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  • Tuning pore size and hydrophobicity of macroporous hybrid silica films with high optical transmittance by a non-template route

    Author(s)
    Yang, Dongjiang
    Xu, Yao
    Xu, Wujun
    Wu, Dong
    Sun, Yuhan
    Zhu, Huaiyong
    Griffith University Author(s)
    Yang, Dongjiang
    Year published
    2008
    Metadata
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    Abstract
    Macroporous silica films with methyl groups grafted on their surface were prepared from polymethylhydrosiloxane (PMHS) and tetraethylorthosilicate (TEOS) without templates. Compared to the conventional template syntheses, this approach has several advantages. First, it avoids the removal of templates, which is sometimes an environmentally unfriendly procedure. Second, it does not require a post-synthesis grafting to form the hybrid structures with methyl groups on the silica surface. Third, the pore size and hydrophobicity (expressed by the water contact angle) of the film can be tuned readily. By adjusting the amount of ...
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    Macroporous silica films with methyl groups grafted on their surface were prepared from polymethylhydrosiloxane (PMHS) and tetraethylorthosilicate (TEOS) without templates. Compared to the conventional template syntheses, this approach has several advantages. First, it avoids the removal of templates, which is sometimes an environmentally unfriendly procedure. Second, it does not require a post-synthesis grafting to form the hybrid structures with methyl groups on the silica surface. Third, the pore size and hydrophobicity (expressed by the water contact angle) of the film can be tuned readily. By adjusting the amount of PMHS used in the synthesis and introducing hexamethyldisilazane (HMDS) we can tune the pore size in a wide range from 50 nm to 500 nm. The hydrophobicity increases substantially as the pore size decreases. Evidently, the reaction mechanism of this synthesis is different from the conventional template synthesis. A tentative mechanism is proposed: the hydrogen gas released from PMHS results in the formation of the macropores in the films. With excellent hydrophobicity, optical transmittance and thermal stability, the obtained silica films have potential applications in the semiconductor industry.
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    Journal Title
    Journal of Materials Chemistry
    Volume
    18
    Issue
    45
    DOI
    https://doi.org/10.1039/B804967J
    Subject
    Colloid and Surface Chemistry
    Chemical Sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/40458
    Collection
    • Journal articles

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