Study of thermo-optical properties of nanofluids of gold and silver nanoparticles funcionalized with polyethylene glycol and sodium dodecyl sulfate in water using thermal lens spectroscopy

Solutions of nanofluids composed of dispersed metal-nanoparticles in water, possess exceptional thermo-optical properties. In the present work was studied the variation in the thermo-optical properties of nanofluids composed of metal-nanoparticles with different surfactants. It was used the single-pulsed laser excitation dual-beam mode mismatched termal lens spectroscopy (TLS) for liquid samples. An experimental set-up of TLS was used and the thermal diffusibility and the dn/dT value of different nanofluids were studied, for this an Ar+ laser (514nm and 15.4mW) was used as excitation beam and a He-Ne laser (635nm) as a probe beam. The experiment showed that the thermal diffusibility of nanofluids is affected by the nature of the stabilizer, also it was observed an increase in the thermal diffusibility of nanofluids with respect at water without nanoparticles, for nanofluids with functionalized nanoparticles with PEG and SDS the heat transfer decreases compared to nanofluids without stabilizers.