Miguel, C., J. V. Pinto, M. Clarke, and M. J. Melo,
"The alchemy of red mercury sulphide: The production of vermilion for medieval art",
Dyes and Pigments, vol. 102, pp. 210-217, 2014.
AbstractVermilion red, mercury sulphide (α-HgS), was one of the most important reds in art and its use as a pigment dates back to Antiquity. In medieval Europe, it could be mined as cinnabar, or produced as vermilion by heating mercury with sulphur. This work aims to study the production of synthetic vermilion as a medieval pigment and to confirm which was the source (mineral or artificial) of the reds used in Portuguese medieval illuminations. The production of synthetic vermilion was based on the process described in the Judaeo-Portuguese medieval treatise “The book on how to make colours”, using materials and technologies as close as possible to the medieval ones. The reaction mechanism was studied by following the heating process by X-ray diffraction, and it was possible to conclude that the transformation from black cubic β-HgS into red hexagonal α-HgS is a solid-state phase transition, occurring at 235 °C. This result is contrary to what published in technical art literature, in which this process is described as a sublimation. Moreover, Scanning Electron Microscopy evidenced a sinterization effect on the artificial vermilion, not found in medieval original samples nor in paints prepared with mineral cinnabar from Almadén (Spain). Red mercury sulphide, natural and synthetic, was then prepared as a parchment-glue paint and compared to proteinaceous red paints from 12th–13th century miniatures produced in important medieval monasteries, previously fully characterized by a multi-analytical approach (μ-Energy dispersive X-ray fluorescence, μ-Fourier Transform Infrared Spectroscopy, Raman microscopy). A comparative Electron probe microanalysis of the red paints point to a mineral provenance for medieval vermilion found in Portuguese illuminations.
Pinto, J. V., M. M. Cruz, R. C. da Silva, N. Franco, A. Casaca, E. Alves, and M. Godinho,
"Anisotropic ferromagnetism induced in rutile single crystals by Co implantation",
European Physical Journal B, vol. 55, issue 3, pp. 253-260, 2007.
Abstractn/a
Casimiro, M. H., A. G. Silva, J. V. Pinto, A. M. Ramos, J. Vital, and L. M. Ferreira,
"Catalytic poly(vinyl alcohol) functionalized membranes obtained by gamma irradiation",
Radiation Physics and Chemistry, vol. 81, issue 9, pp. 1314-1318, 2012.
Abstractn/a
Savoini, B., D. Caceres, R. Gonzalez, Y. Chen, J. V. Pinto, R. C. da Silva, and E. Alves,
"Copper nanocolloids in MgO crystals implanted with Cu ions",
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, vol. 218, pp. 148-152, 2004.
Abstractn/a
Tardio, M., R. Ramirez, R. Gonzalez, J. V. Pinto, R. C. da Silva, E. Alves, and Y. Chen,
"Electrical conductivity of as-grown and oxidized MgO : Li crystals implanted with Li ions",
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, vol. 218, pp. 164-169, 2004.
Abstractn/a
Pereira, S., A. Gonçalves, N. Correia, J. Pinto, L. Í. Pereira, R. Martins, and E. Fortunato,
"Electrochromic behavior of NiO thin films deposited by e-beam evaporation at room temperature",
Solar Energy Materials and Solar Cells, vol. 120, Part A, pp. 109-115, 2014.
AbstractIn this work we report the role of thickness on electrochromic behavior of nickel oxide (NiO) films deposited by e-beam evaporation at room temperature on ITO-coated glass. The structure and morphology of films with thicknesses between 100 and 500 nm were analyzed and then correlated with electrochemical response and transmittance modulation when immersed in 0.5 M LiClO4–PC electrolyte. The NiO exhibits an anodic coloration, reaching for the thickest film a transmittance modulation of 66% between colored and bleached state, at 630 nm, with a color efficiency of 55 cm2 C−1. Very fast switch between states was obtained, where coloration and bleaching times are 3.6 s cm−2 and 1.4 s cm−2, respectively.
Raiola, F., P. Migliardi, G. Gyurky, M. Aliotta, A. Formicola, R. Bonetti, C. Broggini, L. Campajola, P. Corvisiero, H. Costantini, J. Cruz, A. D'Onofrio, Z. Fulop, G. Gervino, L. Gialanella, A. Guglielmetti, G. Imbriani, C. Gustavino, A. P. Jesus, M. Junker, R. W. Kavanagh, P. G. P. Moroni, A. Ordine, J. V. Pinto, P. Prati, V. Roca, J. P. Ribeiro, D. Rogalla, C. Rolfs, M. Romano, F. Schumann, D. Schurmann, E. Somorjai, F. Strieder, F. Terrasi, H. P. Trautvetter, and S. Zavatarelli,
"Enhanced electron screening in d(d, p)t for deuterated Ta",
European Physical Journal A, vol. 13, issue 3, pp. 377-382, 2002.
Abstractn/a
Ribeiro, J. P., A. P. Jesus, B. Braizinha, J. Cruz, R. Mateus, and J. V. Pinto,
"Experimental study of the F-19(p,alpha gamma)O-16 reaction",
Nuclear Physics A, vol. 688, issue 1-2, pp. 468C-471C, 2001.
