A novel TiO2–SiO2 nanocomposite converts a very friable stone into a self-cleaning building material

Pinho, Luís; Elhaddad, Farid; Facio, Dario S.; Mosquera, María J.

doi:10.1016/j.apsusc.2012.10.142

Cited by 124 publications

(66 citation statements)

References 44 publications

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“…This confirms the role played by the nanoparticles in increasing the consolidant effect of the product, as previously reported by other authors [6,[26][27][28][29]. Table S1 show water droplet static and dynamic contact angle (CA) values.…”

Section: Evaluation Of the Effectiveness On Quarry Stonesupporting

confidence: 74%

“…This effect is not supposed to persist over time due to the progress of the hydrolysis reaction in both cases. This feature has been confirmed by the 29 Si-NMR spectra obtained for gels containing n-octylamine in a previous paper [12]. "The products containing n-octylamine presented Q1 and Q2 units in conjunction with Q3 and Q4 species six months after the synthesis, which indicated that the silica is not completely condensed and consequently, some ethoxy groups could be present in the material", as previously described [12,44].…”

Section: Evaluation Of the Effectiveness On Quarry Stonesupporting

confidence: 64%

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New Consolidant-Hydrophobic Treatment by Combining SiO2 Composite and Fluorinated Alkoxysilane: Application on Decayed Biocalcareous Stone from an 18th Century Cathedral

et al. 2018

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An effective procedure has been developed to consolidate and hydrophobize decayed monumental stones by a simple sol-gel process. The sol contains silica oligomer, silica nanoparticles and a surfactant, preventing gel cracking. The effectiveness of the process on biocalcareous stone samples from an 18th century cathedral has been evaluated, and it was found that the gel creates effective linking bridges between mineral grains of the stone. Silica nanoparticles produced a significant increase in the mechanical resistance and cohesion of the stone. The application of an additional fluorinated oligomer onto the consolidated stone gave rise to a surface with lasting hydrophobicity, preventing water absorption.

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Section: Evaluation Of the Effectiveness On Quarry Stonesupporting

confidence: 74%

Section: Evaluation Of the Effectiveness On Quarry Stonesupporting

confidence: 64%

New Consolidant-Hydrophobic Treatment by Combining SiO2 Composite and Fluorinated Alkoxysilane: Application on Decayed Biocalcareous Stone from an 18th Century Cathedral

et al. 2018

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“…Successful applications of nanomaterials in crack injection or in the remediation of building materials found in humid or chemically contaminated environments and other are also documented in foreign practice [11][12]. Within the development of nanomaterials, metal oxides, especially ZnO and TiO 2 , have been shown to be useful for protection against microorganisms and UV degradation due to their antifungal and antibacterial effects [13][14][15]. From foreign publications is known the efficiency of titanium coatings deposited on historic architectural stone surfaces as self-cleaning [16][17][18].…”

Section: Article No 19 the Civil Engineering Journal 3-2017mentioning

confidence: 99%

NANOTECHNOLOGY IN THE CULTURAL HERITAGE - INFLUENCE OF NANOSPENSIONS ADOPTED BY NANOPARTICLES OF TiO2 FOR CLEANING THE SURFACE OF HISTORICAL PLASTERS

Kroftová¹,

Šmidtová²,

Kuřitka³

et al. 2017

CEJ

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The continuous development of nanostructure and the study of physico -chemical processes in the nanometer range lead to new methods that can slow down the degradation processes of a work of art, or even restore damage caused, for example, by an inappropriate restoration process. The use of nanosuspensions based on calcium hydroxide is probably the most widespread application of nanomaterials in heritage care, especially in the field of hardening of lime building materials (plaster, limestone, etc.). In combination with titanium dioxide, it should be a successful suspension in the fight against biological agents, surface contamination or in the protection of UVresistant building materials.

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“…The prepared sols had low viscosities (Table 1) and they should be able to penetrate deeper into the stone and should make easier the use of an aerosol generator to apply the product in situ [1,42]. In a previous study, Pinho et al determined the viscosity for one of the most popular commercial stone consolidants, Tegovakon V100 from Evonik; the viscosity of this solvent-free product was 5.25 mPa s at 25 • C [43]. Therefore, we think that these obtained sols, with lower viscosities, must assure an adequate penetration into the stone pore structure, in a way similar to that of the commercial sols.…”

Section: Sol-gel Characterizationmentioning

confidence: 99%

Photocatalytic Activity of TiO2/AuNRs–SiO2 Nanocomposites Applied to Building Materials

et al. 2018

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In this work, the self-cleaning and photocatalytic properties of mesoporous TiO 2 /AuNRs-SiO 2 composites (namely UCA-TiO 2 Au) prepared by a simple and low-cost technique were investigated toward application in building materials. Mesoporous photocatalytic nanocomposites coating the surface of stone and other building materials are a very promising approach to address relevant questions connected with the increasing atmospheric pollution. We tested three types of preformed TiO 2 /AuNRs nanostructures in order to evaluate the effect of AuNRs on the photocatalytic activity of resulting coatings deposited on the surface of a popular building limestone. The resulting nanocomposites provide crack-free surface coatings on limestone, effective adhesion, improve the stone mechanical properties and impart hydrophobic and self-cleaning properties. Photocatalytic characterization involved the degradation of a target compound (Methylene blue; MB) under direct exposure to simulated solar light using TiO 2 P25 Evonik (TiO 2 P25) as a reference material. Moreover, these coatings upon irradiation by simulated solar light were successfully employed for the photocatalytic oxidation of carbon soot. The experimental results revealed that UCA-TiO 2 Au samples are the best performing coating in both MB bleaching and soot degradation.

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A novel TiO2–SiO2 nanocomposite converts a very friable stone into a self-cleaning building material

Cited by 124 publications

References 44 publications

New Consolidant-Hydrophobic Treatment by Combining SiO2 Composite and Fluorinated Alkoxysilane: Application on Decayed Biocalcareous Stone from an 18th Century Cathedral

New Consolidant-Hydrophobic Treatment by Combining SiO2 Composite and Fluorinated Alkoxysilane: Application on Decayed Biocalcareous Stone from an 18th Century Cathedral

NANOTECHNOLOGY IN THE CULTURAL HERITAGE - INFLUENCE OF NANOSPENSIONS ADOPTED BY NANOPARTICLES OF TiO2 FOR CLEANING THE SURFACE OF HISTORICAL PLASTERS

Photocatalytic Activity of TiO2/AuNRs–SiO2 Nanocomposites Applied to Building Materials

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