Related Experiment Video
Updated: Jul 8, 2025
06:55
Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
Published on: September 26, 2016
7.9K
Active-parameter polydispersity in the 2d ABP Yukawa model
Shibu Saw1, Lorenzo Costigliola1, Jeppe C Dyre1
1Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, PO Box 260, DK-4000 Roskilde, Denmark.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 14, 2023
Summary
Introducing parameter polydispersity in active Brownian particles has minimal impact on structure and dynamics, except for swim velocity variations in phase-separated systems. This offers potential for efficient equilibration in active matter.
Area of Science:
- Soft matter physics
- Statistical mechanics
- Computational physics
Background:
- Particle size polydispersity is common in active matter studies.
- Active Brownian particles (ABPs) are a key model system.
- Motility-induced phase separation (MIPS) is a critical phenomenon in ABPs.
Purpose of the Study:
- Investigate the impact of polydispersity in parameters other than particle size.
- Examine the effects on structure and dynamics of two-dimensional ABPs.
- Explore uniform and binary distributions in homogeneous and MIPS phases.
Main Methods:
- Computational simulations of active Brownian particles.
- Yukawa pair interactions were employed.
- Polydispersity was introduced in translational diffusion, rotational diffusion, and swim velocity.
Main Results:
- Minimal changes in structure and dynamics were observed with up to 50% polydispersity.
- Swim velocity polydispersity showed significant variations in the radial distribution function during MIPS.
- Dynamics were only modestly affected even with swim velocity polydispersity.
Conclusions:
- Parameter polydispersity has a limited effect on ABP systems.
- Swim velocity polydispersity is an exception, influencing MIPS structure.
- Temporary polydispersity could aid equilibration in glass-forming active systems.
More Related Videos
Related Concept Videos
01:10Polymers: Molecular Weight Distribution
3.4K
For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
3.4K
01:24Van der Waals Interactions
64.0K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
64.0K
01:18First Law: Particles in Two-dimensional Equilibrium
5.1K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
Newton's first law tells us about...
5.1K
01:10First Law: Particles in One-dimensional Equilibrium
6.9K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
6.9K
02:00Molecular Models
38.4K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
38.4K
01:23Equilibrium Conditions for a Particle
1.2K
When an object is in equilibrium, it is either at rest or moving with a constant velocity. There are two types of equilibrium: static and dynamic. Static equilibrium occurs when an object is at rest, while dynamic equilibrium occurs when an object is moving with a constant velocity. In both cases, there must be a balance of forces acting on the object.
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
To understand the concept of equilibrium, let us first consider the forces acting on an object. When different forces act on an object, they can...
1.2K