State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, China.
School of Mechanical Engineering, Beijing Institute of Technology , Beijing 100081, China.
ACS Appl Mater Interfaces. 2017 Nov 1;9(43):38146-38152. doi: 10.1021/acsami.7b12591. Epub 2017 Oct 23.
Smart nanocontainers with stimuli-responsive property can be used to fabricate a new kind of self-lubricating nanocomposite, while the practical potential of the metal-organic frameworks (MOFs) as nanocontainers for lubricants has not been realized. In this work, mesoporous Cu-BTC MOFs storing oleylamine nanocomposites were explored from synthesis and microstructure to self-lubricating characterization. The stress stimuli-responsiveness behavior of the Cu-BTC storing oleylamine (Cu-BTCO) for lubrication has been investigated by subjecting it to macroscopic ball-on-disc friction tests. The steady-state coefficients of friction (COFs) of the Cu-BTC nanocomposites without lubricants were ca. 0.5. In contrast, after oleylamine as the lubricant was incorporated into the Cu-BTC container in the nanocomposite, ultralow friction (COF, ca. 0.03) was achieved. It has been demonstrated that the improved lubricating performance was associated with the lubricating film which was in situ produced by the chemical reaction between the oleylamine released from the nanocontainer and the friction pairs. Therefore, the nanocomposite with smart Cu-BTC container holds the promise of realizing extraordinary self-lubricating properties under stress stimuli.
具有刺激响应性能的智能纳米容器可用于制造新型自润滑纳米复合材料，而金属有机骨架（MOFs）作为润滑剂纳米容器的实际潜力尚未得到实现。在这项工作中，从合成和微观结构方面探索了负载油胺纳米复合材料的介孔 Cu-BTC MOFs，并对其自润滑性能进行了研究。通过宏观球盘摩擦试验研究了 Cu-BTC 负载油胺（Cu-BTCO）用于润滑的应力刺激响应行为。没有润滑剂的 Cu-BTC 纳米复合材料的稳态摩擦系数（COF）约为 0.5。相比之下，将油胺作为润滑剂掺入纳米复合材料中的 Cu-BTC 容器后，摩擦系数可低至 0.03。研究表明，润滑性能的提高与由纳米容器中释放的油胺与摩擦副之间的化学反应原位产生的润滑膜有关。因此，具有智能 Cu-BTC 容器的纳米复合材料有望在应力刺激下实现非凡的自润滑性能。
