Quantum Yields of Crude Oils

Ralston, Corie Y.; Wu, Xi; Mullins, Oliver C.

doi:10.1366/0003702963904601

Cited by 112 publications

(114 citation statements)

References 11 publications

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“…Crude oil fluorescence originates primarily from the aromatic hydrocarbons [31] and is mainly controlled by the concentration of these compounds in the oil, as well as by the concentration of compounds that can quench the fluorescence. Light crudes tend to have stronger and narrower fluorescence spectra, as compared to heavy crudes [32,33]. However, autofluorescence has no effect on the optical resonance structure of the WGM.…”

Section: Discussionmentioning

confidence: 97%

Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries

Zamora

Zhang

Meldrum

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-La de´tection re´fractome´trique des huiles lourdes dans les microcapillaires a`coeur fluorescents -La de´tection par re´fractome´trie d'huiles lourdes calibre´es (densite´> 1 000 kg/m 3 ) a e´te´de´montre´e à l'aide de micro-capillaires a`coeurs fluorescents. La surface interne d'un capillaire de 25 microns a d'abord e´te´reveˆtue d'une couche de silicium fluorescent a`haut indice de re´fraction (fluorescent silicon Quantum Dots, QD). Ce film de QD permet le de´veloppement de re´sonances cylindriques en mode galerie (Whispering Gallery Mode, WGM) à l'inte´rieur du capillaire. Les huiles lourdes recouvrant une gamme e´tendue de l'indice de re´fraction ont e´teí njecte´es dans le canal du capillaire, provoquant de grands changements pour les longueurs d'onde de re´sonance WGM. La sensibilite´des huiles lourdes aux indices de re´fraction les plus e´leve´s, est d'environ 250 nm par Unite´d'Indice de Re´fraction (nm/UIR), ce qui est la sensibilite´la plus e´leve´e observe´e jusqu'à pre´sent pour un capteur re´fractome´trique fonctionnant en mode fluorescent. Cela est une indication que les microcapillaires a`coeurs fluorescents pourraient eˆtre une alternative viable par microfluidique pour la de´tection chimique ou par re´fractome´trie lors des divers stades de la transformation, du controˆle et de l'utilisation du pe´trole et du gaz.Abstract -Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries -The refractometric sensing of calibrated heavy oils (density > 1 000 kg/m 3 ) is demonstrated using fluorescent-core microcapillaries. A 25-micron capillary channel was first coated with a high-index layer of fluorescent silicon Quantum Dots (QD). This QD film supports the development of cylindrical Whispering Gallery Mode (WGM) resonances inside the capillary. Heavy oils spanning a wide range of refractive index were pumped into the capillary channel, causing large shifts in the fluorescence WGM resonant wavelengths. The sensitivity for heavy oils approached 250 nm per Refractive Index Unit (nm/RIU) at the higher oil indices, which is the highest sensitivity so far observed for a refractometric sensor operating in the fluorescence mode. This suggests that fluorescent core microcapillaries may be a viable microfluidic alternative for refractometric or chemical sensing in various stages of oil and gas processing, monitoring and usage.

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Section: Discussionmentioning

confidence: 97%

Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries

Zamora

Zhang

Meldrum

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…Page 3 of 21 oils have narrower more intense emission bands, and longer lifetimes ( Figure 1) [7,8]. The nature of the emission is governed by the complex interplay between energy transfer and quenching caused by the high concentrations of fluorophores and quenchers in petroleum oils.…”

Section: Introductionmentioning

confidence: 99%

Frequency Domain Fluorescence Lifetime Study of Crude Petroleum Oils

2008

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Abstract:Frequency domain (FD) fluorescence lifetime data was collected for a series of 20 crude petroleum oils using a 405 nm excitation source and over a spectral range of ~426 to ~650 nm. Average fluorescence lifetimes were calculated using three different models: discrete multi-exponential, Gaussian distribution, and Lorentzian distribution. Fitting the data to extract accurate average lifetimes using the various models proved easier and less time consuming for the FD data than with Time Correlated Single Photon Counting (TCSPC) methods however the analysis of confidence intervals to the computed average lifetimes proved cumbersome for both methods. The uncertainty in the average lifetime was generally larger for the discrete lifetime multi-exponential model when compared to the distributionbased models. For the lifetime distributions, the data from the light crude oils with long lifetimes generally fit to a single decay term. Heavier oils with shorter lifetimes required This is the author version of the paper: Frequency Domain Fluorescence Lifetime Study of Crude Petroleum Oils. P. Owens, A.G. Ryder, and N.J.F. Blamey. Journal of Fluorescence, 18(5), 997-1006Fluorescence, 18(5), 997- , (2008. DOI: 10.1007/s10895-008-0330-5Page 2 of 21 multiple decay terms. The actual value for the average lifetime is more dependant on the exact fitting model employed than the data acquisition method used. Correlations between average fluorescence lifetimes and physical and chemical parameters of the crude oils were made with a view to developing a quantitative model for predicting the gross chemical composition of crude oils. It was found that there was no significant benefit gained by using FD over TCSPC other than more rapid data analysis in the FD case. For the FD data the Gaussian distribution model for fluorescence lifetime gave the best correlations with chemical composition allowing a qualitative correlation to some bulk oil parameters.

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“…Total Scanning Fluorescence (TSF) technique has been used to discriminate drilling additives from crude oils, and to quantify the API gravity (density) of crude oils [8]. In some laboratory-based studies, absolute quantum yields [9,10] and fluorescence emission spectra of various crude oils have been measured in the visible and the near infrared [9]. Results show the relative dependence of quenching rates on the excitation wavelengths and the chromophore interaction.…”

Section: Introductionmentioning

confidence: 99%

Quantitative techniques to discriminate petroleum oils using LED-induced fluorescence

V.Rostampour¹,

Lynch²

2006

WIT Transactions on Ecology and the Environment, Vol 95

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In-situ LED-induced fluorescence analysis of oils on water was performed by examining the fluorescence spectrum of various Australian crude oils and some refined oil products. Crude oils and other refined oil were discriminated using non-contact fluorescence-based techniques. The spectral distribution of the fluorescence emission, which contains obvious diagnostic potential, has been used as a quantitative technique to differentiate oil products. The key factors used in these quantitative techniques are; (i) spectral shape, (ii) the wavelength of maximum intensity and (iii) fluorescence spectral width. The first discriminating technique applied is the green-yellow quotient ( ). The dualwavelength excitation was employed in the laboratory to discriminate crude and refined oils. In this technique, oil slicks (on water) were exposed to two different excitation illumination wavelengths. All oil samples were illuminated by several UV and visible excitation sources. The four crude oils and other petroleum products were easily differentiated by applying the ratio of two fluorescence spectral bands excited by 528 nm and 405 nm. While theses techniques appear to be sensitive enough to discriminate different crude oils and other refined oil products in the non-contact fluorescence measurement, the selected excitation wavelength range chosen was not the optimum wavelength for fluorescence of crude oil. More studies need to be performed using additional crude oil samples and shorter excitation wavelengths.www.witpress.com, ISSN 1743-3541 (on-line)

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Quantum Yields of Crude Oils

Cited by 112 publications

References 11 publications

Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries

Refractometric Sensing of Heavy Oils in Fluorescent Core Microcapillaries

Frequency Domain Fluorescence Lifetime Study of Crude Petroleum Oils

Quantitative techniques to discriminate petroleum oils using LED-induced fluorescence

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