Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T17: Chemical Physics of Plasmonic Nanostructures: Imaging
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 209
Sponsoring
Unit:
DCP
Chair: Michelle Personick, Wesleyan University
Abstract: T17.00002 : Super-Resolution Imaging of Corrosion by Single Molecule Fluorescence Microscopy*
12:06 PM–12:18 PM
Presenter:
Anuj Saini
(Case Western Reserve University)
Authors:
Anuj Saini
(Case Western Reserve University)
Lydia Kisley
(Case Western Reserve University)
Temporal and spatial limitations of the techniques traditionally used are not able image corrosion in situ at the molecular level. Single molecule fluorescence microscopy provides an ideal way to detect in-situ corrosion at the molecular scale. Individual fluorescent molecules present in a sample can be observed at the highest resolution by a highly sensitive camera. Desired chemical process can be studied by selecting dyes that undergo specific fluorogenic reactions. Heterogeneities hidden in the conventional experiments can be determined by observing one molecule at a time. Millisecond time resolutions and sub-diffraction limited, three-dimensional spatial resolutions at ~10 nm can be achieved in-situ for single molecules.
We have demonstrated that redox-sensing molecules that have become fluorescent either by receiving an electron at the cathode or a metal ion at the anode can be detected at the single molecule scale and can quantify corrosion rates. We are now pursuing super-resolution analysis of the dyes to determine the locations of both the cathode and anode at ~10’s nm spatial and ~1’s ms temporal resolutions. Aspects of optical and sample design to achieve super-resolutions will be discussed, along with our spatiotemporal findings for iron and steel, and future prospects for expanding our technique to real world conditions.
*Author ackowledges the support of College of Arts & Sciences, Case Western Reserve University for funding support for this work and would like to thank Prof. Lydia Kisley as all of this work was performed at Kisley Lab, Department of Physics, Case Western Reserve University with their complete support.
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