Determining eosin as a groundwater migration tracer by capillary electrophoresis/laser‐induced fluorescence using a multiwavelength laser

Brumley, William C.; Farley, John W.

doi:10.1002/elps.200305514

Cited by 9 publications

(5 citation statements)

References 12 publications

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“…Eosin-Y is a solid acid xanthene (natural anionic) dye [ 25 ]. Besides widespread application in the field of medicine [ 26 ] and biology [ 27 ], the fluorescence tracer is used for planar droplet sizing for alcohol and water sprays [ 14 , 21 , 28 ], and as groundwater migration tracer [ 29 ]. To investigate the effects on partial evaporation of droplets on the fluorescence signal, the dye Eosin-Y is dissolved in ethanol and water.…”

Section: Methodsmentioning

confidence: 99%

Fluorescence Spectroscopy for Studying Evaporating Droplets Using the Dye Eosin-Y

Koegl

Weiß

Zigan

2020

Sensors

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Laser-induced fluorescence (LIF) spectroscopy using dyes is frequently applied for characterization of liquids and two-phase flows. The technique is utilized e.g., for mixing studies, thermometry, or droplet sizing. One major application of the LIF technique combined with Mie-scattering is the planar measurement of droplet sizes in spray systems. However, its uncertainty is determined, among others, by varying dye concentration and temperature changes occurring during mixing and droplet evaporation. Systematic experimental investigations are necessary to determine the influence of dye enrichment effects on the LIF-signal of single droplets. For these investigations, the fluorescence dye Eosin-Y is dissolved in water and ethanol, which are typical solvents and working fluids in bio-medical applications and power engineering. A photo-physical characterization of the mixtures under various conditions was conducted using a spectrometric LIF setup and a micro cell. For ethanol, a small temperature dependency of the Eosin-Y LIF signal is observed up to 373 K. Photo-dissociation of Eosin-Y is negligible for solution in ethanol while it is distinct in water. The LIF signals of the single droplets are studied with an acoustic levitator. Effects of droplet evaporation, droplet deformation and varying dye concentration on the LIF-signal are studied. The single droplet measurements revealed a complex change of the fluorescence signal with reduced droplet size. This is due to droplet deformations leading to variations in the internal illumination field as well as dye enrichment during evaporation.

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Section: Methodsmentioning

confidence: 99%

Fluorescence Spectroscopy for Studying Evaporating Droplets Using the Dye Eosin-Y

Koegl

Weiß

Zigan

2020

Sensors

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“…Eosin-Y (C 20 H 6 Br 4 Na 2 O 5 , Sigma Aldrich; 5 wt% dissolved in H 2 O), which is known for its a good solubility in water and water-based solutions, is used for the measurements. The fluorescent tracer is a solid acid xanthene (natural ionic) tracer and is widely used for research applications (biology [56], medicine [57], groundwater migration tracer [58], planar droplet sizing for alcohol and water sprays [6,15,59,60]). Eosin-Y is only soluble in polar solvents and thus not in oils or fuels like alkanes e.g.…”

Section: Coolants and Dyes Usedmentioning

confidence: 99%

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Koegl,

Glahn,

Zigan

2024

Meas. Sci. Technol.

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This study investigates a two-colour LIF (laser-induced fluorescence) technique for thermometry in cooling lubricants (CL) for machining. The diagnostic technique should enable a simultaneous determination of cooling film thickness and film temperature, which is relevant for typical machining processes like turning and milling processes. The temperature determination is based on a temperature-sensitive fluorescence intensity ratio of a special dye determined in suitable spectral regions representing common band pass filters. For this purpose, two cooling lubricant emulsions CL6 (6 vol.% CL, 94 vol.% water; normal machining) and CL10 (10 vol.% CL, 90 vol.% water; heavy machining) and its individual components were doped with the fluorescence dye Eosin-Y. Temperature dependent spectral LIF intensities were recorded in the range of 273–313 K, which are relevant for milling and cutting operations. Furthermore, absorption spectra were analysed as well. The temperature-dependent fluorescence measurements revealed a temperature limit for the emulsion stability. The emission peaks of Eosin-Y are shifted with increasing temperature towards longer wavelengths. The sensitivities of CL10 (1.88%/K) and CL6 (1.58%/K) are comparable to or even higher than the sensitivities of other LIF dyes provided in the literature. The literature-based dyes were however not determined in those cooling lubricants. The measurements showed, that the investigated tracer-cooling lubricant/water emulsions mixed with the dye enable a reliable temperature determination.

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“…Eosin-Y (C 20 H 6 Br 4 Na 2 O 5 , Sigma Aldrich; here a solution of 5 wt% in H 2 O was utilized) is a solid acid xanthene (natural ionic) tracer; in addition to uses in medicine [92], biology [93], and as groundwater migration tracer [94], it is also used for planar droplet sizing for alcohol and water sprays [19][20][21]95]. Eosin-Y is not soluble in alkanes and, e.g., gasoline [90].…”

Section: Coolants and Tracers Usedmentioning

confidence: 99%

Characterization of Fluorescence Tracers for Thermometry and Film Thickness Measurements in Liquid Coolants Relevant for Thermal Management of Electric and Electronic Components

Koegl

Delwig

Zigan

2022

Sensors

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This study investigated a novel two-color LIF (laser-induced fluorescence) technique for thermometry in coolants relevant for electric components. In principle, this diagnostic enables thermometry in liquid flows but also a simultaneous determination of film thickness and film temperature, which is relevant, e.g., for jet impingement cooled electric components. Temperature measurements are based on a temperature-sensitive intensity ratio of special tracers realized by suitable band pass filters within the respective emission spectra. For this purpose, the heat transfer fluids Fragoltherm F12, Marlotherm LH, and a water–glycol mixture WG20 (80 vol.% water, 20 vol.% glycol) and its individual components were doped with suitable tracers. The tracer Eosin-Y was utilized for polar coolants (water, WG20, and glycol) and Nile red was utilized for non-polar solvents (Fragoltherm F12 and Marlotherm LH). The spectral LIF intensities were recorded for a wide range of temperatures (253–393 K), which are relevant for cooling of electric motors, batteries, and power electronics. Furthermore, absorption spectra were analyzed as well. The temperature-dependent fluorescence measurements revealed different behavior for the polar and non-polar solvents. A temperature increase in the polar solvents (water, WG20, glycol) led to a spectral shift of the emission peaks of Eosin-Y towards longer wavelengths (red-shifted), while the peaks of Nile red in the non-polar solvents (Fragoltherm F12 and Marlotherm LH) showed an opposite behavior and were blue-shifted. The highest average temperature sensitivity was achieved for Marlotherm LH (4.22%/K), followed by glycol (1.99%/K), WG20 (1.80%/K), water (1.62%/K), and Fragoltherm F12 (1.12%/K). These sensitivities are similar to or even much higher than the literature data of other LIF tracers, which were, however, not determined in those coolants. Consequently, the two novel proposed dyes for the studied heat transfer liquids enable a reliable temperature determination.

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Determining eosin as a groundwater migration tracer by capillary electrophoresis/laser‐induced fluorescence using a multiwavelength laser

Cited by 9 publications

References 12 publications

Fluorescence Spectroscopy for Studying Evaporating Droplets Using the Dye Eosin-Y

Fluorescence Spectroscopy for Studying Evaporating Droplets Using the Dye Eosin-Y

A novel laser-induced fluorescence concept for thermometry measurements in machining lubricoolants

Characterization of Fluorescence Tracers for Thermometry and Film Thickness Measurements in Liquid Coolants Relevant for Thermal Management of Electric and Electronic Components

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