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Tomai Lab
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The lab creates nanomaterials and processes using supercritical fluids and electrochemistry.
AboutAbout the lab
Mastering materials and processes with supercritical fluids.
The Tomai Lab studies how to create materials and processes using supercritical fluids as reaction solvents.
The solvent properties of a supercritical fluid change greatly with only a slight change in temperature and pressure.
Taking advantage of this, the lab works on biomass conversion, chemical recycling, organic synthesis, and the synthesis of nanoparticles and catalysts.
The lab also studies substance conversion by electrochemistry, aiming to create new scientific principles for a sustainable society.
Key terms
- Supercritical fluid
- A substance whose temperature and pressure are beyond the critical point. It behaves like something between a gas and a liquid
- Electrocatalyst
- A material that helps reactions driven by electricity proceed more easily. It is used for the electrolysis of water and carbon dioxide
- Machine learning
- A method in which a computer finds rules in large amounts of data and uses them for prediction
NewsLab news
A master's student won the Student Presentation Award at the 57th Autumn Meeting of the Society of Chemical Engineers, Japan
A master's student won a Poster Award at Supergreen 2026, an international conference in the field of supercritical fluids
A co-authored paper was published in Chemical Science
A paper was published in ACS Catalysis, revealing a new principle for controlling products with pressure
Associate Professor Iwase won the Progress Award (Sano Award) of the Electrochemical Society of Japan
ResearchResearch themes
A distinguishing feature of the lab's research is that it uses supercritical fluids as reaction solvents to control both materials and processes. By incorporating electrochemistry, the lab aims to control nanomaterials more finely and to realize processes that help build a carbon-cycle society.
*Illustrative imageUnderstanding Interfaces to Control Structure
In the supercritical state, the properties of a solvent can be changed greatly by slightly adjusting temperature and pressure. By manipulating solvent properties and the surface state of materials, the lab controls the interaction between a material and its medium, and works on control across multiple length scales, from surface composition and structure to porous structures formed by the dispersion and aggregation of nanoparticles.
*Illustrative imageElectrocatalysts of Inorganic Nanomaterials
In an electrocatalyst, the electronic state and coordination of the metal active center are key factors that determine its catalytic function. The lab develops new synthesis processes for nanomaterials and creates highly active electrocatalysts that can be used for water electrolysis and carbon dioxide electrolysis.
*Illustrative imageElectrochemistry of High-Temperature, High-Pressure Fluids
Under high temperature and high pressure, water and gases, and water and organic substances (such as waste plastics and biomass), which normally separate, become a single phase. The lab works on electrochemical conversion of substances (such as the reduction of carbon dioxide) using such fluids, and is building the scientific foundation of high-temperature, high-pressure electrochemistry.
*Illustrative imageControlling Particle Size with Data Science
In materials development, slight differences in synthesis conditions can affect how crystals grow and how large the particles are, and it can be difficult to obtain the intended material reproducibly. The lab systematizes data on synthesis conditions and particle sizes scattered across the literature, and by combining prediction by machine learning with verification by automated synthesis, it is developing guidelines for designing particle size as intended.
MembersFaculty
The members of the Tomai Lab are faculty, researchers, technical assistants and secretaries, and students in the doctoral program, master's program, and undergraduate program.As of 2026
- ProfessorTakaaki Tomai
- Associate ProfessorKazuyuki Iwase
- Project Associate ProfessorYusuke Hashimoto
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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: “Critical carbon dioxide-3” Bernhard Kuemel、Regi51 / CC BY-SA 2.0 at (cropped)
- Understanding Interfaces to Control Structure: “Brick of aerogel” Courtesy NASA/JPL-Caltech / Public domain (cropped)
- Electrocatalysts of Inorganic Nanomaterials: “Bhv-124 hg” Hannes Grobe / CC BY 4.0 (cropped)
- Electrochemistry of High-Temperature, High-Pressure Fluids: “Glass Pressure Reactor” Rudyher27 / CC BY-SA 4.0 (cropped)
- Controlling Particle Size with Data Science: “CdTe quantum dots” Ruslan.Ka / CC BY 4.0 (cropped)
- Related lab (Watanabe Lab (System Development Division)): “Zinc hydroxycarbonate jungle” Arskatin / CC BY 4.0 (cropped)
- Related lab (Solvent Element Technology Lab): “Water drop 001” José Manuel Suárez from Spain / CC BY 2.0 (cropped)
- Related lab (Kasai Lab): “EFluor Nanocrystal Vials” Travis.jennings / CC BY 3.0 (cropped)
- Related lab (Yoshioka Lab): “FLAKES” TOP PLASTIC / CC BY-SA 4.0 (cropped)
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