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Structure and Energetics of Dislocations at Micro- Structured Complementary Interfaces Govern Adhesion

机译：微结构互补界面上位错的结构和能量学控制粘附

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摘要

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.
机译：可以在用互补微通道结构图案化的表面之间实现高度增强的粘合。弹性材料聚二甲基硅氧烷（PDMS）用于通过模制成具有微通道轮廓的硅母版来制作此类表面，该微通道轮廓通过光刻技术进行了图案化。对于每对互补表面，以可见条纹的形式观察到位错缺陷，其中脊未能完全插入通道中，并且旋转未对准角被发现是控制位错分布和粘附强度的关键因素。与扩展界面（取决于未对准角度）相比，通过传播界面裂纹所需的能量释放速率来衡量，互补界面之间的粘合力最多可提高30倍。通过改变未对准角度来控制位错图案的方向和周期性的能力使得该系统非常可控。该系统可能是有用的实验工具，可协助研究几何控制的附着力，同时为相互作用的位错和裂纹前沿的稳定性理论提供测试平台。

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  • 来源
    《Advanced Functional Materials》 |2013年第27期|3453-3462|共10页
  • 作者

    Congrui jin; Anand Jagota; Chung-Yuen Hui;

  • 作者单位

    Field of Theoretical and Applied Mechanics Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca, NY 14850, USA;

    Department of Chemical Engineering and Bioengineering Program, Lehigh University Bethlehem, PA 18015, USA;

    Field of Theoretical and Applied Mechanics Sibley School of Mechanical and Aerospace Engineering Cornell University Ithaca, NY 14850, USA;

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