12 documents found, page 1 of 2

Limestone Processing Sludge: From Waste to Sustainable Resource

The limestone quarrying and processing industry generates huge amounts of waste, with limestone sludge being one of the most prevalent and challenging by-products. This study aims to evaluate the potential of limestone sludge as a sustainable secondary raw material for the mechanochemical synthesis of bioceramics, specifically hydroxyapatite (HA), for high-added-value applications in bone tissue engineering. Hi...

Limestone processing sludge: from waste to sustainable resource

The limestone quarrying and processing industry generates huge amounts of waste, with limestone sludge being one of the most prevalent and challenging by-products. This study aims to evaluate the potential of limestone sludge as a sustainable secondary raw material for the mechanochemical synthesis of bioceramics, specifically hydroxyapatite (HA), for high-added-value applications in bone tissue engineering. Hi...

Reaction path in the mechanosynthesis of calcium phosphates using a biogenic ca...

Calcium phosphates were produced by mechanosynthesis, using eggshell, H3PO4 and 6-83 wt%-H2O. Mixtures were milled at 600 rpm during 0.5-12 h. Resulting calcium phosphates occur within specific milling domains; H2O concentration determines onset and stability of monophasic hydroxyapatite. Within the tested conditions, brushite is the first detected calcium phosphate precipitated from solution. In 6, 40 and 56 w...

Manufacturing Calcium Phosphates Scaffolds Using 3D Printed Lost Molds

Development and characterization of films for food application incorporating po...

Non-biodegradable plastic is one of the biggest environmental problems of our lifetime and, considering the present societal needs, it will get worse. Consequently, there is an urgent need to develop sustainable and renewable alternatives to plastic, such as plastic-like materials obtained from biodegradable polymers, namely sulfated polysaccharides, considered one of the most viable alternatives. There is also...

Morphological and mechanical characterization of films incorporating Porphyran ...

This paper studies the effects of glycerol plasticizers and/or alginate, pectin, and carboxymethylcellulose polysaccharides on the mechanical and physical properties of porphyran-based films to evaluate the films’ ability to be used as food packaging. Films were characterized in terms of their composition, microstructural and morphological features, thermal properties, water interaction, and mechanical performa...

Enhancement of the antioxidant and antimicrobial activities of porphyran throug...

The chemical modification of porphyran hydrocolloid is attempted, with the objective of enhancing its antioxidant and antimicrobial activities. Sulfated galactan porphyran is obtained from commercial samples of the red algae Porphyra dioica using Soxhlet extraction with water at 100ºC and precipitation with isopropyl alcohol. The extracted porphyran is then treated with modified L-tyrosines in aqueous medium in...

Development and characterization of flms for food application incorporating Por...

Non-biodegradable plastic is one of the biggest environmental problems of our lifetime and, considering the present societal needs, it will get worse. Consequently, there is an urgent need to develop sustainable and renewable alternatives to plastic, such as plastic-like materials obtained from biodegradable polymers, namely sulfated polysaccharides, considered one of the most viable alternatives. There is also...

STEM KIT: Teachers’ Notebook

Participação em processos de consulta pública: Percepções dos cidadãos e recome...

Este  relatório  inscreve-­‐se  no  projecto  COMPOLIS  –  Comunicação  e  Envolvimento  Político com Questões Ambientais, financiado pela Fundação para a Ciência e a Tecnologia  com  a  referência  EXPL/IVC-­COM/1717/2012.  O  projecto  foi  desenvolvido  entre 1 de Julho de 2013 e 31 de Dezembro de 2014, tendo sido Anabela Carvalho, membro do Centro de Estudos de Comunicação e Sociedade (CECS) da Universidade...