Estudo das propriedades fototérmicas de nanofluidos de prata

Abstract

Plasmonic nanofluids have been used in several applications in many different fields, such as cooling fluids, solar collectors and theranostic agents. Related to this area, the understanding of thermal diusivity is extremely important and the various techniques that exist for its determination can offer divergent results. The use of photothermal

techniques shows presents a great sensitivity to measure various parameters of nanoflu- ids. In this work, silver spherical nanoparticles with a average diameter of 32 nm were

synthesized by the Turkevich method and coated with the surfactant Polyvinylpyrroli- done (PVP). Nonlinear refractive index and thermal diffusivity measurements of silver

nanofluids were performed using the Z-Scan and Thermal Lens techniques.We obtained a relation that describe the dependence of the refractive index index of refraction with the frequency and also for of the thermal diffusivity with the nanoparticles concentration. These results were corroborated since the technique used in this work was replicated for the water thermal diffusion analysis, whose obtained value is in agreement with the expected literature value.