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Composite and manufacturing method therefor
| Details |
Inventors: Nakamura, Masatoshi; Hatanaka, Yoshinori;
Assignee: Murakami Corporation (Shizuoka, JP)
Primary Examiner: Jones; Deborah
Assistant Examiner: Sperty; Arden B.
Attorney, Agent or Firm: Hedman & Costigan, P.C.
This invention provides a composite having a hydrophilic film made of amorphous titanium oxide. A film is deposited on a substrate made of, for example, glass or synthetic resin. The film is composed of amorphous titanium oxide partially having structures in which a network of Ti--O--Ti bond is broken to give Ti--OH bond terminals. |
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DETAILED DESCRIPTION Object of the Invention Formation of anatase-type titanium dioxide films requires a high temperature process, which has made it difficult to apply such a film to a base comprising a low melting temperature material such as synthetic resin.
For the base made of soda-glass, a high temperature process causes diffusion of sodium in the soda glass into the titanium dioxide film, leading to deteriorated performance (reduction in photoexcitation efficiency).
For preventing performance deterioration, it is necessary to form a passivation layer between the soda-glass base and the titanium dioxide film, leading to a more complicated manufacturing method.
In view of these problems, an objective of this invention is to provide a composite in which a novel amorphous titanium oxide film is deposited on a base surface for hydrophilicity and a manufacturing method therefor.
SUMMARY OF THE INVENTION This invention provides a composite comprising a base and a film mainly formed of amorphous titanium oxide on the base, wherein the amorphous titanium oxide partially has a structure in which a network of Ti--O--Ti bond is broken to give Ti--OH bond terminals.
In general, it is known that amorphous titanium oxide films have photoexcitation efficiency too low to give adequate hydrophilicity.
In contrast, our experiments showed that more hydrophilicity could be achieved by photoexcitation using the amorphous titanium oxide film of this invention partially comprising a structure in which a network of Ti--O--Ti bond is broken to give Ti--OH bond terminals.
It may be because in a common amorphous titanium oxide film, electrons and holes generated by photoexcitation might have a high probability of being recombined due to, for example, the presence of dangling bonds in the film, leading to reduced phdtoexcitation efficiency, while in a titanium oxide film according to this invention, dangling bonds in the film might be bound to OH groups to reduce the number of dangling bonds so that recombination of electrons and holes generated by photoexcitation might be inhibited and, furthermore, electron-releasing property of an OH group itself might contribute to improvement in hydrophilicity
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