2021
DOI: 10.1021/acs.est.0c07922
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Interparticle Delivery and Detection of Volatile Singlet Oxygen at Air/Solid Interfaces

Abstract: An interparticle system has been devised, allowing airborne singlet oxygen to transfer between particle surfaces. Singlet oxygen is photogenerated on a sensitizer particle, where it then travels through air to a second particle bearing an oxidizable compounda particulate-based approach with some similarities to reactive oxygen quenching in the atmosphere. In atmospheric photochemistry, singlet oxygen is generated by natural particulate matter, but its formation and quenching between particles has until now no… Show more

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Cited by 14 publications
(13 citation statements)
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“…On the other hand, extrapolating from our dilute, aqueous extracts to concentrated OA systems likely does not follow a linear scale but could reach a plateau at a maximum [ 1 O 2 ] SS given by the increasing competing strength of the chemical sinks. (2) The sensitization experiments were conducted in bulk solutions, influencing reaction kinetics and absorption behavior compared to faster reaction rates in droplets. It is also likely that 1 O 2 production is enhanced if the chromophore is at the surface of the OA. (3) Our extracts were not buffered and were thus at pH 6, potentially influencing the concentrations of protonated chromophores .…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, extrapolating from our dilute, aqueous extracts to concentrated OA systems likely does not follow a linear scale but could reach a plateau at a maximum [ 1 O 2 ] SS given by the increasing competing strength of the chemical sinks. (2) The sensitization experiments were conducted in bulk solutions, influencing reaction kinetics and absorption behavior compared to faster reaction rates in droplets. It is also likely that 1 O 2 production is enhanced if the chromophore is at the surface of the OA. (3) Our extracts were not buffered and were thus at pH 6, potentially influencing the concentrations of protonated chromophores .…”
Section: Resultsmentioning
confidence: 99%
“…Effect of the Chain Length on k T . With the advent of a technique to monitor the quenching of 1 O 2 at the air−D 2 O and air−solid interfaces, 16,51 the rate constants k T can show the removal of 1 O 2 by the surfactants. In the present k T experiments, the use of D 2 O was preferred because of a longer lifetime in D 2 O (τ Δ = 66 μs) than in H 2 O (τ Δ = 4.5 μs), 52 thereby facilitating the time-resolved measurements.…”
Section: ■ Results and Discussionmentioning
confidence: 99%
“…Previous studies have also examined 1 O 2 transfer in silicas, zeolites, supramolecular systems, and superhydrophobic surfaces. Flow reactors for 1 O 2 generation and reactions in water are emerging and show good potential, as well as surfactants in reactive oxygen species (ROS) reactions at the air–water interface. A study of Singleton et al on the reaction of cis- 2-butene and tetramethylethylene with 1 O 2 proposed a two-step no-intermediate pathway and laid the groundwork for potential bifurcations on the 1 O 2 reaction surface. The trans -cyclooctene/ 1 O 2 “ene” reaction is unique in that its allylic hydrogens are inaccessible so that a minimum develops on the potential energy surface (PES) for the perepoxide.…”
Section: Introductionmentioning
confidence: 99%
“…These values are slightly higher than those found for DMA, probably because this substrate reacts selectively with 1 O 2 . Interestingly, the total (physical + chemical) quenching rate constants ( k T ) of 1 O 2 by Trp and DMA are 7.1 × 10 7 and 9.44 × 10 7 M –1 s –1 , respectively, , suggesting that values for k obs should present similarities when the same surface is compared. Indeed, values are of the same order of magnitude, being in both surfaces, the rate constants, k obs DMA and k obs Trp , are 1 order of magnitude higher for ZnPc-PEDOT.…”
Section: Resultsmentioning
confidence: 99%