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首页> 美国卫生研究院文献>Nanomaterials >Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability Thermal Conductivity and Rheological Properties
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Two-Dimensional Tungsten Disulfide-Based Ethylene Glycol Nanofluids: Stability Thermal Conductivity and Rheological Properties

机译：二维钨基基乙二醇纳米流体：稳定性导热性和流变性能

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Developing stable nanofluids and improving their thermo-physical properties are highly important in heat transfer applications. In the present work, the stability, thermal conductivity, and rheological properties of tungsten disulphide (WS ) nanoparticles (NPs) with ethylene glycol (EG) were profoundly examined using a particle size analyzer, zeta-sizer, thermal property analyzer, rheometer, and pH measuring system. WS NPs were characterized by various techniques, such as XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared Spectroscopy), FESEM (Field emission scanning electron microscopy), and high-resolution transmission electron microscopy (HRTEM). The nanofluids were obtained with the two-step method by employing three volume concentrations (0.005%, 0.01%, and 0.02%) of WS . The influence of different surfactants (Sodium dodecyl sulphate (SDS), Sodium dodecylbenzenesulfonate (SDBS), Cetyltrimethylammonium bromide (CTAB)) with various volume concentrations (0.05–2%) on the measured properties has also been evaluated. Pristine WS /EG nanofluids exhibit low zeta potential values, i.e., −7.9 mV, −9.3 mV, and −5 mV, corresponding to 0.005%, 0.01%, and 0.02% nanofluid, respectively. However, the zeta potential surpassed the threshold (±30 mV) and the maximum values reached of −52 mV, −45 mV, and 42 mV for SDS, SDBS, and CTAB-containing nanofluids. This showed the successful adsorption of surfactants onto WS , which was also observed through the increased agglomerate size of up to 1720 nm. Concurrently, particularly for 0.05% SDS with 0.005% WS , thermal conductivity was enhanced by up to 4.5%, with a corresponding decrease in viscosity of up to 10.5% in a temperature range of 25–70 °C, as compared to EG. Conversely, the viscoelastic analysis has indicated considerable yield stress due to the presence of surfactants, while the pristine nanofluids exhibited enhanced fluidity over the entire tested deformation range. The shear flow behavior showed a transition from a non-Newtonian to a Newtonian fluid at a low shear rate of 10 s . Besides this, the temperature sweep analysis has shown a viscosity reduction in a range of temperatures (25–70 °C), with an indication of a critical temperature limit. However, owing to an anomalous reduction in the dynamic viscosity of up to 10.5% and an enhancement in the thermal conductivity of up to 6.9%, WS /EG nanofluids could be considered as a potential candidate for heat transfer applications.
机译：在传热应用中显影稳定的纳米流体并改善其热物理性质非常重要。在本作的工作中，使用粒度分析仪，Zeta-Sizer，热性能分析仪，流变仪和碳乙二醇（例如）与乙二醇（例如）具有乙二醇（例如）的稳定性，导热性和流变性质（例如，用乙二醇（例如）。 pH测量系统。通过各种技术，例如XRD（X射线衍射），FTIR（傅里叶变换红外光谱），FESEM（场发射扫描电子显微镜）和高分辨率透射电子显微镜（HRTEM）的各种技术表征。通过使用三种体积浓度（0.005％，0.01％和0.02％）Ws，用两步法得到纳米流体。还评估了不同表面活性剂（十二烷基硫酸钠（SDS），十二烷基苯磺酸钠（SDB），甲基三甲基溴化铵（CTAB），在测量性质上的各种体积浓度（0.05-2％）的影响。丙氨酸/例如纳米流体分别表现出低Zeta电位值，即-7.9mV，-9.3mV，-5mV，分别对应于0.005％，0.01％和0.02％纳米流体。然而，Zeta电位超过阈值（±30mV），最大值达到-52mV，-45mV，42mV，用于SDS，SDB和含CTAB的纳米流体。这表明通过增加的聚集尺寸高达1720nm，将表面活性剂的吸附成功吸附。同时，特别是对于0.005％WS的0.05％SDS，导热率高可达4.5％，相应的粘度降低至25-70℃的温度范围内的粘度高达10.5％。相反，由于表面活性剂的存在，粘弹性分析表明了由于表面活性剂的存在而显着的屈服应力，而原始纳米流体在整个测试变形范围内表现出增强的流动性。剪切流动行为以低剪切速率为10 s的低剪切速率显示从非牛顿到牛顿流体的过渡。除此之外，温度扫描分析表明在一系列温度（25-70°C）的粘度降低，指示临界温度限制。然而，由于动态粘度高达10.5％的异常降低，导热率高达6.9％，WS /例如纳米流体可被认为是传热应用的潜在候选者。

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