Abstract :
The grafting number of surfactant coating on magnetite nanoparticles in a magnetic colloid (magnetic fluid), defined as the number of surfactant
molecules adsorbed per surface area of nanoparticles, was successfully obtained from the atomic absorption spectroscopy and transmission
electron microscopy.We found that the increases of grafting number with the molar concentration of surfactant and the adsorption temperature can
be quantitatively measured, making it possible to produce well controlled, stable magnetic colloids that are precursors for many magnetic
nanostructures.
