Abstract
Plasmonic nanofluids have found applications in many fields, for example, coolants, solar collectors, and theranostics agents. For such applications, an important parameter is the thermal diffusivity. In this communication, we present an experimental study concerning the dependence of the thermal diffusivity of highly diluted aqueous plasmonic nanofluids containing PVP-coated silver nanoparticles on the concentration. Measurements were made by employing the time resolved mode-mismatched thermal lens technique and the results show an enhancement of the thermal diffusivity, when compared to that of the carrier fluid, on increasing the number density of the nanoparticles and being rather constant as a function of the power of the pump beam.
Highlights
Research in the field of nanostructures has found a source of exciting new phenomena in the case of plasmonic nanofluids and colloids of noble metal nanoparticles, leading to an increasing number of applications, such as theranostics [1], biosensors [2], imaging and spectroscopy [3] and coolants [4], and phototherapy [5]
Previous works that have reported the thermal diffusivity of AgNF employing the thermal lens technique considered silver nanoparticles (AgNPs) produced by radiation [19, 20] and laser ablation [21]
We report on research of the thermal diffusivity of highly diluted silver nanocolloids produced by a chemical reduction approach adapted from Turkevich method, by using the time-resolved mode-mismatched dual-beam thermal lens technique
Summary
Research in the field of nanostructures has found a source of exciting new phenomena in the case of plasmonic nanofluids and colloids of noble metal nanoparticles, leading to an increasing number of applications, such as theranostics [1], biosensors [2], imaging and spectroscopy [3] and coolants [4], and phototherapy [5]. These applications take advantage of both the special optical and the thermal transport properties of the nanoparticles that arise from the nanoscale dimension of the medium and the high surface-to-volume ratio. Besides the thermal lens approach, others techniques such as microflash [22] and the photopyroelectric technique [23] have been employed to determine
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