Acid-functionalized carbon nanofibers for high stability, thermoelectrical and electrochemical properties of nanofluids

Zafar Said*, Anis Allagui, Mohammad Ali Abdelkareem, Hussain Alawadhi, Khaled Elsaid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

Abstract

Carbon-based nanofluids are viewed as promising thermal fluids for heat transfer applications. However, other properties, such as electrical conductivity and electrochemical behavior, are usually overlooked and rarely investigated despite their importance for the overall performance characterization of a given application. In this study, we synthesized PAN-based carbon nanofibers (CNF) by electrospinning, and characterized them using electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermogravimetric analysis. Thermoelectrical and electrochemical measurements were carried out on nanofluids. We found that, although CNF nanofluids exhibit good thermal and electrical properties with a negligible corrosive effect, the suspensions tend to sediment within a few days. However, acid treatment of CNF (F-CNF), which resulted in the shortening of the fibers and the appearance of surface-oxygenated species, made F-CNF-based nanofluids exhibit superior stability in water that extended for more than 90 days, with consistent and superior thermal and electrical properties.

Original languageEnglish
Pages (from-to)50-57
Number of pages8
JournalJournal of Colloid and Interface Science
Volume520
DOIs
Publication statusPublished - 15 Jun 2018
Externally publishedYes

Keywords

  • Carbon nanofiber
  • Corrosion
  • Nanofluid
  • Stability
  • Thermal conductivity

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