Abstract
In part 1 of this series of papers, the results of electron spray ionization mass spectrometry (ESI-MS) and molecular dynamics (MD) simulation revealed a close relationhsip between nanoaggregation of polyaromatic (PA) compounds and their chemical structures. In this paper, we present the results of investigating the flocculation of fractionated asphaltenes and synthesized PA molecules by dynamic light scattering (DLS). Together, these two papers complement one another and draw a full picture of asphaltene aggregation. Three asphaltene fractions were obtained on the basis of their different adsorption characteristics onto calcium carbonate. The DLS results suggest that the irreversibly adsorbed (Irr-Ads) asphaltenes containing the highest number of polar groups are the fraction of asphaltenes responsible for the observed flocculation in whole asphaltenes. To better understand the aggregation behavior of asphaltenes, flocculation of three synthesized PA compounds, N-(1-hexylhepyl)-N′-(5-carboxypentyl)peryle...
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