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Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Fluid Mosaic Model

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Related Experiment Video

Updated: May 11, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Dynamical simulation of dipolar Janus colloids: dynamical properties.

Matthew C Hagy¹, Rigoberto Hernandez

¹Center for Computational and Molecular Science and Technology, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.

The Journal of Chemical Physics

|May 17, 2013

Summary

Simulations reveal coarse-grained models accelerate dynamics of dipolar Janus particles. Adjustments improve diffusion but not bond durations, indicating a need for new coarse-graining methods.

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Published on: December 4, 2017

Area of Science:

Computational physics
Soft matter physics
Chemical physics

Background:

Dipolar Janus particles exhibit complex dynamical properties.
Coarse-grained (CG) models offer computational efficiency but may alter dynamics.
Accurate simulation of particle dynamics is crucial for understanding material behavior.

Purpose of the Study:

To compare the dynamical properties of dipolar Janus particles using detailed pointwise (PW) and coarse-grained (CG) models.
To investigate methods for reconciling the dynamics between PW and CG models.
To identify limitations of current coarse-graining approaches for these systems.

Main Methods:

Molecular dynamics simulations using both detailed pointwise (PW) and coarse-grained (CG) models.
Analysis of static equilibrium properties and dynamical characteristics (diffusion, velocity autocorrelation, mean squared displacement, reversible bond durations).
Exploration of time rescaling and Langevin friction for dynamic mapping.

Main Results:

The CG model shows accelerated dynamics compared to the PW model, despite similar static properties.
Time rescaling and Langevin friction successfully mapped diffusion constants and improved other dynamical measures in the CG model.
Neither method corrected the distribution of reversible bond durations in the CG model, which lacked longer-duration bonds seen in the PW model.

Conclusions:

Coarse-grained models can accelerate dynamics, leading to discrepancies in transport properties like diffusion and bond dynamics.
Current time-mapping techniques are insufficient to fully capture the dynamics of dipolar Janus particles in CG models.
Development of advanced coarse-graining methods is necessary for accurate dynamical simulations of such systems.