Biglarbeigi Pardis, Morelli Alessio, Bhattacharya Gourav, Ward Joanna, Finlay Dewar, Bhalla Nikhil, Payam Amir Farokh
Department of Pharmacology & Therapeutics, University of Liverpool, Whelan Building, Liverpool, England, L69 3GE, UK.
Nanotechnology and Integrated Bioengineering Centre, School of Engineering, Ulster University, Belfast, BT15 1AP, UK.
Small. 2025 Mar;21(10):e2409410. doi: 10.1002/smll.202409410. Epub 2024 Nov 17.
Deconvoluting the vibrations and harmonics in solid-solid interfaces is crucial for designing materials with improved performance, durability, and functionality. The measured vibrating microcantilever signal in the dynamic atomic force microscopy (AFM) encompasses a multitude of distinct signatures reflecting a diverse array of material properties. Nevertheless, uncertainties persist in decoding these signatures, primarily arising from the interplay between attractive and repulsive forces. Consequently, it is challenging to correlate the generated harmonics within the solid-solid interfaces with the imaged phase and topography of materials, as well as the occasional observed contrast reversal. In this study, the vibration harmonics produced at solid-solid interfaces are correlated, linking them to short-range nano-mechanical characteristics through a comprehensive blend of theory, simulation, and experimental methods. These findings shed light on the roots of harmonic generation and contrast reversals, opening avenues for designing innovative materials with customized properties.
解析固-固界面中的振动与谐波对于设计性能、耐久性和功能性得到改善的材料至关重要。动态原子力显微镜（AFM）中测量的振动微悬臂梁信号包含众多独特特征，反映了各种各样的材料特性。然而，在解读这些特征时仍存在不确定性，这主要源于吸引力和排斥力之间的相互作用。因此，将固-固界面内产生的谐波与材料的成像相和形貌以及偶尔观察到的对比度反转相关联具有挑战性。在本研究中，将固-固界面处产生的振动谐波进行关联，通过理论、模拟和实验方法的综合运用将它们与短程纳米力学特性联系起来。这些发现揭示了谐波产生和对比度反转的根源，为设计具有定制特性的创新材料开辟了道路。
