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Relevant bibliographies by topics / Pigment Spectroscopy

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Academic literature on the topic 'Pigment Spectroscopy'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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Journal articles on the topic "Pigment Spectroscopy"

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Wiggins, Marcie B., Jocelyn Alcántara-García, and Karl S. Booksh. "Characterization of copper-based pigment preparation and alteration products." MRS Advances 2, no. 63 (2017): 3973–81. http://dx.doi.org/10.1557/adv.2018.53.

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ABSTRACTCopper-based pigments are common in works of art that show signs of decay on green and blue areas and are frequently associated with the degradation of organic substrates and/or media (drying oils, cellulose, etc.). The exact causes of degradation remain unknown. This prompted us to study possible starting and degradation products of one especially reactive copper pigment, verdigris (copper acetate), as well as pigments of the same family (salt and soap greens). Preparation of pigments using historical methods was followed by spectroscopic and crystallographic characterization using Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Synthesis of verdigris and verdigris-like pigments resulted in a mixture of starting polymorphs of verdigris, including neutral and basic verdigris. With accelerated aging, pigments degraded to a polymorph of basic verdigris when not affected by organic media, whereas pigments on cellulosic substrates showed oxidized copper species. With this study, we are beginning to understand verdigris starting materials and highlight the complex interactions between pigments and substrates that influence pigment degradation pathways.

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Dupuis, Guillaume, Mady Elias, and Lionel Simonot. "Pigment Identification by Fiber-Optics Diffuse Reflectance Spectroscopy." Applied Spectroscopy 56, no. 10 (October 2002): 1329–36. http://dx.doi.org/10.1366/000370202760354803.

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Fiber-optics reflectance spectroscopy is used to identify pigments in pictorial layers of works of art thanks to a spectra database of dry powdered mineral pigments. Measurements are noninvasive, without any contact, and can be implemented in situ, without moving the work of art under investigation from its conservation place. The experimental device, using the special back-scattering configuration, is briefly presented. The protocol leading to the constitution of the spectra database of dry mineral pigments is described. Unlike other studies, this protocol has been developed to emphasize multiple scattering of light by elementary pigments in comparison with specular reflection on the surface of the sample. In these conditions, the diffuse reflectance spectrum is the label of the mineral pigment. The numerical processing of pigment identification is detailed. Both the influences of the roughness of the studied surface and of a possible varnish layer are taken into account when numerical identification is implemented. Several applications on patrimonial works of art are reported.

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Kougemitrou, I., G. Economou, J. Giovanopoulos, I. Baziotis, G. Leontakianakos, and V. Stathopoulos. "A mineralogical study of pigments used in two Iakovidis paintings: Verification of artwork authenticity using Raman micro-spectroscopy method." Bulletin of the Geological Society of Greece 47, no. 1 (September 5, 2013): 392. http://dx.doi.org/10.12681/bgsg.11014.

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For the purpose of the current study, we examined two paintings, an original and a fake one, entitled “Still life with grapes”, and claimed both to be created from the Greek Painter G. Iakovidis. The current Research Project has been carried out at the Centre Nikias, an innovative Research Centre specialised on certification, maintenance and restoration of art works. Raman spectroscopic analysis has been carried to verify the authenticity of the used pigments and also the originality of the two paintings. The Raman spectra acquired confirmed four different colours in both painting`s pigments: red, blue, white and yellow. For the first painting Cinnabar for the red pigment, Ultramarine for the blue pigment, White earths for the white pigment and Yellow ochre for the yellow pigment. In the second painting the colours used verified as synthetic pigments. We identified the presence of Cadmium red for the red colour, Cobalt blue for the blue pigment, Zinc white for the white and Cadmium yellow for the yellow one.

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Zhang, Yong, Xuening Fei, Lu Yu, Lingyun Cao, and Baolian Zhang. "Preparation and characterisation of silica supported organic hybrid pigments." Pigment & Resin Technology 43, no. 6 (November 3, 2014): 325–31. http://dx.doi.org/10.1108/prt-10-2013-0087.

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Purpose The purpose of the work reported in this paper is to prepare hybrid pigments fabricated by depositing pigment yellow 12 (PY12) on the surface of silica gel to improve the application performance of the resulting pigments. The particle size distribution, optical properties, thermal stability, water dispersibility and flowability of the pigments with and without silica gel modification were studied. Design/methodology/approach The hybrid pigments were synthesised with different amount of silica gel. The modified pigments were characterised by Fourier transforms infrared spectroscopy, X-ray diffraction, thermal analysis, scanning electron microscopy and transmission electron microscopy. Findings The particle size distribution of the modified pigments was found to have been altered significantly. This can be explained by the interaction between pigments and silica gel, which prevented self-aggregation of pigment particles and hence improved the properties of pigments. Research limitations/implications Only silica supports and pigment yellow 12 were evaluated. Other pigments could also be studied. Practical implications Modification of pigment particles with smaller particle size can increase the efficiency of the modified pigment, in terms of colour shade and tinting strength, due to better particle size distribution. Originality/value The paper demonstrates that inorganic core can prevent self-aggregation of pigment particles, and the application properties of such pigment depend on the resulting degree of dispersion of pigment particles.

