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Inoue H.,Tokyo Metroplitan University | Inoue H.,Center for Artificial Photosynthesis

Mankind has been faced with many serious issues to be resolved in the present global situation for energy and environment. Sun light energy in ca. ten thousand times larger amount than it consumed by mankind should be a most promising source of energy in future. State of the art and the future prospect of artificial photosynthesis is here reviewed. © 2015 The Society of Polymer Science. Japan. Source

Lewis N.S.,California Institute of Technology | Lewis N.S.,Center for Artificial Photosynthesis
Electrochemical Society Interface

The development of a complex system, such as a solar fuels generator, requires much more than just the discovery of a catalyst, or of a photocatalyst, or even of a watersplitting nanoscale construct. It requires a full macroscale object that is embedded in, and forms the basis for, an article of manufacture that can be made at scale, and that can operate safely, cost-effectively, and efficiently over all length and time scales of interest. A highly integrated effort, involving individual research groups, teams of research groups, centralized, focused R&D efforts, and global cooperation is therefore important to realize this goal in a cost-effective, time-effective, and efforteffective fashion. This realization is the most compelling, and in fact the overriding, justification for a systems level approach to the successful development of a technology that enables the direct production, in a globally scalable fashion, of fuels from sunlight by artificial photosynthesis, to provide an important technology option in the pursuit of a globally scalable sustainable energy system. Source

Ohtani Y.,Tokyo Metroplitan University | Ishida Y.,Tokyo Metroplitan University | Ishida Y.,Japan Society for the Promotion of Science | Ando Y.,Tokyo Metroplitan University | And 5 more authors.
Tetrahedron Letters

Novel tetra-cationic xanthene derivative (Flu) was synthesized. Its adsorption and photochemical behaviors on the clay surface were investigated. Fluorescence quantum yield (φf) and fluorescence lifetime were 0.50 and 2.9 ns for Flu/clay complex. φf of Flu was enough high (>0.1) even at high density conditions (0.080 molecules nm-2). It is supposed that the strong interaction between clay and Flu by the 'Size-Matching Effect' realizes the highly emissive clay complexes at high density adsorption condition by a suppression of a molecular aggregation, which tends to decrease the photochemical activity. © 2013 Elsevier Ltd. All rights reserved. Source

Sato N.,Tokyo Metroplitan University | Fujimura T.,Tokyo Metroplitan University | Fujimura T.,Japan Society for the Promotion of Science | Shimada T.,Tokyo Metroplitan University | And 4 more authors.
Tetrahedron Letters

Adsorption, aggregation, and photochemical behavior of a cationic cyanine dye (5,5′,6,6′-tetrachloro-1,1′,3,3′-tetraethylbenzimidazolylcarbo-cyanine chloride (JC-1)) on an inorganic layered material were examined. JC-1 formed J-aggregates on the clay surface even at a low loading level. The structure of the J-aggregate was determined through analysis using the extended dipole model proposed by Kuhn et al. Aggregation number and slip angle of the J-aggregate on the clay surface were calculated as more than 8 molecules and 20-22°, respectively. The J-aggregate on the clay sheet exhibited high fluorescence quantum yield (0.4), thus, this complex will be promising to construct photochemical reaction systems such as artificial light harvesting systems. © 2015 Elsevier Ltd. All rights reserved. Source

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