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Active diffusion limited reactions.

Tanwi Debnath1, Pulak K Ghosh2, Yunyun Li3

  • 1Department of Chemistry, University of Calcutta, Kolkata 700009, India.

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|April 22, 2019
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Increasing self-propulsion in active Janus particles accelerates diffusion-limited reactions A + A → 0 and A + B → 0. This finding is relevant for applications like smart drug delivery systems.

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Area of Science:

  • Chemical kinetics
  • Statistical physics
  • Soft matter

Background:

  • Diffusion-limited reactions are fundamental in chemical processes.
  • Active Janus particles exhibit self-propulsion, influencing reaction dynamics.
  • Understanding reaction kinetics in various dimensions is crucial for theoretical and applied science.

Purpose of the Study:

  • To investigate the impact of self-propulsion on diffusion-limited annihilation reactions.
  • To analyze one- and two-dimensional reaction systems involving active and passive particles.
  • To explore potential applications in areas such as smart drug delivery.

Main Methods:

  • Theoretical modeling of diffusion-limited reactions.
  • Simulation of active Janus particles in one and two dimensions.
  • Analysis of reactant density decay under varying self-propulsion parameters.

Main Results:

  • Increased self-propulsion of active Janus particles leads to faster reactant density decay.
  • Both transient and asymptotic density decays follow power laws.
  • The exponents of these power laws are dependent on the reaction type and dimensionality.

Conclusions:

  • Self-propulsion is a key factor in controlling reaction rates for active particles.
  • The observed power-law behaviors provide insights into the fundamental mechanisms of these reactions.
  • Findings have implications for designing advanced chemical systems and drug delivery technologies.