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D D van der Voort1, N C J Maes2, T Lamberts3

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Laser-induced phosphorescence (LIP) using europium complexes visualizes liquid-phase spray dynamics. This technique effectively studies spray breakup and evaporation, even with diesel surrogates.

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Area of Science:

  • Fluid Dynamics
  • Spectroscopy
  • Materials Science

Background:

  • Laser-induced phosphorescence (LIP) is an emerging technique for flow dynamics.
  • Lanthanide complexes offer long phosphorescence lifetimes and visible light emission.

Purpose of the Study:

  • Investigate lanthanide-based molecular complexes for LIP in high-speed sprays.
  • Evaluate europium-thenoyltrifluoracetone-trioctylphosphineoxide (Eu-TTA-TOPO) for spray diagnostics.

Main Methods:

  • Utilized fluorescence/phosphorescence spectrometry to analyze europium and terbium complexes.
  • Employed a frequency-tripled Nd:YAG laser for excitation of Eu-TTA-TOPO.
  • Measured spectral emission, temperature dependence, and phosphorescence decay constants.

Main Results:

  • Eu-TTA-TOPO efficiently excited, emitting at 614 nm with minimal temperature variation (293-383 K).
  • Phosphorescence decay constant decreased with temperature (12 μs/K, 323-373 K) and varied with solvent.
  • Luminescence observed only in the liquid phase, enabling visualization of evaporating sprays.

Conclusions:

  • LIP with Eu-TTA-TOPO is suitable for studying liquid-phase spray dynamics, including breakup and evaporation.
  • The technique is versatile, applicable with various solvents like diesel surrogates.
  • Eu-TTA-TOPO is easily handled and effective for spray diagnostics.