TY - JOUR
T1 - Acid-functionalized carbon nanofibers for high stability, thermoelectrical and electrochemical properties of nanofluids
AU - Said, Zafar
AU - Allagui, Anis
AU - Abdelkareem, Mohammad Ali
AU - Alawadhi, Hussain
AU - Elsaid, Khaled
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/6/15
Y1 - 2018/6/15
N2 - 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.
AB - 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.
KW - Carbon nanofiber
KW - Corrosion
KW - Nanofluid
KW - Stability
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=85043377489&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2018.02.042
DO - 10.1016/j.jcis.2018.02.042
M3 - Article
C2 - 29529460
AN - SCOPUS:85043377489
SN - 0021-9797
VL - 520
SP - 50
EP - 57
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -