Limitations of Size-Exclusion Chromatography in Analyzing Petroleum Asphaltenes: A Proof by Atomic Force Microscopy
作者： Mahtab Behrouzi , Paul F. Luckham
DOI: 10.1021/EF800064Q
关键词: Toluene 、 Gel permeation chromatography 、 Elution 、 Analytical chemistry 、 Chemistry 、 Porosity 、 Column chromatography 、 Size-exclusion chromatography 、 Polystyrene 、 Asphaltene
摘要: The analysis of a Maya asphaltene using size-exclusion chromatography (SEC) and 1-methyl-2-pyrrolidinone (NMP), tetrahydrofuran (THF), toluene as the eluent (separately used) showed radically different chromatograms. SEC fossil fuel hydrocarbons, e.g., asphaltenes, NMP has shown two-peak structure, which been source debate, whether peak excluded from column porosity (appearing at shorter retention times) contained asphaltenic aggregates or very large molecular masses thousands mass units. asphaltenes THF retained peaks longer times. In this work, atomic force microscopy (AFM), technique capable reliable accurate detection interaction forces between various molecules in media, was exploited to investigate polystyrene (PS) particles (SEC packing) air NMP. AFM strong PS ...
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