A filterless multistage elbow flow channel aerosol removal system has been developed to treat bioaerosols such as COVID-19. In this system, aerosol particles carried by high-speed airflow collide with a photocatalyst placed inside the system by inertial force and turbulent diffusion, and viruses contained in the aerosol are securely treated by the photocatalyst. Since the main component of the bioaerosol is water, it evaporates immediately after impacting the photocatalyst, leaving only the virus on its surface, which is mineralized by photocatalytic oxidation. When this system was operated in a 4.5 m3 aerosol chamber, 99.8% of aerosols from 1 to 10 μm were removed within 15 minutes.
Photocatalyst is widely used as an antibacterial and antivirus material. Since typical photocatalysts such as TiO2, can indiscriminately inactivate various microorganisms, they are effective to remove harmful microorganisms. On the other hand, photocatalysts can be applied in a broad area if specific microorganisms are inactivated with photocatalyst. In this article, we show unique photocatalysts for which selective microbial inactivation was observed. We focus on the protein of phage as a virus model and clarify the mechanism of inactivation by comparison with model protein.
We describe the details and concrete analysis of selective microorganism inactivation mechanism with photocatalyst.
Photocatalytic hydrogen production reactions have been attracting attention as a solution to the recent energy depletion problem. However, their efficiency is still low, and they have not yet been put to practical use. We have designed a novel photocatalyst based on photosynthesis as a new development for highly efficient hydrogen production reactions. In this review, we introduce a hydrogen production reaction using photosystem I complex, a photoreforming reaction using CdS/SiC composite photocatalyst, and a water splitting reaction using CdWO4/CdS/SiC composite photocatalyst.
Nanohybrid photocatalysts consisting of metals and semiconductors hold the key to realizing solar chemical transformations. Generally, the improvement of the performance requires precise interface control to bring out the concerted effect. This review article highlights the importance of atomically commensurate junctions for nanohybrid photocatalysts. Firstly, the methods for synthesizing nanohybrid crystals with heteroepitaxial junction (HEPI) are described. Secondly, HEPI junction-induced effects on a series of photophysical and chemical processes in the photocatalytic reaction are treated. Thirdly, we introduce some chemical transformations by nanohybrid photocatalysts with HEPI junction concentrating our research. Finally, the conclusions and future prospects are summarized.
Total luminous flux with omnidirectional light distribution is evaluated using high-quality incandescent standard lamps. With the spread of light-emitting diode (LED) lighting in recent years, some traditional standard lamps were discontinued and are becoming more difficult to obtain. We developed a standard light source based on LED that emits light in all directions and covers the full visible wavelength range as an alternative to the conventional standard lamps. In this article, design concepts of our standard LED for evaluating omnidirectional distribution light sources and characteristics of the standard LED are described.
Seiko Epson has developed a sublimation transfer printer based on its own printhead technology that can be optimally designed for commercial and industrial applications and promotes high productivity for textile applications.
The sublimation transfer printers SC-F10050 / SC-F10050H developed by Epson are equipped with PrecisionCore micro TFP printheads and have high basic performance that can provide short delivery times while maintaining stable image quality and stable operation with high productivity.