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Synthesis and characterization of additive graphene oxide nanoparticles dispersed in water: Experimental and theoretical viscosity prediction of non-Newtonian nanofluid
Mathematical Methods in the Applied Sciences ( IF 2.9 ) Pub Date : 2020-04-05 , DOI: 10.1002/mma.6381
Yang Xu 1 , Quyen Nguyen 2 , Omid Malekahmadi 3 , Ramin Hadi 3 , Zahra Jokar 3 , Ali Mardani 3 , Arash Karimipour 3 , Ramin Ranjbarzadeh 4 , Zhixiong Li 5, 6 , Quang-Vu Bach 7
Affiliation  

Graphene oxide (GO) is a mixture of carbon, oxygen, and hydrogen. GO sheets used to make tough composite materials, thin films, and membranes. GO-water nanofluid's rheological behavior was investigated in this research. Various mass fractions: 1.0, 1.5, 2.0, 2.5, and 3.5 mg/ml; different temperature ranges: 25°C, 30°C, 35°C, 40°C, 45°C, and 50°C; and several shear ranges: 12.23, 24.46, 36.69, 61.15, 73.38, and 122.3 s−1 were studied. X-ray diffraction analysis (XRD), energy dispersive X-ray analysis (EDX), dynamic light scattering analysis (DLS), and Fourier-transform infrared (FTIR) tests studied to analyze phase and structure. Field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM) tests studied for microstructural observation. The stability of nanofluid was checked by the zeta-potential test. Non-Newtonian behavior of nanofluid, similar to power-law model (with power less than one), revealed by results. Also, results showed that viscosity increased by increment of mass fraction, and on the contrary, increment of temperature, caused a decrease in viscosity. Then, to calculate nanofluid's viscosity, a correlation presented 1.88% (for RPM = 10) and 0.56% (for RPM = 100) deviation. Finally, to predict nanofluid's viscosity in other mass fractions and temperatures, an artificial neural network has been modeled by R2 = 0.99. It can be concluded that GO can be used in thermal systems as stable nanofluid with agreeable viscosity.

中文翻译:

分散在水中的添加剂氧化石墨烯纳米粒子的合成和表征:非牛顿纳米流体的实验和理论粘度预测

氧化石墨烯 (GO) 是碳、氧和氢的混合物。GO 片材用于制造坚韧的复合材料、薄膜和膜。本研究研究了 GO-water 纳米流体的流变行为。各种质量分数:1.0、1.5、2.0、2.5 和 3.5 mg/ml;不同的温度范围:25°C、30°C、35°C、40°C、45°C和50°C;和几个剪切范围:12.23、24.46、36.69、61.15、73.38 和 122.3 s -1进行了研究。X 射线衍射分析 (XRD)、能量色散 X 射线分析 (EDX)、动态光散射分析 (DLS) 和傅里叶变换红外 (FTIR) 测试用于分析相和结构。研究了用于微观结构观察的场发射扫描电子显微镜 (FESEM) 和透射电子显微镜 (TEM) 测试。纳米流体的稳定性通过 zeta 电位测试来检验。结果揭示了纳米流体的非牛顿行为,类似于幂律模型(功率小于 1)。此外,结果表明,粘度随质量分数的增加而增加,相反,温度的升高导致粘度降低。然后,为了计算纳米流体的粘度,相关性呈现 1.88%(对于 RPM = 10)和 0.56%(对于 RPM = 100)偏差。最后,预测纳米流体'R 2 = 0.99。可以得出结论,GO 可作为具有适宜粘度的稳定纳米流体在热系统中使用。
更新日期:2020-04-05
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