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Gorgieva, Selestina, Darinka Fakin, and Alenka Ojstršek. "Confocal Fluorescence Microscopy as a Tool for Assessment of Photoluminescent Pigments Print on Polyester Fabric." TEKSTILEC 64, no. 1 (January 14, 2021): 16–24. http://dx.doi.org/10.14502/tekstilec2021.64.16-24.

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The size and distribution of the photoluminescent pigment particles within the selected binder may affect the quality and appearance of the final print significantly. Yet, the techniques for precise evaluation of size distri¬bution of the pigment particles within a 3D fabric space are rather limited, based on their intrinsic fluorescent properties. The presented work demonstrates a simple screen-printing process for the sustainable application of three different types of commercial fluorescent pigments on polyester (PES) fabric, using polydimethylsiloxane (PDMS) as a binder. A comprehensive toolbox was used to compare and study different commercial photo¬luminescent pigments and their corresponding prints, by means of size distribution and concentration effect of emission intensity, including Confocal Fluorescence Microscopy (CFM) and Scanning Electron Microscopy (SEM) in combination with complementary spectroscopic techniques, i.e. Energy Dispersive X-ray Spectroscopy (EDX) and Ultraviolet-visible (UV-vis) spectroscopy. The focus is on CFM utilised as a non-destructive tool, used for the evaluation of photoluminescent pigments´ spatial distribution within printing pastes, as well as on/within the PES fabrics.

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Wang, Quan, and W. E. Moerner. "Dissecting pigment architecture of individual photosynthetic antenna complexes in solution." Proceedings of the National Academy of Sciences 112, no. 45 (October 5, 2015): 13880–85. http://dx.doi.org/10.1073/pnas.1514027112.

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Oligomerization plays a critical role in shaping the light-harvesting properties of many photosynthetic pigment−protein complexes, but a detailed understanding of this process at the level of individual pigments is still lacking. To study the effects of oligomerization, we designed a single-molecule approach to probe the photophysical properties of individual pigment sites as a function of protein assembly state. Our method, based on the principles of anti-Brownian electrokinetic trapping of single fluorescent proteins, step-wise photobleaching, and multiparameter spectroscopy, allows pigment-specific spectroscopic information on single multipigment antennae to be recorded in a nonperturbative aqueous environment with unprecedented detail. We focus on the monomer-to-trimer transformation of allophycocyanin (APC), an important antenna protein in cyanobacteria. Our data reveal that the two chemically identical pigments in APC have different roles. One (α) is the functional pigment that red-shifts its spectral properties upon trimer formation, whereas the other (β) is a “protective” pigment that persistently quenches the excited state of α in the prefunctional, monomer state of the protein. These results show how subtleties in pigment organization give rise to functionally important aspects of energy transfer and photoprotection in antenna complexes. The method developed here should find immediate application in understanding the emergent properties of other natural and artificial light-harvesting systems.

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Lee, Hyun Soo, and Byung Ha Lee. "Synthesis of Forsterite Pigment for Underglaze Colors." Materials Science Forum 658 (July 2010): 109–12. http://dx.doi.org/10.4028/www.scientific.net/msf.658.109.

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The aim of the present investigations was to synthesize pigments based on Ni-doped forsterite (Mg2SiO4) for high temperature underglaze colors by ceramic route. In forsterite Mg2+ can be replaced by Fe2+, Ni2+, Co2+ ion since their ionic radious are close or coincide. NiO doped forsterite green pigments pigments were prepared by ceramic method from mixture of MgO and SiO2 and H3BO3 as mineralizer and the colour properties of the pigments was also investigated. In this experiment, very brilliant and fluorescent light green color hue of pigment was obtained at 1300°C for 3 hours. According to various firing condition, crystalline structure of pigments were chracterised by X-ray diffraction and FT-IR, Raman spectroscopy. And their color characterization were analized by UV-Vis spectroscopy on the ground of CIE L*a*b* measurement.

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Ren, Jie, Cunjin Gao, Jigang Wang, Yang Shen, Jilong Shi, Quanxiao Liu, and Wei Chen. "Non-invasive Optical Technical Identification of Red Pigments on Chinese Paper Notes." Coatings 11, no. 4 (April 1, 2021): 410. http://dx.doi.org/10.3390/coatings11040410.

