I have synthesized iron oxide naoparticles via co precipitation but after drying the powder nanoparticles were not attracted to magnet i want to use it for MR imaging so i need superparamagetic behavior. I don't know if my particles are superparamagnetic or not?
The superparamagnetic iron oxide nanoparticles synthesized at the INM Saarbrücken about 20 years ago had sizes of a few nm only and they could be collected by a magnet e.g. to one side of the bottle (dispersed in water). After removing the magnet, the particles could be dispersed again as they do not retain the magnetisation.
A synthesis receipt is given here, for example: https://publikationen.sulb.uni-saarland.de/bitstream/20.500.11880/24782/1/sm200304.pdf, Section 2.1.
Or: Patent DE000019614136A1 from the year 1996.
Or: https://opus4.kobv.de/opus4-fau/files/5535/AnjaSommerDissertation.pdf (2014)
Hira Waqar
One can try the hysteresis ( Magnetization (B-H) curve) experiment for knowing how long does the nanoparticle retains the magnetization.
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