美国西北大学J. Fraser Stoddart团队报道了泵送盒驱动的主动机械吸附。相关研究成果于2021年10月21日发表在国际知名学术期刊《科学》。

在过去的一个世纪里，吸附在平衡系统中得到了广泛的研究，重点是与物理吸附有关的范德华相互作用和化学吸附中的电子相互作用。

该文中，研究人员演示了机械吸附，这是由于非平衡泵送在吸附剂和吸附质之间形成机械键而产生的。该活性吸附模式已在接枝有分子泵阵列的金属有机框架表面实现。吸附质从一个定义明确的隔室（溶液主体）运输到另一个定义明确的隔室（界面），从而以化学电容器的形式产生大的电位梯度，其中能量以亚稳状态存储。机械吸附从根本上扩展了吸附现象的范围和潜力，并为控制表面和界面化学提供了一种变革性方法。

附：英文原文

Title: Active mechanisorption driven by pumping cassettes

Author: Liang Feng, Yunyan Qiu, Qing-Hui Guo, Zhijie Chen, James S. W. Seale, Kun He, Huang Wu, Yuanning Feng, Omar K. Farha, R. Dean Astumian, J. Fraser Stoddart

Issue&Volume: 2021-10-21

Abstract: Over the past century, adsorption has been investigated extensively in equilibrium systems with a focus on the van der Waals interactions associated with physisorption and electronic interactions in the case of chemisorption. Here, we demonstrate mechanisorption, which results from nonequilibrium pumping to form mechanical bonds between the adsorbent and the adsorbate. This active mode of adsorption has been realized on surfaces of metal-organic frameworks grafted with arrays of molecular pumps. Adsorbates are transported from one well-defined compartment—the bulk—to another well-defined compartment—the interface—thereby creating large potential gradients in the form of chemical capacitors wherein energy is stored in metastable states. Mechanisorption extends, in a fundamental manner, the scope and potential of adsorption phenomena and offers a transformative approach to control chemistry at surfaces and interfaces.

DOI: abk1391

Source: https://www.science.org/doi/10.1126/science.abk1391