The electrohydrodynamics of soft interfaces and the processes underlying interfacial charge formation by e.g. unsymmetrical ion adsorption are important aspects of current research on electrosurface phenomena. In particular, the recent progress in both fields greatly benefits from the now-possible accurate evaluation and quantitative interpretation of (ionic) excess conductivities at solid surfaces and in 3D polyelectrolytic architectures, respectively. Achievements in the proper formulation of conceptual and theoretical framework and in the improvement of measurement capabilities have been tightly connected to the work of Johannes (Hans) Lyklema (1930-2017). Considering his valuable contributions, we herein summarize the theoretical basis of surface conductivity analyses, review the experimental options for the quantification of the surface conductivity at macroscopic planar solid-liquid interfaces, and discuss exemplary surface conductivity case studies for soft and hard interfaces permeable or not to ions and fluid flow.

Dedication

Johannes Lyklema (November 23, 1930 – October 31, 2017) was a key scientist in colloid and interface science. He completed his doctorate at the University of Utrecht in 1957 under the supervision of Prof. J. Th. G. Overbeek with a thesis entitled "Adsorption of counterions". In 1963, he was appointed Professor of Physical and Colloid Chemistry at Wageningen Agricultural College (later named Wageningen University), a position he kept until his retirement in 1995. Under his directorate, the Laboratory of Physical and Colloid Chemistry at the Wageningen University became a world-leading research center known for its key research in the fields of interfaces, macromolecules, and electrochemistry. Johannes Lyklema published almost four hundred articles and wrote the five-volume text book ‘Fundamentals of Interface and Colloid Science’, he gave lectures in five languages and on five continents, received honorary doctorates in Belgium, Sweden and Spain, and has been awarded with the Order of the Dutch Lion, to quote only a few of the distinctions and awards he received during his career. In his research, Johannes Lyklema paid particular attention to the analysis and interpretation of electrosurface phenomena. He was founder and chairman of the International Advisory Board of the conference series Electrokinetic Phenomena (ELKIN) and section editor on electrokinetics in this journal (Current Opinion in Colloid and Interface Science). We will remember Johannes Lyklema as an eminent scientist as well as a warm-hearted and outstanding person.

中文翻译：

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宏观软，硬固液界面离子表面传导解开电荷过程的分析

软界面的电流体动力学和界面电荷形成的过程，例如，非对称离子吸附是当前有关电表面现象研究的重要方面。特别是，这两个领域的最新进展分别得益于​​现在可能对固体表面和3D聚电解体系结构中（离子）过剩电导率进行的准确评估和定量解释。正确制定概念和理论框架以及提高测量能力方面的成就与约翰内斯（汉斯）里克莱马（1930-2017）的工作紧密相关。考虑到他的宝贵贡献，我们在此总结了表面电导率分析的理论基础，回顾了宏观平面固液界面处表面电导率定量化的实验选择，

奉献精神

Johannes Lyklema（1930年11月23日至2017年10月31日）是胶体和界面科学领域的关键科学家。1957年，在J. Th。教授的指导下，他在乌得勒支大学完成了博士学位。G.Overbeek，题为“吸附抗衡离子”的论文。1963年，他被任命为瓦赫宁根农业学院（后来更名为瓦赫宁根大学）的物理和胶体化学教授，这一职位一直持续到1995年退休。在他的领导下，瓦赫宁根大学的物理和胶体化学实验室成为世界领先的研究中心，以其在界面，大分子和电化学领域的关键研究而闻名。Johannes Lyklema发表了近四百篇文章，并撰写了五卷教科书《界面和胶体科学基础》，他在五大洲以五种语言授课，并获得了比利时，瑞典和西班牙的名誉博士学位，并被授予荷兰狮勋章，仅列举了他在职业生涯中获得的一些杰出成就和奖项。Johannes Lyklema在他的研究中特别关注电表面现象的分析和解释。他是会议系列国际顾问委员会的创始人兼董事长电动现象（ELKIN），本期刊《电动学》部分编辑（《胶体与界面科学》的最新观点）。我们会记得约翰内斯·莱克勒玛（Johannes Lyklema）是一位杰出的科学家，也是一个热情洋溢的杰出人物。