Abstractn/a
Borges, R. P., J. V. Pinto, R. C. da Silva, A. P. Goncalves, M. M. Cruz, and M. Godinho,
"Ferromagnetism in ZnO doped with Co by ion implantation",
Journal of Magnetism and Magnetic Materials, vol. 316, issue 2, pp. E191-E194, 2007.
Abstractn/a
Casella, C., H. Costantini, A. Lemut, B. Limata, R. Bonetti, C. Broggini, L. Campajola, P. Corvisiero, J. Cruz, A. D'Onofrio, A. Formicola, Z. Fulop, G. Gervino, L. Gialanella, A. Guglielmetti, C. Gustavino, G. Gyurky, G. Imbriani, A. P. Jesus, M. Junker, A. Ordine, J. V. Pinto, P. Prati, J. P. Ribeiro, V. Roca, D. Rogalla, C. Rolfs, M. Romano, C. Rossi-Alvarez, F. Scheumann, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H. P. Tratuvetter, S. Zavatarelli, and L. Collaboration,
"First measurement of the d(p, gamma)He-3 cross section down to the solar Gamow peak",
Nuclear Physics A, vol. 706, issue 1-2, pp. 203-216, 2002.
Abstractn/a
Cruz, M. M., R. C. da Silva, J. V. Pinto, R. G. Gonzalez, E. Alves, and M. Godinho,
"Magnetic behavior of Co and Ni implanted MgO",
Journal of Magnetism and Magnetic Materials, vol. 272, pp. 840-842, 2004.
Abstractn/a
Pinto, J. V., M. M. Cruz, R. C. da Silva, E. Alves, R. Gonzalez, and M. Godinho,
"Magnetic nanoscale aggregates of cobalt and nickel in MgO single crystals",
European Physical Journal B, vol. 45, issue 3, pp. 331-338, 2005.
Abstractn/a
Pinto, J. V., M. M. Cruz, R. C. da Silva, E. Alves, and M. Godinho,
"Magnetic properties of TiO2 rutile implanted with Ni and Co",
Journal of Magnetism and Magnetic Materials, vol. 294, issue 2, pp. E73-E76, 2005.
Abstractn/a
Casella, C., H. Costantini, A. Lemut, B. Limata, D. Bemmerer, R. Bonetti, C. Broggini, L. Campajola, P. Cocconi, P. Corvisiero, J. Cruz, A. D'Onofrio, A. Formicola, Z. Fulop, G. Gervino, L. Gialanella, A. Guglielmetti, C. Gustavino, G. Gyurky, A. Loiano, G. Imbriani, A. P. Jesus, M. Junker, P. Musico, A. Ordine, F. Parodi, M. Parolin, J. V. Pinto, P. Prati, J. P. Ribeiro, V. Roca, D. Rogalla, C. Rolfs, M. Romano, C. Rossi-Alvarez, A. Rottura, F. Schuemann, E. Somorjai, F. Strieder, F. Terrasi, H. P. Trautvetter, A. Vomiero, and S. Zavatarelli,
"A new setup for the underground study of capture reactions",
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, vol. 489, issue 1-3, pp. 160-169, 2002.
Abstractn/a
Mateus, R., A. P. Jesus, B. Braizinha, J. Cruz, J. V. Pinto, and J. P. Ribeiro,
"Proton-induced gamma-ray analysis of lithium in thick samples",
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, vol. 190, pp. 117-121, 2002.
Abstractn/a
Ceia, T. F., A. G. Silva, C. S. Ribeiro, J. V. Pinto, M. H. Casimiro, A. M. Ramos, and J. Vital,
"PVA composite catalytic membranes for hyacinth flavour synthesis in a pervaporation membrane reactor",
Catalysis Today, vol. 236, pp. 98-107, 2014.
Abstractn/a
Alves, E., R. C. da Silva, J. V. Pinto, T. Monteiro, B. Savoini, D. Caceres, R. Gonzalez, and Y. Chen,
"Radiation-damage recovery in undoped and oxidized Li doped MgO crystals implanted with lithium ions",
Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions with Materials and Atoms, vol. 206, pp. 148-152, 2003.
Abstractn/a
Cruz, M. M., J. V. Pinto, R. C. da Silva, E. Alves, R. Gonzalez, and M. Godinho,
"Relaxation behaviour of Co and Ni implanted into MgO",
Journal of Magnetism and Magnetic Materials, vol. 316, issue 2, pp. E776-E778, 2007.
Abstractn/a
Nunes, D., L. Santos, P. Duarte, A. Pimentel, J. V. Pinto, P. Barquinha, P. A. Carvalho, E. Fortunato, and R. Martins,
"Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior",
Microscopy and Microanalysis, vol. 21, issue 01, pp. 11, 2015.
