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Murashima Lab
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The lab studies tribofilms formed on DLC films and friction surfaces that carry microorganisms.
AboutAbout the lab
Understanding friction and wear through the films that form on sliding surfaces.
The Murashima Lab belongs to the Nano-Interface Control Engineering field of the Department of Finemechanics, Graduate School of Engineering, and conducts research in tribology, which deals with friction and wear on surfaces where machine parts rub against each other.
The lab has studied the relationship between tribofilms, which form through friction from additives in lubricating oil, and DLC films, which offer excellent low friction and wear resistance.
It is now developing technology to stably carry microorganisms on the surfaces of machine materials, in order to reduce friction and improve wear resistance.
The lab's website is published jointly with the Adachi-Kuriyagawa Lab as the "Adachi-Kuriyagawa / Murashima Lab" site.
Key terms
- Tribology
- The science and technology of surfaces and contact interfaces. A field that holds the key to the reliability, durability, and performance of machines.
- DLC film
- Short for diamond-like carbon. A carbon-based thin film with excellent low friction and wear resistance.
- Tribofilm
- A film of reaction products that additives in lubricating oil form through friction on metal sliding surfaces. It has excellent friction and wear properties.
ResearchResearch themes
Additives in machine lubricating oil form tribofilms with excellent friction and wear properties through friction on metal sliding surfaces, but it has been reported that they do not form low-friction films on DLC films. The lab has studied how to guide tribofilm growth by changing the carbon structure of DLC films. It is now developing technology to carry microorganisms on the surfaces of machine materials, with the aim of reducing friction and improving wear resistance.
*Illustrative imageTribofilms growing on DLC films
It has been reported that lubricating oil additives do not form low-friction films on DLC films and can cause abnormal wear. The lab ran friction tests on DLC films with different structures and nitrogen contents, and confirmed that on DLC films containing an appropriate amount of nitrogen, ZDDP-derived tribofilms grow faster and more uniformly, greatly improving friction and wear properties.
Friction surfaces coexisting with microorganisms
The lab is developing technology to stably carry microorganisms on the surfaces of machine materials and give them functions such as reduced friction and improved wear resistance. It makes use of flexible molecular network structures (double-network gels) and surface texturing. In the future, it also aims to produce lubricating substances on the spot from the products of the microorganisms.
MembersFaculty
- Associate ProfessorMotoyuki Murashima
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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: “Diamond-like carbon coated cobalt ball” Drac2000 at English Wikipedia / CC BY-SA 3.0 (cropped)
- Tribofilms growing on DLC films: “Ionic liquid anti-wear additive ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Related lab (Adachi-Kuriyagawa Lab): “Friction-driven Encoder Test (encoder 01-CC)” International Gemini Observatory/NOIRLab/NSF/AURA / CC BY 4.0 (cropped)
- Related lab (Biwa Lab): “Flame-tube-resonance-overlay” MikeRun / CC BY-SA 4.0 (cropped)
- Related lab (Shoji Lab): “150 deg water contact angle” Plasmatreat Khoren / CC BY 3.0 (cropped)
- Related lab (Ogawa-Saito-He Lab): “Gas Turbine Blade” Pro-Per Energy Services / CC BY-SA 4.0 (cropped)
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