期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 500, 期 -, 页码 17-31出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2016.04.016
关键词
Graphene nanoplatelet; Nanofluid; Functionalization; Triethanolamine; Stability; Thermophysical properties
资金
- Ministry of Higher Education and Scientific Research, Iraq
- High Impact Research Grant [UM.C/HIR/MOHE/ENG/45]
- UMRG Grant, University of Malaya, Malaysia [RP012A-13AET]
A novel synthesis procedure is presented for preparing triethanolamine-treated graphene nanoplatelets (TEA-GNPs) with different specific areas (SSAs). Using ultrasonication, the covalently functionalized TEA-GNPs with different weight concentrations and SSAs were dispersed in distilled water to prepare TEA-GNPs nanofluids. A simple direct coupling of GNPs with TEA molecules is implemented to synthesize stable water-based nanofluids. The effectiveness of the functionalization procedure was validated by the characterization and morphology tests, i.e., FTIR, Raman spectroscopy, EDS, and TEM. Thermal conductivity, dispersion stability, and rheological properties were investigated. Using UV-vis spectrometer, a highest dispersion stability of 0.876-relative concentration was reached after 100 days from preparation. Water -based TEA-GNPs nanofluids showed quite Newtonian behavior with an increase in the measured values of viscosity as weight concentration increases and temperature decreases. As the classical models of viscosity underestimated the experimental viscosity data for the TEA-GNPs nanofluids, a correlation was proposed and showed good agreement. Thermal conductivity values increased as the weight concentration, SSA, and temperature increased. Nanofluid containing TEA-GNPs with SSA of 750m(2)/g and 0.1-wt% showed the highest increase in thermal conductivity, i.e., from 0.673 to 0.752 W/mK as the temperature increased from 20 to 40 degrees C. The novel type of nanofluids that were prepared in this study revealed notable potential for use as advanced working fluids in various heat transfer applications. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据