10 documents found, page 1 of 1
Eco-friendly Methods for Extraction and Modification of Cellulose: An Overview
Magalhães, Solange; Fernandes, Catarina; Pedrosa, Jorge F. S.; Alves, Luís; Medronho, Bruno; Ferreira, Paulo J.; Rasteiro, Maria da GraçaCellulose is the most abundant renewable polymer on Earth and can be obtained from several different sources, such as trees, grass, or biomass residues. However, one of the issues is that not all the fractionation processes are eco-friendly and are essentially based on cooking the lignocellulose feedstock in a harsh chemical mixture, such as NaOH + Na2S, and water, to break loose fibers. In the last few years, ...
Influence of dispersion of fibrillated cellulose on the reinforcement of coated...
Sanchez-Salvador, Jose Luis; Rasteiro, Maria da Graça; Balea, Ana; Sharma, Mohit; Pedrosa, Jorge F. S.; Negro, Carlos; Monte, M ConcepcionThe use of cellulose micro/nanofibrils (CMNFs) as reinforcement paper additive at industrial scale is delayed due to inconsistent results, suggesting a lack of proper consideration of some key parameters. The high influence of fibrillated nanocellulose dispersion has been recently identified as a key parameter for paper bulk reinforcement but it has not been studied for surface coating applications yet. This pa...
Assessing the Genotoxicity of Cellulose Nanomaterials in a Co-Culture of Human ...
Ventura, Célia; Pinto, Fátima V.; Lourenço, Ana Filipa; Pedrosa, Jorge F. S.; Fernandes, Susete N.; da Rosa, Rafaela R.; Godinho, Maria HelenaCellulose micro/nanomaterials (CMNMs) are innovative materials with a wide spectrum of industrial and biomedical applications. Although cellulose has been recognized as a safe material, the unique properties of its nanosized forms have raised concerns about their safety for human health. Genotoxicity is an endpoint that must be assessed to ensure that no carcinogenic risks are associated with exposure to nanoma...
Assessing the Genotoxicity of Cellulose Nanomaterials in a Co-Culture of Human ...
Ventura, Célia; Pinto, Fátima; Lourenço, Ana Filipa; Pedrosa, Jorge F. S.; Fernandes, Susete N.; da Rosa, Rafaela R.; Godinho, Maria HelenaCellulose micro/nanomaterials (CMNMs) are innovative materials with a wide spectrum of industrial and biomedical applications. Although cellulose has been recognized as a safe material, the unique properties of its nanosized forms have raised concerns about their safety for human health. Genotoxicity is an endpoint that must be assessed to ensure that no carcinogenic risks are associated with exposure to nanoma...
Eco-friendly methods for extraction and modification of cellulose: an overview
Magalhães, Solange; Fernandes, Catarina; Pedrosa, Jorge F. S.; Alves, Luís; Medronho, Bruno; Ferreira, Paulo J. T.; Rasteiro, Maria da GraçaCellulose is the most abundant renewable polymer on Earth and can be obtained from several different sources, such as trees, grass, or biomass residues. However, one of the issues is that not all the fractionation processes are eco-friendly and are essentially based on cooking the lignocellulose feedstock in a harsh chemical mixture, such as NaOH + Na<sub>2</sub>S, and water, to break loose fibers. In the last ...
Effect of cationization pretreatment on the properties of cationic Eucalyptus m...
Pedrosa, Jorge F. S.; Rasteiro, Maria G.; Neto, Carlos P.; Ferreira, Paulo J. T.Micro/nanofibrillated celluloses (M/NFCs) have attracted considerable research interest over the past few decades, with various pretreatments being used to reduce energy consumption and/or increase fibrillation. To date, few studies have considered cationization as a pretreatment for their preparation. In this work, quaternary ammonium groups were attached to cellulose fibers by a direct reaction with 2,3-epoxy...
Genotoxicity of Three Micro/Nanocelluloses with Different Physicochemical Chara...
Ventura, Célia; Marques, Catarina; Cadete, João; Vilar, Madalena; Pedrosa, Jorge F. S.; Pinto, Fátima; Fernandes, Susete NogueiraBackground: Nanocellulose is an innovative engineered nanomaterial with an enormous potential for use in a wide array of industrial and biomedical applications and with fast growing economic value. The expanding production of nanocellulose is leading to an increased human exposure, raising concerns about their potential health effects. This study was aimed at assessing the potential toxic and genotoxic effects ...
Analysis of the In Vitro Toxicity of Nanocelluloses in Human Lung Cells as Comp...
Pinto, Fátima V.; Lourenço, Ana Filipa; Pedrosa, Jorge F. S.; Gonçalves, Lídia; Ventura, Célia; Vital, Nádia; Bettencourt, Ana; Fernandes, Susete N.Cellulose micro/nanomaterials (CMNM), comprising cellulose microfibrils (CMF), nanofibrils (CNF), and nanocrystals (CNC), are being recognized as promising bio-nanomaterials due to their natural and renewable source, attractive properties, and potential for applications with industrial and economical value. Thus, it is crucial to investigate their potential toxicity before starting their production at a larger ...
Assessment of the Performance of Cationic Cellulose Derivatives as Calcium Carb...
Pedrosa, Jorge F. S.; Alves, Luís; Neto, Carlos P.; Rasteiro, Maria G.; Ferreira, Paulo J. T.Cationic polyacrylamides (CPAMs) are usually used as filler retention agents in papermaking formulations. However, increasing environmental restrictions and their non-renewable origin have driven research into bio-based alternatives. In this context, cationic lignocellulosic derivatives have been attracting considerable research interest as a potential substitute. In this work, distinct cationic celluloses with...
Toxicidade da nanocelulose em modelos in vitro: um contributo para a avaliação ...
Ventura, Célia; Pinto, Fátima; Marques, Catarina; Cadete, João; Vilar, Madalena; Lourenço, Ana Filipa; Pedrosa, Jorge F. S.; Fernandes, Susete N.As nanoceluloses são nanomateriais inovadores com potencial para uma vasta gama de aplicações industriais e biomédicas. No entanto, a expansão da sua produção tem vindo a suscitar preocupações quanto aos possíveis efeitos, a longo prazo, na saúde humana. Este estudo teve como objetivo avaliar a segurança de algumas nanoceluloses produzidas a partir de matéria-prima nacional, através da caracterização da sua pot...