2018 |
Gomez-Jeria, J S; Clavijo, E; Carcamo, J J; Gutierrez, S An Infrared and Sem Study of the Margins of Some German Hyperinflation Postage Stamps Artículo de revista Research Journal of Pharmaceutical Biological and Chemical Sciences, 9 (2), pp. 870-892, 2018, ISSN: 0975-8585. Resumen | Enlaces | BibTeX | Etiquetas: 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 @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} } 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. |
Gomez-Jeria, J S; Clavijo, E; Gutierrez, S A Qualitative Infrared and Scanning Electron Microscopy Study of the Margins of Fourteen World Postage Stamps Artículo de revista Research Journal of Pharmaceutical Biological and Chemical Sciences, 9 (6), pp. 1719-+, 2018, ISSN: 0975-8585. Resumen | Enlaces | BibTeX | Etiquetas: archeology, cellulose, electron ft-ir infrared kaolinite, microscopy, paper philately, pigments, postage raman scanning sem, spectra, spectroscopy, stamps, xrf @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} } 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. |
2013 |
Aguayo, T; Garrido, C; Clavijo, E; Gomez-Jeria, J S; Monasterio, C A; Icaza, M; Moraga, F E; Campos-Vallette, M Raman and Surface Enhanced Raman Scattering of a Black Dyed Silk Artículo de revista Journal of Raman Spectroscopy, 44 (9), pp. 1238-1245, 2013, ISSN: 0377-0486. Resumen | Enlaces | BibTeX | Etiquetas: aromatic-hydrocarbons, art, dye, fibroin, gagags, microscopy, model, nmr polycyclic raman, resonance sers, silk, spectroscopy @article{RN153, title = {Raman and Surface Enhanced Raman Scattering of a Black Dyed Silk}, author = { T. Aguayo and C. Garrido and E. Clavijo and J.S. Gomez-Jeria and C.A. Monasterio and M. Icaza and F.E. Moraga and M. Campos-Vallette}, url = {/brokenurl#<Go to ISI>://WOS:000323784900005}, doi = {10.1002/jrs.4348}, issn = {0377-0486}, year = {2013}, date = {2013-01-01}, journal = {Journal of Raman Spectroscopy}, volume = {44}, number = {9}, pages = {1238-1245}, publisher = {2013 John Wiley & Sons, Ltd.}, abstract = {The Raman and surface enhanced Raman scattering (SERS) spectra of a black dyed silk sample (BDS) were registered. The spectral analysis was performed on the basis of Raman and SERS spectral data of isolated samples of Bombyx mori silk fibroin, its motif peptide component (GAGAGS) and the synthetic reactive black 5 dye (RB5). The macro FT-Raman spectrum of the silk sample is consistent with a silk II-Cp crystalline fraction of Bombyx mori silk fibroin; the SERS spectrum is highly consistent with conformational modifications of the fibroin due to the interactions with the Ag nanoparticles. The GAGAGS peptide sequence dominates the Raman spectrum of the silk. The SERS spectrum of the peptide suggests a random coil conformation imposed by the surface interaction; the serine residue in the new conformation is exposed to the surface. Quantum chemical calculations for a model of the GAGAGS-Ag surface predict a nearly extended conformation at the Ag surface. The Raman spectrum of the dye was analysed, and a complete band assignment was proposed; it was not possible to propose a preferential orientation or organization of the molecule on the metal surface. Quantum chemical calculations for a model of the dye interacting with a silver surface predict a rather coplanar orientation of the RB5 on the Ag metal surface. The Raman spectrum of the BDS sample is dominated by signals from the dye; the general spectral behaviour indicates that the dye mainly interacts with the silk through the sulphone (-SO2-) and sulphonate (-SO2-O-) groups. Besides the presence of dye signals, mainly ascribed to the sulphone and sulphonate bands, the SERS spectrum of the BDS sample also displays bands belonging to the amino acids alanine, glycine, serine and particularly tyrosine.}, keywords = {aromatic-hydrocarbons, art, dye, fibroin, gagags, microscopy, model, nmr polycyclic raman, resonance sers, silk, spectroscopy}, pubstate = {published}, tppubtype = {article} } The Raman and surface enhanced Raman scattering (SERS) spectra of a black dyed silk sample (BDS) were registered. The spectral analysis was performed on the basis of Raman and SERS spectral data of isolated samples of Bombyx mori silk fibroin, its motif peptide component (GAGAGS) and the synthetic reactive black 5 dye (RB5). The macro FT-Raman spectrum of the silk sample is consistent with a silk II-Cp crystalline fraction of Bombyx mori silk fibroin; the SERS spectrum is highly consistent with conformational modifications of the fibroin due to the interactions with the Ag nanoparticles. The GAGAGS peptide sequence dominates the Raman spectrum of the silk. The SERS spectrum of the peptide suggests a random coil conformation imposed by the surface interaction; the serine residue in the new conformation is exposed to the surface. Quantum chemical calculations for a model of the GAGAGS-Ag surface predict a nearly extended conformation at the Ag surface. The Raman spectrum of the dye was analysed, and a complete band assignment was proposed; it was not possible to propose a preferential orientation or organization of the molecule on the metal surface. Quantum chemical calculations for a model of the dye interacting with a silver surface predict a rather coplanar orientation of the RB5 on the Ag metal surface. The Raman spectrum of the BDS sample is dominated by signals from the dye; the general spectral behaviour indicates that the dye mainly interacts with the silk through the sulphone (-SO2-) and sulphonate (-SO2-O-) groups. Besides the presence of dye signals, mainly ascribed to the sulphone and sulphonate bands, the SERS spectrum of the BDS sample also displays bands belonging to the amino acids alanine, glycine, serine and particularly tyrosine. |
