Dept. of Sustainable and Renewable Energy Engineering and Advanced Materials Research Center, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates; Center for Advanced Materials Research, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates.
Dept. of Sustainable and Renewable Energy Engineering and Advanced Materials Research Center, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates; Center for Advanced Materials Research, University of Sharjah, PO Box 27272, Sharjah, United Arab Emirates.
J Colloid Interface Sci. 2018 Jun 15;520:50-57. doi: 10.1016/j.jcis.2018.02.042. Epub 2018 Mar 3.
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.
碳基纳米流体被视为有前途的传热应用的热流体。然而，其他性质，如电导率和电化学行为，通常被忽视，很少被研究，尽管它们对给定应用的整体性能表征很重要。在这项研究中，我们通过静电纺丝合成了基于 PAN 的碳纳米纤维（CNF），并通过电子显微镜、X 射线衍射、X 射线光电子能谱、拉曼光谱和热重分析对其进行了表征。对纳米流体进行了热电和电化学测量。我们发现，尽管 CNF 纳米流体表现出良好的热学和电学性能，且腐蚀性可以忽略不计，但悬浮液在几天内就会沉降。然而，对 CNF（F-CNF）进行酸处理会导致纤维变短和表面含氧物质的出现，使得 F-CNF 基纳米流体在水中具有超过 90 天的优异稳定性，同时具有一致且优异的热学和电学性能。
