Structure and Energetics of Dislocations at Micro‐Structured Complementary Interfaces Govern Adhesion
Structure and Energetics of Dislocations at Micro‐Structured Complementary Interfaces Govern Adhesion
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微结构互补界面处位错的结构和能量控制粘附
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
C. Hui
中科院分区：
文献类型：
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作者：
C. Jin;A. Jagota;C. Hui
具有互补微通道结构的表面之间可以实现高度增强的附着力。一种弹性材料，聚二甲基硅氧烷（PDMS），被用来制造这种表面，通过光刻成型成具有微通道轮廓的硅母片。对于每一对互补表面，位错缺陷以可见条纹的形式存在，其中脊不能完全插入沟道，并且发现旋转错位角是控制位错分布和粘附强度的关键因素。互补界面之间的附着力，通过传播界面裂纹所需的能量释放率来测量，与平面控制相比，根据不对准角度，可以增强多达30倍。通过改变错位角度来控制位错模式的取向和周期性，使该系统具有显著的可控性。该系统可以作为一个有用的实验工具，帮助研究几何控制的粘着，同时为相互作用的位错和裂纹前沿的稳定性理论提供了一个试验台。
Highly enhanced adhesion can be achieved between surfaces patterned with complementary micro‐channel structures. An elastic material, poly(dimethylsiloxane) (PDMS), is used to fabricate such surfaces by molding into a silicon master with micro‐channel profiles patterned by photolithography. For each pair of complementary surfaces, dislocation defects are observed in the form of visible striations, where ridges fail to fully insert into the channels, and the rotational misalignment angle was found to be the key factor controlling the dislocation distribution and adhesion strength. Adhesion between complementary interfaces, as measured by energy release rate required to propagate an interfacial crack, can be enhanced by up to 30 times compared to a flat control depending on the misalignment angle. The ability to control the orientation and periodicity of dislocation patterns by changing misalignment angle makes this system eminently controllable. This system could be a useful experimental tool in assisting research on geometry‐controlled adhesion, while providing a test‐bed for stability theories of interacting dislocations and crack fronts.