Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, Gyeongbuk, 37673, Republic of Korea.
Department of Mechanical Engineering (Integrated Engineering Program), Kyung Hee University, 1732, Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea.
Adv Mater. 2023 Jun;35(26):e2300699. doi: 10.1002/adma.202300699. Epub 2023 Apr 25.
The triboelectric series is a generally accepted method for describing the triboelectric effect. It provides a way to control the double face of the ubiquitous triboelectric effect: causes of unpredictable accidents and the resultant surface charge as energy sources. However, previous studies have been biased in solids despite being observed in liquids (liquid-solid contact electrification). Therefore, a liquid triboelectric series is necessary to be established to manipulate the liquid triboelectric effect according to the appropriate goal. In this study, a liquid triboelectric series is first established to describe the triboelectric properties of each liquid when contact electrification occurs with a solid surface. The liquid triboelectric series covers electrolytes, organic solvents, oxidants, and higher sugar alcohols. Common chemical groups can be derived from the liquid triboelectric series that hydroxyl groups enhance, and benzene groups suppress the liquid triboelectric effect. The results are demonstrated by the amplified efficiency of an energy harvester and particle contamination after surface washing. This study will play a pivotal role in understanding the liquid-solid contact electrification phenomenon and providing new perspectives on the applications of the liquid triboelectric effect.
摩擦起电序列是描述摩擦起电效应的一种常用方法。它提供了一种控制普遍存在的摩擦起电效应的两面性的方法：不可预测事故的原因和作为能源的表面电荷。然而，尽管在液体中观察到了（液-固接触带电），但以前的研究偏向于固体。因此，有必要建立液体摩擦起电序列，以便根据适当的目标来操纵液体摩擦起电效应。在这项研究中，首先建立了液体摩擦起电序列，以描述当固体表面发生接触带电时每种液体的摩擦电性质。液体摩擦起电序列涵盖了电解质、有机溶剂、氧化剂和高糖醇。可以从液体摩擦起电序列中推导出常见的化学基团，其中羟基基团增强，苯基团抑制液体摩擦起电效应。这些结果通过能量收集器效率的放大和表面清洗后的颗粒污染得到了证明。这项研究将在理解液-固接触带电现象方面发挥关键作用，并为液体摩擦起电效应的应用提供新的视角。
