Department of Chemical and Biomolecular Engineering, National University of Singapore , 4 Engineering Drive 4, Singapore 117585, Singapore.
ACS Appl Mater Interfaces. 2017 Sep 20;9(37):32220-32226. doi: 10.1021/acsami.7b07711. Epub 2017 Sep 5.
Static charge generated by contact electrification on surfaces can lead to many undesirable consequences such as a reduction in the efficiency of manufacturing processes, damage to equipment, and explosions. However, it is extremely challenging to avoid contact electrification because it is ubiquitous: almost all types of materials charge on contact. Here, we coated materials with naturally occurring polydopamine (PDA) and tannic acid (TA) for preparing noncharging surfaces. Importantly, these coatings are very versatile and can be coated on a wide range of materials, including metals, inorganic materials, semiconductors, and polymers. Once coated, the amount of charge generated was found to reduce dramatically at different humidities. The reduction in charge may be due to the radical-scavenging property of PDA and TA. This simple general approach is ideal for coating the vast variety of materials that need to resist charging by contact electrification.
表面接触起电产生的静电荷会导致许多不良后果，如降低制造过程的效率、损坏设备和引发爆炸。然而，由于接触起电无处不在（几乎所有类型的材料在接触时都会带电），因此要完全避免接触起电极具挑战性。在这里，我们使用天然存在的聚多巴胺（PDA）和单宁酸（TA）对材料进行涂层处理，以制备不带电的表面。重要的是，这些涂层非常通用，可以涂覆在各种材料上，包括金属、无机材料、半导体和聚合物。一旦涂层，在不同的湿度下，所产生的电荷量会明显减少。电荷的减少可能是由于 PDA 和 TA 的自由基清除特性。这种简单的通用方法非常适合涂覆需要防止接触起电的各种材料。
