Chouhan Ajay, Kumari Sangita, Sarkar Tarun K, Rawat Sooraj S, Khatri Om P
CSIR-Indian Institute of Petroleum, Mohkampur, Dehradun 248005, India.
Academy of Scientific and Innovative Research, Ghaziabad 201002, India.
ACS Appl Mater Interfaces. 2020 Nov 18;12(46):51785-51796. doi: 10.1021/acsami.0c12122. Epub 2020 Nov 5.
The present investigation demonstrates a green and scalable chemical approach to prepare aminoborate-functionalized reduced graphene oxide (rGO-AmB) for aqueous lubricants. The chemical, structural, crystalline, and morphological features of rGO-AmB are probed by XPS, FTIR, Raman, XRD, and HRTEM measurements. The spectroscopic analyses revealed the multiple interaction pathways between rGO and AmB. rGO-AmB exhibited long-term dispersion stability and improved the thermal conductivity of water by 68%. The thermal conductivity increased with increasing concentration of rGO-AmB and temperature. rGO-AmB as an additive to water (0.2%) enhanced the tribological properties of a steel tribopair under the boundary lubrication regime by the significant reduction in friction (70%) and wear (68%). The tribo-induced gradual deposition of an rGO-AmB-based thin film facilitated the interfacial sliding between the steel tribopair and protected it from the wear. The ultralow thickness, excellent dispersibility in water, high thermal conductivity, intrinsic low frictional properties, and good affinity toward the tribo-interfaces make rGO-AmB a potential candidate for aqueous lubricants.
本研究展示了一种绿色且可扩展的化学方法，用于制备用于水性润滑剂的氨基硼酸盐功能化还原氧化石墨烯（rGO-AmB）。通过XPS、FTIR、拉曼光谱、XRD和HRTEM测量对rGO-AmB的化学、结构、晶体和形态特征进行了探究。光谱分析揭示了rGO与AmB之间的多种相互作用途径。rGO-AmB表现出长期的分散稳定性，并使水的热导率提高了68%。热导率随rGO-AmB浓度和温度的升高而增加。作为水的添加剂（0.2%），rGO-AmB在边界润滑条件下显著降低了钢摩擦副的摩擦（70%）和磨损（68%），从而增强了其摩擦学性能。摩擦诱导的基于rGO-AmB的薄膜的逐渐沉积促进了钢摩擦副之间的界面滑动，并保护其免受磨损。rGO-AmB的超薄厚度、在水中的优异分散性、高导热性、固有的低摩擦性能以及对摩擦界面的良好亲和力使其成为水性润滑剂的潜在候选材料。
