Most natural fibrillar adhesive structures feature spatula-shaped caps as a common adhesive element. The spatula-shaped tips endow adhesive fiber arrays with on demand adhesion, allowing them to maximize adhesion in a given direction and facilitate effortless detachment. Replication of off-center spatula ends synthetically, a key contributor to directional adhesion, remains a fabrication challenge. In this work, a method to feature synthetic microfiber adhesives with off-center caps is proposed. This new method decouples the shape and placement dependency between the cap and the stem, providing endless possibilities in positioning of the tip with respect to the stem and the two-dimensional shape and the material of both the cap and the stem. Experiments of directional adhesion were carried out to demonstrate switchable adhesion relevant for pick & place type applications, and the ability to generate high friction and easy removal. Fibers with off-center caps were shown to pr...

中文翻译：

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具有形状控制的偏心帽的仿生纤维状粘合剂，可实现可切换和定向粘合。

大多数天然纤维状粘合剂结构都采用刮刀状帽作为常见的粘合剂元件。刮刀形尖端赋予粘性纤维阵列按需粘合，使它们能够在给定方向上最大限度地粘合，并有助于轻松分离。偏心刮刀末端的复制合成是定向粘附的关键因素，仍然是一个制造挑战。在这项工作中，提出了一种具有偏心帽的合成微纤维粘合剂的方法。这种新方法消除了帽和杆之间的形状和位置依赖性，为尖端相对于杆的定位以及二维形状和帽和杆的材料提供了无限的可能性。进行了定向粘附实验以证明与拾放型应用相关的可切换粘附，以及产生高摩擦和易于去除的能力。带有偏心帽的光纤被证明可以...