the in vivo wavelength of 300 kHz very low frequency (VLF) excitation fields is longer than 100 m. Magnetic fluid hyperthermia (MFH) has been widely investigated as a treatment tool for cancer and other diseases.
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