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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Controlling the reverse thermodiffusion in dumbbell-shaped active particle systems.

Yingling Peng1, Weirong Zhong1

  • 1Department of Physics, College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou 510632, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 18, 2025
PubMed
Summary

Active particles can move against temperature gradients, from cold to hot regions, a phenomenon known as reverse thermodiffusion (RTD). This behavior is more pronounced at lower average temperatures and is influenced by particle shape.

Keywords:
active particlesdumbbell structuremass transportmolecular dynamicsnonequilibrium statistical mechanicsthermodiffusion

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Area of Science:

  • Statistical Mechanics
  • Active Matter Physics
  • Computational Physics

Background:

  • Anomalous transport in active particles under temperature gradients challenges classical physics.
  • Understanding thermodiffusion is crucial for controlling active particle transport.

Purpose of the Study:

  • Investigate mass transport of dumbbell-shaped active particles in a temperature gradient.
  • Explore the phenomenon of reverse thermodiffusion (RTD).

Main Methods:

  • Molecular dynamics simulations.
  • System with a defined temperature difference.

Main Results:

  • Active particles exhibit reverse thermodiffusion (RTD) from low to high temperatures when self-propulsion is strong.
  • RTD is more likely at lower average system temperatures.
  • Particle asymmetry significantly impacts RTD behavior.

Conclusions:

  • Findings offer a theoretical basis for manipulating active particle transport under thermal gradients.
  • Establishes a foundation for applications in energy and drug delivery.