Influence of medium viscosity on the heating power and the high-frequency magnetic properties of nanobeads containing magnetic nanoparticles

Abstract Magnetic nanoparticles placed in a high frequency alternating magnetic field release heat. This phenomenon can be used to heat and kill cancerous cells, the so-called hyperthermia treatment. Our study focuses on influence of medium viscosity heating power nanobeads (MNBs) containing superparamagnetic nanoparticles. The specific absorption rate (SAR) two types MNBs differing by their size was determined measuring area high-frequency hysteresis loops. Three different behaviors are observed as rises: (i) SAR first drops minimum value for both MNB sizes; (ii) interestingly, only smaller MNBs, after going through minimum, increases again towards steady value; (iii) larger remains constant reaching its value. physical origin these is interpreted, key ingredient explain them being interactions, possibility bead form chains, physically rotate under field. Finally results lead questioning representativeness measurements water intended biological applications, which very from one water.