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Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
Published on: May 31, 2022
Insight into asphaltene nanoaggregate structure inferred by small angle neutron and X-ray scattering.
Joëlle Eyssautier1, Pierre Levitz, Didier Espinat
1IFP Energies nouvelles, Rueil-Malmaison, France.
The Journal of Physical Chemistry. B
|May 11, 2011
Summary
Asphaltene nanostructure was detailed using neutron and X-ray scattering. Results reveal fractal aggregates with core-shell disks, supporting modified Yen models for petroleum science.
Area of Science:
- Petroleum Science
- Materials Science
- Physical Chemistry
Background:
- Asphaltenes are complex macromolecules found in petroleum.
- Understanding asphaltene nanostructure is crucial for refining and processing.
- Existing models like the Yen model provide a framework for asphaltene aggregation.
Purpose of the Study:
- To elucidate the nanostructure of asphaltenes in a toluene solution.
- To determine the dimensions and composition of asphaltene nanoaggregates.
- To validate and refine existing models of asphaltene organization.
Main Methods:
- Simultaneous small-angle neutron scattering (SANS) and X-ray scattering (SAXS) measurements.
- Absolute intensity scaling and neutron contrast variation experiments.
- Analysis of fractal organization and core-shell disk models.
Main Results:
- Asphaltenes form fractal nanoaggregates from smaller entities (16 kDa).
- Nanoaggregates exhibit a core-shell disk structure with specific dimensions (radius 32 Å, height 6.7 Å).
- The core is aromatic and dense, while the shell is aliphatic.
Conclusions:
- The study provides detailed structural and compositional information on asphaltene nanoaggregates.
- Findings align with and enhance the modified Yen model.
- The characterized dimensions are vital for understanding asphaltene behavior in solvents.
