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(Symbiotic 11) Analytical Chemistry Lab
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An analytical chemistry lab that uses lasers and positrons to make interfaces and atomic vacancies visible.
AboutAbout the lab
Making the invisible visible
The Analytical Chemistry Lab develops analytical chemistry methods for investigating substances thoroughly.
The lab believes that advancing analytical chemistry means making visible what could not be seen before.
Focusing on interfaces in solutions, cell membranes, and atomic vacancies, the lab works on methods for detecting atoms and molecules.
Its two main pillars are laser spectroscopy and analysis using positrons, the antiparticles of electrons.
Key terms
- Interface
- The boundary where different kinds of substances meet, such as liquid and solid or liquid and liquid.
- Interfacial tension
- The force acting along a boundary that tries to make the area of the interface as small as possible.
- Positron
- A particle with the same mass as an electron but a positive charge. It is the antiparticle of the electron.
- Atomic vacancy
- A site in a crystal where an atom that should be there is missing.
NewsLab news
A paper using positron annihilation spectroscopy to examine the effect of surface polishing on hydrogen embrittlement of pure iron was published in International Journal of Hydrogen Energy
A paper investigating the mechanism by which hexanol droplets move on their own was published in Langmuir
A master's student received a Poster Award at the 13th International Workshop on Positron & Positronium Chemistry
A master's student received an Encouragement Award at the Student Poster Session of the 188th Autumn Meeting of the Iron and Steel Institute of Japan
A study on annihilation sites of ortho-positronium in Y-type zeolite was published in Radiation Physics and Chemistry
ResearchResearch themes
Building on analytical chemistry, which investigates substances thoroughly, the lab develops methods that make visible what could not be seen before. Focusing on interfaces in solutions, cell membranes, and atomic vacancies, it creates methods for detecting atoms and molecules.
*Illustrative imageInterface Analysis with Laser Spectroscopy
The lab explores how molecules behave at interfaces, the boundaries between one substance and another. It develops methods that use lasers to measure mechanical properties such as interfacial tension and membrane tension, and it studies phenomena such as molecular adsorption at interfaces, visualization of flow, the mechanical properties of biomembrane models, and collective motion. The methods used include laser-induced surface deformation spectroscopy, quasi-elastic laser scattering, and near-field Raman spectroscopy.
*Illustrative imageAtomic Vacancy Analysis with Positrons
Rather than the elements listed in the periodic table, the lab analyzes atomic vacancies, the places where atoms are absent. Vacancies strongly affect the overall properties of a material. For example, GaP is transparent when it has no vacancies, but becomes opaque to light when vacancies are present. Positrons, which carry a positive charge, preferentially enter the places in a solid where atoms are absent, and there the time before they annihilate with electrons becomes longer. By measuring this lifetime, the lab investigates properties related to vacancies.
MembersFaculty
The members of the Analytical Chemistry Lab are faculty members, master's students, and fourth-year undergraduate students.As of 2025
- Assistant ProfessorTomonori Nomoto
- Assistant ProfessorLuca Chiari
VoicesStudent voices
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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: “PDW Measurement Dispersion Red Light” Skilbride21 / CC BY-SA 4.0 (cropped)
- Interface Analysis with Laser Spectroscopy: “Raman measurement of ionic liquid droplet” Tavo Romann / CC BY 4.0 (cropped)
- Atomic Vacancy Analysis with Positrons: “Positronium Beam - positron source” UCL Faculty of Mathematical & Physical Sciences / CC BY 2.0 (cropped)
- Related lab (Hirahara Lab): “CSIRO ScienceImage 1074 Carbon nanotubes being spun to form a yarn” division, CSIRO / CC BY 3.0 (cropped)
- Related lab (Surface Electrochemistry Lab): “Platinum-crystals” Jurii / CC BY 3.0 (cropped)
- Related lab (Miyamae-Kameyama Lab): “TiSa crystal” No machine-readable author provided. Mathieu Perrin assumed (based on copyright claims). / CC BY 2.5 (cropped)
- Related lab (Miyamoto Lab): “Laser LY-RGBW01 internals optical table shining in smoke PC301982” Alexey Vazhnov / CC BY-SA 4.0 (cropped)
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