The influence of the nanoparticles dilution upon the structure of molecular-coated magnetic fluid

In this study the transmitted light intensity of three biocompatible magnetic fluid samples based on dimercaptosuccinic-coated maghemite nanoparticles was investigated using the typical birefringence experimental setup. The field dependence of the transmitted light intensity follows the typical second-order Langevin profile as the nanoparticle volume fraction reduces by dilution of the stock sample. As the stock sample is diluted the field dependence of the transmitted light intensity is analyzed in terms of changes in the sample morphology which is described by a distribution function of the chain-like structure length.