Polymeric thin shells: Measurement of elastic properties at the nanometer scale using atomic force microscopy
Polymeric thin shells: Measurement of elastic properties at the nanometer scale using atomic force microscopy
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DOI：
10.1016/j.mseb.2009.06.016
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发表时间：
2009-12-15
影响因子：
3.6
通讯作者：
Koutsos, Vasileios
中科院分区：
文献类型：
--
作者：
Glynos, Emmanouil;Sboros, Vassilis;Koutsos, Vasileios
我们在水溶液条件下对薄壁空心微球进行了原子力显微镜纳米压缩实验。本研究所使用的微球由类似于10 nm的软凝胶皮肤和类似于40 nm的坚硬的聚合物壳组成。由此得到的力-变形曲线显示出与柔软的超薄外层有关的初始小范围的非线性排斥，然后是用于计算刚性薄壁的杨氏模数的线性区域。线性区域为壳层厚度的数量级，利用线性Reissner关系推导出的弹性模数与相应的本体聚合物模数相当。在较大变形时，我们观察到相似斜率的近线性性态区域，由与屈曲事件相关的各种非线性、台阶和跳跃隔开。(C)2009爱思唯尔B.V.保留所有权利。
We conducted atomic force microscopy nanocompression tests on thin-walled hollow microspheres in aqueous conditions. The microspheres used for this study consist of a similar to 10 nm soft gel skin and an inner similar to 40 nm stiff polymeric shell. The resulting force-deformation curves revealed an initial small-range non-linear repulsion associated with the soft ultrathin outer layer followed by a linear regime which was used to calculate the Young's modulus of the stiff thin wall. The linear regime is of the order of the shell thickness and the elastic modulus deduced using the linear Reissner relationship is comparable to the corresponding bulk polymer modulus. At larger deformations, we observed near-linear behaviour zones of similar slope separated by various non-linearities, steps and jumps which are associated with buckling events. (c) 2009 Elsevier B.V. All rights reserved.