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Title: Lanthanide-based laser-induced phosphorescence for spray diagnostics

Abstract

Laser-induced phosphorescence (LIP) is a relatively recent and versatile development for studying flow dynamics. This work investigates certain lanthanide-based molecular complexes for their use in LIP for high-speed sprays. Lanthanide complexes in solutions have been shown to possess long phosphorescence lifetimes (∼1-2 ms) and to emit light in the visible wavelength range. In particular, europium and terbium complexes are investigated using fluorescence/phosphorescence spectrometry, showing that europium-thenoyltrifluoracetone-trioctylphosphineoxide (Eu-TTA-TOPO) can be easily and efficiently excited using a standard frequency-tripled Nd:YAG laser. The emitted spectrum, with maximum intensity at a wavelength of 614 nm, is shown not to vary strongly with temperature (293-383 K). The decay constant of the phosphorescence, while independent of ambient pressure, decreases by approximately 12 μs/K between 323 and 373 K, with the base level of the decay constant dependent on the used solvent. The complex does not luminesce in the gas or solid state, meaning only the liquid phase is visualized, even in an evaporating spray. By using an internally excited spray containing the phosphorescent complex, the effect of vaporization is shown through the decrease in measured intensity over the length of the spray, together with droplet size measurements using interferometric particle imaging. This study shows that LIP,more » using the Eu-TTA-TOPO complex, can be used with different solvents, including diesel surrogates. Furthermore, it can be easily handled and used in sprays to investigate spray breakup and evaporation.« less

Authors:
; ; ; ; ;  [1];  [2]
  1. Mechanical Engineering Department, Eindhoven University of Technology, 5612 AZ Eindhoven (Netherlands)
  2. Institute of Theoretical Chemistry, University of Stuttgart, D-70569 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
22597083
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DROPLETS; EUROPIUM; FLUORESCENCE; IMAGES; LIQUIDS; NEODYMIUM LASERS; PHOSPHORESCENCE; SOLIDS; SOLVENTS; SPECTRA; SPECTROSCOPY; SPRAYS; TERBIUM; TERBIUM COMPLEXES; TRIOCTYLPHOSPHINE OXIDE; TTA; WAVELENGTHS

Citation Formats

Voort, D. D. van der, E-mail: d.d.v.d.voort@tue.nl, Water, W. van de, Kunnen, R. P. J., Clercx, H. J. H., Heijst, G. J. F. van, Maes, N. C. J., Sweep, A. M., Dam, N. J., and Lamberts, T. Lanthanide-based laser-induced phosphorescence for spray diagnostics. United States: N. p., 2016. Web. doi:10.1063/1.4943224.
Voort, D. D. van der, E-mail: d.d.v.d.voort@tue.nl, Water, W. van de, Kunnen, R. P. J., Clercx, H. J. H., Heijst, G. J. F. van, Maes, N. C. J., Sweep, A. M., Dam, N. J., & Lamberts, T. Lanthanide-based laser-induced phosphorescence for spray diagnostics. United States. https://doi.org/10.1063/1.4943224
Voort, D. D. van der, E-mail: d.d.v.d.voort@tue.nl, Water, W. van de, Kunnen, R. P. J., Clercx, H. J. H., Heijst, G. J. F. van, Maes, N. C. J., Sweep, A. M., Dam, N. J., and Lamberts, T. 2016. "Lanthanide-based laser-induced phosphorescence for spray diagnostics". United States. https://doi.org/10.1063/1.4943224.
@article{osti_22597083,
title = {Lanthanide-based laser-induced phosphorescence for spray diagnostics},
author = {Voort, D. D. van der, E-mail: d.d.v.d.voort@tue.nl and Water, W. van de and Kunnen, R. P. J. and Clercx, H. J. H. and Heijst, G. J. F. van and Maes, N. C. J. and Sweep, A. M. and Dam, N. J. and Lamberts, T.},
abstractNote = {Laser-induced phosphorescence (LIP) is a relatively recent and versatile development for studying flow dynamics. This work investigates certain lanthanide-based molecular complexes for their use in LIP for high-speed sprays. Lanthanide complexes in solutions have been shown to possess long phosphorescence lifetimes (∼1-2 ms) and to emit light in the visible wavelength range. In particular, europium and terbium complexes are investigated using fluorescence/phosphorescence spectrometry, showing that europium-thenoyltrifluoracetone-trioctylphosphineoxide (Eu-TTA-TOPO) can be easily and efficiently excited using a standard frequency-tripled Nd:YAG laser. The emitted spectrum, with maximum intensity at a wavelength of 614 nm, is shown not to vary strongly with temperature (293-383 K). The decay constant of the phosphorescence, while independent of ambient pressure, decreases by approximately 12 μs/K between 323 and 373 K, with the base level of the decay constant dependent on the used solvent. The complex does not luminesce in the gas or solid state, meaning only the liquid phase is visualized, even in an evaporating spray. By using an internally excited spray containing the phosphorescent complex, the effect of vaporization is shown through the decrease in measured intensity over the length of the spray, together with droplet size measurements using interferometric particle imaging. This study shows that LIP, using the Eu-TTA-TOPO complex, can be used with different solvents, including diesel surrogates. Furthermore, it can be easily handled and used in sprays to investigate spray breakup and evaporation.},
doi = {10.1063/1.4943224},
url = {https://www.osti.gov/biblio/22597083}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 3,
volume = 87,
place = {United States},
year = {Tue Mar 15 00:00:00 EDT 2016},
month = {Tue Mar 15 00:00:00 EDT 2016}
}