Work

Nanoscale AC Electroosmotic Flow and the Frequency–Size Scaling Observed beyond the Charge Relaxation Regime

Year: 2025

Type: article

Abstract: 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.

Source: Nano Letters

DOI: 10.1021/acs.nanolett.5c00057

Authors: Gerhard Blankenburg, Huberth Hernández-Alpízar, Leonardo Lesser-Rojas, Chia-Fu Chou

Institutions: National Taiwan University, Institute of Physics, Academia Sinica, Academia Sinica, Universidad de Costa Rica, Research Center for Applied Science, Academia Sinica

Language: English

Topic: Electrostatics and Colloid Interactions

Subfield: Physical and Theoretical Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500