Jin X, Kasal B
Organische Baustoffe und Holzwerkstoffe , TU Braunschweig , Hopfengarten 20, 38102 Braunschweig , Germany.
Organische Baustoffe und Holzwerkstoffe, TU Braunschweig, Hopfengarten 20, 38102 Braunschweig, Germany; Fraunhofer Wilhelm-Klauditz-Institut WKI, Bienroder Weg 54E, 38108 Braunschweig, Germany.
R Soc Open Sci. 2016 Oct 19;3(10):160248. doi: 10.1098/rsos.160248. eCollection 2016 Oct.
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.
本研究试图解决在木材和天然纤维材料的异质粗糙表面上进行原子力显微镜（AFM）粘附力测量的解释问题。通过在干燥惰性条件下对木材表面进行循环测量，研究了木材表面粗糙度、针尖几何形状和磨损对粘附力分布的影响。研究发现，针尖变化和木材表面粗糙度都会使粘附力分布变宽，这对数据解释至关重要。当使用常见的纳米尺寸硅AFM针尖时，针尖磨损的影响可能很大。因此，对照实验应考虑测量顺序，例如使用用过的针尖进行重复实验。相比之下，胶体针尖可提供高度可重复的结果。木材表面两个主要成分（细胞壁和细胞腔）上测量的粘附力显示出相似的平均值，但分布不同。有证据支持这样的假设，即这两个位置上粘附力分布的差异主要是由它们的表面粗糙度引起的。
