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Atmospheric Physical Chemistry Lab
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A lab that explores chemical reactions at the surfaces of tiny droplets in the atmosphere and at water interfaces.
AboutAbout the lab
Uncovering reactions at atmospheric and water interfaces at the molecular level.
The Atmospheric Physical Chemistry Lab studies physicochemical processes that occur in atmospheric aerosols (tiny droplets), cloud droplets, and on biological surfaces.
The lab investigates, at the molecular level, the mechanisms of chemical reactions at the boundary between gas and liquid (the air-liquid interface) and inside liquids.
The effects of air pollutants such as PM2.5 and ozone on the surfaces of the lungs and skin are also studied.
On the lab's website, it is introduced under the name "Enami Lab."
Key terms
- Aerosol
- Tiny droplets floating in the atmosphere. This lab studies the reactions that occur inside them and on their surfaces
- Air-liquid interface
- The boundary surface between a gas and a liquid. Some reactions at the air-water interface are more than a thousand times faster than in bulk water
- Hydroxyl radical
- A chemical species that causes oxidation reactions (the OH radical). It forms, for example, on the surface of lungs that have inhaled PM2.5, and oxidizes biomolecules
- Microheterogeneity
- A state in which a mixed liquid looks uniform overall but is uneven at the molecular level
NewsLab news
Result of collaborative research with the Hama Lab at the University of Tokyo published in PCCP
Paper with a lab member as first author published in J. Phys. Chem. A
A doctoral student received an Outstanding Student Presentation Award at JpGU-AGU2026
Collaborative research on the reaction of hydroperoxides with amines published in J. Phys. Chem. Lett.
Paper with a postdoctoral researcher as first author published in J. Phys. Chem. A
ResearchResearch themes
This lab aims to elucidate, at the molecular level, the physicochemical processes that occur on tiny droplets in the atmosphere, on biological surfaces, and at water interfaces. It takes a molecular-science approach toward solving the problems of global climate change and air pollution.
*Illustrative imageChemical reactions in multiphase atmospheric systems
The lab studies reactions in multiphase systems that include the gas phase, the liquid phase, and the air-liquid interface between them. It found that inside aerosols generated by forest fires, sugars react with hydroxyl radicals to form highly hydrophilic products such as hydroperoxides.
*Illustrative imageReactions of air pollutants on biological surfaces
The lab studies the mechanisms of reactions that air pollutants such as PM2.5 and ozone cause on biological surfaces such as the lungs and skin. Recently, it clarified the liquid-phase reaction mechanism between sapienic acid on the surface of human skin and hydroxyl radicals.
*Illustrative imageMolecular-level inhomogeneity in liquids
The lab studies molecular-level inhomogeneity (microheterogeneity) that arises in mixed solutions of water and hydrophilic solvents. It has demonstrated through direct detection that nanoscale droplets actually form within a liquid phase that looks uniform to the eye.
*Illustrative imageChemistry and physics of water interfaces
The lab investigates why unusual reactions occur at water interfaces. Interfacial acidity and ion behavior have been suggested as possible factors, and the lab is trying to get at the origin using mass spectrometry that makes use of the breakup of water droplets and multi-angle dynamic light scattering.
MembersFaculty
The members of the Atmospheric Physical Chemistry Lab are faculty and students in the doctoral, master's, and undergraduate programs.As of 2026
- ProfessorShinichi Enami
- Associate ProfessorYoshinobu Nishimura
- Assistant ProfessorNaoki Numadate
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Air pollution banner Smog in Warsaw” Radek Kołakowski from Warszawa, Poland / CC BY 2.0 (cropped)
- Chemical reactions in multiphase atmospheric systems: “Wildfire in Yellowstone National Park produces Pyrocumulus clouds1” Brocken Inaglory / CC BY-SA 3.0 (cropped)
- Reactions of air pollutants on biological surfaces: “Air Monitoring station, Reno, Nevada” brewbooks / CC BY-SA 2.0 (cropped)
- Molecular-level inhomogeneity in liquids: “Separatory funnel with oil and colored water” PRHaney / CC BY-SA 3.0 (cropped)
- Chemistry and physics of water interfaces: “Water ripple” Tlrmedia / CC BY-SA 4.0 (cropped)
- Related lab (分析化学): “Lasers; Optics ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (分光物理化学): “Silver Target in XPS Spectrometer” MichaelBueker / CC BY-SA 3.0 (cropped)
- Related lab (物性物理化学): “Crystals of Beta-alanine and Coca-Cola mixture under polarized light” Janeklass / CC BY 4.0 (cropped)
- Related lab (計算情報化学): “Model molecular àcid salicílic” Joel Gonzàlez / CC BY-SA 4.0 (cropped)
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