On the formation of hydrogen peroxide in water microdroplets

@article{Gallo2022OnTF,
  title={On the formation of hydrogen peroxide in water microdroplets},
  author={Adair Gallo and Nayara H. Musskopf and Xinlei Liu and Zi Yang and Jeferson Petry and Peng Zhang and Sigurdur T. Thoroddsen and Hong G. Im and Himanshu Mishra},
  journal={Chemical Science},
  year={2022},
  volume={13},
  pages={2574 - 2583}
}
Recent reports on the formation of hydrogen peroxide (H2O2) in water microdroplets produced via pneumatic spraying or capillary condensation have garnered significant attention. How covalent bonds in water could break under such mild conditions challenges our textbook understanding of physical chemistry and water. While there is no definitive answer, it has been speculated that ultrahigh electric fields at the air–water interface are responsible for this chemical transformation. Here, we report… 

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References

SHOWING 1-10 OF 64 REFERENCES
Spontaneous generation of hydrogen peroxide from aqueous microdroplets
TLDR
It is shown that pure water microdroplets directly generate H2O2 without help from O2 either in air surrounding the droplet or dissolved in water, and suggests that hydroxyl radical (OH) recombination is the most likely source.
Condensing water vapor to droplets generates hydrogen peroxide
TLDR
It is reported that H2O2 is spontaneously produced in water microdroplets formed by dropwise condensation of water vapor on low-temperature substrates, suggesting that spontaneous water oxidation to form H1O2 from water micro droplets is a general phenomenon.
Transport of Gaseous Hydrogen Peroxide and Ozone into Bulk Water vs. Electrosprayed Aerosol
Production and transport of reactive species through plasma–liquid interactions play a significant role in multiple applications in biomedicine, environment, and agriculture. Experimental
The air-water interface of condensed water microdroplets does not produce H$_2$O$_2$
Recent reports on the production of hydrogen peroxide (H$_2$O$_2$) on the surface of condensed water microdroplets without the addition of catalysts or additives have sparked significant interest.
Effect of relative humidity on hydrogen peroxide production in water droplets
Abstract A plot of H2O2 concentration as a function of %RH in the laboratory during the generation of mist using Biograde water. Each point represents a single measurement. Abstract Mist is generated
The reducing role of hydrogen peroxide on the formation of gold nanostructures in aqueous microdroplets with dissolved tetrachloroaurate ions
dissolved tetrachloroaurate ions (AuCl4 ). The authors suggested three possible electron donors for the reduction of AuCl4 , including the strong electric field at the microdroplet’s surface, the
Micrometer-Sized Water Droplets Induce Spontaneous Reduction.
TLDR
Results show that microdroplets provide a new foundation for green chemistry by rendering water molecules to be highly electrochemically active without any added reducing agent or applied potential.
Atmospheric pressure plasma activation of water droplets
Low temperature plasma treatment of water is being investigated due to its use in pollution abatement, wound treatment and agriculture. Plasma produced reactive oxygen and nitrogen species (RONS) are
Free radical generation by ultrasound in aqueous and nonaqueous solutions.
TLDR
Evidence to support theoretical predictions of transient cavitation and the use of spin trapping and electron spin resonance to identify hydrogen atoms and hydroxyl radicals conclusively is presented with particular emphasis on sonoluminescence which provides some non-chemical evidence for the formation of free radicals.
The chemical reactions in electrosprays of water do not always correspond to those at the pristine air–water interface
TLDR
Electrospray ionization mass spectrometry, proton nuclear magnetic resonance, ab initio calculations and molecular dynamics simulations found that the oligomerization of isoprene in aqueous electrosprays involved minimally hydrated and highly reactive hydronium ions.
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