Ionic-strength and pH dependent reactivities of ascorbic acid toward ozone in aqueous micro-droplets studied using aerosol optical tweezers

Chang, Yuan‐Pin; Wu, Shan-Jung; Lin, Min-Sian; Chiang, Che-Yu; Huang, Genin Gary

doi:10.1039/d0cp06493a

Cited by 17 publications

(59 citation statements)

References 59 publications

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“…Recently, Chang et al. utilized aqueous ascorbic acid micro‐droplets as prototype bioaerosols to investigate the kinetics of their reactions with gaseous ozone by means of aerosol optical tweezers [22] . They found that the reactivities of ascorbic acid in aqueous aerosols toward ozone are significantly dependent on aerosol pH and ion strength, and high acidities could significantly reduce the reactivity of ascorbic acid toward ozone.…”

Section: Motivationmentioning

confidence: 99%

“…They found that the reactivities of ascorbic acid in aqueous aerosols toward ozone are significantly dependent on aerosol pH and ion strength, and high acidities could significantly reduce the reactivity of ascorbic acid toward ozone. These findings suggest that the enhanced acidity of airway lining fluids due to inhaled sulfur dioxide or acidic particular matters can suppress the antioxidant activity and cause more direct contacts of atmospheric oxidants to bio‐surfaces [22] . These ascorbic acid or uric acid aerosols can also be regarded as prototype bio aerosols, and these antioxidants actually could become to protect the pathogens inside bio‐aerosols against ozone from environments for a period of time.…”

Section: Motivationmentioning

confidence: 99%

“…These ascorbic acid or uric acid aerosols can also be regarded as prototype bio aerosols, and these antioxidants actually could become to protect the pathogens inside bio‐aerosols against ozone from environments for a period of time. As a result, the lifetime of pathogens in bio‐aerosols could also be correlated to the oxidation reaction kinetics of aerosols [22] …”

Section: Motivationmentioning

confidence: 99%

“…AOT coupled with time‐resolved spectroscopic means allows for elucidating the dedicated interplays between the kinetic, microphysical and thermodynamic properties of the heterogeneous/multiphase reactions of aerosols, such as the heterogeneous oxidation reactions of single aqueous inorganic/organic acid aerosol particles with gaseous ozone [22,43d,e,47] . Sullivan at al.…”

Section: Technique Backgroundmentioning

confidence: 99%

“…Very recently, Chang et al. utilized hydrogen phosphate/dihydrogen phosphate to maintain the pH of single micro‐droplets at around 6, and they also used the Raman intensities of phosphates to monitor the aerosol pH over a range of about 5.5 to 7.3, during the reaction of aqueous ascorbic acid micro‐droplets with gaseous ozone [22] . Figure 4 shows the Raman spectra of single aqueous ascorbic acid aerosol particle at pH≈6 before and after exposed to ozone.…”

Section: Technique Backgroundmentioning

confidence: 99%

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Micro‐droplet Trapping and Manipulation: Understanding Aerosol Better for a Healthier Environment

Chang

Devi

Chen

2021

Chemistry An Asian Journal

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Understanding the physicochemical properties and heterogeneous processes of aerosols is key not only to elucidate the impacts of aerosols on the atmosphere and humans but also to exploit their further applications, especially for a healthier environment. Experiments that allow for spatially control of single aerosol particles and investigations on the fundamental properties and heterogeneous chemistry at the single‐particle level have flourished during the last few decades, and significant breakthroughs in recent years promise better control and novel applications aimed at resolving key issues in aerosol science. Here we propose graphene oxide (GO) aerosols as prototype aerosols containing polycyclic aromatic hydrocarbons, and GO can behave as two‐dimensional surfactants which could modify the interfacial properties of aerosols. We describe the techniques of trapping single particles and furthermore the current status of the optical spectroscopy and chemistry of GO. The current applications of these single‐particle trapping techniques are summarized and interesting future applications of GO aerosols are discussed.

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Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Technique Backgroundmentioning

confidence: 99%

Section: Technique Backgroundmentioning

confidence: 99%

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Micro‐droplet Trapping and Manipulation: Understanding Aerosol Better for a Healthier Environment

Chang

Devi

Chen

2021

Chemistry An Asian Journal

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Ozone oxidation of cysteine in optically trapped aqueous micro‐droplets

Chang

2023

J Chinese Chemical Soc

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The ozone (O3) oxidation kinetics of cysteine in aqueous micro‐droplets at different acidities is investigated in this study via aerosol optical tweezers coupled with Raman spectroscopy. This study exploits the O3 oxidation of cysteine near the interface of micro‐droplets as a model system to elucidate the oxidation damage of amino acids in biosurfaces. For each optically trapped micro‐droplet, Raman spectroscopy is used to determine its droplet radius, concentrations of solutes, and droplet pH, as well as their time evolutions during the kinetics measurements. The bimolecular rate coefficients of the cysteine + O3 reaction measured in micro‐droplets are around 4 × 105 M−1 s−1 and 2 × 104 M−1 s−1 for pH ≈ 5 and 0.5, respectively. These results agree with the previous bulk measurements, indicating that the observed aerosol kinetics can be solely rationalized via diffusion‐limited kinetics. The results also indicate that a high‐ionic strength could enhance the cysteine + O3 reaction, particularly for the zwitterion form of cysteine. The results imply that when surfactant proteins in lung fluids are exposed to ambient O3, the cysteine residues in proteins will be attacked by O3 at first due to the high reactivity of the thiol moiety in cysteine.

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Response of tropical trees to elevated Ozone: a Free Air Ozone Enrichment study

Jamal

Narayan

Dubey

et al. 2022

Environ Monit Assess

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Ionic-strength and pH dependent reactivities of ascorbic acid toward ozone in aqueous micro-droplets studied using aerosol optical tweezers

Abstract: The heterogeneous oxidation reaction of single aqueous ascorbic acid (AH2) aerosol particles with gas-phase ozone was investigated in this study utilizing aerosol optical tweezers with Raman spectroscopy. The measured liquid-phase...

Cited by 17 publications

References 59 publications

Micro‐droplet Trapping and Manipulation: Understanding Aerosol Better for a Healthier Environment

Micro‐droplet Trapping and Manipulation: Understanding Aerosol Better for a Healthier Environment

Ozone oxidation of cysteine in optically trapped aqueous micro‐droplets

Response of tropical trees to elevated Ozone: a Free Air Ozone Enrichment study

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