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Shirasu Lab
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A lab that designs materials so that plastics can keep being used instead of thrown away.
AboutAbout the lab
Make, join, and use again.
The Shirasu Lab works on circular materials design, dealing with thermoplastics, their composites, and recycled materials.
It connects everything from material design through property evaluation, advanced measurement, and simulation, to the making of new materials.
Advancing 3D additive manufacturing and direct bonding to dissimilar materials can reduce machining and joining steps.
By using synchrotron radiation measurements to understand how resin degrades as it melts and solidifies, the lab aims to build a resource-circulation system with no waste or loss.
Key terms
- Thermoplastic
- A plastic that softens when heated and hardens again when cooled. It can be melted and reshaped many times
- Composite material
- A material that combines materials with different properties to achieve strength or lightness that a single material cannot
- Synchrotron radiation
- Very bright light, such as X-rays, emitted when electrons traveling at nearly the speed of light are bent. It can be used to examine structures inside materials
NewsLab news
Associate Professor Shirasu received the Ohji-Ohtsuka-Okamura Award (Encouragement Prize) and the top reviewer award of Composites: Part A
Associate Professor Shirasu received the Academic Encouragement Award of the Society of Materials Science, Japan, for fiscal 2023
A new adhesion strength evaluation method revealed how the chemical state of inorganic material surfaces affects adhesion strength
ResearchResearch themes
The lab is building circular materials design, which links material design and creation through property evaluation, advanced measurement, and simulation, for thermoplastics, composites containing carbon fiber or nanofillers, and their recycled materials. It aims to contribute to a circular society by reworking the life cycle of plastics.
*Illustrative imageJoining Dissimilar Materials by 3D Additive Manufacturing
With a 3D printer, high-strength, high-stiffness materials can be built in three dimensions in a short time. The lab developed a hybrid material in which a composite of carbon fiber and thermoplastic is printed directly onto a metal substrate, and achieved high bonding strength without using adhesive.
*Illustrative imageInterfacial Strength Evaluation of Multi-Material Structures
The lab succeeded in evaluating the interfacial strength between inorganic materials and adhesives using a newly developed adhesion strength test and finite element analysis. It is extending this method to hybrid materials of thermoplastic composites and metals, aiming to clarify how dissimilar materials bond to and peel from each other.
*Illustrative imageStructure and Properties of Recycled Plastics
Manufacturers are setting targets for the use of recycled plastics, and demand for high-quality ones is rising rapidly. Using property evaluation and synchrotron X-ray measurement, the lab seeks to understand how the properties and structure of recycled plastics change, and, together with molecular simulation, aims to create new materials.
*Illustrative imageResin Degradation Caused by Recycling
To recycle fiber-reinforced composites with a thermoplastic matrix efficiently, the lab evaluates changes in properties and structure, and in the distribution of fiber length and orientation, over repeated processing, using infrared spectroscopy and synchrotron X-ray diffraction and CT. These values are then fed into simulations to analyze mechanical properties.
MembersFaculty
The members of the Shirasu Lab are faculty, master's students, and undergraduate students.As of 2026
- Associate ProfessorKeiichi Shirasu
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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: “Woven carbon fiber fabric” Acheolg / CC BY-SA 4.0 (cropped)
- Joining Dissimilar Materials by 3D Additive Manufacturing: “3D printing filament” westonhighschool library / CC BY-SA 2.0 (cropped)
- Interfacial Strength Evaluation of Multi-Material Structures: “Abzugsvorrichtung TH50+SW” Ingeniero-aleman / CC BY-SA 3.0 (cropped)
- Structure and Properties of Recycled Plastics: “Pellets of reclycle ABS” Amandaprc / CC BY-SA 4.0 (cropped)
- Resin Degradation Caused by Recycling: “Carbon Knitted fabric made by SOHIM” Odzir / CC BY-SA 4.0 (cropped)
- Related lab (燈明・木村 研究室): “2N4957 wire bonding” Mister rf / 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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