Faculty of Chemistry, Department of Physical and Analytical Chemistry, University of Oviedo. Av. Julián Clavería, 8 33006-Oviedo, Spain.
Nanotechnology. 2017 Dec 8;28(49):495704. doi: 10.1088/1361-6528/aa93ca.
One of the main drawbacks in the application of metal-oxide nanoparticles as lubricant additives is their poor stability in organic media, despite the good anti-wear, friction-reducing and high-load capacity properties described for these materials. In this work, we present a novel procedure to chemically cap the surface of ZrO nanoparticles (ZrONPs) with long hydrocarbon chains in order to obtain stable dispersions of ZrONPs in non-aqueous media without disrupting their attributes as lubricant additives. C-8, C-10 and C-16 saturated flexible chains were attached to the ZrONP surface and their physical and chemical characterization was performed by transmission electron microscopy, thermogravimetric analysis, attenuated total reflectance Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy and solid-state nuclear magnetic resonance. The dispersion stability of the modified ZrONPs in non-aqueous media was studied using static multiple light scattering. Tribological tests demonstrated that dispersions of the long-chain capped ZrONPs in base lubricating oils exhibited low friction coefficients and improved the anti-wear properties of the base oil when compared with the raw lubricating oil.
作为润滑剂添加剂，金属氧化物纳米粒子的主要缺点之一是其在有机介质中的稳定性差，尽管这些材料具有良好的抗磨、减摩和高承载能力。在这项工作中，我们提出了一种新的方法，即用长碳氢链对 ZrO 纳米粒子（ZrONPs）的表面进行化学封端，以获得在非水介质中稳定分散的 ZrONPs 而不会破坏它们作为润滑剂添加剂的属性。C-8、C-10 和 C-16 饱和柔性链被连接到 ZrONP 表面，并通过透射电子显微镜、热重分析、衰减全反射傅里叶变换红外光谱、X 射线光电子能谱和固态核磁共振对其物理和化学性质进行了表征。通过静态多重光散射研究了改性 ZrONPs 在非水介质中的分散稳定性。摩擦学测试表明，与基础润滑油相比，长链封端的 ZrONPs 在基础润滑油中的分散体表现出较低的摩擦系数，并提高了基础油的抗磨性能。
