Exciplex Fluorescence Visualization Systems for Pre-Combustion Diagnosis of an Automotive Gasoline Engine

This paper reports the development of exciplex-based vapor/liquid visualization systems based on exciplexes formed from tertiary amines and fluorine-substituted benzene and/or toluene. These systems are expected to be virtually coevaporative with solvents (fuels) boiling in the temperature range 70 to 110°C and thus are expected to track the vaporization of automotive gasoline effectively. A system consisting of 10% triethylamine/0.5% fluorobenzene/89.5% hexane should be coevaporative with a normal boiling point of 69°C. A system consisting of 10% n-propyldiethylamine/0.5% 4-fluorotoluene/89.5% isooctane should be coevaporative with a normal boiling point of approximately 100°C. Although the coevaporation of these systems is excellent, the exciplexes revert to varying extents to excited monomer at temperatures near 100°C. Thus there is considerable cross talk from the liquid into the vapor spectral region. The tertiary amines generally require excitation at wavelengths below 250 nm; the fluorobenzene or 4-fluorotoluene can be excited at 266 nm. Monomer emission peaks at 290 nm; exciplex emission peaks at 350 nm.

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Energy efficiency of automotive gasoline engine: current approaches

Trudy NAMI ◽

10.51187/0135-3152-2020-4-109-122 ◽

2020 ◽

pp. 109-122

Author(s):

V.I. Sonkin

Keyword(s):

Energy Efficiency ◽

Gasoline Engine ◽

Automotive Gasoline

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Determination of Bearing Oil Film Thickness (BOFT) for Various Engine Oils in an Automotive Gasoline Engine Using Capacitance Measurements and Analytical Predictions

10.4271/982661 ◽

1998 ◽

Cited By ~ 4

Author(s):

Spyros I. Tseregounis ◽

Michael B. Viola ◽

Rohit S. Paranjpe

Keyword(s):

Film Thickness ◽

Gasoline Engine ◽

Automotive Gasoline ◽

Oil Film ◽

Engine Oils ◽

Capacitance Measurements

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Absolute Quantum Yields for Exciplex Fluorescence

Applied Spectroscopy ◽

10.1366/0003702904085895 ◽

1990 ◽

Vol 44 (1) ◽

pp. 101-105 ◽

Cited By ~ 14

Author(s):

S. J. Hale ◽

L. A. Melton

Keyword(s):

Quantum Yield ◽

Temperature Dependence ◽

Room Temperature ◽

Quantum Yields ◽

Absolute Quantum Yield ◽

The Absolute ◽

Visualization Systems ◽

Methyl Naphthalene ◽

Absolute Quantum ◽

Exciplex Fluorescence

The absolute quantum yields for exciplex fluorescence in four solutions which have potential as exciplex-based vapor/liquid visualization systems have been measured. The room-temperature absolute quantum yields for 10% dibutyl-aniline/0.4%, 1-cyanonaphthalene, 12.5% 1-methyl-naphthalene/0.5% N,N,N′,N′-tetramethyl- p-phenylenediamine (TMPD), 10% trihexylamine/1.0% 1-cyanonaphthalene, and 10% naphthalene/1.0% TMPD in hexadecane or cyclohexane are 0.03 ± 0.005, 0.05 ± 0.002 (308 nm), 0.02 ± 0.001, and 0.16 ± 0.021, respectively. The temperature dependence of the absolute quantum yield for the 10% naphthalene/1% TMPD in the hexadecane system was measured over the range of 23 to 260°C and was found to decrease by 20–30% at 260°C.

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