Nanoscale AC Electroosmotic Flow and the Frequency–Size Scaling Observed beyond the Charge Relaxation Regime
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.
Authors
- Leonardo Lesser‐Rojas (ORCID: https://orcid.org/0000-0003-4057-9486)
- Chia‐Fu Chou (ORCID: https://orcid.org/0000-0003-0070-5556)
- Gerhard Heinrich Blankenburg
- Huberth Hernández-Alpízar
Institutions
- National Taiwan University (TW)
- Center for NanoScience (DE)
- Universidad de Costa Rica (CR)
- Research Center for Applied Science, Academia Sinica (TW)
- Institute of Physics, Academia Sinica (TW)
- Institute of Atomic and Molecular Sciences, Academia Sinica (TW)
- Institute of Chemistry, Academia Sinica (TW)
- Academia Sinica (TW)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-08-08
- DOI
- https://doi.org/10.1021/acs.nanolett.5c00057
- Citations
- 1
- Primary Topic
- Microfluidic and Bio-sensing Technologies
- Type
- article
- Field-Weighted Citation Impact
- 0.67
Funders
- Asian Office of Aerospace Research and Development
- Academia Sinica
- National Science and Technology Council
- Air Force Office of Scientific Research
- European Office of Aerospace Research and Development