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Red pigments with bright colors were widely used in ancient Chinese painted pottery, books, antiques, calligraphy, and paintings. Herein, red pigments of traditional paper notes were investigated by non-invasive optical technology in order to enrich the Chinese historical pigments knowledge base. The results of laser Raman spectroscopy tests on five paper notes clearly identified the inorganic mineral pigments including ocher and cinnabar. Infrared spectroscopy measurements indicated that an artificial synthetic magenta was employed as the organic pigment. Inorganic and organic red pigments were applied together on the same samples 2 and 5 which can be speculated to serve an anti-counterfeiting function. In addition, SEM-EDS analysis of sample 5 clearly showed that the red pigment was composed of lead oxides and ZnS was added as color modulator. Combined with the abovementioned non-invasive techniques, analysis of printed pigments can provide a feasible method to authenticate and conserve paper notes.

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Pronti, Lucilla, Giuseppe Capobianco, Margherita Vendittelli, Anna Candida Felici, Silvia Serranti, and Giuseppe Bonifazi. "Optimized Method for Mapping Inorganic Pigments by Means of Multispectral Imaging Combined with Hyperspectral Spectroscopy for the Study of Vincenzo Pasqualoni’s Wall Painting at the Basilica of S. Nicola in Carcere in Rome." Minerals 11, no. 8 (August 2, 2021): 839. http://dx.doi.org/10.3390/min11080839.

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Multispectral imaging is a preliminary screening technique for the study of paintings. Although it permits the identification of several mineral pigments by their spectral behavior, it is considered less performing concerning hyperspectral imaging, since a limited number of wavelengths are selected. In this work, we propose an optimized method to map the distribution of the mineral pigments used by Vincenzo Pasqualoni for his wall painting placed at the Basilica of S. Nicola in Carcere in Rome, combining UV/VIS/NIR reflectance spectroscopy and multispectral imaging. The first method (UV/VIS/NIR reflectance spectroscopy) allowed us to characterize pigment layers with a high spectral resolution; the second method (UV/VIS/NIR multispectral imaging) permitted the evaluation of the pigment distribution by utilizing a restricted number of wavelengths. Combining the results obtained from both devices was possible to obtain a distribution map of a pictorial layer with a high accuracy level of pigment recognition. The method involved the joint use of point-by-point hyperspectral spectroscopy and Principal Component Analysis (PCA) to identify the pigments in the color palette and evaluate the possibility to discriminate all the pigments recognized, using a minor number of wavelengths acquired through the multispectral imaging system. Finally, the distribution and the spectral difference of the different pigments recognized in the multispectral images, (in this case: red ochre, yellow ochre, orpiment, cobalt blue-based pigments, ultramarine and chrome green) were shown through PCA false-color images.

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Gorgieva, Selestina, Natalija Virant, and Alenka Ojstršek. "Complementary Assessment of Commercial Photoluminescent Pigments Printed on Cotton Fabric." Polymers 11, no. 7 (July 20, 2019): 1216. http://dx.doi.org/10.3390/polym11071216.

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The presented study focuses on photoluminescent pigments applied on cotton fabric by a screen-printed procedure using polydimethylsiloxane (PDMS) as a binder. Microscopic data depicts irregular shapes and relatively wide size distribution (3–80 µm) of pigments. Regarding composition, the Energy-Dispersive X-ray (EDX) and Fourier Transform Infrared (FTIR) spectroscopy data complement findings suggesting the presence of Eu-doped strontium aluminate in the yellow-green, calcium aluminate in the violet pigment, and metal oxides in the blue pigment. The optical properties of pigment-enriched PDMS-coated cotton fabric were assessed and reflectance intensity was found to be concentration-dependent only in the blue pigment. The luminescence decay data show that luminescence intensity decreased with the reduction of pigment concentration in the following order, yellow-green > blue > violet pigments. Relying on absorption and emission data of powdered pigments, the confocal microscopy enables visualization of the pigments’ distribution within a 3D image projection. This identifies the most homogeneous distribution in the case of the blue pigment, as well as the presence of a continuous fluorescing signal in the z projection when 5% pigment was used. This was, for the first time, presented as a powerful tool for non-destructive visualization of photoluminescent pigments’ spatial distribution when printed on textile (cotton) fabric. Finally, the photoluminescent PDMS coating demonstrates high washing and abrasion resistance, contributing to overall functionality of printed cotton fabrics when commercial types of pigments are applied.

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Dissertations / Theses on the topic "Pigment Spectroscopy"

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Nieder, Jana Berit [Verfasser]. "Single-molecule spectroscopy on pigment-protein complexes / Jana Berit Nieder." Berlin : Freie Universität Berlin, 2011. http://d-nb.info/102593881X/34.

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Boutzen, Jocelyn. "Contribution à la modélisation d’interface biologique par spectroscopie d’impédance : application au suivi de l’épithélium pigmenté de la rétine durant sa croissance et face à diverses perturbations." Thesis, Paris Est, 2019. http://www.theses.fr/2019PESC2044.

