Nanoscale AC Electroosmotic Flow and the Frequency-Size Scaling Observed beyond the Charge Relaxation Regime.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40779538.
- Also identified by DOI 10.1021/acs.nanolett.5c00057 and PMC identifier 12412179.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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.