Publicaciones 2011-2020

@article{RN411,
title = {An Infrared and Sem Study of the Margins of Some German Hyperinflation Postage Stamps},
author = { J.S. Gomez-Jeria and E. Clavijo and J.J. Carcamo and S. Gutierrez},
url = {/brokenurl#<Go to ISI>://WOS:000432267600105},
issn = {0975-8585},
year = {2018},
date = {2018-01-01},
journal = {Research Journal of Pharmaceutical Biological and Chemical Sciences},
volume = {9},
number = {2},
pages = {870-892},
abstract = {Infrared spectroscopy and scanning electron microscopy (SEM) studies were performed on the margins (the area without printed colors) of a set of German postage stamps dated 1923 and corresponding to the hyperinflationary period of economy. SEM results showed the presence of Al, Si, Zn and S in the samples, but in different combinations. Sulfur is considered to be a contaminant. The Al-Si combination is credited to kaolinite, Zn to ZnO and unaccompanied Al possibly to Al2O3. Several experimental IR bands of kaolinite agree with the suggestion of its existence in some stamps. In the case of Al and Zn alone we have supposed that, with the passing of time and with the help of moisture, AlOH and ZnOH were formed in a quantity allowing detecting some of the metal- OH bands by IR spectroscopy. On the basis of previous infrared experimental results on Al and Zn hydroxides we assigned some IR bands to the OH groups bonded to these metals. Our results indicate that it is highly probable that the paper used to print these postage stamps was originated in more than one paper mill.},
keywords = {archeology, archeophilately, cellulose, database, electron ft-ir germany, hyperinflation, infrared inks kaolinite, microscopy, oxides, pigments, postage raman scanning sem, spectra, spectral spectroscopy, stamps, white zinc},
pubstate = {published},
tppubtype = {article}
}

@article{RN415,
title = {A Qualitative Infrared and Scanning Electron Microscopy Study of the Margins of Fourteen World Postage Stamps},
author = { J.S. Gomez-Jeria and E. Clavijo and S. Gutierrez},
url = {/brokenurl#<Go to ISI>://WOS:000449630700274},
issn = {0975-8585},
year = {2018},
date = {2018-01-01},
journal = {Research Journal of Pharmaceutical Biological and Chemical Sciences},
volume = {9},
number = {6},
pages = {1719-+},
abstract = {Fourteen heavily damaged postage stamps were chosen for an infrared and scanning electron microscopy (SEM) characterization of their non-printed margins. The results show the presence of kaolinite used as filler in all but two samples. These last two contain aluminum (with an Al-OH moiety). One stamp seems to contain barium in the form of sulfate. One stamp contains lead in an unknown chemical compound. All these results were incorporated into a database for future analysis. Quantum chemical calculations of diverse large models of cellulose seem absolutely necessary for the IR band assignments.},
keywords = {archeology, cellulose, electron ft-ir infrared kaolinite, microscopy, paper philately, pigments, postage raman scanning sem, spectra, spectroscopy, stamps, xrf},
pubstate = {published},
tppubtype = {article}
}

@article{RN408,
title = {Toxic Pigment in a Capacocha Burial: Instrumental Identification of Cinnabar in Inca Human Remains from Iquique, Chile},
author = { B. Arriaza and J.P. Ogalde and M. Campos-Vallette and C. Paipa and P. Leyton and N. Lara},
url = {/brokenurl#<Go to ISI>://WOS:000449888500012},
doi = {10.1111/arcm.12392},
issn = {0003-813x},
year = {2018},
date = {2018-01-01},
journal = {Archaeometry},
volume = {60},
number = {6},
pages = {1324-1333},
abstract = {We report on the analysis of a red pigment found in a lavish Inca burial from Cerro Esmeralda, Chile, associated with the human sacrifice of two young girls. The outcome shows that the red pigment is mainly cinnabar, with 95% of HgS content. Cinnabar is rarely found in the archaeological record of Chile. Thus, we propose that our results are another line of evidence supporting Iquique's Cerro Esmeralda inhumation as a unique Inca ritual. It was a special lower-elevation capacocha burial, most probably undertaken to politically and symbolically incorporate the coastal people into the Tawantinsuyo Empire.},
keywords = {ancient cerro coast esmeralda, exposure, hematite, insight, mercury mercury, mortuary nasca, pigments, poisoning, pottery, raman red rituals, sem, soils, spectroscopy},
pubstate = {published},
tppubtype = {article}
}

