Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates.
Composite Pillars with a Tunable Interface for Adhesion to Rough Substrates.
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DOI：
10.1021/acsami.6b11642
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发表时间：
2017-01-11
影响因子：
9.5
通讯作者：
Hensel R
中科院分区：
文献类型：
--
作者：
Fischer SC;Arzt E;Hensel R
在以前的研究中已经成功地证明了合成纤维干胶粘剂对具有光滑表面的硬物的临时和可逆附着的好处。然而，表面粗糙度会导致拉拔应力的急剧降低，因此需要修改设计概念。为此，我们引入了由机械刚性杆和软尖端层组成的圆柱形两相单柱。对光滑和粗糙基材的附着力显示超过传统支柱结构。通过改变软尖端层的厚度、杨氏模量的比值和两相界面的曲率，可以调节粘附特性。对于粗糙的基材，获得的附着力值与在光滑基材上获得的附着力值相似。我们的复合柱概念克服了目前由表面粗糙度引起的实际限制，并开辟了粗糙度无处不在的应用领域。
The benefits of synthetic fibrillar dry adhesives for temporary and reversible attachment to hard objects with smooth surfaces have been successfully demonstrated in previous studies. However, surface roughness induces a dramatic reduction in pull-off stresses and necessarily requires revised design concepts. Toward this aim, we introduce cylindrical two-phase single pillars, which are composed of a mechanically stiff stalk and a soft tip layer. Adhesion to smooth and rough substrates is shown to exceed that of conventional pillar structures. The adhesion characteristics can be tuned by varying the thickness of the soft tip layer, the ratio of the Young’s moduli and the curvature of the interface between the two phases. For rough substrates, adhesion values similar to those obtained on smooth substrates were achieved. Our concept of composite pillars overcomes current practical limitations caused by surface roughness and opens up fields of application where roughness is omnipresent.