乙二醇纳米流体的稳定性--理论与实验的一致性
Stability of glycol nanofluids -- the consensus between theory and measurement
摘要：
研究了含有ZnO、Al 2 O3和TiO 2纳米颗粒的稳定纳米流体在丙二醇（PG）、乙二醇（EG）和50wt%的PG和EG在水中的混合物（WPG、WEG）中的配制，在存在和不存在表面活性剂的情况下。通过分散法制备了颗粒浓度为1-9wt%的纳米流体样品。表面活性剂的存在在0- 1重量%/重量%纳米颗粒的范围内。通过目视观察、粒度测定和zeta电位分析评价分散稳定性。总体而言，发现基于PG的样品是最稳定的悬浮液。基础流体对颗粒尺寸的影响和日光对纳米流体稳定性的影响也作为时间的函数进行了检查。TiO 2-PG样品在暴露于阳光下时显示出颜色变化。阳光还导致PG基TiO 2和Al 2 O 3纳米流体在3天的过程中将其粒径增加高达45%。至于稳定性，观察到沉降速度是一个关键参数。最后通过沉降理论与实验的比较，确定了稳定边界，以区分稳定和不稳定的纳米流体。关键词：纳米颗粒、纳米流体、二元醇、配方、稳定性、粒度
英文摘要：
Formulation of stable nanofluids containing ZnO, Al2O3 and TiO2 nanoparticles in propylene glycol (PG), ethylene glycol (EG) and 50wt% mixtures of PG and EG in water (WPG, WEG) were investigated, with and without the presence of surfactants. Nanofluid samples of particle concentrations 1-9wt% were prepared by dispersive method. Surfactant presence was in the range of 0-1wt%/wt% of nanoparticles. Visual observation, particle size measurement and zeta potential analysis were performed to evaluate the dispersion stability. In overall the PG-based samples were found to be the most stable suspensions. The effect of base fluid on particle size and the effect of day light on nanofluid stability were also examined as a function of time. TiO2-PG samples showed a colour change when exposed to sunlight. Sunlight also caused the PG based TiO2 and Al2O3 nanofluid to increase their particle sizes by up to 45% in the course of 3 days. As for stability, the sedimentation velocity was observed to be a key parameter. Finally by comparison of settling theory with experiments, a stability boundary was demarcated to identify stable and unstable nanofluids. Keywords: Nanoparticles, Nanofluids, Glycols, Formulation, Stability, Particle size
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