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Eco-friendly nanocomposite products based on BPA-free epoxy–silica hybrid materials for stone conservation

  • Olivia Gómez-LasernaEmail author
  • Gabriele Lando
  • Leire Kortazar
  • Irantzu Martinez-Arkarazo
  • Iciar Monterrubio
  • Elena Sevillano
  • Paola Cardiano
  • María Ángeles Olazabal
Original Paper
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Abstract

Epoxy–silica hybrids (i.e., as such, enriched with TiO2 and cerium-doped TiO2 nanoparticles), based on a bisphenol (BPA)-free cycloaliphatic precursor, were designed for potential applications as stone conservation multifunctional materials. To this aim, nanoparticles were specifically prepared and their suitability for incorporation into the hybrids was assessed by means of X-ray diffraction (XRD), BET porosimetry, and photocatalytic activity measurements. On the other hand, the organic-inorganic materials, both undoped and doped with nanoparticles, were sol-gel synthesized in methanol starting from 1,4-cycloexanediglycidyether (CHDM-DGE) and 1,8-diaminooctane (DAO), in the presence of silica-forming additives, such as 3-glycidyloxypropyltrimethoxysilane (GPTMS), tetraethyl orthosilicate (TEOS), and isobuthyl (trimethoxy) silane (iBuTMS). A multianalytical methodology was employed for material characterization. The homogeneity, the extent of the epoxy cleavage, and the absence of partially hydrolyzed Si (OR)3 groups in the cross-linked hybrid networks were established thanks to a combination of scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM-EDS), and imaging Raman analysis. Moreover, the thermal, hydrophobic, and chromatic properties of the hybrids were investigated by thermogravimetry/differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), contact angle, and color measurements. Finally, the antimicrobial characterization was studied using a sowing strain of Gram-positive bacteria. The results showed that, among all, one of the epoxy–silica hybrid formulations features some of the main prerequisites to be fulfilled for a successful stone conservation treatment.

Keywords

Hybrid materials Bisphenol A-free Self-cleaning Biocidal capacity Nanocomposites 

Notes

Acknowledgments

L. Kortazar gratefully acknowledges her post-doctoral contract from the University of the Basque Country (UPV-EHU) (ESPDOC 2018). The authors are grateful to the technical support provided by the Raman-LASPEA laboratory and to the General X-Ray Service: Unit of Rocks and Minerals, of The Advanced Research Facilities of the SGIker (UPV/EHU, MICINN, GV/EJ, ERDF, and ESF).

Funding information

This work has been financially supported by the project PHETRUM (CTQ2017-82761-P) from the Spanish Ministry of Economy and Competitiveness (MINECO) and by the European Regional Development Fund (FEDER).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Olivia Gómez-Laserna
    • 1
    Email author
  • Gabriele Lando
    • 2
  • Leire Kortazar
    • 1
  • Irantzu Martinez-Arkarazo
    • 1
  • Iciar Monterrubio
    • 1
  • Elena Sevillano
    • 3
  • Paola Cardiano
    • 2
  • María Ángeles Olazabal
    • 1
  1. 1.Department of Analytical ChemistryUniversity of the Basque Country (EHU/UPV)BilbaoSpain
  2. 2.Department of Chemical, Biological, Pharmaceutical and Environmental SciencesUniversity of MessinaMessinaItaly
  3. 3.Department of Immunology, Microbiology and ParasitologyUniversity of the Basque Country (UPV/EHU)BilbaoSpain

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