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Cette thèse porte sur l’étude de l’interface entre électrodes et cellules épithéliales de la rétine : l’épithélium pigmenté. Les cellules RPE (Retinal Pigment Epithelium) qui le constitue forment une monocouche qui à confluence est constituée de cellules de forme polygonale. Elles sont juxtaposées et en contact intime les unes avec les autres par la présence de jonctions serrées. Un épithélium pigmenté endommagé est souvent associé à des pathologies de la vision. La spectroscopie d’impédance est une méthode de mesure qui permet d’étudier de manière non destructive un milieu composé d’éléments diélectriques et conducteurs. Cette mesure s’applique particulièrement bien aux cellules épithéliales. On applique ceci à l’étude du tapis cellulaires. Les membranes cellulaires remplissent le rôle de milieu diélectrique alors que les milieux ioniques intra et extracellulaires peuvent être considérés conducteurs. On peut en première approche analyser le module de l’impédance mesurée à une fréquence donnée afin de suivre le développement des tissus. Par exemple dans le domaine des implants à électrodes les fréquences autour de 1 KHz sont couramment citées. On peut par la suite mesurer l’impédance dans une gamme de fréquence plus importante et appliquer un modèle composé de dipôles électriques aux mesures. L’analyse des paramètres extraits peut donner une interprétation plus fine de l’état du tapis cellulaire. Deux notions seront principalement abordées dans cette thèse. Tout d’abord l’étude de l’utilisation de l’élément à constante de phase (CPE) dans la représentation du tapis cellulaire. Ensuite dans le cadre de ce modèle on va étudier le tapis cellulaire face à différentes perturbations
This manuscript focuses on studying the interface between an electrode and epithelial cells of the retina: the Retinal Pigment Epithelium (RPE). The cells that are part of this epithelium develops until they form a monolayer of juxtaposed cells with close lateral contact involving the presence of tight junctions. A damaged epithelium is often associated with sight alterations.Impedance spectroscopy is a measurement method that allows to study materials containing both conducting and dielectric elements in a non–destructive way. We apply this technique to the RPE cells layer. Cells membranes are the dielectric part while the intra and extracellular mediums are the conductive parts of this material. In a first stage one can measure the impedance at a fixed frequency as a way to follow tissues development. As an example, the 1 KHz frequency is often considered in characterizing electrodes from implanted devices. One can also measure the impedance over a wider bandwidth and apply an electric model circuit to the data. The extracted parameters can give a better interpretation of the state of the cell layer. In this work, two part will be mainly investigated. First we will evaluate the use of a constant phase element in part of the electrical model describing the cell layer. Second, and considering the same model, we will observe the reaction of the model when the cells are subject to various perturbations

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Bonini, Nick. "Comparison of VNIR Derivative and Visible Fluorescence Spectroscopy Methods for Pigment Estimation in an Estuarine Ecosystem: Old Woman Creek, Huron, Ohio." Kent State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=kent1382838748.

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Hassan, Nik. "Vibrational spectroscopy in a forensic and archaeological context : forensic classification of biomaterials (ivory, bone, hair and fur) by Raman, FTIR, NIR spectroscopy using multivariate chemometrics analysis and the application of Raman spectroscopy for bioarchaeological degradaation and pigment analysis." Thesis, University of Bradford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.681237.

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Bessi, Matteo. "Development of new highly conjugated molecules and their application in the field of renewable energy and biomaterials." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF056/document.

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Ces dernières années, les matériaux fonctionnels hybrides ont commencé à être employés pour des applications de la haute technologie, allant des senseurs bio/médicaux, à la production d’énergie renouvelable. Pour cette raison, ils sont devenus le centre de plusieurs études dans le domaine des sciences des matériaux. Simultanément, des molécules conjuguées ont été examinée intensément à cause de leurs propriétés venant de leurs longs systèmes π, allant de la possibilité de conduire l’électricité, à leur capacité d’absorber la lumière dans une grande fenêtre spectrale. Le travail de cette thèse se concentre sur l’introduction de tels systèmes dans deux sortes de matériaux hybrides, les dispositifs photovoltaïques pour la production d’électricité (en particuliers les cellules solaires à pigment photosensible) et de carburants alternatifs (hydrogène), et pour les hydrogels biocompatibles sensibles aux stimuli (capables de conduire l’électricité et de réagir sous irradiation), et sur l’étude de leur influence sur les caractéristiques du matériau final
In recent years hybrid functional materials began to be employed in a series of technologically advanced applications spanning from bio/medical sensors, to renewable energy generation. For this reason, they became the focus of several studies in the field of materials science. At the same time, conjugated molecules have also been intensively investigated, due to the properties arising by the presence of long π-conjugated systems, from the possibility to conduct electricity to the ability to absorb light in a wide range of wavelengths. This PhD work focused on the introduction of such systems in two different kinds of hybrid materials, namely photovoltaic devices for the production of electricity (in particular Dye Sensitzed Solar Cells) and alternative fuels (hydrogen), and biocompatible stimuli-responsive hydrogels (capable to conduct electricity and to react upon irradiation), and on the study of their influence on the characteristics of the final material

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Goodall, Rosemary Anne. "Spectroscopic studies of Maya pigments." Queensland University of Technology, 2007. http://eprints.qut.edu.au/16958/.

