Adhesion of microchannel-based complementary surfaces.
Adhesion of microchannel-based complementary surfaces.
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基于微通道的互补表面的粘附。
作者：
A. Singh;Ying Bai;Nichole Nadermann;A. Jagota;C. Hui
我们表明，高度增强和选择性的粘附可以实现互补的微通道结构图案化的表面之间。一种弹性材料，聚（二甲基硅氧烷）（PDMS），被用来制造这样的表面，通过模塑成一个硅主微通道的轮廓图案通过光刻。我们在互补和不匹配的微通道/微柱表面上进行了粘附测试。粘附力，所需的能量释放率传播的界面裂纹，可以提高高达40倍的互补接口，相比，一个平坦的控制，并略有提高一些特殊的noncomplementary样品，尽管几乎可以忽略不计的其他不匹配的表面的粘附。对于每个互补表面，我们观察到可见条纹形式的缺陷，其中支柱未能完全插入通道中。互补微通道表面之间的粘附通过裂纹捕获机制和柱与通道之间的摩擦的组合而增强，并且通过缺陷的存在而减弱。
We show that highly enhanced and selective adhesion can be achieved between surfaces patterned with complementary microchannel structures. An elastic material, poly(dimethylsiloxane) (PDMS), was used to fabricate such surfaces by molding into a silicon master with microchannel profiles patterned by photolithography. We carried out adhesion tests on both complementary and mismatched microchannel/micropillar surfaces. Adhesion, as measured by the energy release rate required to propagate an interfacial crack, can be enhanced by up to 40 times by complementary interfaces, compared to a flat control, and slightly enhanced for some special noncomplementary samples, despite the nearly negligible adhesion for other mismatched surfaces. For each complementary surface, we observe defects in the form of visible striations, where pillars fail to insert fully into the channels. The adhesion between complementary microchannel surfaces is enhanced by a combination of a crack-trapping mechanism and friction between a pillar and channel and is attenuated by the presence of defects.