http://hdl.handle.net/10174/1141 2026-04-04T07:28:18Z 2026-04-04T07:28:18Z Castanheiro, José Cansado, Isabel Mourão, Paulo http://hdl.handle.net/10174/39774 2025-12-10T10:48:48Z 2025-10-23T23:00:00Z

Title: Acetylation of 1,8-cineole with acetic anhydride over zeolites Authors: Castanheiro, José; Cansado, Isabel; Mourão, Paulo Abstract: Neste trabalho foi realizado um estudo sobre a acetilação de 1,8-cineol com anidrido acético usando zeólitos como catalisadores. A reação foi realizada num reator descontínuo a 60º C. Os produtos da reação foram nonoacetotos e os diaacetatos, sendo também observado a formação de polímero (provavelmente oligómeros). Foram testados, como catalisadores, o zeólito beta, USY e ZSM-5. Os catalisadores foram caracterizados por difração de raios X de pós e adsorção de azoto a 77K. Observou-se que todos os materiais possuem microporos. O zeólito beta mostrou ser o catalisador mais ativo na acetilação do 1,8-cineol, enquanto que o zeólito ZSM-5 mostrou a atividade catalítica mais baixa. O zeólito USY tem maior seletividade para os monoacetatos enquanto que o catalisador ZSM-5 tem maior seletividade para o diacetato. Após a reação, os zeólitos apresentam uma cor acastanhada, que poderá ser indicação da formação de polímero que se depositou na superfície do mesmo

2025-10-23T23:00:00Z Castanheiro, José Cansado, Isabel Mourão, Paulo Mendes, joana http://hdl.handle.net/10174/39738 2025-12-10T10:39:47Z 2025-10-23T23:00:00Z

Title: METOXILAÇÃO DE TERPENOS COM CATALISADOR HETEROGÉNEO Authors: Castanheiro, José; Cansado, Isabel; Mourão, Paulo; Mendes, joana Abstract: A metoxilação de terpenos (alfa-pineno, beta-pineno e limoneno) foi realizada num reator descontínuo a 60º C. Foi preparado um catalisador consistindo em poli(álcool vinílico) com um heteropoliácido (ácido tungstofosfórico) e reticulado com ácido sulfosuccínico, com o objectivo de introduzir grupos ácido sulfónico na matriz polimérica. Este catalisador (PW-PVA-SO3H) foi caracterizado por FTIR-ATR. Observou-se que as bandas características do heteropoliácido e dos grupos sulfónico estão presentes no catalisador. Verificaou-se que, quando se utilizou beta-pineno como substrato, a atividade catalítica é muito superior aos outros substratos (alfa-pineno e limoneno). O alfa-pineno é menos reativo do que o beta-pineno mas mais reativo do que o limoneno. A selectividade para hidrocarbonetos terpénicos e éteres terpénicos na presença do catalisador PW-PVA-SO3H foi também estudada. Verificou-se que a selectividade para os éteres terpénicos diminui com o aumento da conversão do terpeno. Foi ainda realizado um estudo do efeito da massa do catalisador na metoxilação do beta-pineno. Observa-se que a converão de beta-pineno aumenta com a massa do catalisador

2025-10-23T23:00:00Z Galacho, Cristina Rocha, Luzia A.Correia, André L. Coutinho, Mathilda Tsoupra, Anna Pires, Ema Belchior, Susana A. de Abreu, Edward I. Girginova, Penka http://hdl.handle.net/10174/37212 2024-08-09T15:09:22Z 2024-05-31T23:00:00Z

Title: EXPLORING SUITNANOMUSIC PROJECT: AN INTERDISCIPLINARY PERSPECTIVE ON “RATINHOS” FAIENCE PLATES Authors: Galacho, Cristina; Rocha, Luzia; A.Correia, André; L. Coutinho, Mathilda; Tsoupra, Anna; Pires, Ema; Belchior, Susana; A. de Abreu, Edward; I. Girginova, Penka Editors: Raposo, Daniel; Neves, João; Silva, Ricardo; Dias, Rui Abstract: In this communication we present case studies of two groups of ceramic artifacts with musical iconography studied in the frame of the on-going exploratory project Suit- NanoMusic (IN2PAST). Combining knowledge derived from different areas, such as Chemistry, Conservation Science, Musical Iconography and Humanities and Social Sciences, the project triggers an interdisciplinary discussion on the preservation of tangible musical heritage. The studied artefacts represent two groups of the wider collection of faience plates, the “Ratinho” and the Viúva Alfredo de Oliveira (V.A.O.) pottery faience, a production inspired by the ‘Ratinho’ faience. They had been produced in Coimbra region in Central Portugal at different time frames and belong to the Museu Nacional da Música (Portugal). To further understand the chronology of production the technology of the faience plates the chemical composition of the glaze and colouring elements were analysed by means of handheld x-ray fluorescence, and the colourants were identified combining the information acquired by hyperspectral imaging and colorimetry. The colours in both types of plates present similarities, nevertheless, the analysis suggests that there was some innovation regarding the colour palette with the introduction of new materials. Regarding the glaze composition, the presence of zinc in the V.A.O. glaze is the only differentiation detected among the two productions. The Musical Iconographic and Organological studies reveal distinctively characteristic within the decorative repertoire of “Ratinho” plates. Musical instruments play a central role in the iconographic representationin both kinds of productions, where a female musician playing a cittern and a child playing a transverse flute have been depicted. Studying these ceramic plates reveals key insights into their production techniques and the historical, artistic,and cultural dimensions of musical iconography, highlighting the depiction of music and musicians across various eras and contexts, specifically of rural workers which have few coeval written sources exist.

2024-05-31T23:00:00Z Araújo, Nuno Fernandes, Filipe Rosa, Álvaro Borges, Ana Vicente, Henrique Neves, José http://hdl.handle.net/10174/36131 2024-01-18T10:48:13Z 2023-01-01T00:00:00Z

Title: Prioritize Health Care in the Context of the Pandemic Authors: Araújo, Nuno; Fernandes, Filipe; Rosa, Álvaro; Borges, Ana; Vicente, Henrique; Neves, José Abstract: This work examines citizens’ attitudes towards Personal Priority Criteria according to their responses to questions that are part of questionnaires such as Priority Related Groups, Priorities Related to The General Population, and Priority in General, i.e., it shows that health condition severity, patient utility, and cost-effectiveness significantly influence people’s attitudes toward using personal criteria in setting those priorities. In thiswork such attitudes are highlighted by relating Social and Collective Intelligence (SCI), Logic Programming (LP) and The Laws of Thermodynamics (LoT) to a computer system where SCI aligns one with the methods and methodologies of problem solving; LP explains how theory improves practice, and LoT expresses the process of systems development in terms of increased/decreased of entropy.

2023-01-01T00:00:00Z