Producing Self-cleaning, Transparent and Hydrophobic SiO2-crystalline TiO2 Nanocomposites at Ambient Conditions for Stone Protection and Consolidation

C. Kapridaki, Luis Miguel Faria Soares Pinho Da Silva, M. J. Mosquera, Pagona Maravelaki-Kalaitzaki

    Research output: Contribution in Book/Catalog/Report/Conference proceedingChapter

    Abstract

    Three innovative strengthening, protective and self-cleaning agents for marble and calcareous stones were synthesized by using a simple sol-gel route at ambient conditions. TiO2 nanoparticles and hydroxyl-terminated polydimethylsiloxane (PDMS) were incorporated in a tetraethoxysilane (TEOS) matrix in the presence of oxalic acid (Ox). Both the Ox concentration and the addition sequence of the reagent agents were assessed through the evaluation of the microstructure and of the physicochemical and self-cleaning properties of all the synthesized nanocomposites. The presence of Ox contributed to the production of both homogeneous materials and photoactive independent domains of anatase TiO2 crystals at ambient conditions. In addition, the role played by Ox as a hole-scavenger increased the photocatalytic activity of the nanocomposites. The synthesized crack-free, homogeneous, transparent and photoactive nanocomposites provide self-cleaning, water repellency and consolidation properties to building substrates, while respecting their aesthetic qualities.

    Original languageEnglish
    Title of host publicationSelf-Cleaning Coatings: Structure, Fabrication and Application
    PublisherRoyal Society of Chemistry
    Pages105-141
    Number of pages37
    Volume2017-January
    Edition21
    DOIs
    Publication statusPublished - 2017

    Publication series

    NameRSC Smart Materials
    Number21
    Volume2017-January
    ISSN (Print)20460066
    ISSN (Electronic)20460074

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