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The Maya of Central America developed a complex society: among their many achievements they developed a writing system, complex calendar and were prolific builders. The buildings of their large urban centres, such as Copan in Honduras, were decorated with painted stucco, moulded masks, carving and elaborate murals, using a range of coloured pigments. In this study the paints used on the buildings of Copan and some ceramic sherds have been investigated, non-destructively, using micro-Raman spectroscopy, micro-ATR infrared spectroscopy, environmental scanning electron microscopy with energy dispersive X-ray analysis (ESEM-EDX) and FTIR-ATR imaging spectroscopy. The paint samples come from four buildings and one tomb covering three time periods in the four hundred year history of Copan. The main pigment used in the red paint on these samples was identified as haematite, and the stucco as a mixture of calcite particles dispersed throughout a calcite-based lime wash stucco. The composition and physical nature of the stucco changed through time, indicating a refining of production techniques over this period. A range of minor mineral components have been identified in each of the samples including rutile, quartz, clay and carbon. The presence and proportion of these and other minerals differed in each sample, leading to unique mineral signatures for the paint from each time period. Green and grey paints have also been identified on one of the buildings, the Rosalila Temple. The green pigment was identified as a celadonite-based green earth, and the grey pigment as a mixture of carbon and muscovite. The combination of carbon and mica to create a reflective paint is a novel finding in Maya archaeology. The high spatial resolution of the micro-FTIR-ATR spectral imaging system has been used to resolve individual particles in tomb wall paint and to identify their mineralogy from their spectra. This system has been used in combination with micro-Raman spectroscopy and ESEM-EDX mapping to characterize the paint, which was found to be a mixture of haematite and silicate particles, with minor amounts of calcite, carbon and magnetite particles, in a sub-micron haematite and calcite matrix. The blending of a high percentage of silicate particles into the haematite pigment is unique the tomb sample. The stucco in this tomb wall paint has finely ground carbon dispersed throughout the top layer providing a dark base for the paint layer. Changing paint mixtures and stucco composition were found to correlate with changes in paint processing techniques and building construction methods over the four hundred years of site occupation.

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Hebestreit, Niels. "Elektroaktive Hybridmaterialien auf der Basis von Metalloxidpartikeln und leitfähigen Polymerschichten." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1121087552415-79528.

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Ausgangspunkt dieser Arbeit war die Frage, inwieweit die zur Herstellung von Compositmaterialien aus leitfähigen Polymerfilmen (Polythiophen, Polypyrrol) und Metalloxidschichten (anodisch oxidiertes Titan, chemisch oxidiertes Silicium bzw. Aluminium) entwickelte Präparationsmethode auf die Herstellung hybrider Core - Shell - Partikel (Core: Metalloxidpartikel; Shell: leitfähiges Polymer) übertragbar ist. Die erfolgreiche Beschichtung dispergierter Oxidpartikel mit leitfähigen Poly- meren zeigte, dass nicht nur eine analoge Verfahrensweise (Adsorption des Monomers auf der Substratoberfläche und anschließende Zugabe des Oxidationsmittels) verwendet werden konnte, sondern dass bei der Pulverbeschichtung infolge der großen spezifischen Oberfläche der Materialien auch ohne Einsatz spezieller Haftvermittler, hervorragende Schichtqualitäten (hohe Haftfestigkeit, hoher Be- deckungsgrad) erreicht wurden, und die auf diesem Wege hergestellten Verbundmaterialien in Pulverform in beliebiger Menge, Partikelgröße und Zusam-mensetzung verfügbar waren. Der durch die Verkapselung der Oxidteilchen mit intrinsich leitfähigen Polymeren bewirkte enge Kontakt zwischen Polymer- und Oxidphase und die auf diesem Wege realisierte Oberflächenmodifizierung führte zu einem im Vergleich zu den reinen Komponenten wesentlich veränderten Eigenschaftsspektrum. Durch die Herstellung von Compositen waren die leitfähigen Polymere leichter dispergierbar, und konnten kathaphoretisch in guter Qualität, auch auf großen Substratflächen abgeschieden werden
Starting with the question about the possibility of producing composites based on conducting polymer films (polythiophene, polypyrrole) and metal oxide layers (anodically oxidized titanium, chemical oxidized silicon or aluminium) it was the goal of this work to transfer and modify this method for the preparation of hybrid core - shell - particles (core: metal oxide particle; shell: conducting polymer). By the successfully covering of dispersed oxide particles it was shown, that not only an analogous procedure (adsorption of the monomer on the substrate surface and the following addition of an oxidant) can be used, but that in the case of powder covering because of the high specific surface area of the oxide powders, outstanding layer qualities without using adhesion promotors can be produced. Following this way, powder-like compound materials can be ordered and designed in any quantity, particle size and composition. Through the encapsulation of the oxide particles with intrinsic conducting polymers a narrow contact between the polymer and the oxide phase and a surface modification were made by a very simple way. By this surface modification a totally different behaviour of the composites, compared to their components was realized. The producing of composites allowes a better dispersibility of conducting polymers and their cathaphoretically deposition with a good quality, also on larger substrate surfaces

