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Accelerated Chlorination at the Air-Organic Interface Revealed by Molecular Simulations and Kinetic Modeling.
Liron Cohen1,2, Amro Dodin1,2, Kevin R Wilson1
1Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
Reactions accelerate at nonpolar air-organic interfaces, not just air-water interfaces. This finding, driven by faster surface diffusion and "tail spearfishing," impacts understanding of atmospheric aerosols and biological cells.
Area of Science:
- Chemical kinetics
- Surface chemistry
- Atmospheric chemistry
Background:
- Interfaces present unique chemical environments influencing reaction rates.
- Air-water interfaces accelerate reactions due to electrostatic gradients.
- Nonpolar air-organic interfaces are crucial for atmospheric aerosols, membranes, and cells.
Purpose of the Study:
- Investigate reaction acceleration at nonpolar air-organic interfaces.
- Determine mechanisms behind enhanced reactivity at these interfaces.
- Interpret anomalous reaction kinetics observed in aerosol experiments.
Main Methods:
- Molecular dynamics simulations.
- Coarse-grained kinetic modeling.
- Analysis of chlorine gas uptake at the air/squalene interface.
Main Results:
- Chlorine addition to squalene at the air-organic interface is over 10x faster than in the bulk.
- Surface diffusion of chlorine is significantly faster.
- A 'tail spearfishing' mechanism enhances reactant encounter probability.
Conclusions:
- Nonpolar air-organic interfaces can significantly accelerate chemical reactions.
- Surface dynamics and collective effects drive this acceleration.
- Findings advance understanding of interfacial reactivity in environmental and biological systems.
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