Jump to main content
Jump to site search


Preparation of Au nanoparticles in a non-polar medium: obtaining high-efficiency nanofluid for Concentrating Solar Power. An experimental and theoretical perspective

Abstract

This paper presents the preparation of Au nanoparticles in a non-polar medium that is a fluid composed of the eutectic mixture of biphenyl and diphenyl oxide that is commonly used in Concentrating Solar Power (CSP) plants. These nanofluids showed enhanced thermal properties, presenting thermal conductivity values 70% higher than those of the base fluid, and isobaric specific heat values up to 10% higher. In turn, an increase of up to 36% was observed in its heat transfer coefficient, which is its efficiency as a heat transfer fluid (HTF). Also, the stability of the nanofluids was analysed using UV-vis spectroscopy, and particle size and ζ potential. The nanofluids with lower concentration agglomerates slowly, considered stables for this application. Thus, these nanofluids are a promising, interesting alternative to the HTF often used in CSP plants. Also, molecular dynamics calculations were performed to better understand how the Au-nanofluid behaves in the presence of a surfactant within a temperature range between 50 and 600 K. The isobaric specific heat and thermal conductivity values followed the same experimental tendency. The analysis of the radial distribution functions (RDFs) and spatial distribution functions (SDFs) showed that, as the temperature rose, an exchange took place between surfactant and diphenyl oxide molecules in a first layer of molecules around the metal. This movement incorporated a directionality that may play a part in the enhanced thermal properties. The surfactant participates as an active component within the Au-nanofluid, contributing to efficient heat transfer processes.

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 31 Jan 2017, accepted on 12 May 2017 and first published on 12 May 2017


Article type: Paper
DOI: 10.1039/C7TA00986K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Preparation of Au nanoparticles in a non-polar medium: obtaining high-efficiency nanofluid for Concentrating Solar Power. An experimental and theoretical perspective

    R. Gómez-Villarejo, J. Navas, E. I. Martín, A. Sanchez-Coronilla, T. Aguilar, J. J. Gallardo, D. M. de los Santos, R. Alcántara, C. Fernández-Lorenzo and J. Martín-Calleja, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA00986K

Search articles by author