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Wetting behavior of multi-walled carbon nanotube nanofluids

机译：多壁碳纳米管纳米流体的润湿行为

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Nanofluids-engineered colloidal suspensions in base liquids-have captivated the interest of researchers over the last two decades for various existing as well as emerging technological applications. The main impetus for the synthesis of such novel nanocomposite liquids is the potential to alter properties of the base liquid, such as its viscosity, thermal conductivity, and surface tension, and to introduce specific optical and magnetic properties. Numerous studies suggest trends and explanations for the effects associated with the addition of nanoparticles, and that deviation from the base liquid properties are dependent on nanoparticle concentration. However, there remains a certain ambiguity in the available literature. The wetting behavior and surface tension of nanofluids are particular examples where highly conflicting results exist. In this study, we used multi-walled carbon nanotubes (MWCNTs) functionalized by plasma treatment and dispersed in reverse osmosis water and 99% anhydrous ethanol. Our observations reveal that the surface tension and wetting behavior of the stable aqueous and ethanol-based nanofluids containing plasma functionalized MWCNTs are unaffected by the MWCNT loading up to 120 (0.012) and similar to 210 (0.021) ppm (vol%), respectively. The ethanol-based MWCNT nanofluids allowed us to extend the study to higher loadings, and a linear increase of the surface tension past similar to 200 ppm was observed. Conversely, nanofluids containing non-functionalized or surfactant-stabilized MWCNTs show drastically different contact angle values when compared to the base liquids even at very low concentrations (less than 100 ppm). We demonstrate that the stability of nanofluid and method of stabilization are crucial parameters in determining the wetting behavior of nanofluids.
机译：基础液体的纳米流体工程化胶体悬浮液 - 在过去二十年中捕获了研究人员的利益，以适用于各种现有的和新兴的技术应用。合成这种新型纳米复合液的主要动力是潜在的助碱液的性质，例如其粘度，导热性和表面张力，并引入特定的光学和磁性。许多研究表明了与添加纳米颗粒相关的效果的趋势和解释，并且与基础液体性质的偏差取决于纳米颗粒浓度。但是，可用文献中仍然存在一定的歧义。纳米流体的润湿行为和表面张力是存在高度相互冲突的结果的具体示例。在这项研究中，我们使用通过等离子体处理官能化的多壁碳纳米管（MWCNT），并分散在反渗透水中和99％无水乙醇中。我们的观察结果表明，含有血浆官能化MWCNT的稳定水性和乙醇基纳米流体的表面张力和润湿行为不受高达120（0.012）的MWCNT负荷的影响，并类似于210（0.021）ppm（Vol％）。基于乙醇的MWCNT纳米流体使我们能够将研究延伸到更高的载荷，并且观察到类似于200ppm的表面张力过去的线性增加。相反，含有非官能化或表面活性剂稳定的MWCNT的纳米流体在与基础液体相比，即使在非常低的浓度（小于100ppm）时也会显示出巨大不同的接触角值。我们证明纳米流体的稳定性和稳定方法是确定纳米流体的润湿行为的关键参数。

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