Copper and silver nanocrystals in lustre lead glazes: Development and optical properties

Added value products are being developed in ceramic industry. Different optical effects as bright metallic shine or new functionalities as hydrophobicity or bactericide characteristics are the new properties searched on the tiles. In this study, we prepare glassy coatings for tiles based on copper pigment by a conventional industrial process. The obtained coatings present different aesthetical aspects, including bright metallic aspect which confers a high decorative value to the tile. Furthermore, these metallic coatings present hydrophobic properties with contact angles with water as high as 115° and also bactericide characteristics. Superficial microstructure and nanoparticles were found in the bactericide-hydrophobic samples, resembling the surface of hydrophobic leaf surfaces. This structure was formed by the crystallization of CuO nanoparticles as Tenorite due to the copper saturation of the glassy matrix at the surface of the coatings.

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“…2). A similar situation has been previously described for other metallic cations on ancient glazes [24].…”

Section: Resultssupporting

confidence: 83%

Inorganic hydrophobic coatings: Surfaces mimicking the nature

Reinosa

Romero

Rubia

et al. 2013

Ceramics International

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“…A great effort has been made in the last few years to understand the different steps involved in lustre production by means of replica preparation [42,43,47,49,[96][97][98] and the comparison of the achieved microstructures with those of artefacts produced at different periods in various workshops. However, it is obvious that modern techniques of firing are different from the older ones, especially regarding the heating fuel and duration of thermal cycles.…”

Section: Micro and Nanostructuresmentioning

confidence: 99%

The Use of Metal Nanoparticles to Produce Yellow, Red and Iridescent Colour, from Bronze Age to Present Times in Lustre Pottery and Glass: Solid State Chemistry, Spectroscopy and Nanostructure

Colomban

2009

JNanoR

154

128

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Abstract. The use of metal nanoparticles dispersed in an optically clear matrix by potters and glassmakers from the Bronze Age up to the present time is reviewed from the solid state chemistry and material science point of view. The nature of metal (gold, silver or copper), the importance of some other elements (Fe, Sn, Sb, Bi) added to control metal reduction in the glass in relation to the firing atmosphere (combined reducing oxidizing sequences, role of hydrogen and water) are considered in the light of ancient Treatises and recent analyses using advanced techniques (FIB-TEM, EXAFS,…) and classical methods (optical microscopy, UV-visible absorption). The different types of colour production, by absorption/reflection (red, yellow) or diffraction (iridescence) and the relationship between nanostructure (metal particle dispersion, layer stacking) and lustre colour are discussed. The very specific interaction between light and the metal nanoparticle makes Raman scattering a very useful "bottom up" technique to study the local glass structure around the metal particles as well as to detect incomplete metal reduction or residues tracing the preparation route, hence making it possible to differentiate between genuine artefacts and fakes.

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“…The addition of PbO reduces the diffusivity of copper and silver in the glass and consequently helps the development of more superficial and thinner luster layer containing a higher volume fraction of an often bimodal size distribution of larger nanoparticles. Although, there is no doubt that this complex nanostructure is responsible for the metal like appearance of luster, there is still controversy about which of the abovementioned factors is the most important: the presence of larger metal nanoparticles, 19 the high volume fraction of particles, 7,17,18 the bimodal particle size distribution, 20 or the alternation of layers with different thickness and volume fraction of particles. 21,22 In fact, red non-coppery luster layers produced on a lead free glaze were thick (800 nm) and formed by 10 nm copper nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Composition, nanostructure, and optical properties of silver and silver-copper lusters

Pradell

Pavlov

Gutiérrez

et al. 2012

Journal of Applied Physics

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Influence of alloy inhomogeneities on the determination by Raman scattering of composition and strain in Si1-xGex/Si(001) layers J. Appl. Phys. 112, 023512 (2012) Plasmon coupling in circular-hole dimers: From separation-to touching-coupling regimes J. Appl. Phys. 112, 013113 (2012) Correlation between reflectivity and resistivity in multi-component metallic systems Appl. Phys. Lett. 101, 011902 (2012) Ultrathin metallic coatings can induce quantum levitation between nanosurfaces Appl. Phys. Lett. 100, 253104 (2012) Transmittance and optical constants of Sr films in the 6-1220eV spectral range J. Appl. Phys. 111, 113533 (2012) Additional information on J. Appl. Phys. Lusters are composite thin layers of coinage metal nanoparticles in glass displaying peculiar optical properties and obtained by a process involving ionic exchange, diffusion, and crystallization. In particular, the origin of the high reflectance (golden-shine) shown by those layers has been subject of some discussion. It has been attributed to either the presence of larger particles, thinner multiple layers or higher volume fraction of nanoparticles. The object of this paper is to clarify this for which a set of laboratory designed lusters are analysed by Rutherford backscattering spectroscopy, transmission electron microscopy, x-ray diffraction, and ultraviolet-visible spectroscopy. Model calculations and numerical simulations using the finite difference time domain method were also performed to evaluate the optical properties. Finally, the correlation between synthesis conditions, nanostructure, and optical properties is obtained for these materials. V C 2012 American Institute of Physics. [http://dx

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Copper and silver nanocrystals in lustre lead glazes: Development and optical properties

Cited by 42 publications

References 19 publications

Inorganic hydrophobic coatings: Surfaces mimicking the nature

Inorganic hydrophobic coatings: Surfaces mimicking the nature

The Use of Metal Nanoparticles to Produce Yellow, Red and Iridescent Colour, from Bronze Age to Present Times in Lustre Pottery and Glass: Solid State Chemistry, Spectroscopy and Nanostructure

Composition, nanostructure, and optical properties of silver and silver-copper lusters

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