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Conservation of monuments by a three-layered compatible treatment of TEOS-Nano-Calcium Oxalate consolidant and TEOS-PDMS-TiO 2 hydrophobic/photoactive hybrid nanomaterials

Kapridaki Chrysi, Verganelaki Anastasia, Dimitriadou Pipina, Maravelaki Pagona

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URIhttp://purl.tuc.gr/dl/dias/E4C0E35A-C6FE-4D14-A105-1B3F2F9F4B60-
Identifierhttps://doi.org/10.3390/ma11050684-
Identifierhttps://www.mdpi.com/1996-1944/11/5/684-
Languageen-
Extent23 pagesen
TitleConservation of monuments by a three-layered compatible treatment of TEOS-Nano-Calcium Oxalate consolidant and TEOS-PDMS-TiO 2 hydrophobic/photoactive hybrid nanomaterialsen
CreatorKapridaki Chrysien
CreatorΚαπριδακη Χρυσηel
CreatorVerganelaki Anastasiaen
CreatorΒεργανελακη Αναστασιαel
CreatorDimitriadou Pipinaen
CreatorΔημητριαδου Πιπιναel
CreatorMaravelaki Pagonaen
CreatorΜαραβελακη Παγωναel
PublisherMDPIen
Content SummaryIn the conservation of monuments, research on innovative nanocomposites with strengthening, hydrophobic and self-cleaning properties have attracted the interest of the scientific community and promising results have been obtained as a result. In this study, stemming from the need for the compatibility of treatments in terms of nanocomposite/substrate, a three-layered compatible treatment providing strengthening, hydrophobic, and self-cleaning properties is proposed. This conservation approach was implemented treating lithotypes and mortars of different porosity and petrographic characteristics with a three-layered treatment comprising: (a) a consolidant, tetraethoxysilane (TEOS)-nano-Calcium Oxalate; (b) a hydrophobic layer of TEOS-polydimethylsiloxane (PDMS); and (c) a self-cleaning layer of TiO 2 nanoparticles from titanium tetra-isopropoxide with oxalic acid as hole-scavenger. After the three-layered treatment, the surface hydrophobicity was improved due to PDMS and nano-TiO 2 in the interface substrate/atmosphere, as proven by the homogeneity and the Si-O-Ti hetero-linkages of the blend protective/self-cleaning layers observed by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and Fourier-Transform Infrared Spectroscopy (FTIR). The aesthetic, microstructural, mechanical and permeabile compatibility of the majority of treated substrates ranged within acceptability limits. The improved photocatalytic activity, as proven by the total discoloration of methylene blue in the majority of cases, was attributed to the anchorage of TiO 2 , through the Si-O-Ti bonds to SiO 2 , in the interface with the atmosphere, thus enhancing photoactivation.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2019-09-17-
Date of Publication2018-
SubjectCement mortarsen
SubjectCompatibleen
SubjectConservationen
SubjectHydrophobicen
SubjectLimestoneen
SubjectMonumentsen
SubjectNanostructureden
SubjectPDMS-SiO 2 -TiO 2 nanocompositeen
SubjectSelf-cleaningen
SubjectTEOS-nano-Calcium Oxalateen
Bibliographic CitationC. Kapridaki, A. Verganelaki, P. Dimitriadou and P. Maravelaki-Kalaitzaki, "Conservation of monuments by a three-layered compatible treatment of TEOS-Nano-Calcium Oxalate consolidant and TEOS-PDMS-TiO 2 hydrophobic/photoactive hybrid nanomaterials," Materials, vol. 11, no. 5, Apr. 2018. doi: 10.3390/ma11050684en

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