Scientific Results

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

Year: 2016

Authors: Mondragon R., Torres-Mendieta R., Meucci M., Mínguez-Vega G., Julia J. E., Sani E.

Autors Affiliation: Universitat Jaume I, Departamento de Ingeniería Mecánica y Construcción, Avenida de Vicent Sos Baynat, s/n, Castelló de la Plana 12071, Spain; Universitat Jaume I, GROC, Institut de Noves Tecnologies de la Imatge (INIT), Avenida de Vicent Sos Baynat, s/n, Castelló de la Plana 12080, Spain; National Institute of Optics, CNR-INO, Largo Enrico Fermi, 6, Firenze I-50125, Italy

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. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)

Journal/Review: JOURNAL OF PHOTONICS FOR ENERGY

Volume: 6 (3)      Pages from: 034001-1  to: 034001-12

More Information: This work was partially funded by the Generalitat Valenciana through the programme PROMETEO-2012-021, and by the Universitat Jaume I through the projects P1.1B2013-43 and P1.1B2013-53. Financial support from the Spanish Ministry of Science FIS2013-40666-P is also acknowledged. The authors are also very grateful to the Servicios Centrales de Instrumentacion Cientifica (SCIC) of the Universitat Jaume I for the use of the femtosecond laser. R. Torres-Mendieta gratefully acknowledges the Generalitat Valenciana support from the Santiago Grisolia scholarship GRISOLIA/2013/015. The Italian bank foundation \”Fondazione Ente Cassa di Risparmio di Firenze\” is gratefully acknowledged for providing the grant for M. Meucci within the framework of the \”SOLE\” and \”SOLE-2\” projects (pratiche n. 2013.0726 and 2014.0711). Thanks are due to Mr. Mauro Pucci and Mr. Massimo D
KeyWords: Ablation; Agglomeration; Cooling systems; Gold; Heat transfer; Laser ablation; Light sources; Nanofluidics; Optical properties; Pulse repetition rate; Sapphire; Solar radiation; Synthesis (chemical); Thermal conductivity; Ultrashort pulses, Extinction coefficients; Heat Transfer enhancement; Nanofluids; Pulsed laser ablation in liquids; Synthesis and characterizations; Thermal applications; Transmittance spectra; Volumetric solar receivers, Pulsed lasers
DOI: 10.1117/1.JPE.6.034001

Citations: 6
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