Synthesis and characterization of gold/water nanofluids suitable for thermal applications produced by femtosecond laser radiation

Abstract

, "Synthesis and characterization of gold/water nanofluids suitable for thermal applications produced by femtosecond laser radiation," J. Photon. Energy 6(3), 034001 (2016), doi: 10.1117/1.JPE.6.034001. Abstract. A laser-based "green" synthesis of nanoparticles (NPs) was used to manufacture gold NPs in water. The light source is a Ti:Sapphire laser with 30 fs FWHM pulses, 800 nm mean wavelength, and 1 kHz repetition rate. The method involves two stages: (1) pulsed laser ablation in liquids and (2) photo-fragmentation (PF). Highly pure and well-dispersed NPs with a diameter of 18.5 nm that can be stored at room temperature without showing any agglomeration over a period of at least 3 months were produced without the need to use any stabilizer. Transmittance spectra, extinction coefficient, NPs agglomeration dynamics, and thermal conductivity of the nanofluids obtained were analyzed before and after being submitted to thermal cycling and compared to those obtained for commercial gold/water suspensions. Optical properties have also been investigated, showing no substantial differences for thermal applications between NPs produced by the laser ablation and PF technique and commercial NPs. Therefore, nanofluids produced by this technique can be used in thermal applications, which are foreseen for conventional nanofluids, e.g., heat transfer enhancement and solar radiation direct absorption, but offering the opportunity to produce them in situ in almost any kind of fluid without the production of any chemical waste.

Characterization of Tin/Ethylene Glycol Solar Nanofluids Synthesized by Femtosecond Laser Radiation

“…A detailed mathematical description of the methodology employed to perform the calculus can be found in Ref. . In short, the experimental extinction coefficient of NPs decoupled from the base fluid contribution can be extracted from the transmission spectra.…”

“…In pulsed laser ablation in liquids (PLAL), the interaction of the laser radiation with a target immersed in a liquid promotes the extraction of material from the surface of the target in the form of NPs, resulting in the fabrication of nanostructured colloids that can be manipulated and manufactured more safely, avoiding inhalation risk . The NPs synthesized by applying laser techniques exhibit outstanding properties in fields such as catalysis, medicine, and energy . In the present paper, the synthesis of a solar nanofluid composed of tin NPs suspended in ethylene glycol through PLAL is reported.…”

Efficient Volumetric Absorption Solar Thermal Platforms Employing Thermally Stable - Solar Selective Nanofluids Engineered from Used Engine Oil

“…Presently, a lot of efforts are underway to tailor solar selective, low cost, high temperature, and long term stable nanoparticle dispersions [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In this direction, we propose that 'used engine oil' (owing to the presence of carbon soot particles) could be employed to synthesize broad wavelength absorption nanoparticle dispersions (volumetrically absorbing solar selective heat transfer fluid).…”

Graphene-based nanofluids: A comprehensive review about rheological behavior and dynamic viscosity

“…Metallic (Au, Ag, Cu, etc.) [13,14], metal oxide (Al 2 O 3 , CuO, Fe 3 O 4 , SiO 2 , TiO 2 , etc.) [15,16], carbonbased (graphite, carbon nanotubes, graphene, nanodiamonds, etc.)…”