In Situ Investigation of Adhesion Mechanisms on Complex Microstructured Biological Surfaces
In Situ Investigation of Adhesion Mechanisms on Complex Microstructured Biological Surfaces
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DOI：
10.1002/admi.202000969
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发表时间：
2020-08-26
影响因子：
5.4
通讯作者：
Le Houerou, Vincent
中科院分区：
文献类型：
--
作者：
Kumar, Charchit;Favier, Damien;Le Houerou, Vincent
最近，植物表面因其令人着迷的功能而引起了人们的关注，特别是粘合性能，这在很大程度上是由于其多样化的表面结构。本文有助于复杂生物表面形态的粘附力学研究。三种不同植物叶子的弹性体复制品，包括大尺度（0.5-100μm）的形态，具有不同的形状和复杂性，并且具有光滑的表面，通过与粘性探针接触进行研究。为了进行精确的粘附力测量，超纳米压头根据 Johnson-Kendall-Roberts (JKR) 力学进行了改进，并配备了原位真实接触可视化系统。关于预载条件，系统地研究了所有表面上的粘附力。根据赫兹和 JKR 理论对结果进行分析，并确定潜在的形态特异性机制。对接触图像力的仔细检查揭示了由不同预载和地形引起的附着-分离机制。在具有精细微观结构和复杂形貌的表面上观察到预紧力对附着力的显着影响，而对于其余两种没有记录到具体的影响。总体比较表明，粗锥形图案和复杂微观结构上的粘附力显着降低。由生物形态产生的特定粘附机制可以为设计仿生界面提供帮助。
Recently, plant surfaces have attracted attention given their fascinating functionalities, particularly adhesive properties, which largely result from their diverse surface structuring. This paper contributes to the adhesion mechanics investigation on complex biological surface morphologies. Elastomeric replica of three different plant leaves, comprising morphologies at a broad scale (0.5-100 mu m), with distinct shapes and complexity, and of a smooth surface are studied in contact with an adhesive probe. To perform precise adhesion measurements, an ultra-nanoindenter is modified based on the Johnson-Kendall-Roberts (JKR) mechanics and equipped with an in situ real-contact visualization system. The adhesion force on all surfaces is systematically investigated regarding the preload conditions. The results are analyzed in the light of Hertzian and JKR theories, and underlying morphology-specific mechanisms are identified. A close examination of contact image-force reveals attachment-detachment mechanisms, arising from different preloads and topographies. A significant influence of preload on adhesion is observed on the surface with fine microstructuring and complex morphology, no specific influence is recorded for the remaining two. An overall comparison demonstrates a significant reduction in adhesion on coarse cone-shape patterns and complex microstructures. The specific adhesion mechanisms arising from biological morphologies may offer assistance to design bioinspired interfaces.