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| 1 | Thickness-dependent wrinkling of PDMS films for programmable mechanochromic responses显示文摘We report a remarkable thickness-dependent wrinkling behavior of oxygen plasma-treated polydimethylsiloxane(PDMS)flms,in which an energy barrier separates the wrinkling mechanics into two regimes.For thick films,the film wrinkles with a constant periodicity which can be precisely predicted by the classic nonlinear finite mechanics.Reducing the film thickness below 1 mm leads to nonuniform wrinkles with an increasing periodicity which gives rise to random scattering and transparency changes under mechanical strains.By tuning the flm thickness,we were able to control both the quality and size of the periodic wrinkles and further design mechanochromic devices featuring briliant structural colors and programmable colorimetric responses.This work sheds light on the fundamental understanding of the wrinkling mechanics of bilayer systems and their intriguing mechanochromic applications. | Zhiwei Li Yun Liu Melinda Marin Yadong Yin | 2020 | Nano Research2020，13，7： | 2 |
| 2 | 固体-液体-基底结构中裂纹形貌形成机制显示文摘试验发现,在固体膜-液体膜-基底结构中,若固体薄膜具有受压的本征应力,往往会发生开裂破坏,且裂纹呈现正弦波浪状或分叉状.采用细观力学的方法,研究产生此种开裂现象的机制.首先假设两种不同的固体薄膜变形单元,并通过能量的方法研究,结果表明,这两种不同的变形模式单元能同时通过不同的排列,组合成复杂的图纹.以变形模式为基础,给出了固体薄膜中微缺陷扩展成裂纹的准则,解释了产生上述裂纹形貌的机制.最后讨论了裂纹起始时间的预测问题. | 贺鹏飞 顾易瓅 郑百林 | 2006 | 同济大学学报(自然科学版)2006，34，10： | 0 |
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