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Eco-Energy Engineering (Kojima) Lab
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The lab uses the chemical effects of ultrasound to make polymer and metal particles.
AboutAbout the lab
Transforming materials with the power of ultrasound.
Eco-Energy Engineering (Kojima Research Group) studies material conversion that uses the chemical and physical effects produced when ultrasound is applied to liquids at ambient temperature and pressure.
The lab also uses the mist generated by ultrasound as a reaction medium, working on the synthesis of temperature-responsive polymers and fine metal particles.
In its research on catalysts made with ultrasound, the lab studied how to enhance the activity of photocatalysts that work under visible light, aiming at applications in environmental remediation.
The lab belongs to the Systems Creation Division of the Institute of Materials and Systems for Sustainability, and is introduced under the name "Kojima Lab" in the institute's introductory materials.
Key terms
- Sonoprocess
- An ultrasound-assisted chemical process that makes use of the chemical and physical effects of ultrasound and atomization (mist)
- Cavitation
- A phenomenon in which tiny bubbles form when intense ultrasound is applied to a liquid. When the bubbles collapse, localized zones of high temperature and high pressure are created
- Photocatalyst
- A catalyst that absorbs light to drive chemical reactions. The research used tungsten oxide, which can absorb visible light
ResearchResearch themes
When ultrasound is applied to a liquid, cavitation produces localized high-temperature and high-pressure zones, shock waves, and fine droplets (mist). The lab uses these effects in sonoprocesses to synthesize polymers, control the structure of metal particles, and synthesize catalysts.
*Illustrative imageSynthesis of Temperature-Responsive Polymers
This research synthesizes the temperature-responsive polymer PNIPAM and its copolymers with HEMA by applying ultrasound to aqueous alcohol solutions, without using an initiator. It examines how the intensity of the ultrasound and the type of alcohol and monomer added affect the polymerization rate, average molecular weight, and lower critical solution temperature.
*Illustrative imageSynthesis of Fine Metal Particles Using Ultrasound
The lab uses ultrasonic spray pyrolysis, in which ultrasonic mist containing dissolved metal salts is sent into a high-temperature furnace, and sonochemical reduction, which produces metal nanoparticles at ambient temperature and pressure. With these methods, it works on controlling the fine structure of metal particles and synthesizing catalysts. By sending template polymer particles together with the mist, porous metal particles can also be designed.
MembersFaculty
- Associate ProfessorYoshihiro Kojima
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: “DL50 glass ultrasonic delay line - ultrasonic transducer” Mister rf / CC BY-SA 4.0 (cropped)
- Synthesis of Temperature-Responsive Polymers: “Gel balls” Renato Lombardero / CC BY 2.0 (cropped)
- Synthesis of Fine Metal Particles Using Ultrasound: “Gold nanoparticles as indicators” Valeg96 / CC BY-SA 4.0 (cropped)
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