Data from: Adhesion force mapping on wood by atomic force microscopy: influence of surface roughness and tip geometry

This study attempts to address the interpretation of atomic force microscopy (AFM) adhesion force measurements conducted on the heterogeneous rough surface of wood and natural fibre materials. The influences of wood surface roughness, tip geometry and wear on the adhesion force distribution are examined by cyclic measurements conducted on wood surface under dry inert conditions. It was found that both the variation of tip and surface roughness of wood can widen the distribution of adhesion forces, which are essential for data interpretation. When a common Si AFM tip with nanometre size is used, the influence of tip wear can be significant. Therefore, control experiments should take the sequence of measurements into consideration, e.g. repeated experiments with used tip. In comparison, colloidal tips provide highly reproducible results. Similar average values but different distributions are shown for the adhesion measured on two major components of wood surface (cell wall and lumen). Evidence supports the hypothesis that the difference of the adhesion force distribution on these two locations was mainly induced by their surface roughness.

本研究旨在解析针对木材与天然纤维材料非均质粗糙表面开展的原子力显微镜（Atomic Force Microscopy, AFM）附着力测试结果。本研究通过在干燥惰性环境下对木材表面开展循环测试，探究了木材表面粗糙度、探针几何形貌与探针磨损对附着力分布的影响。研究发现，探针形貌变化与木材表面粗糙度均会拓宽附着力分布区间，该结果对于测试数据的解析至关重要。当使用常规纳米级硅基AFM探针时，探针磨损的影响会较为显著，因此对照实验需考量测试序列的影响，例如采用已使用过的探针开展重复测试。相较而言，胶体探针可获得重复性极佳的测试结果。针对木材表面两大主要组分（细胞壁与管腔）测得的附着力结果显示，二者的平均附着力相近，但附着力分布存在显著差异。相关实验证据佐证了这一假说：上述两个区域的附着力分布差异主要源于其表面粗糙度的不同。