Diaz, C; Valenzuela, M L; Caceres, S; Diaz, R; O'dwyer, C Solvent and Stabilizer Free Growth of Ag and Pd Nanoparticles Using Metallic Salts/Cyclotriphosphazenes Mixtures Artículo de revista Materials Chemistry and Physics, 143 (1), pp. 124-132, 2013, ISSN: 0254-0584. Resumen | Enlaces | BibTeX | Etiquetas: annealing, derivatives, electron gold, mechanical-behavior, metals, microscopy, nanoparticles, nanorods organometallic palladium polyphosphazenes, precursors, properties, pyrolysis, shape-controlled solid-state surface synthesis, thermolytic transformation @article{RN146, title = {Solvent and Stabilizer Free Growth of Ag and Pd Nanoparticles Using Metallic Salts/Cyclotriphosphazenes Mixtures}, author = { C. Diaz and M.L. Valenzuela and S. Caceres and R. Diaz and C. O'dwyer}, url = {/brokenurl#<Go to ISI>://WOS:000327684100017}, doi = {10.1016/j.matchemphys.2013.08.034}, issn = {0254-0584}, year = {2013}, date = {2013-01-01}, journal = {Materials Chemistry and Physics}, volume = {143}, number = {1}, pages = {124-132}, publisher = {2013 Elsevier B.V.}, abstract = {Cyclotriphosphazene is used as a sacrificial solid-state template to synthesize a range of Ag and Pd nanoparticles with diverse geometries by thermal treatment using MLn/N3P3(O2C12H8)(3) mixtures. The Pd and Ag nanoparticles are synthesized by solid-state pyrolysis of AgPPh3[CF3SO3]/N3P3(O2C12H8)(3) and PdCl2/N3P3(O2C12H8)(3) mixtures with molar relationships of 1:1, 1:5 and 1:10 respectively, in air and at 800 degrees C. The morphology of the as-prepared nanoparticles is found to depend on the molar ratio of the precursor mixture, the preparation method and of the nature of the metal. Ag and Pd, microcrystals were thermally grown on Si from the respective 1:1 precursors while that metal foams were grown from 1:5 ratios precursors on SiO2 wafers. High resolution transmission electron microscopy investigations reveal in most cases small crystals of Pd. HRSTEM measurements indicate that the formation of the Pd and Ag nanoparticles occurs through a phase demixing and dewetting mechanism. This approach has potential to be a useful and facile method to prepare metallic nanoparticles without requiring solutions or surfactants for application in electronic, catalytic and sensor materials and devices.}, keywords = {annealing, derivatives, electron gold, mechanical-behavior, metals, microscopy, nanoparticles, nanorods organometallic palladium polyphosphazenes, precursors, properties, pyrolysis, shape-controlled solid-state surface synthesis, thermolytic transformation}, pubstate = {published}, tppubtype = {article} } Cyclotriphosphazene is used as a sacrificial solid-state template to synthesize a range of Ag and Pd nanoparticles with diverse geometries by thermal treatment using MLn/N3P3(O2C12H8)(3) mixtures. The Pd and Ag nanoparticles are synthesized by solid-state pyrolysis of AgPPh3[CF3SO3]/N3P3(O2C12H8)(3) and PdCl2/N3P3(O2C12H8)(3) mixtures with molar relationships of 1:1, 1:5 and 1:10 respectively, in air and at 800 degrees C. The morphology of the as-prepared nanoparticles is found to depend on the molar ratio of the precursor mixture, the preparation method and of the nature of the metal. Ag and Pd, microcrystals were thermally grown on Si from the respective 1:1 precursors while that metal foams were grown from 1:5 ratios precursors on SiO2 wafers. High resolution transmission electron microscopy investigations reveal in most cases small crystals of Pd. HRSTEM measurements indicate that the formation of the Pd and Ag nanoparticles occurs through a phase demixing and dewetting mechanism. This approach has potential to be a useful and facile method to prepare metallic nanoparticles without requiring solutions or surfactants for application in electronic, catalytic and sensor materials and devices. |
2018 |
An Infrared and Sem Study of the Margins of Some German Hyperinflation Postage Stamps Artículo de revista Research Journal of Pharmaceutical Biological and Chemical Sciences, 9 (2), pp. 870-892, 2018, ISSN: 0975-8585. |
A Qualitative Infrared and Scanning Electron Microscopy Study of the Margins of Fourteen World Postage Stamps Artículo de revista Research Journal of Pharmaceutical Biological and Chemical Sciences, 9 (6), pp. 1719-+, 2018, ISSN: 0975-8585. |
2013 |
Raman and Surface Enhanced Raman Scattering of a Black Dyed Silk Artículo de revista Journal of Raman Spectroscopy, 44 (9), pp. 1238-1245, 2013, ISSN: 0377-0486. |
Solvent and Stabilizer Free Growth of Ag and Pd Nanoparticles Using Metallic Salts/Cyclotriphosphazenes Mixtures Artículo de revista Materials Chemistry and Physics, 143 (1), pp. 124-132, 2013, ISSN: 0254-0584. |