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Asphaltene Aggregation in Aqueous Solution Using Different Water Models: A Classical Molecular Dynamics Study.

Anoop Kishore Vatti1, Andrina Caratsch2, Shuvadeep Sarkar1

  • 1Department of Chemical Engineering, Manipal Institute of Technology (MIT), Manipal Academy of Higher Education (MAHE), Manipal, Karnataka 576104, India.

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This study reveals that the choice of water model significantly impacts the aggregation behavior of asphaltene nanoaggregates in aqueous solutions. Accurate molecular dynamics simulations require careful selection of water models for reliable results.

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Area of Science:

  • Petroleum Science
  • Materials Science
  • Computational Chemistry

Background:

  • Asphaltene aggregation in aqueous solutions is a critical phenomenon in petroleum science.
  • Understanding asphaltene nanoaggregate structure and dynamics is essential for process optimization and stability.
  • Classical molecular dynamics offers a powerful tool for investigating such complex systems.

Purpose of the Study:

  • To systematically investigate the aggregation behavior of asphaltene in aqueous solutions using molecular dynamics.
  • To explore the structural and dynamical properties of asphaltene nanoaggregates with different water models.
  • To evaluate the accuracy of various water models (SPC, TIP4P-D, TIP5P) for asphaltene aggregation studies.

Main Methods:

  • Classical molecular dynamics simulations were employed.
  • The end-to-end distance of asphaltene molecules was analyzed to understand aggregation.
  • Transport coefficients, including diffusion coefficient and shear viscosity, were computed to probe dynamical properties.
  • Three distinct water models (SPC, TIP4P-D, TIP5P) were utilized and compared.

Main Results:

  • The study systematically investigated asphaltene aggregation in aqueous solutions.
  • Different water models exhibited varying degrees of accuracy in predicting asphaltene nanoaggregate properties.
  • The end-to-end distance analysis provided insights into the aggregation mechanisms.
  • Computed transport coefficients revealed significant differences based on the water model used.

Conclusions:

  • The selection of an appropriate water model is crucial for accurately simulating asphaltene aggregation behavior.
  • Inaccurate water models can lead to erroneous predictions of asphaltene nanoaggregate structure and dynamics.
  • This research underscores the importance of water model selection in molecular dynamics studies of asphaltene systems.