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Kazuhito Hashimoto - One of the best experts on this subject based on the ideXlab platform.

  • Photoinduced Surface Wettability Conversion of ZnO and TiO2 Thin Films
    Journal of Physical Chemistry B, 2001
    Co-Authors: Akira Nakajima, Akira Fujishima, Toshiya Watanabe, Kazuhito Hashimoto
    Abstract:

    The photoinduced Surface Wettability conversion reactions of ZnO and TiO2 thin films were investigated by means of water contact angle measurement and X-ray photoelectron spectroscopy. Before ultraviolet (UV) illumination, ZnO and TiO2 films exhibited water contact angles of ∼109 and ∼54°, respectively. UV illumination turned both Surfaces to highly hydrophilic with water contact angles smaller than 10°. Storage in the dark reconverted the highly hydrophilic films to their original states. Reversible Surface Wettability conversion reactions were achieved by alternate UV illumination and storage in the dark on both the films. The similar behaviors of Wettability conversion observed on ZnO and TiO2 Surfaces suggest that they follow a similar conversion mechanism. Preferential adsorption of water molecules on the photogenerated Surface defective sites is ascribed to the formation of highly hydrophilic ZnO and TiO2 Surfaces. Achievement of highly hydrophilic ZnO and TiO2 Surfaces by high-temperature annealing...

  • Studies of Surface Wettability Conversion on TiO2 Single-Crystal Surfaces
    Journal of Physical Chemistry B, 1999
    Co-Authors: Rong Wang, And Toshiya Watanabe, Akira Fujishima, Nobuyuki Sakai, Kazuhito Hashimoto
    Abstract:

    Reversible Surface Wettability conversion on titanium dioxide (TiO2) single crystals has been achieved, and its mechanism has been examined by means of contact angle measurement and X-ray photoelectron spectroscopy (XPS). A UV light illuminated TiO2 single-crystal Surface exhibited a 0° contact angle for both water and oil, indicative of a highly amphiphilic Surface against its native hydrophobic Surface. This was ascribed to photoreduction of Surface Ti4+ to Ti3+ at definite sites, leading to preferential adsorption of dissociative water on top. A long-term storage of the highly amphiphilic Surface resulted in reconversion of the Surface Wettability. It was found that the amphiphilic-to-hydrophobic reconversion is due to the replacement of the adsorbed hydroxyl groups by oxygen, which returns the Surface geometric and electronic structures similar to the native TiO2 Surface. The result of angle-resolved XPS measurement revealed that the Surface reactions occurred at the uppermost layers of the single cry...

Lei Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Patterning of controllable Surface Wettability for printing techniques
    Chemical Society Reviews, 2013
    Co-Authors: Dongliang Tian, Yanlin Song, Lei Jiang
    Abstract:

    Patterning of controllable Surface Wettability has attracted wide scientific attention due to its importance in both fundamental research and practical applications. In particular, it is crucial to form clear image areas and non-image areas in printing techniques based on wetting and dewetting. This review summarizes the recent research on and applications of patterning of controllable Surface Wettability for printing techniques, with a focus on the design and fabrication of the precise Surface Wettability patterning by enhancing the contrast of hydrophilicity and hydrophobicity, such as superhydrophilicity and superhydrophobicity. The selected topics mainly include patterned Surface Wettability for lithographic printing with different plate-making techniques, patterned Surface Wettability for microcontact printing with a patterned wetting stamp and special Wettability mediated patterning microtransfer printing, patterned Surface Wettability for inkjet printing with controllable Surface Wettability of the substrate and printing head to ink, and patterned Surface Wettability by a combination of different printing techniques. A personal perspective on the future development and remaining challenges of this research is also briefly discussed.

  • Ammonia Responsive Surface Wettability Switched on Indium Hydroxide Films with Micro- and Nanostructures
    The Journal of Physical Chemistry C, 2008
    Co-Authors: Weiqin Zhu, Jin Zhai, Zhongwei Sun, Lei Jiang
    Abstract:

    Switchable Surface Wettability that can be tuned reversibly between superhydrophobicity and superhydrophilicity has been successfully realized on indium hydroxide films with micro- and nanostructures. The films are superhydrophobic in the air with a water contact angle of 150.4 ± 0.9° while they turn superhydrophilic with a water contact angle of 0° after storage in an ammonia atmosphere, which means an ammonia responsive Surface wettablity switch. The novel Surface Wettability is ascribed to the multiple Surface structures and Surface free energy conversion of the films. This kind of smart Surface Wettability is promising in developing new types of ammonia detectors simply by virtue of the Surface Wettability conversion.

