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Tohmyoh-Kimura Lab
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A lab that makes, joins, examines, and uses micro-scale materials.
AboutAbout the lab
Make, join, examine, use.
The Tohmyoh-Kimura Lab takes an interdisciplinary approach to creating new material systems.
To take advantage of micro-scale materials with excellent properties and shapes, the lab handles making, joining, examining, and using them as one continuous process.
The lab has identified the factors that govern the phenomenon in which passing direct current through the contact between micro-scale materials causes localized melting by Joule heating, making it possible to join materials with high reliability.
Its work also extends to studies of hair and nails, and to developing methods that use sound waves and electric current to inspect bonded interfaces and thin layers.
Key terms
- Joule heating
- Heat generated where there is resistance when an electric current flows
- Ultrasound
- Sound at a frequency too high for human ears to hear. It is used to examine the inside of objects without damaging them
- Thermoelectric conversion
- Extracting electricity from a temperature difference, or conversely, creating a temperature difference with electricity
NewsLab news
Assistant Professor Kimura received the Japan Society of Mechanical Engineers (JSME) Encouragement Prize (Research) for fiscal 2024
Professor Tohmyoh received the Materials and Processing Division Award (Achievement Award) from the Japan Society of Mechanical Engineers (JSME)
ResearchResearch themes
The lab studies making, joining, examining, and using micro-scale materials as one continuous process, in order to take advantage of their excellent physical properties and geometric features. It also develops methods that use sound waves and electric current to inspect bonded interfaces and thin layers, which are key to the performance and reliability of next-generation material systems.
*Illustrative imageCharacterization and Use of Micro-Scale Materials
Using micro-scale materials requires knowing their properties accurately. The lab developed load sensors that measure extremely small forces to evaluate mechanical properties, and controlled strength by growing crystal grains with Joule heating. It is also developing a liquid sensor that takes advantage of the electrical properties of a thin film with nanowires on its surface.
*Illustrative imageMechanical Properties and Shape of Hair and Nails
Hair and nails, which grow every day, have properties and shapes that contain information useful in many fields. For hair and nails, which have multilayer structures, the lab proposed a structural elastic modulus, which expresses how easily they deform regardless of their outer dimensions, and used it to evaluate the effects of shampoo and nail polish.
*Illustrative imageThermoelectric Devices Made from Thin Plates and Fine Wires
When an aluminum thin film is deposited on the surface of a thin iron plate to create an interface between dissimilar metals, an electromotive force arises from the temperature difference along the length of the plate. To make use of temperature differences in everyday surroundings, the lab increases output by oxidizing the surface and stacking devices.
*Illustrative imageAdvanced Evaluation Using Sound Waves and Electric Current
The lab developed a dry ultrasonic method, in which a thin film is placed between water and the object being inspected to transmit high-frequency ultrasound, and succeeded in seeing inside electronic components at high resolution without getting them wet. It has also developed an imaging method that uses acoustic resonance to visualize the physical properties and thickness of thin films.
MembersFaculty
The members of the Tohmyoh-Kimura Lab are faculty, master's students, and undergraduate students.As of 2026
- ProfessorHironori Tohmyoh
- Assistant ProfessorYoshinari Kimura
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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: “2N4957 wire bonding” Mister rf / CC BY-SA 4.0 (cropped)
- Characterization and Use of Micro-Scale Materials: “2N3055 - close up pic of wires bonding to the silicon package” Mister rf / CC BY-SA 4.0 (cropped)
- Mechanical Properties and Shape of Hair and Nails: “Water drop on human hair” Rodrigo Menezes (Ironman br) / CC BY-SA 4.0 (cropped)
- Thermoelectric Devices Made from Thin Plates and Fine Wires: “Thermocouple K (1)” Harke / Public domain (cropped)
- Advanced Evaluation Using Sound Waves and Electric Current: “Surface waves” Roger McLassus / CC BY-SA 3.0 (cropped)
- Related lab (白須 研究室): “Woven carbon fiber fabric” Acheolg / CC BY-SA 4.0 (cropped)
- Related lab (内一・
LESMANA 研究室): “Nondestructive testing Prommashkomplekt” Balashka at Russian Wikipedia / CC0 (cropped) - Related lab (祖山・中居 研究室): “Cavitating-prop” U.S. Navy / Public domain (cropped)
- Related lab (金森 研究室): “Optical Therapeutics and Medical Nanophotonics Laboratory ( )” The U.S. Food and Drug Administration / Public domain (cropped)
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