Thermal diffusivity of ferrofluids as a function of particle size determined using the mode-mismatched dual-beam thermal lens technique

摘要: Ferrofluids are colloids of superparamagnetic nanoparticles that envisaged for use in hyperthermia, which is based on nonradiative relaxation after interaction with a high-frequency magnetic field or light. For such applications, an important parameter the thermal diffusivity. In this communication, we present experimental study dependence diffusivity ferrofluids size magnetite by employing mode-mismatched lens technique. The results show huge enhancement increasing average nanoparticles, while number density maintained as constant.