Photo-thermal characteristics of water-based Fe3O4@SiO2 nanofluid for solar-thermal applications

Saud Khashan, Sawsan Dagher, Salahaddin Al Omari, Nacir Tit, Emad Elnajjar, Bobby Mathew, Ali Hilal-Alnaqbi

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

This work proposes and demonstrates the novel idea of using Fe3O4@SiO2 core/shell structure nanoparticles (NPs) to improve the solar thermal conversion efficiency. Magnetite (Fe3O4) NPs are synthesized by controlled co-precipitation method. Fe3O4@SiO2 NPs are prepared based on sol–gel approach, then characterized. Water-based Fe3O4@SiO2 nanofluid is prepared and used to illustrate the photo-thermal conversion characteristics of a solar collector under solar simulator. The temperature rise characteristics of the nanofluids are investigated at different heights of the solar collector, for duration of 300 min, under a solar intensity of 1000 W m−2. The experimental results show that Fe3O4@SiO2 NPs have a core/shell structure with spherical morphology and size of about 400 nm. Fe3O4@SiO2/H2O nanofluid enhances the photo-thermal conversion efficiency compared with base fluid and Fe3O4/H2O nanofluid, since the silica coating improves both the thermodynamic stability of the nanofluid and the light absorption effectiveness of the NPs. At a concentration of 1 mg/1 ml of Fe3O4@SiO2/H2O, and with the utilization of kerosene into the solar collector, and exposure for radiation for 5 min, the photo-thermal conversion efficiency has shown an enhancement at the bottom of the collector of about 32.9% compared to the base fluid.

Original languageEnglish
Article number055701
JournalMaterials Research Express
Volume4
Issue number5
DOIs
Publication statusPublished - May 2017

Keywords

  • Fe3O4@SiO2 nanoparticle
  • Nanofluid
  • Photo-thermal conversion
  • Solar collector

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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