Cao Zhenxing, Song Zhigong, Liang Fengzhi, An Xiaoguang, Al-Quraishi Karrar K, Wang Min, Chen Jianchao, Ding Dong, Yang Yingchao
Department of Materials Engineering, Changshu Institute of Technology 99 Nansanhuan Rd. Changshu Jiangsu 215500 P. R. China.
Department of Mechanical Engineering, University of Maine 5711 Boardman Hall, Orono ME 04469 USA
RSC Adv. 2020 May 5;10(30):17438-17443. doi: 10.1039/d0ra00366b.
The strong force that originates from breaking covalent bonds can be easily quantified through various testing platforms, while weak interfacial sliding resistance (ISR), originating from hydrogen bonding or van der Waals (vdW) forces, is very challenging to measure. Facilitated by an in-house nanomechanical testing system, we are able to precisely quantify and clearly distinguish the interfacial interactions between individual carbon fibers and several substrates governed by either hydrogen bonding or vdW forces. The specific ISR of the interface dominated by vdW forces is 3.55 ± 0.50 μN mm and it surprisingly increases to 157.86 ± 44.18 μN mm if the interface is bridged by hydrogen bonding. The studies demonstrate that hydrogen bonding rather than vdW forces has great potential in sewing the interface if both surfaces are supportive of the formation of hydrogen bonds. The findings will enlighten the engineering of interfacial interactions and further mediate the entire mechanical performance of structures.
源于共价键断裂的强力可通过各种测试平台轻松量化，而源于氢键或范德华（vdW）力的弱界面滑动阻力（ISR）则极难测量。借助内部纳米力学测试系统，我们能够精确量化并清晰区分由氢键或vdW力控制的单根碳纤维与几种基材之间的界面相互作用。由vdW力主导的界面的特定ISR为3.55±0.50μN·mm，而如果界面由氢键桥接，其会惊人地增加到157.86±44.18μN·mm。这些研究表明，如果两个表面都支持氢键的形成，那么氢键而非vdW力在缝合界面方面具有巨大潜力。这些发现将为界面相互作用的工程设计提供启示，并进一步调节结构的整体力学性能。
