Optically accessible electrodynamic levitator for in-situ LIBS characterization of iron particles under reactive conditions
Year: 2026
Type: article
Abstract: This study presents an optically accessible electrodynamic levitator that enables quantitative single-particle analysis using laser-based diagnostics. In the context of thermochemical energy storage, the oxidation behavior of individual iron (Fe) microparticles is investigated. Laser-induced breakdown spectroscopy (LIBS) is further developed to determine the particle-specific oxygen-to-iron (O/Fe) ratio in-situ, providing direct insight into the surface composition during oxidation. Diffuse backlight-illumination (DBI) is applied in parallel to visualize the laser pulse-particle interaction and plasma dynamics. The defined, contact-free particle positioning achieved by the electrodynamic levitator ensures reproducible laser coupling, stable plasma conditions, and improved quantitative accuracy compared to previous free particle jet analyses (Fe, Fe 2 O 3 ). The electrodynamic levitator enables highly repeatable positioning of microparticles (Fe, Fe 3 O 4 , Fe 2 O 3 ), regardless of their morphology and composition, which represents an important step in the diagnostic development for the analysis of reactive particles.
Source: Optics Express
DOI: 10.1364/oe.586612
Institution: Technische Universität Darmstadt
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: Störungsresistentes RamanSpektrometer mit applikationsadaptierter Datenanalyse zur in situ/operando Diagnostik in chemischen Reaktoren und reaktiven Strömungen, G2826279268, Ziel dieses Projektes ist die Charakterisierung des Einflusses von WasserstoffAddition auf die lokalen Flammenstrukturen und NOxEmissionen bei vorgemischten, laminaren Gegenstromflammen für die kohlenstofffreie Verbrennung von Ammoniak mittels kombinierter Raman/Rayleigh und NOLIFSpektroskopie.
OpenAlex ID: W7123336433