Study of color and structural changes in silver painted medieval glasses

Pérez-Villar, Sofía; Rubio, Juan; Oteo, J. L.

doi:10.1016/j.jnoncrysol.2007.10.008

Cited by 62 publications

(54 citation statements)

References 54 publications

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“…As noted for the model Eu-containing copper glass, the Raman signature of Cu° containing glass differs strongly from that of the host matrix : the relative intensity of the Si-O bending multiplet vs. the stretching is modified, i.e., the polymerisation index is displaced, indicating that the environment of the metal particle is different from the host matrix. Similar conclusions have been made by S. Pérez et al for silver-containing yellow glass [28]. Additional bands are observed when analysing the red layers : in many cases the signatures of haematite (-Fe 2 O 3 ) with main peaks at 225, 290, 410, 610 and 1310 cm -1 [128] and that of carbon (1350-1600 cm -1 doublet) [4] are observed.…”

Section: Figsupporting

confidence: 86%

“…Similar conclusions were drawn from Raman scattering both for Cu and Ag elements in lustre pottery [37] and red [13] or yellow glass [28]. The roughness of the lustre surface was evidenced by AFM [41] or by confocal optical measurements [22].…”

Section: +supporting

confidence: 70%

“…The transition from a highly connected tetrahedral structure (such as quartz and amorphous silica) to a weakly or un-connected tetrahedral units (such as CaSiO 3 wollastonites or lead-based glaze) as caused by the addition of fluxing agents is reflected in the Raman spectrum by modifications of the intensity of the Si-O stretching multiplet (centre of gravity ~950 to 1150 cm -1 ) vs. the bending one (centre of gravity ~500 to 600 cm -1 ) [88]. The relationship between the Raman index of polymerisation (Ip = A 500 /A 1000 with A being the area under the Raman band), the glass composition and the processing temperature is now well documented [28,37,88,89,92,96,[123][124][125][126][127]. For instance this has been used to classify silver-containing yellow stained glass replicas [28] and ancient red or yellow stained glasses [96,100]: for instance a clear relationship was established between the polymerization index, the Area of Q n components and the b* colour coordinate as a function of the silver content and its degree of reduction [28].…”

Section: Non-destructive Analysesmentioning

confidence: 99%

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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

151

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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Section: Figsupporting

confidence: 86%

Section: +supporting

confidence: 70%

Section: Non-destructive Analysesmentioning

confidence: 99%

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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

151

128

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“…Mediante espectroscopia Raman es posible analizar el proceso de amorfización superficial de los materiales vítreos ya que esta técnica permite detectar los diferentes grupos estructurales existentes en los vidrios tal y como han propuesto varios autores (14,17,18). Así, si se hace la deconvolución de los espectros Raman en la región 800-1200 cm -1 aparecen cinco bandas situadas en unos intervalos comprendidos entre 1250-1150 cm -1 , 1100 cm -1 , 1100-1050 cm , Q 2 , Q 1 y Q 0 , en donde Q indica el grupo SiO 4 y los superíndices el número de oxígenos puente o unidos a otro átomo de Si.…”

Section: Discussionunclassified

Aplicación de las espectroscopias IR/ATR y Raman al estudio de la superficie de vidrios sometidos a molturación

