Electrotunable superlubricity of two-dimensional ZIF-8

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Pub Date : 2024-11-06 DOI:10.1016/j.carbon.2024.119803

Yuxin Li , Lei Liu , Aisheng Song , Kunpeng Wang , Yuhong Liu

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Abstract

Electric field control can actively, dynamically, and repeatably influence the interface friction behavior. The unique properties of two-dimensional (2D) ZIF-8 make it a promising lubricating material for electromechanical devices. The study on the electrotunable superlubricity of 2D ZIF-8 is carried out under longitudinal and transverse electric fields respectively, resulting in an order of magnitude variation in friction coefficient (μ: 0.0037–0.0124). Through the experiments and simulation, the regulation mechanism of electric fields on the lubricating properties of 2D ZIF-8 is attributed to the coupling effect of adhesion regulation and out-of-plane deformation regulation: The weakening of anchoring effect reduces the adhesion between probe and 2D ZIF-8; the tight binding of interfacial charge under longitudinal electric field as well as the increase in surface stiffness caused by lattice tension under transverse electric field, both restrain the out-of-plane deformation during friction. The electrotunable superlubricity of 2D ZIF-8 helps achieve rapid and flexible adjustment of the friction interface in electro-mechanical systems under charged conditions, illuminating the future development prospects for intelligent control.

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二维 ZIF-8 的电可调超润滑性

电场控制可以主动、动态和可重复地影响界面摩擦行为。二维（2D）ZIF-8 的独特性能使其成为机电设备中一种前景广阔的润滑材料。研究分别在纵向和横向电场下对二维 ZIF-8 的电可调超润滑性进行了研究，结果显示摩擦系数（μ：0.0037-0.0124）出现了数量级的变化。通过实验和模拟，电场对二维 ZIF-8 润滑性能的调节机制归结为附着力调节和平面外变形调节的耦合效应：锚定效应的减弱降低了探针与二维 ZIF-8 之间的附着力；纵向电场下界面电荷的紧密结合以及横向电场下晶格张力导致的表面刚度增加都抑制了摩擦过程中的面外变形。二维 ZIF-8 的电可调超润滑性有助于在带电条件下实现机电系统摩擦界面的快速灵活调节，为未来智能控制的发展前景提供了启示。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.