Competing fracture in kinetically controlled transfer printing
Competing fracture in kinetically controlled transfer printing
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DOI：
10.1021/la701555n
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发表时间：
2007-12-04
期刊：
影响因子：
3.9
通讯作者：
Rogers, John A.
中科院分区：
文献类型：
--
作者：
Feng, Xue;Meitl, Matthew A.;Rogers, John A.
通过动态可切换粘附到弹性体印模的转印显示出作为从供体基底拾取微结构和微器件并将它们印刷到接收基底的强大的微制造方法的前景。这可以看作是两个界面的竞争断裂。本文研究了模型转印系统中的竞争断裂力学，该系统由三个层压材料组成：弹性基底、弹性薄膜和粘弹性构件（印模）。当系统被剥离时，基底和薄膜之间的界面失效，或者薄膜和印模之间的界面失效。膜/印模界面的速度依赖性导致对临界分离速度的预测，在该临界分离速度以上，膜和基底之间发生分离（即，拾取）并且在该位置之下在膜和印模之间发生分离（即，印刷）。实验验证了这一预测，使用薄膜的黄金粘附在玻璃上，和理论治疗扩展到考虑竞争断裂，因为它适用于离散的微观物体。温度在动力学控制的转移印刷中起着重要的作用，其影响使得在降低的温度下拾取可印刷的物体并在升高的温度下印刷它们是有利的。
Transfer printing by kinetically switchable adhesion to an elastomeric stamp shows promise as a powerful micromanufacturing method to pickup microstructures and microdevices from the donor substrate and to print them to the receiving substrate. This can be viewed as the competing fracture of two interfaces. This paper examines the mechanics of competing fracture in a model transfer printing system composed of three laminates: an elastic substrate, an elastic thin film, and a viscoelastic member (stamp). As the system is peeled apart, either the interface between the substrate and thin film fails or the interface between the thin film and the stamp fails. The speed-dependent nature of the film/stamp interface leads to the prediction of a critical separation velocity above which separation occurs between the film and the substrate (i.e., pickup) and below which separation occurs between the film and the stamp (i.e., printing). Experiments verify this prediction using films of gold adhered to glass, and the theoretical treatment extends to consider the competing fracture as it applies to discrete micro-objects. Temperature plays an important role in kinetically controlled transfer printing with its influences, making it advantageous to pickup printable objects at the reduced temperatures and to print them at the elevated ones.