@article{marcaida2017optimization,
title = {Optimization of Sample Treatment for the Identification of Anthraquinone Dyes by Surface-Enhanced Raman Spectroscopy},
author = { I. Marcaida and M. Maguregui and H. Morillas and C. Garcia-Florentino and V. Pintus and T. Aguayo and M. Campos-Vallette and J. Madariaga},
url = {/brokenurl#<Go to ISI>://WOS:000395057500024},
doi = {10.1007/s00216-016-0169-6},
issn = {1618-2642},
year = {2017},
date = {2017-01-01},
journal = {Analytical and Bioanalytical Chemistry},
volume = {409},
number = {8},
pages = {2221-2228},
abstract = {The study and characterization of old artifacts such as pigments requires the use of techniques that need a small amount of sample to perform the analysis because of the high value of these samples. In recent years, organic molecules such as anthraquinone dyes have been identified by surface-enhanced Raman spectroscopy (SERS). However, different sample treatments must be applied to isolate the organic dye from the mordant, which produces great fluorescence in the Raman measurements. In this work, optimization of sample treatment for the SERS analysis of anthraquinone dyes was performed. Sample mass, the organic solvent, and its volume were optimized and different slide materials and excitation lasers were compared to choose the best conditions for the identification of the dyes. The optimization of sample treatment resulted in 5 mg of sample as the optimum amount. Further, two consecutive extractions with 0.5 mL of ethyl acetate was the best option for the extraction of the dye. A quartz slide was used instead of a glass slide to reduce background signal, and an excitation laser of 532 nm offers better results than one of 785 nm. The optimized method was applied to the characterization of the dyes used in Pompeian pink and purple lake pigments. Alizarin and purpurin anthraquinone dyes, obtained from madder lake, were identified as the organic colorants. The SERS results were confirmed by those obtained by means of UV-visible spectroscopy.},
keywords = {anthraquinone, dyestuffs, extraction, lake lake, liquid-liquid madder nanoparticles, pigment, pigments, purple, raman scattering, sers, silver, spectroscopy, surface-enhanced},
pubstate = {published},
tppubtype = {article}
}

@article{RN370,
title = {Raman Identification of Pigments in Wall Paintings of the Colonial Period from Bolivian Churches in the Ruta De La Plata},
author = { C. Rua and M. Sepulveda and S. Gutierrez and J.J. Carcamo and J. Surco-Luque and M. Campos-Vallette and F. Guzman and P. Conti and M. Pereira},
url = {/brokenurl#<Go to ISI>://WOS:000428811100008},
issn = {1974-4951},
year = {2017},
date = {2017-01-01},
journal = {Conservation Science in Cultural Heritage},
volume = {17},
pages = {117-137},
abstract = {Micro-Raman spectroscopy was used to analyze and identify pigments and determine the palette of color in wall paintings from four churches of the Colonial Period, in the Bolivian highlands. The ancient churches Santiago de Callapa, Curahuara de Carangas, Nuestra Senora de Copacabana de Andamarca and San Jose de Soracachi were constructed during the 17th and 18th centuries, around the important colonial Ruta de la Plata, between Potosi city and Arica harbor on the Paciic coast of South America. Most pigments used in the wall paintings correspond to inorganic minerals as well as to organic colorants. Fully chlorinated copper phthalocyanine (green), copper phthalocyanine (blue), beta-naphthol (yellow) and benzoimidazolone (red), were identiied in the corresponding colored areas suggesting subsequent recent interventions or restorations. Ground layer materials were also characterized. The present results allow for discussion of the pictorial techniques used in the Andean highland during the colonial period and allow conservators and restorers to make important decisions regarding the type of intervention to perform in the case of these important historical and patrimonial monuments.},
keywords = {ancient, andean art, artworks, breakdown churches, colonial complexes, corrosion, hematite, induced painted paintings, pigments, raman spectra, spectroscopy, sulfate wall},
pubstate = {published},
tppubtype = {article}
}

@article{RN263,
title = {Vibrational Spectroscopy for the Study of Chilean Cultural Heritage},
author = { M. Campos-Vallette and T. Aguayo},
url = {/brokenurl#<Go to ISI>://WOS:000356922100001},
doi = {10.1186/s40494-015-0047-0},
issn = {2050-7445},
year = {2015},
date = {2015-01-01},
journal = {Heritage Science},
volume = {3},
abstract = {Background: Natural and synthetic colouring products along with its associated supporting materials have been studied in several expressions of the Chilean cultural heritage using vibrational spectroscopy. These expressions include archaeological remains as well as works of art., Results: Among the materials studied so far we can count pigments found in archaeological sites from the north of Chile, in plaster (wall paintings) and in polychrome (beams), and dyes mainly related to added components on historic silk textiles. Identification of materials resulted to be relevant to know about Chilean culture through history., Conclusions: The vibrational knowledge obtained contributes to give solid data as a complement to the different information aspects collected by conservation professionals involved in the characterization and conservation procedures of cultural heritage and also it gives us the opportunity to share knowledge and to give value to objects that not always are of the public domain.},
keywords = {art, enhanced ft-raman, identification, iron-oxides, micro-raman, microspectroscopy paintings, pigments, raman-scattering, spectra},
pubstate = {published},
tppubtype = {article}
}