Journal
ANALYTICAL CHEMISTRY
Volume 80, Issue 22, Pages 8592-8597Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac801473f
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Funding
- Department of Energy-BES [DE-FG-04ER-15524]
- Robert A. Welch Foundation
- Direct For Biological Sciences
- Div Of Biological Infrastructure [0821700] Funding Source: National Science Foundation
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Laser desorption ionization (LDI) and ion mobility mass spectrometry (IM-MS) are applied to study molecular weight distribution and cross sections of petroleum asphaltene (ASPH) and deasphaltened oils (DAO). Ion mobility data confirmed the presence of gas-phase aggregation in LDI experiments. Most of the molecules with MW > 3000 g/mol in LDI result from gas-phase aggregation. Two-dimensional (2D) IM-MS trend lines are compared with model polymer systems to confirm the order of cross sections (polywax > polystyrene >> DAO > ASPH >> fullerenes), and these data illustrate that ASPH has a more condensed average structure than DAO.
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