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Cavalheri, Adriana Segato [UNESP]. "Identificação de pigmentos em artefatos arqueológicos via espectroscopia Micro-Raman." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/99698.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Neste trabalho foram estudadas amostras do Centro de Museologia, Antropologia e Arqueologia da FCT - UNESP de Presidente Prudente, o qual é coordenado pela professora Dra. Ruth Kunzli. As amostras foram caracterizadas por espectroscopia vibracional via espalhamento micro-Raman e a absorção no infravermelho com transformada de Fourier (FTIR), análise térmica por termogravimetria (TG) e energia dispersiva de raio-X (EDX). O objetivo principal do trabalho foi identificar os pigmentos utilizados na fabricação dos artefatos cerâmicos encontrados no sítio arqueológico Lagoa São Paulo - 02, Presidente Epitácio, SP, bem como os aditivos incorporados ao corpo cerâmico para entender como os arteftos foram confeccionados. Para o pigmento vermelho os resultados de Raman, FTIR, EDX e TG sugerem a utilização de hematia, um óxido de ferro consistente com o que podia ser encontrado nas rochas avermelhadas das encostas dos rios que eram desgastadas pela água. O pigmento preto apresenta bandas Raman características do carvão, provavelmente, este pigmento era encontrado na natureza como o produto da queima de material orgânico, possivelmente de origem vegetal. Para o pigmento branco, os espectros de FTIR e as curvas de TG sugerem o uso de caulim pela presença das bandas de absorção e do pico endotérmico em 550ºC aracterístico da caulinita, o que é consistente com os dados arqueológicos. Os aditivos identificados foram o carvão e o quartzo, sendo este último encontrado nas rochas presentes na região do sítio arqueológico. Tais aditivos são adicionados na confecção das cerâmicas para evitar o rachamento quando do cozimento, facilitar uma secagem homogênea e, ao mesmo tempo, reduzir a porosidade e a plasticidade. O processo de queima das amostras foi investigado via TG revelaram que todas elas passaram por processos de queima. Entretanto, os resultados sugerem que a amostra...
In this study samples from the Centro de Museologia, Antropologia e Arqueologia (CEMAARQ) of the UNESP Unip Estadual Paulista in Presidente Prudente, São Paulo State, Brazil, coordinated by professor Dra. Ruth Künzli, were investigated. The samples were characterized by vibrational spectroscopy via micro-Roman scattering and Fourier transform infrared absorption (FTIR), thermal analysis by termogravimetry (TG) and energy dispersive X-ray (EDX). The main objective was to identify the pigments used in the manufacture of ceramic artifacts found in the archaeological site Lagoa Sao Paulo - 02, Presidente Epitácio, SP, and the additives incorporated to the ceramic body to understand how the artifacts were made. For the red pigment of the results of Raman, FTIR, EDX e TG suggested the use of hematite, an iron oxide consistent with that found in the red rocks of the river banks eroded by water. The black pigment has Roman bands characteristic of charcol, probably, this pigment was found in nature as the product of burning organic material, possibly from vegetable. For the white pigment, the FTIR spectra and TG curves suggest the use of Kaolin by the presence of the absorption bands and the endothermic peak at 550ºC, characteristic of kaolinite, which is consistent with the archaeological data. The additives were identified as charcoal and quartz, the latter being found in rocks present in the archeological site. These additives are added in the manufacture of ceramics to prevent cracking when buring, to promote a homogeneous drying and to reduce porosity and plasticity. The burning process of the samples was investigated by TG and revealed that all of them were submitted to burning processes. However, the results suggest that the sample ... (Complete abstract click electronic access below)

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Hebestreit, Niels. "Elektroaktive Hybridmaterialien auf der Basis von Metalloxidpartikeln und leitfähigen Polymerschichten." Doctoral thesis, Technische Universität Dresden, 2004. https://tud.qucosa.de/id/qucosa%3A24529.