AbstractThe present work reports a simple and easy wet chemistry synthesis of cuprous oxide (Cu2O) nanospheres at room temperature without surfactants and using different precursors. Structural characterization was carried out by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy coupled with focused ion beam and energy-dispersive X-ray spectroscopy. The optical band gaps were determined from diffuse reflectance spectroscopy. The photoluminescence behavior of the as-synthesized nanospheres showed significant differences depending on the precursors used. The Cu2O nanospheres were constituted by aggregates of nanocrystals, in which an on/off emission behavior of each individual nanocrystal was identified during transmission electron microscopy observations. The thermal behavior of the Cu2O nanospheres was investigated with in situ X-ray diffraction and differential scanning calorimetry experiments. Remarkable structural differences were observed for the nanospheres annealed in air, which turned into hollow spherical structures surrounded by outsized nanocrystals. FAU - Nunes, Daniela
Casella, C., H. Costantini, a. Lemut, B. Limata, D. Bemmerer, R. Bonetti, C. Broggini, L. Campajola, P. Cocconi, P. Corvisiero, J. Cruz, a. D'Onofrio, a. Formicola, Z. Fülöp, G. Gervino, L. Gialanella, a. Guglielmetti, C. Gustavino, G. Gyurky, a. Loiano, G. Imbriani, P. a. Jesus, M. Junker, P. Musico, a. Ordine, F. Parodi, M. Parolin, J. V. Pinto, P. Prati, J. P. Ribeiro, V. Roca, D. Rogalla, C. Rolfs, M. Romano, C. Rossi-Alvarez, a. Rottura, F. Schuemann, E. Somorjai, F. Strieder, F. Terrasi, H. P. Trautvetter, a. Vomiero, and S. Zavatarelli,
"{A new setup for the underground study of capture reactions}",
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 489, pp. 160–169, 2002.
AbstractFor the study of astrophysically relevant capture reactions in the underground laboratory LUNA a new setup of high sensitivity has been implemented. The setup includes a windowless gas target, a 4$π$ BGO summing crystal, and beam calorimeters. The setup has been recently used to measure the d(p,$\gamma$)3He cross-section for the first time within its solar Gamow peak, i.e. down to 2.5keV c.m. energy. The features of the optimized setup are described. © 2002 Elsevier Science B.V. All rights reserved.
Correia, R., J. Deuermeier, M. R. Correia, J. {Vaz Pinto}, J. Coelho, E. Fortunato, and R. Martins,
"{Biocompatible Parylene-C Laser-Induced Graphene Electrodes for Microsupercapacitor Applications}",
ACS Applied Materials {&} Interfaces, vol. 14, no. 41: American Chemical Society, pp. 46427–46438, oct, 2022.
Abstractn/a
Nunes, D., T. R. Calmeiro, S. Nandy, J. V. Pinto, A. Pimentel, P. Barquinha, P. A. Carvalho, J. C. Walmsley, E. Fortunato, and R. Martins,
"{Charging effects and surface potential variations of Cu-based nanowires}",
Thin Solid Films: Elsevier B.V., pp. 1–9, 2015.
AbstractThe presentwork reports charging effects and surface potential variations in pure copper, cuprous oxide and cu- pric oxide nanowires observed by electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM). The copper nanowires were produced by wet synthesis, oxidation into cuprous oxide nanowires was achieved throughmicrowave irradiation and cupric oxide nanowireswere obtained via furnace annealing in at- mospheric conditions. Structural characterization of the nanowireswas carried out byX-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. During the EFM experiments the electrostatic field of the positive probe charged negatively the Cu-based nanowires, which in turn polarized the SiO2 dielectric substrate. Both the probe/nanowire capacitance as well as the sub- strate polarization increased with the applied bias. Cu2O and CuO nanowires behaved distinctively during the EFMmeasurements in accordancewith their band gap energies. Thework functions(WF) of the Cu-based nano- wires, obtained by KPFM measurements, yieldedWFCuO N WFCu N WFCu2O
Cruz, M. M., R. C. Silva, J. V. Pinto, R. P. Borges, N. Franco, and A. Casaca,
"{Formation of oriented nickel aggregates in rutile single crystals by Ni implantation}",
Journal of Magnetism and Magnetic Materials, vol. 340: Elsevier, pp. 102–108, 2013.
AbstractThe magnetic and electrical properties of Ni implanted single crystalline TiO2 rutile were studied for nominal implanted fluences between 0.5?1017 cm−2 and 2.0?1017 cm−2 with 150 keV energy, corre- sponding to maximum atomic concentrations between 9 at{%} and 27 at{%} at 65 nm depth, in order to study the formation of metallic oriented aggregates. The results indicate that the as implanted crystals exhibit superparamagnetic behavior for the two higher fluences, which is attributed to the formation of nanosized nickel clusters with an average size related with the implanted concentration, while only paramagnetic behavior is observed for the lowest fluence. Annealing at 1073 K induces the aggregation of the implanted nickel and enhances the magnetization in all samples. The associated anisotropic behavior indicates preferred orientations of the nickel aggregates in the rutile lattice consistent with Rutherford backscattering spectrometry—channelling results. Electrical conductivity displays anisotropic behavior but no magnetoresistive effects were detected.