Comparative study of different functionalized graphene-nanoplatelet aqueous nanofluids for solar energy applications
Authors: Vallejo J., Mercatelli L., Martina M.R., Di Rosa D., Dell’Oro A., Lugo L., Sani E.
Autors Affiliation: Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, E-36310, Vigo, Spain; CNR-INO National Institute of Optics, Largo E. Fermi, 6, I-50125, Firenze, Italy; University of Pisa, Department of Energy, Systems, Territory and Constructions Engineering (D.E.S.T.eC.), Largo L. Lazzarino, I-56122, Pisa, Italy; INAF, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Firenze, Italy
Abstract: The optical properties of nanofluids are peculiar and interesting for a variety of applications. Among them, the high light extinction coefficient of nanofluids can be useful in linear parabolic concentrating solar systems, while their properties under high light irradiation intensities can be exploited for direct solar steam generation. The optical characterization of colloids, including the study of non-linear optical properties, is thus a needed step to design the use of such novel materials for solar energy exploitation. In
this work, we analysed two different types of nanofluids, consisting of polycarboxylate chemically modified graphene nanoplatelets (P-GnP) and sulfonic acid-functionalized graphene nanoplatelets (SGnP) dispersed in water, at three concentrations from 0.005 wt% to 0.05 wt%. Moderately stable nanofluids were achieved with favourable light extinction properties, as well as a non-linear optical behaviour under high input solar intensities.
Journal/Review: RENEWABLE ENERGY
Volume: 141 Pages from: 791 to: 801
KeyWords: Direct absorption solar collectors
Concentrating solar power
Solar steam generation
Optical propertiesDOI: 10.1016/j.renene.2019.04.075Connecting to view paper tab on IsiWeb: Click here