Chemistry and technology for understanding and controlling the atmosphere.
Social Infrastructure (Saitama University Research Seed Collection 2025-27 p.2)
Keywords: Air pollution, PM2.5, ultrafine particles, ultrasound, vacuum ultraviolet, reactive species, air purification.
Photochemical smog and PM2.5 are very close atmospheric environmental issues. These gas/particulate pollutants can be directly emitted, but many are generated through photochemical reactions in the atmosphere. For example, knowing which components exist at what particle sizes in particulate pollutants is crucial information for controlling the occurrence of pollution. On the other hand, these pollutants can also be completely decomposed and neutralized using further photochemical reactions. Therefore, we are engaged in research and development in two main areas. One area is the investigation of the atmospheric behavior of particulate pollutants both indoors and outdoors, which includes the development of particle size classification collection methods, evaluation of chemical components in particles, and reaction model experiments using indoor chambers. The other area involves research on the integration of elemental technologies that can effectively generate reactive species such as vacuum ultraviolet light, photocatalysts, and ultrasound, as well as the effective utilization of reaction fields, aiming to develop air purification methods capable of high-efficiency decomposition of gas/particulate pollutants.
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Kazuhiko Sekiguchi, Professor Graduate School of Science and Engineering, Department of Material Science, Fundamental Material Area 【Recent Research Themes】 ● Experimental reaction models on the generation rate of secondary particles under indoor environmental conditions ● Particle size-specific observation and elucidation of particulate pollutants in the Southeast Asian region ● Decomposition treatment technology for gaseous pollutants utilizing gas-liquid interfacial reactions of mist ● Decomposition treatment technology for underwater pollutants utilizing gas-liquid interfacial reactions of fine bubbles ● Research on carbon dioxide reduction and fuel production using ultrasound
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【Appeal Points to the Industry】 ● We provide necessary information regarding particulate pollutants, both indoors and outdoors. We also support the actual measurement of particulate pollutants, including size classification and component analysis. ● We can offer technical proposals and support for the treatment of gas/particulate pollutants, including applications of vacuum ultraviolet, photocatalysts, and ultrasound, as well as effective control methods for decomposition products. ● We have filed multiple patents related to treatment devices for harmful substances and exhaust gases. 【Examples of Practical Applications and Utilization】 ● Evaluation of the behavior of particulate pollutants indoors and outdoors through component analysis. ● Investigation of the contamination status of fine and ultrafine particles through actual measurements. ● Stable generation of reactive species for environmental applications using vacuum ultraviolet, photocatalysts, and ultrasound. ● Decomposition and detoxification of volatile organic compound (VOC) gases and odor components using light and reactive species. ● Development of environmentally friendly air purification methods using water and reactive species.
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Effects of ultrasound by frequency
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.