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A dissipative particle dynamics model for studying dynamic phenomena in colloidal rod suspensions
Yawei Liu1, Asaph Widmer-Cooper1
1ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia.
The Journal of Chemical Physics
|March 16, 2021
Summary
A new dissipative particle dynamics (DPD) model accurately simulates colloidal rod suspension dynamics. This model shows good agreement with theoretical predictions and experimental data for nanorod diffusion.
Area of Science:
- Computational physics
- Soft matter physics
- Colloid science
Background:
- Colloidal suspensions exhibit complex dynamics influenced by particle shape and solvent interactions.
- Accurate modeling of these dynamics is crucial for understanding and predicting material properties.
Purpose of the Study:
- To develop and validate a dissipative particle dynamics (DPD) model for simulating colloidal rod suspensions.
- To investigate the translational and rotational diffusion of single colloids within this DPD model.
Main Methods:
- Representing rods as linear chains of overlapping spheres interacting with DPD solvent particles.
- Implementing surface friction to control rod-solute boundary conditions.
- Comparing simulation results with theoretical predictions and experimental data.
Main Results:
- The DPD model accurately predicts translational and rotational diffusion coefficients for colloidal rods.
- Results show good agreement with theoretical calculations based on rod size.
- System-size dependence confirms the inclusion of Navier-Stokes hydrodynamic interactions.
Conclusions:
- The developed DPD model is a reliable tool for studying dynamics in colloidal rod suspensions.
- The model accurately captures hydrodynamic interactions and predicts diffusion coefficients.
- This work provides a foundation for extending DPD to more complex colloidal systems and particle types.
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