Heavy improved optical properties

It was found that surface derivatives modify the redox properties of Ti02 particles if a surface modifier is an electron-donating species, and that the crucial parameter for effective removal of heavy metal ions is the trade-off between enhanced redox properties of Ti02 by surface modification and the enhanced redox potential of chelated metal ions. Surface modification can lead to the appearance of a charge transfer complex with small-particle Ti02 colloids that have an optical absorption threshold at 730 nm. The red shift of the optical absorption provides improved optical properties for use of visible light, i.e., for solar energy conversion [63]. 

Surfactant-based synthesis of mesoporous metal oxides and metal sulfides emerged about four years after the initial report of MCM-41 [21-36]. High surface area and thermally robust mesoporous metal oxides and sulfides represent a new class of materials with diverse opportunities for the development of improved fuel and solar cells, batteries, membranes, chemical delivery vehicles, heavy metal sponges, sensors, magnetic devices and new catalysts. All of these applications could benefit from tailorable Bronsted and Lewis acidity and basicity, flexible oxidation states, and tunable electronic, optical and magnetic properties. 

La20a, in proportions of up to 40%, is used in main optical glass (lanthanum heavy crown and heavy flint). The presence of this oxide endows the glass with a high transparency and improves its structural properties [5]. 

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