Abstract：
Capillary metal tubes have attracted considerable interest for flexible electronics, portable devices, trace sampling, and detection. Tailoring the microstructure and wettability inside the capillary tubes is of paramount importance, yet it presents great difficulty because of the spatial confinement. Here, the coupling effect is revealed between the fluidic and electric field induced by bubble motion in a confined space during anodic oxidation. By controlling the bubble regeneration and flow rate, uniform and superhydrophilic TiO2 nanotube arrays are developed throughout the inner surface of an ultrafine Ti tube with a diameter of 0.4 mm and length of 1000 mm, equivalent to an aspect ratio of 2500 that is the largest value being ever reported. The inner surface of a capillary tube is further coated with a polytetrafluoroethylene layer and explored as a sensing needle for liquid detection in terms of concentration and species. This study provides an innovative approach to tailor the microstructure and wettability in a confined space for functional capillary tubes.
摘要：
毛细管金属管已经引起了人们对柔性电子设备的极大兴趣，便携式设备，痕量采样，和检测。定制毛细管内部的微观结构和润湿性是最重要的，然而，由于空间限制，它提出了很大的困难。这里,在阳极氧化过程中，气泡在有限空间中运动引起的流体和电场之间表现出耦合效应。通过控制气泡再生和流速，在直径为0.4mm，长度为1000mm的超细Ti管的整个内表面形成均匀和超亲水的TiO2纳米管阵列，相当于2500的纵横比，这是有史以来报告的最大值。毛细管的内表面进一步涂覆有聚四氟乙烯层,并且探索作为用于在浓度和种类方面进行液体检测的感测针。这项研究提供了一种创新的方法来定制功能毛细管在密闭空间中的微观结构和润湿性。
