ArticleProceedings of the National Academy of Sciences of the United States of America2023
Imaging of pH distribution inside individual microdroplet by stimulated Raman microscopy.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.
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Who cites it
18 citing papers in PubMed.
- Rapid spontaneous generation of organosulfur from inorganic sulfur in atmospheric microdroplets.Nature communications · 2026Article
- Size-Dependent Reaction Pathways in Multiphase SOEnvironmental science & technology letters · 2026Article
- Evolution of the Composition and pH of Single Aqueous Aerosols Produced from Bulk Aqueous Sulfite Solutions.The journal of physical chemistry. A · 2026Article
- Ambient ammonia synthesis from air via tandem water microdroplets-driven oxidation and pulsed photoelectrochemical reduction.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Influence of Carbon Dioxide and pH on Influenza Virus in Sessile Saliva Droplets.Environmental science & technology · 2026Article
- Electric fields at hydrophobic water interfaces: spectroscopic evidence, physical origin, and implications on reactivity.Chemical Society reviews · 2026Review
- Recent Advances in Reactive Microdroplets for Clean Water and Energy.Advanced materials (Deerfield Beach, Fla.) · 2025Review
- Distinct Oligomerization of Lactic Acid in Aqueous Microdroplets.The journal of physical chemistry. A · 2025Article
- Oil-water interfaces drive gold precipitation via microdroplet chemistry in thermal geological systems.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Substantially improved efficiency and selectivity of carbon dioxide reduction by superior hydrated electron in microdroplet.Science advances · 2025Article
- Mechanisms of ionization and of chemical reactions in charged microdroplets.Chemical science · 2025Review
- Size Dependent Uncatalyzed Sulfite Oxidation in Aqueous Microdroplets.Environmental science & technology · 2025Article
- Lithium extraction by extractant confined in Pickering emulsion.Nature communications · 2025Article
- Catalyst-free Ullmann coupling in aqueous microdroplets.Nature communications · 2025Article
- Surface-Enhanced Raman Spectroscopy (SERS) Based Biological and Environmental 2D and 3D Imaging.ACS environmental Au · 2025Review
- Harnessing air-water interface to generate interfacial ROS for ultrafast environmental remediation.Nature communications · 2024Article
- Reaction acceleration at the surface of a levitated droplet by vapor dosing from a partner droplet.Chemical science · 2024Article
- Double-Layer Distribution of Hydronium and Hydroxide Ions in the Air-Water Interface.ACS physical chemistry Au · 2024Article
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Authors and funding
19 authors.
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Abstract
Aerosol microdroplets as microreactors for many important atmospheric reactions are ubiquitous in the atmosphere. pH largely regulates the chemical processes within them; however, how pH and chemical species spatially distribute within an atmospheric microdroplet is still under intense debate. The challenge is to measure pH distribution within a tiny volume without affecting the chemical species distribution. We demonstrate a method based on stimulated Raman scattering microscopy to visualize the three-dimensional pH distribution inside single microdroplets of varying sizes. We find that the surface of all microdroplets is more acidic, and a monotonic trend of pH decreasing is observed in the 2.9-μm aerosol microdroplet from center to edge, which is well supported by molecular dynamics simulation. However, bigger cloud microdroplet differs from small aerosol for pH distribution. This size-dependent pH distribution in microdroplets can be related to the surface-to-volume ratio. This work presents noncontact measurement and chemical imaging of pH distribution in microdroplets, filling the gap in our understanding of spatial pH in atmospheric aerosol.
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