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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Towards in situ fluorescence spectroscopy and microscopy investigations of asphaltene precipitation kinetics

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Author(s):
Franco, Juliana C. [1] ; Goncalves, Grasiele [1] ; Souza, Monique S. [1] ; Rosa, Samantha B. C. [1] ; Thiegue, Larissa M. [1] ; Atvars, Teresa D. Z. [1] ; Rosa, Paulo T. V. [1] ; Nome, Rene A. [1]
Total Authors: 8
Affiliation:
[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Optics Express; v. 21, n. 25, p. 30874-30885, DEC 16 2013.
Web of Science Citations: 6
Abstract

We perform a spectroscopic analysis of asphaltene in solution and in crude oil with the goal of designing an optical probe of asphaltene precipitation inside high-pressure cells. Quantitative analysis of steady-state spectroscopic data is employed to identify fluorescence and Raman contributions to the observed signals. Time-resolved fluorescence spectroscopy indicates that fluorescence lifetime can be used as a spectroscopic probe of asphaltene in crude oil. Quantitative confocal laser-scanning microscopy studies of asphaltene in n-heptane are used to calculate particle-size distributions as a function of time, both at the sample surface and asphaltene interior. The resulting precipitation kinetics is well described by stochastic numerical simulations of diffusion-limited aggregation. Based on these results, we present the design and construction of an apparatus to optically probe the in situ precipitation of asphaltene suitable for studies inside high pressure cells. Design considerations include the use of a spatial light modulator for aberration correction in microscopy measurements, together with the design of epi-fluorescence spectrometer, both fiber-based and for remote sensing fluorescence spectroscopy. (C) 2013 Optical Society of America (AU)

FAPESP's process: 12/15018-0 - In situ optical fiber-based characterization of asphalthene precipitation in crude oils
Grantee:Samantha Bittencourt Carvalho Rosa
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 08/10593-0 - Ultrafast spectroscopy measurements of chemical dynamics of liquids
Grantee:René Alfonso Nome Silva
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 12/14987-9 - Controlling the phase of light to enable observation of the onset of asphalthene precipitation in crude oils
Grantee:Larissa Mendonça Thiegue
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 11/20144-1 - Spectroscopic characterization of the onset of asphaltene precipitation em crude oils enriched with carbon dioxide or natural gas
Grantee:Juliana Crotti Franco
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 11/20143-5 - Advanced optical microscopies applied to the study of the onset of asphaltene precipitation in crude oil enriched with natural gas or carbon dioxide
Grantee:Grasiele Gonçalves
Support type: Scholarships in Brazil - Scientific Initiation