Visible-light activation

Visible light activated resin compositions containing calcium hydroxide have been made available as cavity lining materials (99) for pulp capping and pulpotomy, and may offer in other appHcations an alternative to the calcium sahcylate type cements. 

Nakamura, I., Negishi, N., Kutsuna, S. et al. (2000) Role of oxygen vacancy in the plasma-treated Ti02 photocatalyst with visible light activity for NO removal, J. Mol. Catal. A Chem. 161, 205-12. 

Mixed Ti-W oxides, after deposition of Pt, are active in the mineralization of toluene with sunlight excitation due to the low bandgap (2.7 eV) caused by the presence of both W and Pt in the anatase structure [87]. Vanadium was also used to prepare visible light active photocatalysts in dye degradation [88]. 

Yang, G., Jiang, Z., Shi, H., Xiao, T., and Yan, Z. (2010) Preparation of highly visible-light active N-doped Ti02 photocatalyst. Journal of Materials Chemistry, 20 (25), 5301-5309. 

Sakthivel, S., Janczarek, M., and Kisch, H. (2004) Visible light activity and photoelectrochemical properties of nitrogen-doped Ti02. Journal of Physical Chemistry B, 108 (50), 19384-19387. 

Shamaila, S., Sajjad, A.K.L., Chen, F., and Zhang, J. (2010) Study on highly visible light active Bi203 loaded ordered mesoporous titania. Applied Catalysis B Environmental, 94 (3—4), 272—280. 

Kobayakawa, K., Murakami, K., and Sato, Y., Visible-light active N-doped TiOz prepared by heating of titanium hydroxide and urea, Int.. Photochem. Photobio A Chem., 170,177, 2004. 

Carbon nanodots and other carbon surface species may act as efficient solid-state sensitizers to promote visible light absorption. In addition, various nanocarbons may act as semiconductors enabling to realize interesting Z-schemes for extended visible light activity. 

Yu, B. Y. Kwak, S.-Y., Carbon quantum dots embedded with mesoporous hematite nanospheres as efficient visible light-active photocatalysts. J. Mat. Chem. 2012,22 8345-8353. 

Fig. 6.11 A band model of N-doped Sr2Nb207 shows mixing of N2p with 02p states near the top of the valence band leading to band gap narrowing and visible light activity.

Liu H, Gao L (2004) (Sulfur, Nitrogen)-codoped rutile-titanium oxide as a visible-light-activated photocatalyst. J Am Ceram Soc 87 1582-1584... 

G.E.H.M. Dijkman, J. de Vries, A. Lodding, J. Arends, Long-term fluoride release of visible light-activated composites in vitro A correlation with in situ demineralization data, Caries Res. 27 (1993) 117-123. 

Photoreaction can remove thymidine-thymidine photodimers. Visible light activates the enzyme DNA photolyase. This enzyme absorbs visible light and transfers that energy to the photodimer, reversing the dimerization directly. 

Visible light-activated phototropic compositions comprising a hexaarylbii-midazole and a hydroxyphthalein dye. Walker, Peter (du Pont de Nemours, E. 

Visible light-activated phototropic compositions comprising a hexa-arylbi-imidazole and a bislalkylamino(acridine dye. Cohen, Robert L. (du Pont de Nemours, E. I., and Co.) U.S. 3,563,751 (Cl. 96-90 G 030), 16 Feb 1971, Appl. 20 Jul 1967, 5 pp. Acridine dyes of general formula I, where alkyl R2,R4 = H or... 

Nowadays non-metal doping attracts more and more attention. Among others nitrogen- [96-98] and carbon-doped titania [99, 100] show interesting visible light activity. 

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