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Ausgangspunkt dieser Arbeit war die Frage, inwieweit die zur Herstellung von Compositmaterialien aus leitfähigen Polymerfilmen (Polythiophen, Polypyrrol) und Metalloxidschichten (anodisch oxidiertes Titan, chemisch oxidiertes Silicium bzw. Aluminium) entwickelte Präparationsmethode auf die Herstellung hybrider Core - Shell - Partikel (Core: Metalloxidpartikel; Shell: leitfähiges Polymer) übertragbar ist. Die erfolgreiche Beschichtung dispergierter Oxidpartikel mit leitfähigen Poly- meren zeigte, dass nicht nur eine analoge Verfahrensweise (Adsorption des Monomers auf der Substratoberfläche und anschließende Zugabe des Oxidationsmittels) verwendet werden konnte, sondern dass bei der Pulverbeschichtung infolge der großen spezifischen Oberfläche der Materialien auch ohne Einsatz spezieller Haftvermittler, hervorragende Schichtqualitäten (hohe Haftfestigkeit, hoher Be- deckungsgrad) erreicht wurden, und die auf diesem Wege hergestellten Verbundmaterialien in Pulverform in beliebiger Menge, Partikelgröße und Zusam-mensetzung verfügbar waren. Der durch die Verkapselung der Oxidteilchen mit intrinsich leitfähigen Polymeren bewirkte enge Kontakt zwischen Polymer- und Oxidphase und die auf diesem Wege realisierte Oberflächenmodifizierung führte zu einem im Vergleich zu den reinen Komponenten wesentlich veränderten Eigenschaftsspektrum. Durch die Herstellung von Compositen waren die leitfähigen Polymere leichter dispergierbar, und konnten kathaphoretisch in guter Qualität, auch auf großen Substratflächen abgeschieden werden.
Starting with the question about the possibility of producing composites based on conducting polymer films (polythiophene, polypyrrole) and metal oxide layers (anodically oxidized titanium, chemical oxidized silicon or aluminium) it was the goal of this work to transfer and modify this method for the preparation of hybrid core - shell - particles (core: metal oxide particle; shell: conducting polymer). By the successfully covering of dispersed oxide particles it was shown, that not only an analogous procedure (adsorption of the monomer on the substrate surface and the following addition of an oxidant) can be used, but that in the case of powder covering because of the high specific surface area of the oxide powders, outstanding layer qualities without using adhesion promotors can be produced. Following this way, powder-like compound materials can be ordered and designed in any quantity, particle size and composition. Through the encapsulation of the oxide particles with intrinsic conducting polymers a narrow contact between the polymer and the oxide phase and a surface modification were made by a very simple way. By this surface modification a totally different behaviour of the composites, compared to their components was realized. The producing of composites allowes a better dispersibility of conducting polymers and their cathaphoretically deposition with a good quality, also on larger substrate surfaces.

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Robinson, Julie. "Application of photodielectric techniques to study the photoactivity of titanium dioxide pigments." Thesis, Manchester Metropolitan University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321822.

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Books on the topic "Pigment Spectroscopy"

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A, Graf Josef. Struktur-Funktionsbeziehungen zwischen Lipidmatrix und Pigment-Protein-Komplexen in Thylakoidmembranen: Physiologische und fluoreszenzspektroskopische Untersuchungen zur Wirkung von Pyridazinonen, Cytokininen und Cerulenin bei Petunia hybrida. Stuttgart: [Biologisches Institut der Universität Stuttgart], 1987.

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T, Peters A., and Freeman H. S, eds. Analytical chemistry of synthetic colorants. London: Blackie Academic & Professional, 1995.

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Book chapters on the topic "Pigment Spectroscopy"

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van Oijen, A. M., M. Ketelaars, J. Köhler, T. J. Aartsma, and J. Schmidt. "The Electronic Structure of Single Photosynthetic Pigment-Protein Complexes." In Single Molecule Spectroscopy, 62–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56544-1_3.

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Foerstendorf, H., H. Scheer, E. Schäfer, and F. Siebert. "FT-IR Difference Spectroscopic Studies of the Photoreaction of the Light-Sensory Pigment of Higher Plant, Phytochrome." In Spectroscopy of Biological Molecules, 269–70. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0371-8_120.

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Richter, Martin F., Jürgen Baier, Richard J. Cogdell, Silke Oellerich, and Jürgen Köhler. "The Influence of Symmetry on the Electronic Structure of the Photosynthetic Pigment-Protein Complexes from Purple Bacteria." In Single Molecule Spectroscopy in Chemistry, Physics and Biology, 513–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02597-6_26.

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Vandenabeele, Peter, Anastasia Rousaki, Mafalda Costa, Luc Moens, and Howell G. M. Edwards. "CHAPTER 5. Pigments and Colourants." In Raman Spectroscopy in Archaeology and Art History, 61–67. Cambridge: Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/9781788013475-00061.

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Cubeddu, Rinaldo, Roberta Ramponi, Paola Taroni, Francesco Ghetti, and Francesco Lenci. "Time-gated Fluorescence Spectroscopy of Photoreceptor Pigments." In Biophysics of Photoreceptors and Photomovements in Microorganisms, 149–55. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-5988-3_11.

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Köhler, W., J. Friedrich, R. Fischer, and H. Scheer. "Low Temperature Spectroscopy Of Cyanobacterial Antenna Pigments." In Photosynthetic Light-Harvesting Systems. Organization and Function, edited by Hugo Scheer and Siegfried Schneider, 293–306. Berlin, Boston: De Gruyter, 1988. http://dx.doi.org/10.1515/9783110861914-030.

