Blankenburg Gerhard, Hernández-Alpízar Huberth, Lesser-Rojas Leonardo, Chou Chia-Fu
Department of Physics, National Taiwan University, Taipei 10617, Taiwan, R.O.C.
Nanoscience and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 11529, Taiwan, R.O.C.
Nano Lett. 2025 Sep 3;25(35):13128-13135. doi: 10.1021/acs.nanolett.5c00057. Epub 2025 Aug 8.
We present the first observation of AC electroosmosis (ACEO) flow at nanoscale structures in the MHz range, offering new insights into electrokinetic phenomena in this frequency regime. Our findings reveal that ACEO occurs at frequencies much higher than previously anticipated, even surpassing the Debye-Hückel frequency associated with charge relaxation. Despite remaining undetected for over two decades, this result is corroborated by the frequency-size scaling laws derived in this work from the existing ACEO theory. We contextualize these findings within the historical development of electrokinetic phenomena and discuss their implications for the current theoretical framework of ACEO.
我们首次观察到了兆赫兹范围内纳米级结构中的交流电渗流（ACEO），这为该频率范围内的电动现象提供了新的见解。我们的研究结果表明，ACEO发生的频率比之前预期的要高得多，甚至超过了与电荷弛豫相关的德拜-休克尔频率。尽管二十多年来一直未被发现，但这项工作根据现有的ACEO理论推导得出的频率-尺寸缩放定律证实了这一结果。我们将这些发现置于电动现象的历史发展背景中，并讨论它们对当前ACEO理论框架的影响。
