Size Dependent Mechanical Properties of Monolayer Densely Arranged Polystyrene Nanospheres

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• 作者：Peng Huang ; Lijing Zhang ; Qingfeng Yan ; Dan Guo ; Guoxin Xie
• 刊名：Langmuir
• 出版年：2016
• 出版时间：December 13, 2016
• 年：2016
• 卷：32
• 期：49
• 页码：13187-13192
• 全文大小：402K
• ISSN：1520-5827

文摘

In contrast to macroscopic materials, the mechanical properties of polymer nanospheres show fascinating scientific and application values. However, the experimental measurements of individual nanospheres and quantitative analysis of theoretical mechanisms remain less well performed and understood. We provide a highly efficient and accurate method with monolayer densely arranged honeycomb polystyrene (PS) nanospheres for the quantitatively mechanical characterization of individual nanospheres on the basis of atomic force microscopy (AFM) nanoindentation. The efficiency is improved by 1–2 orders, and the accuracy is also enhanced almost by half-order. The elastic modulus measured in the experiments increases with decreasing radius to the smallest nanospheres (25–35 nm in radius). A core–shell model is introduced to predict the size dependent elasticity of PS nanospheres, and the theoretical prediction agrees reasonably well with the experimental results and also shows a peak modulus value.