Iron oxides in cereals (E172)
"The iron that is added to breakfast cereal is just like the iron that goes into metal screws and nails, and is strongly attracted by a magnet. Grinding and crushing the cereal into a liquid mixture frees the added iron particles from the cereal matrix, allowing them to move towards to the magnet." https://www.sciencefocus.com/science/how-to-extract-iron-from-cereal/

Sciencefocus

How to extract iron from cereal

Try not to let this one put you off your corn flakes.

A Magnetic Field Camera for Real-Time Subsurface
Imaging Applications https://www.mdpi.com/2076-3417/11/8/3302/pdf We present a magnetic subsurface imaging system on a smart-phone that employs the built-in magnetometer. The smart-phone’s sensor measures magnetic field strength at sparse locations on a user-defined grid of the surveyed area. Based on the collected data, magnetic field distribution of the entire area is then reconstructed by using an interpolation algorithm, which yields field values in all of three-axial directions. https://www.semanticscholar.org/paper/Magnetic-Subsurface-Imaging-Systems-in-a-Smartphone-Suksmono-Danudirdjo/2d6de9dbdfa6365de3d245af0b72cb75a47f0bcf

#Magnetic #Particle #Imaging (#MPI) uses two core technologies, a specialized imaging hardware and an imaging tracer, to produce 3d images of how a patient’s body is working. Considering these technologies in concert is essential. The imaging system’s resolution, sensitivity, and contrast are driven by the interaction between the imager’s main field gradient and the superparamagnetic iron oxide (SPIO) tracer’s magnetic properties. Additionally, the ability of a tracer to visualize an application, such as looking at the immune system, is driven by the nanoparticle’s behavior in tissue.
https://www.magneticinsight.com/mpi-technology/

"In this process, the magnetization of nanoparticles is specifically manipulated with the help of external magnetic fields, which makes it possible to detect not only their presence but also their spatial position in the human body," says physicist Patrick Vogel, first author of the publication.
https://kurier.at/wissen/wissenschaft/innovativer-scanner-fuer-den-menschlichen-koerper-ohne-strahlung/402537392

MagneticInsight

MPI Technology - MagneticInsight

Magnetic Particle Imaging (MPI) is a new imaging modality that directly detects iron oxide nanoparticle tracers at any point, space and time within the body