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{RN397,
title = {Solid-State Synthesis of Lnocl/Ln(2)O(3) (Ln = Eu, Nd) by Using Chitosan and Ps-Co-P4vp as Polymeric Supports},
author = { C. Diaz and D. Carrillo and R. De La Campa and A.P. Soto and M.L. Valenzuela},
url = {/brokenurl#<Go to ISI>://WOS:000451031200013},
doi = {10.1016/j.jre.2018.03.031},
issn = {1002-0721},
year = {2018},
date = {2018-01-01},
journal = {Journal of Rare Earths},
volume = {36},
number = {12},
pages = {1326-1332},
publisher = {2018 Chinese Society of Rare Earths. Published by Elsevier B.V.},
abstract = {A series of lanthanide materials of type LnOCl or Ln(2)O(3) (Ln = Eu, Nd) were successfully prepared via a convenient and straightforward two-step procedure. Firstly, and by using chitosan and PS-co-P4VP as polymeric supports, macromolecular complexes of type chitosan LnCl(3) and PS-co-P4VP center dot LnCl(3) were prepared. These macromolecular complexes were treated in solid state at 800 degrees C under air, leading to the corresponding LnOCl or Ln(2)O(3) materials (Ln = Eu, Nd) with moderate to good yields. The nature of the as-prepared lanthanide materials (LnCl and/or Ln(2)O(3)) is strongly influenced by the polymeric template (i.e., chitosan or PS-co-P4VP), the lanthanide salt precursor, and the polymer/lanthanide molar ratio. Thus, when chitosan center dot LnCl(3) and PS-co-P4VP center dot EuCl3 are used as macromolecular precursors, a mixture of crystalline phases o f both EuOCl and Eu2O3 are obtained. However, when chitosan center dot NdCl3 and PS-co-P4VP center dot NdCl3 are used, a sole pure crystalline phase of NdOCl is obtained. The nanostructured lanthanide materials were characterized by means of XRD (X-ray diffraction of powder), SEM, EDS, TEM, and HRTEM. The luminescent spectra of the as-prepared EuOCl/Eu2O3 mixture materials show an emission pattern whose intensity is strongly influenced by the nature of the polymeric precursor, as well as on the metal/polymer molar ratios.},
keywords = {earths, euocl/eu2o3, lanthanide, lanthanides, luminescence, method, nanocrystals, ndocl, oxides, rare scale solventless supracrystals},
pubstate = {published},
tppubtype = {article}
}

@article{RN302,
title = {Molybdenum Trioxide Thin Films Doped with Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering},
author = { C. Castillo and G. Buono-Core and C. Manzur and N. Yutronic and R. Sierpe and G. Cabello and B. Chornik},
url = {/brokenurl#<Go to ISI>://WOS:000378145500014},
doi = {10.4067/S0717-97072016000100014},
issn = {0717-9707},
year = {2016},
date = {2016-01-01},
journal = {Journal of the Chilean Chemical Society},
volume = {61},
number = {1},
pages = {2816-2820},
abstract = {Gold nanoparticles (AuNPs) were deposited by DC-magnetron sputtering onto molybdenum trioxide (MoO3) thin films grown by Photochemical Metal-Organic Deposition (PMOD) on Si(100) and borosilicate glass substrates. The chemical, optical and morphology properties of the films were studied by UV/Vis Spectroscopy, Scanning Electron Microscopy (SEM), X-Ray Photoelectron Spectroscopy (XPS), and X-Ray Diffraction (XRD). SEM revealed that AuNPs formed after 5 s of sputtering. AuNPs are spherical and have both an average diameter of 18 nm and a relatively narrow size distribution. As the deposition time increases, larger structures are formed by an aggregation of AuNPs. XPS studies of the AuNP/MoO3 films on Si(100) showed the presence of Mo(VI) and Mo(V), which indicated that the films were primarily non-stoichiometric molybdenum oxides. The occurrence of oxygen vacancies in the substrate play an important role to stabilize the AuNPs.},
keywords = {catalysis, diffraction, films, moo3, nanostructures, optical-properties, oxidation, oxide-films, oxides, photoelectron resonance, selective size, spectroscopy, sputtering, support, surface-plasmon temperature, thin x-ray xps},
pubstate = {published},
tppubtype = {article}
}

@article{RN264,
title = {Micro-Raman Spectral Identification of Manganese Oxides Black Pigments in an Archaeological Context in Northern Chile},
author = { M. Sepulveda and S. Gutierrez and M. Campos-Vallette and V.G. Standen and B.T. Arriaza and J.J. Carcamo},
url = {/brokenurl#<Go to ISI>://WOS:000362260500001},
doi = {UNSP 32, 10.1186/s40494-015-0061-2},
issn = {2050-7445},
year = {2015},
date = {2015-01-01},
journal = {Heritage Science},
volume = {3},
abstract = {The micro-Raman spectroscopy was used to identify manganese oxides, pyrolusite, manganite and cryptomelane in archaeological sites in northern Atacama Desert, Chile. The present micro-Raman data allow us to compare and expand the origins of raw materials used by archaic groups of the Atacama Desert. In the Andean highlands, pyrolusite and manganite were identified while in the coastal lowlands manganite and cryptomelane were found. The present results complement the data obtained from the lithic materials and rock art painting analyses pointing to a better understanding of the daily life of ancient populations and minerals use in this region.},
keywords = {archaeological art, atacama black contexts, desert, diagnosis, manganese micro-raman minerals, model, oxides, pigment, rock site spectroscopy},
pubstate = {published},
tppubtype = {article}
}