IBS Center for Soft and Living Matter, ‡Department of Chemistry, and §Department of Biomedical Engineering, Ulsan National Institute of Science and Technology (UNIST) , UNIST-gil 50, Ulsan 689-798, South Korea.
ACS Nano. 2017 Nov 28;11(11):10914-10923. doi: 10.1021/acsnano.7b04644. Epub 2017 Nov 7.
Placed at a water/air interface, particles of porphyrin-based MOFs (metal-organic frameworks) cut from large-area films display efficient, multiple-use autonomous motility powered by release of solvents incorporated in the MOF matrix and directionality dictated by their shapes. The particles can be refueled multiple times and can achieve speeds of ca. 200 mm·s with high kinetic energy per unit of chemical "fuel" expended (>50 μJ·g). Efficiency of motion depends on the nature of the fuel used as well as the microstructure and surface wettability of the MOF surface. When multiple movers are present at the interface, they organize into "open" structures that exhibit collective, time-periodic motions.
置于水/气界面，从大面积薄膜切下的基于卟啉的 MOFs（金属-有机框架）颗粒通过释放包含在 MOF 基质中的溶剂并由其形状决定方向，表现出高效、可重复使用的自主运动。这些颗粒可以多次加油，并且可以以每单位化学“燃料”消耗的高动能达到约 200mm·s 的速度 (>50μJ·g)。运动效率取决于所用燃料的性质以及 MOF 表面的微观结构和表面润湿性。当多个移动器存在于界面时，它们会组织成“开放”结构，表现出集体、周期性的运动。
