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Kajihara Lab
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A lab working on processing that joins metals and resins, and on measurement that visualizes heat at the nanoscale.
AboutAbout the lab
Applying surface and interface phenomena to manufacturing.
The Kajihara Lab studies processing and measurement technologies related to the surfaces and interfaces of materials.
The lab works on technology that uses nano- and micro-scale structures to join metals and plastics without adhesives.
The lab also researches a microscope that detects the weak electromagnetic waves emitted from a surface, for example by heat, with nanoscale resolution.
The lab is located at the Institute of Industrial Science, and its graduate students belong to the Department of Precision Engineering in the Graduate School of Engineering.
Key terms
- Terahertz waves
- Electromagnetic waves with frequencies between radio waves and light. They are also emitted by materials themselves, for example through the motion of molecules
- Near field
- An optical field that exists only very close to the surface of an object. It makes it possible to examine a surface at a level of detail that ordinary microscopes cannot resolve
- Anchor effect
- An effect in which a material enters the fine irregularities of a surface and gets caught there like an anchor, resulting in a strong joint
NewsLab news
A doctoral student received the Best Presentation Award from the Japan Society for Precision Engineering
A master's student received the Advanced Best Presentation Award from the Japan Society for Precision Engineering
A student received the Best Presentation Award at the JSPE Autumn Meeting
A student received the Poster Award at the Symposia of the Japan Society of Polymer Processing
ResearchResearch themes
The lab analyzes phenomena that appear at surfaces and interfaces and applies the results to processing and measurement. The main themes are joining of dissimilar materials, nanoscale detection of heat (passive near-field measurement), and polarization measurement of terahertz waves.
*Illustrative imageA microscope that captures heat at the nanoscale
The lab is developing a "passive" near-field microscope that detects terahertz waves and other radiation emitted by materials themselves, without illuminating them with light. It makes it possible to observe the temperature distribution on a surface at the nanoscale.
*Illustrative imageExamining resins with terahertz waves
The lab is developing new methods for evaluating molded resin products, using infrared and terahertz measurements, which are well suited to resins. It is also pursuing research on evaluating the residual stress inside resins using the polarization of terahertz waves.
*Illustrative imageDirectly joining metals and resins
Fine irregularities are created on a metal surface, and molten resin is flowed into them, producing a strong joint without adhesives through the anchor effect. The lab has also developed a simple method that uses hot water treatment, in which the metal is immersed in high-temperature pure water.
*Illustrative imageChemical bonding at the joint interface
The lab analyzes the chemical interactions that occur at the interface between metal and resin. For aluminum alloys, it has been found that hydrogen bonding through hydroxyl groups formed on the surface makes the joint stronger.
MembersFaculty
The members of the Kajihara Lab consist of faculty, senior technical specialists, project specialist staff, senior collaborators, doctoral and master's students, and research interns.As of 2026
- ProfessorYusuke KajiharaPublications ↗
- Project Assistant ProfessorLin Kuan-TingPublications ↗
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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: “Standard two plate injection molding tool” Britiju at English Wikipedia / Public domain (cropped)
- A microscope that captures heat at the nanoscale: “Atomic Force Microscopy (AFM) tip attached to a tuning fork” Dinesh.dhankhar / CC BY 4.0 (cropped)
- Examining resins with terahertz waves: “Isochromatic” Midnight bird / CC BY-SA 3.0 (cropped)
- Directly joining metals and resins: “Anodizzazione dell'alluminio” Matteo Bordiga / CC BY-SA 4.0 (cropped)
- Chemical bonding at the joint interface: “Boric-acid-layer-3D-balls” Ben Mills / Public domain (cropped)
- Related lab (Kim Lab): “Meso reactor detail iX-factory without Logo” IX-factory STK / CC BY-SA 3.0 (cropped)
- Related lab (Kawakatsu Lab): “Atomic force microscope” Johannes Schneider / CC BY-SA 4.0 (cropped)
- Related lab (Microsystem Packaging Lab): “CSIRO ScienceImage 3876 A remote sensing node part of CSIROs Fleck wireless sensor network technology” Stephan Brosnan, CSIRO / CC BY 3.0 (cropped)
- Related lab (Niino Lab): “Laser Sintering - Entnahme eines Modell aus dem Baumaterial” i.materialise（YouTube） / CC BY-SA 3.0 (cropped)
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