Peiqing Ying - One of the best experts on this subject based on the ideXlab platform.

Akira Fujishima - One of the best experts on this subject based on the ideXlab platform.

  • Photoinduced Surface Wettability Conversion of ZnO and TiO2 Thin Films
    Journal of Physical Chemistry B, 2001
    Co-Authors: Akira Nakajima, Akira Fujishima, Toshiya Watanabe, Kazuhito Hashimoto
    Abstract:

    The photoinduced Surface Wettability conversion reactions of ZnO and TiO2 thin films were investigated by means of water contact angle measurement and X-ray photoelectron spectroscopy. Before ultraviolet (UV) illumination, ZnO and TiO2 films exhibited water contact angles of ∼109 and ∼54°, respectively. UV illumination turned both Surfaces to highly hydrophilic with water contact angles smaller than 10°. Storage in the dark reconverted the highly hydrophilic films to their original states. Reversible Surface Wettability conversion reactions were achieved by alternate UV illumination and storage in the dark on both the films. The similar behaviors of Wettability conversion observed on ZnO and TiO2 Surfaces suggest that they follow a similar conversion mechanism. Preferential adsorption of water molecules on the photogenerated Surface defective sites is ascribed to the formation of highly hydrophilic ZnO and TiO2 Surfaces. Achievement of highly hydrophilic ZnO and TiO2 Surfaces by high-temperature annealing...

  • Studies of Surface Wettability Conversion on TiO2 Single-Crystal Surfaces
    Journal of Physical Chemistry B, 1999
    Co-Authors: Rong Wang, And Toshiya Watanabe, Akira Fujishima, Nobuyuki Sakai, Kazuhito Hashimoto
    Abstract:

    Reversible Surface Wettability conversion on titanium dioxide (TiO2) single crystals has been achieved, and its mechanism has been examined by means of contact angle measurement and X-ray photoelectron spectroscopy (XPS). A UV light illuminated TiO2 single-crystal Surface exhibited a 0° contact angle for both water and oil, indicative of a highly amphiphilic Surface against its native hydrophobic Surface. This was ascribed to photoreduction of Surface Ti4+ to Ti3+ at definite sites, leading to preferential adsorption of dissociative water on top. A long-term storage of the highly amphiphilic Surface resulted in reconversion of the Surface Wettability. It was found that the amphiphilic-to-hydrophobic reconversion is due to the replacement of the adsorbed hydroxyl groups by oxygen, which returns the Surface geometric and electronic structures similar to the native TiO2 Surface. The result of angle-resolved XPS measurement revealed that the Surface reactions occurred at the uppermost layers of the single cry...

Akira Nakajima - One of the best experts on this subject based on the ideXlab platform.

  • Photoinduced Surface Wettability Conversion of ZnO and TiO2 Thin Films
    Journal of Physical Chemistry B, 2001
    Co-Authors: Akira Nakajima, Akira Fujishima, Toshiya Watanabe, Kazuhito Hashimoto
    Abstract:

    The photoinduced Surface Wettability conversion reactions of ZnO and TiO2 thin films were investigated by means of water contact angle measurement and X-ray photoelectron spectroscopy. Before ultraviolet (UV) illumination, ZnO and TiO2 films exhibited water contact angles of ∼109 and ∼54°, respectively. UV illumination turned both Surfaces to highly hydrophilic with water contact angles smaller than 10°. Storage in the dark reconverted the highly hydrophilic films to their original states. Reversible Surface Wettability conversion reactions were achieved by alternate UV illumination and storage in the dark on both the films. The similar behaviors of Wettability conversion observed on ZnO and TiO2 Surfaces suggest that they follow a similar conversion mechanism. Preferential adsorption of water molecules on the photogenerated Surface defective sites is ascribed to the formation of highly hydrophilic ZnO and TiO2 Surfaces. Achievement of highly hydrophilic ZnO and TiO2 Surfaces by high-temperature annealing...