Preparation of Transparent Thin Film of Novel Apatite-based Photocatalyst

Yoshida, Naoya; Ishida, Tomoko; Saiki, Chieko; Wakamura, Masato; Ohsaki, Hisashi; Hashimoto, Kazuhito; Watanabe, Toshiya

doi:10.1246/cl.2005.1666

Cited by 9 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…14) In fact, some photocatalysts show no photo-induced wettability change even though they show high photocatalytic oxidation power. Figure 5 shows water contact angle of hydroxyapatite doped with Ti ions (TiHAP) 15) and SrTiO3. 16) No wettability change was observed on these samples.…”

Section: Jcs-japanmentioning

confidence: 99%

Wettability of ceramic surfaces -A wide range control of surface wettability from super hydrophilicity to super hydrophobicity, from static wettability to dynamic wettability

Watanabe

2009

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

Surface wettability is dependent to surface energy of the material. Therefore the surface wettability basically reflects its intrinsic surface property and it has been thought that it is hard to be controlled arbitrarily. For example, inorganic materials such like metal oxides usually exhibit relatively hydrophilic property as compared with organic materials. However recent series of studies by our group revealed that photo-induced surface reaction, nanometer scale roughness, nanometer scale physical and chemical heterogeneity affect wettability greatly. This fact clearly shows that the surface wettability of a metal oxide can be controlled from superhydrophilic state to superhydrophobic state. The target of control includes not only static wettability but also dynamic wetttability. Oxide surface with high dynamic hydrophobicity can be obtained by optimizing these factors. Water repellency of developed hydrophobic ceramic surface turned out to be like a polymer surface. The novel technology to control wettability of ceramic surfaces is expected to contribute to various applications.

show abstract

Section: Jcs-japanmentioning

confidence: 99%

Wettability of ceramic surfaces -A wide range control of surface wettability from super hydrophilicity to super hydrophobicity, from static wettability to dynamic wettability

Watanabe

2009

J. Ceram. Soc. Japan

Self Cite

View full text Add to dashboard Cite

show abstract

“…As previously reported, TiHAP showed only slight increase in UV region. 1 If it was considered that calcium phosphate (CP) is not a photo-semiconductor but insulator, plausibly metal-doped CPs do not have strong absorption bands in UV-vis region.…”

Section: Resultsmentioning

confidence: 99%

“…Previously we have reported preparation of photocatalytic thin film 1 based on a novel apatite Ti-doped calcium hydroxyapatite (TiHAP), 2 which have calcium hydroxyapatite (HAP) structure partially substituted with Ti 4+ ions at calcium sites. This photocatalyst is found to be different from composite systems of TiO 2 and an adsorbent (apatite, activated carbon, zeolite, and so on).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Photocatalytic Thin Films of Tricalcium Phosphate by Doping Titanium(iv) Ion

Yoshida

Nakamura

Okura

2014

Phosphorus Research Bulletin

Self Cite

View full text Add to dashboard Cite

: Thin films of tricalcium phosphate (TCP) with doping Ti(IV) ion were prepared. These prepared films were characterized by XRD, UV-vis transmission, FT-IT (RAS), and wettability. These characterization indicated that phase separation such as TiO 2 did not occur and that substitution with Ti(IV) occurred at Ca site. Photocatalytic activity was evaluated by methylene blue decomposition, and the results suggested that the activity was enhanced by doping Ti(IV).

show abstract

“…Additionally, TiHAP films can be prepared by a wet process. The prepared film has a high transparency with little fringe color 26…”

Section: Design Of Sustainable Hydrophobic Surfacementioning

confidence: 99%

Wettability control of a solid surface by utilizing photocatalysis

Watanabe

Yoshida

2008

The Chemical Record

Self Cite

View full text Add to dashboard Cite

This paper describes a strategic approach utilizing a photocatalyst to obtain a solid surface with a high level of sustainable wettability (hydrophilicity or hydrophobicity). We clarified that the substances adsorbed on the surface could be successfully removed by photocatalytic oxidation resulting in sustainable high hydrophilic and high hydrophobic states. In addition to the conventional redox reaction, photoinduced wettability conversion plays an inevitable role in obtaining a superhydrophilic state. Both of the aforementioned photoinduced properties can be applied to sustain a high level of hydrophilicity. A superhydrophobic surface can be designed based on the Cassie theory. However, a combination with the usual TiO2 photocatalyst leads to a decrease in hydrophobicity because the photocatalyst becomes hydrophilic itself as a result of the photoinduced hydrophilic reaction. Utilizing the newly developed hydroxyapatite doped with Ti(IV) ions (TiHAP) photocatalyst, which has a considerably reduced hydrophilic effect, a superhydrophobic surface can be sustained after exposing it to outdoor conditions for a long period. As for sustaining the hydrophobic state, the introduction of a material design based on dynamic wettability leads to the possibility of novel functional materials with a high dynamic hydrophobicity. Our study shows that a high level of wettability (hydrophilic or hydrophobic) of a solid surface as that sustained by biologic action is possible by utilizing photocatalysis.

show abstract

Preparation of Transparent Thin Film of Novel Apatite-based Photocatalyst

Cited by 9 publications

References 6 publications

Wettability of ceramic surfaces -A wide range control of surface wettability from super hydrophilicity to super hydrophobicity, from static wettability to dynamic wettability

Wettability of ceramic surfaces -A wide range control of surface wettability from super hydrophilicity to super hydrophobicity, from static wettability to dynamic wettability

Preparation of Photocatalytic Thin Films of Tricalcium Phosphate by Doping Titanium(iv) Ion

Wettability control of a solid surface by utilizing photocatalysis

Contact Info

Product

Resources

About