TY - CHAP
T1 - Producing Self-cleaning, Transparent and Hydrophobic SiO2-crystalline TiO2 Nanocomposites at Ambient Conditions for Stone Protection and Consolidation
AU - Kapridaki, C.
AU - Faria Soares Pinho Da Silva, Luis Miguel
AU - Mosquera, M. J.
AU - Maravelaki-Kalaitzaki, Pagona
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2017.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84995530478&partnerID=8YFLogxK
U2 - 10.1039/9781782623991-00105
DO - 10.1039/9781782623991-00105
M3 - Chapter
AN - SCOPUS:84995530478
VL - 2017-January
T3 - RSC Smart Materials
SP - 105
EP - 141
BT - Self-Cleaning Coatings: Structure, Fabrication and Application
PB - Royal Society of Chemistry
ER -