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The objective of this study is to determine the aromatic sheet diameter (La) and the number of aromatic sheets per stack (n) for asphaltene molecules from Raman spectra by investigating and optimizing empirical equations proposed in the literature for both crystalline and amorphous carbon materials. The results clearly indicated that the best empirical equation for determining the aromatic sheet diameter...
The main objective of this study is to determine the effect of thermal cracking on asphaltene molecular structure. Hence, n-heptane insoluble fractions were precipitated and collected from three different vacuum residues and their thermally decomposed products. The X-ray diffraction (XRD) analysis provided an understanding of the macro-structure of the asphaltene molecule and revealed the impact of...
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