A flexible fiber carrying a liquid drop may coil inside the drop thereby creating a drop-on-fiber system with an ultra-extensible behavior. During compression, the excess fiber is spooled inside the droplet and capillary forces keep the system taut. During subsequent elongation, the fiber is gradually released and if a large number of spools is uncoiled a high stretchability is achieved. This mechanical behaviour is of interest for stretchable connectors but information, may it be electronic or photonic, usually travels through stiff functional materials. These high Young's moduli, leading to large bending rigidity, prevent in-drop coiling. Here we overcome this limitation by attaching a beam of soft elastomer to the functional fiber, thereby creating a composite system which exhibits in-drop coiling and carries information while being ultra-extensible. We present a simple model to explain the underlying mechanics of the addition of the soft beam and we show how it favors in-drop coiling. We illustrate the method with a two-centimeter long micronic PEDOT:PSS conductive fiber joined to a PVS soft beam, showing that the system conveys electricity throughout a 1900% elongation.

携带液滴的柔性纤维可能会盘绕在液滴内部，从而形成具有超扩展性能的纤维上液滴系统。在压缩过程中，多余的纤维缠绕在液滴内部，毛细管力使系统绷紧。在随后的拉伸过程中，纤维逐渐释放，如果解开大量线轴，则可实现高拉伸性。对于可拉伸的连接器，此机械行为是令人关注的，但信息（可能是电子信息也可能是光子信息）通常会穿过坚硬的功能材料。这些高的杨氏模量导致较大的弯曲刚度，可防止墨滴盘绕。在这里，我们通过附加一束柔软的弹性体来克服这一限制到功能纤维上，从而形成了一种复合系统，该系统表现出液滴内盘绕并在超扩展的同时承载信息。我们提供了一个简单的模型来解释添加软梁的基本机理，并展示了它如何支持液滴内卷取。我们通过将两厘米长的微米级PEDOT：PSS导电纤维连接到PVS软梁上来说明该方法，表明该系统可在1900％的伸长率范围内传递电。