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Sorbitol was tested as a plasticizer. The produced gel formulations included alginate\/sorbitol and carrageenan\/alginate\/sorbitol mixtures, with tested sorbitol concentrations of 0.0, 0.5 and 1.0 wt%. The limestone sludge waste obtained from the processing of quarried limestone was converted into an aqueous solution of Ca2+ by dissolution with mineral acid. This solution was then diluted in water and used to induce gel crosslinking. The necessity of using sorbitol as a component of the crosslinking solution was also assessed. The resulting films were characterized regarding their dimensional stability, microstructure, chemical structure, mechanical performance and antifungal properties. Alginate\/sorbitol films displayed poor dimensional stability and were deemed not viable. Carrageenan\/alginate\/sorbitol films exhibited higher dimensional stability and smooth and flat surfaces, especially in compositions with 0.5 wt% sorbitol. However, an increasing amount of plasticizer appears to result in severe surface cracking, the development of a segregation phenomenon affecting carrageenan and an overall decrease in films\u2019 mechanical resistance. Although further studies regarding film composition\u2014including plasticizer fraction, film optimal thickness and film\/mold material interaction\u2014are mandatory, the attained results show the potential of the reported \u0269-carrageenan\/alginate\/sorbitol films to be used towards the development of viable films derived from algal polysaccharides.<\/jats:p>","DOI":"10.3390\/ma17071668","type":"journal-article","created":{"date-parts":[[2024,4,5]],"date-time":"2024-04-05T08:27:52Z","timestamp":1712305672000},"page":"1668","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Use of Limestone Sludge in the Preparation of \u0269-Carrageenan\/Alginate-Based Films"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7216-0260","authenticated-orcid":false,"given":"Pedro","family":"Ad\u00e3o","sequence":"first","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"}]},{"given":"Maria da Luz","family":"Calado","sequence":"additional","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3819-0885","authenticated-orcid":false,"given":"Wilson","family":"Fernandes","sequence":"additional","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7938-9850","authenticated-orcid":false,"given":"Lu\u00eds G.","family":"Alves","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Institute of Molecular Sciences, Department of Chemical Engineering, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4974-1075","authenticated-orcid":false,"given":"Leonor","family":"C\u00f4rte-Real","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Institute of Molecular Sciences, Department of Chemical Engineering, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal"}]},{"given":"Mafalda","family":"Guedes","sequence":"additional","affiliation":[{"name":"UnIRE, ISEL, Instituto Polit\u00e9cnico de Lisboa, Av. Conselheiro Em\u00eddio Navarro 1, 1959-007 Lisboa, Portugal"},{"name":"LaPMET-CeFEMA, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"given":"Ricardo","family":"Baptista","sequence":"additional","affiliation":[{"name":"UnIRE, ISEL, Instituto Polit\u00e9cnico de Lisboa, Av. Conselheiro Em\u00eddio Navarro 1, 1959-007 Lisboa, Portugal"},{"name":"LAETA, IDMEC, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7775-0614","authenticated-orcid":false,"given":"Raul","family":"Bernardino","sequence":"additional","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"},{"name":"Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), School of Technology and Management (ESTM), Polytechnic Institute of Leiria, 2520-614 Peniche, Portugal"},{"name":"ALiCE\u2014Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8008-9839","authenticated-orcid":false,"given":"Maria M.","family":"Gil","sequence":"additional","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0883-0610","authenticated-orcid":false,"given":"Maria Jorge","family":"Campos","sequence":"additional","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"}]},{"given":"Susana","family":"Bernardino","sequence":"additional","affiliation":[{"name":"MARE-ARNET and Escola de Turismo e Tecnologias do Mar, Instituto Polit\u00e9cnico de Leiria, 2520-614 Peniche, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"012002","DOI":"10.1088\/1757-899X\/1205\/1\/012002","article-title":"The use of limestone sludge for the geopolymer preparation","volume":"1205","author":"Kubatova","year":"2021","journal-title":"IOP Conf. 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