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Rotomskis, R. "Primary Photoprocesses in Biologically Active Pigments Related to Photosensitized Tumour Therapy." In Ultrafast Processes in Spectroscopy, 507–10. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5897-2_113.

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Lenci, Francesco. "Optical Absorption and Emission Spectroscopy of Photoreceptor Pigments." In Biophysics of Photoreceptors and Photomovements in Microorganisms, 125–38. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-5988-3_9.

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Brack, T. L., W. Gärtner, M. Sheves, M. Ottolenghi, and G. H. Atkinson. "Picosecond Time-Resolved Spectroscopy of Artificial Bacteriorhodopsin Pigments." In Springer Proceedings in Physics, 43–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84771-4_13.

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Madariaga, Juan Manuel. "Identification of Dyes and Pigments by Vibrational Spectroscopy." In Infrared and Raman Spectroscopy in Forensic Science, 383–99. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781119962328.ch7a.

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Conference papers on the topic "Pigment Spectroscopy"

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Betke, Alexander, Bernd Voigt, Heiko Lokstein, and Ralf Menzel. "Two-photon fluorescence excitation spectroscopy of photosynthetic pigments and pigment-protein complexes." In 12th European Quantum Electronics Conference CLEO EUROPE/EQEC. IEEE, 2011. http://dx.doi.org/10.1109/cleoe.2011.5943251.

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Trentelman, Karen, Catherine Schmidt Patterson, P. M. Champion, and L. D. Ziegler. "Raman Spectroscopy in Collections Research: Beyond Pigment Identification." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482485.

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Köhler, J., A. M. van Oijen, M. Ketelaars, C. Hofmann, M. Matsushita, T. J. Aartsma, and J. Schmidt. "Optical Spectroscopy of Individual Photosynthetic Pigment Protein Complexes." In Proceedings of 2000 International Conference. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811387_0015.

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Liu, H. Z., D. J. Xu, Roger D. Soloway, Y. Z. Zhang, Duan-Fu Xu, and JinGuang Wu. "Calcium bilirubinate intercalated calcite single crystal: evidence for microstructure of pigment gallstones." In Fourier Transform Spectroscopy: Ninth International Conference, edited by John E. Bertie and Hal Wieser. SPIE, 1994. http://dx.doi.org/10.1117/12.166729.

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Quinn, Geoffrey S., Fabio Visintini, and K. Olaf Niemann. "Considering the implications of species on pigment estimation from leaf spectroscopy." In 2012 4th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS). IEEE, 2012. http://dx.doi.org/10.1109/whispers.2012.6874276.

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Qinli Yin and Shuqiang Lv. "Spectral unmixing of mineral pigment mixture by using derivative of ratio spectroscopy." In 2016 4th International Workshop on Earth Observation and Remote Sensing Applications (EORSA). IEEE, 2016. http://dx.doi.org/10.1109/eorsa.2016.7552791.

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Centeno, Silvia, Julie Arslanoglu, Dorothy Mahon, Charlotte Hale, P. M. Champion, and L. D. Ziegler. "Investigation of Artists’ Working Practice, Surface Texture, and Pigment Color Changes in Traditional Oil Paintings by Raman Spectroscopy." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482488.

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Grigoryeva, Natalia Y., and Sofia A. Ivanova. "Fluorescence spectroscopy and confocal microscopic spectroscopy for investigation of structure and functioning of natural pigment-protein complexes for biosensorics." In PROCEEDINGS OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN MECHANICAL AND MATERIALS ENGINEERING: ICRTMME 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0018501.

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Ustin, S., G. Asner, J. Gamon, K. Huemmrich, S. Jacquemoud, M. Schaepman, and P. Zarco-Tejada. "Retrieval of Quantitative and Qualitative Information about Plant Pigment Systems from High Resolution Spectroscopy." In 2006 IEEE International Symposium on Geoscience and Remote Sensing. IEEE, 2006. http://dx.doi.org/10.1109/igarss.2006.517.

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Delaney, John K., Jason G. Zeibel, Mathieu Thoury, Roy Littleton, Kathryn M. Morales, Michael Palmer, and E. René de la Rie. "Visible and infrared reflectance imaging spectroscopy of paintings: pigment mapping and improved infrared reflectography." In SPIE Europe Optical Metrology, edited by Luca Pezzati and Renzo Salimbeni. SPIE, 2009. http://dx.doi.org/10.1117/12.827493.

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Reports on the topic "Pigment Spectroscopy"

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Buck, D. R. Theoretical Simulations and Ultrafast Pump-probe Spectroscopy Experiments in Pigment-protein Photosynthetic Complexes. Office of Scientific and Technical Information (OSTI), September 2000. http://dx.doi.org/10.2172/764683.

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