Pérez-Villar¹,

Tamayo²,

Mazo³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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El proceso de molienda de sílice vítrea y un vidrio convencional se ha estudiado mediante espectroscopias IR/ATR y Raman. A partir de los espectros obtenidos para diferentes tamaños de partícula se calcularon tanto las posiciones como las áreas de las bandas que aparecían en cada espectro. Utilizando los espectros Raman se ha hecho uso del denominado Índice de Polimerización (IP) el cual es indicativo del grado de despolimerización producido en la superficie de las partículas tras el proceso de molienda. Por otro lado, mediante los espectros IR/ATR y analizando las posiciones de las bandas de tensión simétrica y asimétrica de los enlaces Si-O-Si se ha podido seguir el citado proceso de molturación. Se ha observado, mediante ambas técnicas, como la superficie de las partículas se despolimeriza al disminuir el tamaño de partícula. Esta despolimerización es debida a la rotura de los enlaces Si-O-Si. Palabras clave: Raman, IR/ATR, molienda, despolimerización, sílice, vidrio.Application of the Raman and IR/ATR spectroscopies to the study of the glasses upon grinding.The grinding process of vítreous silica and a conventional glass has been studied by means of Raman and IR/ATR spectroscopies. By using the obtained spectra, the positions and areas of the different bands have been calculated. The Raman spectra have been analysed using the Polymerisation Index (PI) that indicates the depolymerization degree achieved on the particle surface after grinding. On the other hand, the IR/ATR spectra have been used to follow the positions of the symmetric and antisymmetric Si-O-Si bands. It has been observed that both techniques give similar results. These indicate that the depolymerisation degree increases with the grinding process. This depolymerisation is due to the broke of Si-O-Si bonds.Keywords: Raman, IR/ATR, grinding, depolymerisation, silica, glass.. INTRODUCCIóNEs bien conocido que los procesos de molturación de materiales cerámicos y vítreos dan lugar a que dichos materiales posean superficies muy diferentes, no solo en composición química respecto a la masa del material, sino también entre las distintas partículas según sea el alcance del grado de molienda (1,2,3). El conocer como es la composición o la estructura de cualquier material es de importancia fundamental tanto para muchos procesos tecnológicos como para la salud de los trabajadores que están en contacto con el material. Así por ejemplo, dada la importancia tecnológica del cuarzo en muchos procesos industriales (cerámicas, vidrio, materiales de construcción, fundiciones, silicio metálico, aleaciones férricas, etc.,) y el papel que puede jugar este material en la formación de lesiones pulmonares (silicosis) explican el por qué el estudio de su comportamiento durante los procesos de molienda haya sido objeto de un gran número de publicaciones (4). Por otro lado, en la industria de las fritas para pavimentos y revestimientos cerámicos, los procesos de molienda de dichas fritas implican que éstas puedan ser utilizadas en determinadas aplicaciones o bien para pro...

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“…In ancient times, metallic nano particles were used to color glasses, making colorful cups, potteries and windows [1,2,3,4]. A very famous example is the Lycurgus cup which shows different color when light passes through the cup in different ways.…”

Section: Introductionmentioning

confidence: 99%

Plasmon hybridization for real metals

2010

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Plasmon Hybridization in Real Metals by Kui BaoBy treating free electrons in metallic nanostructures as incompressible and irrotational fluid, Plasmon hybridization (PH) method can be used as a very useful tool in interpolating the electric magnetic behaviors of complex metallic nanostructures.Using PH theory and Finite Element Method (FEM), we theoretically investigated the optical properties of some complex nanostructrus induding coupled nanoparticle aggregates and nanowires.We investigated the plasmonic properties of a symmetric silver sphere heptamer and showed that the extinction spectrum exhibited a narrow Fano resonance. Using the plasmon hybridization approach and group theory we showed that this Fano resonance is caused by the interference of two bonding dipolar subradiant and superradiant plasmon modes of El u symmetry. We investigate the effect of structural symmetry breaking and show that the energy and shape of the Fano resonance can be tuned over a broad wavelength range. We show that the wavelength of the Fano resonance depends very sensitively on the dielectric permittivity of the surrounding media.Besides heptamer, we also used plasmon hybridization method and finite element method to investigate the plasmonic properties of silver or gold nano spherical clusters. For symmetric clusters, we show how group theory can be used to identify the microscopic nature of the plasmon resonances. For larger dusters, we show that narrow Fano resonances are frequently present in their optical spectra. As an example of asymmetric clusters, we demonstrate that clusters of four identical spherical particles support strong Fano-like interference. This feature is highly sensitive to the polarization of the incident electric field due to orientation-dependent coupling between particles in the cluster.~anowire plasmons can be launched by illumination at one terminus of the nanowire and emission can be detected at the other end of the wire. \Vith PH theory we can predict how the polarization of the emitted light depends on the polarization of the incident light. Depending on termination shape, a nanowire can serve as either a polarization-maintaining waveguide, or as a polarization-rotating, nanoscale halfwave plate. \Ve also investigated how the properties of a nearby substrate modify the excitation and propagation of plasmons in subwavelength silver wires.

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Study of color and structural changes in silver painted medieval glasses

Cited by 62 publications

References 54 publications

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

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

Aplicación de las espectroscopias IR/ATR y Raman al estudio de la superficie de vidrios sometidos a molturación

Plasmon hybridization for real metals

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