{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T19:19:35Z","timestamp":1762543175556,"version":"build-2065373602"},"reference-count":74,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2020,2,7]],"date-time":"2020-02-07T00:00:00Z","timestamp":1581033600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Program Budget COMPETE \u2014 Operational Program Competitiveness and Internationalization \u2014 COMPETE 2020 and the Lisbon Regional Operational Program in its FEDER component and by the budget of FCT Foundation for Science and Technology, I.P","award":["POCI-01-0145-FEDER-031220"],"award-info":[{"award-number":["POCI-01-0145-FEDER-031220"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>Nowadays, concrete degradation is a major problem in the civil engineering field. Concrete carbonation, one of the main sources of structures\u2019 degradation, causes concrete\u2019s pH to decrease; hence, enabling the necessary conditions for corrosion reinforcement. An accurate, non-destructive sensor able to monitor the pH decrease resistant to concrete conditions is envisaged by many researchers. Optical fibre sensors (OFS) are generally used for concrete applications due to their high sensitivity and resistance to external interferences. Organic-inorganic hybrid (OIH) films, for potential functionalization of OFS to be applied in concrete structures, were developed. Polydimethylsiloxane (PDMS) based sol-gel materials were synthesized by the formation of an amino alcohol precursor followed by hydrolysis and condensation. Different ratios between PDMS and (3-aminopropyl)triethoxysilane (3-APTES) were studied. The synthesized OIH films were characterized by Fourier-transformed infrared spectroscopy (FTIR), UV\u2013Vis spectroscopy, electrochemical impedance spectroscopy (EIS) and thermogravimetric analysis (TGA). The OIH films were doped with phenolphthalein (Phph), a pH indicator, and were characterized by UV\u2013Vis and EIS. FTIR characterization showed that the reaction between both precursors, the hydrolysis and the condensation reactions occurred successfully. UV\u2013Vis characterization confirmed the presence of Phph embedded in the OIH matrices. Dielectric and thermal properties of the materials showed promising properties for application in contact with a high alkaline environment.<\/jats:p>","DOI":"10.3390\/polym12020371","type":"journal-article","created":{"date-parts":[[2020,2,7]],"date-time":"2020-02-07T11:50:28Z","timestamp":1581076228000},"page":"371","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["PDMS Based Hybrid Sol-Gel Materials for Sensing Applications in Alkaline Environments: Synthesis and Characterization"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3741-3039","authenticated-orcid":false,"given":"Rui P. C. L.","family":"Sousa","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal"}]},{"given":"B\u00e1rbara","family":"Ferreira","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1374-9427","authenticated-orcid":false,"given":"Miguel","family":"Azenha","sequence":"additional","affiliation":[{"name":"ISISE, Departamento de Engenharia Civil, Escola de Engenharia, Campus de Azur\u00e9m, Universidade do Minho, 4800-058 Guimar\u00e3es, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7915-4720","authenticated-orcid":false,"given":"Susana P. G.","family":"Costa","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6211-3295","authenticated-orcid":false,"given":"Carlos J. 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