Nanoscale mechanics by tomographic contact resonance atomic force microscopy
Nanoscale mechanics by tomographic contact resonance atomic force microscopy
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DOI：
10.1039/c3nr04981g
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发表时间：
2014-01-01
期刊：
影响因子：
6.7
通讯作者：
Su, Chanmin
中科院分区：
文献类型：
--
作者：
Stan, Gheorghe;Solares, Santiago D.;Su, Chanmin
我们报告了对聚苯乙烯-聚丙烯 (PS-PP) 混合物的可量化的深度相关接触共振 AFM (CR-AFM) 测量，以详细说明弹性模量和机械耗散方面的表面和次表面特征。分析测量参数的深度依赖性以生成断层扫描重建的横截面图像。通过对测量的接触刚度和压痕深度进行适当的归一化，通过线性拟合分析接触刚度的深度依赖性，以获得所探测材料的弹性模量。除了弹性模量之外，在没有先验假设的情况下确定了每种材料上接触的粘合力（短程与长程）的贡献。粘附分析得到了粘附过程中不同粘性响应的明确识别以及压痕过程中耗散功率的接触变形的补充。
We report on quantifiable depth-dependent contact resonance AFM (CR-AFM) measurements over polystyrene-polypropylene (PS-PP) blends to detail surface and sub-surface features in terms of elastic modulus and mechanical dissipation. The depth-dependences of the measured parameters were analyzed to generate cross-sectional images of tomographic reconstructions. Through a suitable normalization of the measured contact stiffness and indentation depth, the depth-dependence of the contact stiffness was analyzed by linear fits to obtain the elastic moduli of the materials probed. Besides elastic moduli, the contributions of adhesive forces (short-range versus long-range) to contact on each material were determined without a priori assumptions. The adhesion analysis was complemented by an unambiguous identification of distinct viscous responses during adhesion and in-contact deformation from the dissipated power during indentation.