http://hdl.handle.net/10174/14486 2026-07-16T04:36:24Z 2026-07-16T04:36:24Z Silva, Leonel C. Otero, Vanessa Melo, Maria J. Cabrita, Eurico J. Mafra, Luís http://hdl.handle.net/10174/42333 2026-07-09T16:22:04Z 2023-01-01T00:00:00Z

Title: What’s the Madder? Characterization of Old Fashioned Alizarin/Aluminum Red Pigments Using Liquid and Solid-State NMR Authors: Silva, Leonel C.; Otero, Vanessa; Melo, Maria J.; Cabrita, Eurico J.; Mafra, Luís Abstract: This work provides significant insight into the molecular structure of alizarin lake pigments used by artists in the past. To characterize two red powders, lakes 1 and 2, obtained by complexation of 1,2-dihydroxy anthraquinone (alizarin) with Al3+, a multi-analytical approach was designed based on solid and liquid state Nuclear Magnetic Resonance Spectroscopy (NMR), Fourier-Transform Infrared Spectroscopy (FTIR), Mass Spectrometry (MS) and Density Functional Theory (DFT) calculations. Lake 1 was synthesized according to literature and compared with lake 2, a reproduction of an artist’s pigment. FTIR showed Al3+ coordinated to oxygens in C1 and C9, and that in lake 2 the -OH groups in C2 are protonated, being responsible for its low solubility. 1H-NMR proved that lake 2 is formed by two tautomers [Al(Aliz-2-H-)2(OH)(H2O)] and [Al(Aliz-10-H-)2(OH)(H2O)], the latter being the major species. SS-NMR was the only technique that got insight into the Al3+ coordination, octahedral for both lakes. It confirmed the existence of two species in lake 2, in a 5:1 ratio. Both are amorphous “open structures”, resulting in fewer constraints for the ligands and in a large variety of geometries. SS-NMR allowed the analysis of the red pigments without preparation, which is a unique advantage for their study in artworks.

2023-01-01T00:00:00Z Alegre, Leonel http://hdl.handle.net/10174/42327 2026-07-09T16:16:39Z 2025-01-01T00:00:00Z

Title: Regeneraction Path Handbook: Urban community builder professional profile and competency framework Authors: Alegre, Leonel Editors: Doubek, Daniela; Kalčić, Tanja Abstract: The Regeneraction Path Handbook was developed through a combination of desk research and focus group discussions conducted by project partners in Croatia, France, Portugal, Italy and Spain. It aims to develop a definition of the Urban Community Builder professional profile, as well as the essential competencies necessary to successfully drive transformative urban regenerative actions.

2025-01-01T00:00:00Z Ferreira, Teresa Nunes, Margarida Curto, Ana Manhita, Ana Palmeirão, Joana http://hdl.handle.net/10174/42285 2026-07-03T15:19:16Z 2026-07-01T23:00:00Z

Title: Unravelling the link between the simulacra of St Clemente of Palácio Nacional de Queluz and St Fortunato & St Semuc of Santa Casa da Misericórdia de Almada Authors: Ferreira, Teresa; Nunes, Margarida; Curto, Ana; Manhita, Ana; Palmeirão, Joana Abstract: This work presents a comparative osteological, material, and technical investigation of three 18th-century simulacra preserved in Portugal, aiming to clarify their origin, circulation, assembly, and shared workshop practices. Archival documentation and authentication seals confirmed their Roman origin and circulation during the 1770s. Radiocarbon dating places the skeletal remains between the 3rd and 5th centuries, spanning both periods of Christian persecution and subsequent imperial consolidation. Osteological, radiographic, and endoscopic analyses revealed differing anatomical configurations: St Semuc and St Fortunato incorporate remains from multiple non-adult individuals, assembled through deliberate substitution and consolidation practices, whereas St Clemente preserves a largely complete and anatomically coherent skeleton of a probable young adult male. Nevertheless, a similar assemblage for the body was uncovered for all simulacra. Facial modelling relied on silk gauze tiers, stiffened with various organic materials, alone or mixed, including proteinaceous and resin binders, such as collagen-based glues and conifer colophony-type. Imaging-based morphometric analysis was used to explore the weave type, and similar morphometric parameters were estimated, indicating a deliberate and coherent choice of gauze type. Ultimately, SEM-EDS showed that "false gold" strips (gilt-silvered-copper strips) were used in the simulacra's helmets. Overall, the interdisciplinary approach evidenced that simulacra were assembled as devotional reliquaries likely in Rome, and that they shared the same workshop or similar workshop practices.

2026-07-01T23:00:00Z Camara, Carlos Andre Lopes, Gonçalo Schiavon, Nicola Mirão, José Beltrame, Massimo http://hdl.handle.net/10174/42216 2026-06-18T09:06:07Z 2025-03-27T00:00:00Z

Title: Islamic Middle Ages Pottery from Muge (Portugal), Serradinho Archaeological Site—A Long-Lasting Tradition of Pottery Production Authors: Camara, Carlos Andre; Lopes, Gonçalo; Schiavon, Nicola; Mirão, José; Beltrame, Massimo Abstract: During the Islamic period, ceramic workshops were commonly established in settlements throughout the Gharb al-Andalus region (Western Iberia at the time), to produce ceramics for local supply. Along the middle valley of the Tagus river (i.e., nowadays central Portugal), hundreds of Islamic ceramic sherds, either glazed or common wares, were recovered over different archaeological excavations. At the archaeological site of Serradinho, located at Muge (Municipality of Salvaterra de Magos, Santarem District, Portugal), a fortuitous finding was unearthed during agricultural works in which ceramic sherds from the Emiral (8–9th century) to the Almoravid (mid–12th century) period were recorded. The uninterrupted time lapse evidenced by these ceramic artefacts is a one-off opportunity to trace back early Islamic ceramic production and to link it with the long-lasting ceramic tradition documented at Muge by ethnographic studies. In this study, insights into the provenance of raw materials and the pottery-manufacturing processes will be approached by means of different optical and analytical methods, namely Optical Microscopy (OM), X-Ray Diffraction (XRD), X-Ray Fluorescence (XRF), Scanning Electron Microscope, Energy Dispersive X-ray Spectroscopy (SEM-EDS) and granulometric tests on sediments offering some interesting parallels between archaeological and modern ceramic production. Results suggested that most ceramics were locally produced, while others were imported into the settlement during the Islamic Middle Ages. Moreover, data indicate that a locally available raw material which is still used nowadays for the production of traditional ceramics had been employed. This result confirms the exploitation of the same raw material over time, linking Islamic Middle Ages ceramic production to the modern one.

2025-03-27T00:00:00Z