13 documents found, page 1 of 2
A greener route to prepare PEBAX®1074 membranes for gas separation processes
Ortiz-Albo, Paloma; Delgado Alves, Vitor; Kumakiri, Izumi; Crespo, Joao; Neves, Luísa A.The solvent used in membrane fabrication is crucial for a potential industrial application, with a direct effect on its safety, environmental and economic impact. Thus, in the last years, the search for greener and safer solvents became of utmost importance aiming for a sustainable fabrication of highly performing membranes, since that also affects the final membrane morphology. Typically, solvent evaporation-b...
Impact of Ionic Liquid Structure and Loading on Gas Sorption and Permeation for...
Ortiz-Albo, Paloma; Ferreira, Tiago J.; Martins, Carla F.; Delgado Alves, Vitor; Esteves, Isabel A.A.C.; Cunha-Silva, Luís; Kumakiri, IzumiCarbon dioxide (CO2) capture has become of great importance for industrial processes due to the adverse environmental effects of gas emissions. Mixed matrix membranes (MMMs) have been studied as an alternative to traditional technologies, especially due to their potential to overcome the practical limitations of conventional polymeric and inorganic membranes. In this work, the effect of using different ionic li...
Characterisation of Films Based on Exopolysaccharides from Alteromonas Strains ...
Concórdio-Reis, Patrícia; Pereira, João R.; Delgado Alves, Vitor; Nabais, Ana R.; Neves, Luísa A.; Marques, Ana C.; Fortunato, Elvira; Moppert, XavierThis work assessed the film-forming capacity of exopolysaccharides (EPS) produced by six Alteromonas strains recently isolated from different marine environments in French Polynesia atolls. The films were transparent and resulted in small colour alterations when applied over a coloured surface (ΔEab below 12.6 in the five different colours tested). Moreover, scanning electron microscopy showed that the EPS film...
Cr-based MOF/IL composites as fillers in mixed matrix membranes for CO2 separation
Ferreira, Inês C.; Ferreira, Tiago J.; Barbosa, André D.S.; Castro, Baltazar; Ribeiro, Rui P.P.L.; Mota, José P.B.; Delgado Alves, VitorNew composite materials made of bromide-based ionic liquids (ILs) and metal–organic framework (MOF) MIL- 101(Cr) were produced using two different ILs. The powdered composites [PMIM][Br]@MIL-101(Cr) and [BMIM][Br]@MIL-101(Cr) were rigorously characterized, and it was confirmed that both ILs were incorporated into the MOF structure. Single-component CO2 and N2 adsorption–desorption isotherms for the pristine MIL...
Poly(ethylene glycol) Diacrylate Iongel Membranes Reinforced with Nanoclays for...
Nabais, Ana R.; Francisco, Rute O.; Delgado Alves, Vitor; Neves, Luísa A.; Tomé, Liliana C.Despite the fact that iongels are very attractive materials for gas separation membranes, they often show mechanical stability issues mainly due to the high ionic liquid (IL) content ( 60 wt%) needed to achieve high gas separation performances. This work investigates a strategy to improve the mechanical properties of iongel membranes, which consists in the incorporation of montmorillonite (MMT) nanoclay, from 0...
Development of cellulose-based polymeric structures using dual functional ionic...
Galamba, Joana; Delgado Alves, Vitor; Jordão, Noemi; Neves, Luísa A.Carboxylate ionic liquids (ILs) combining benzethonium (BE) and didecyldimethylammonium (DDA) as cations have been explored to be used for the first time as dual functional solvents for microcrystalline cellulose (MCC) dissolution and, subsequently development of polymeric structures. Considering that some ILs can remain in the polymeric structures after phase inversion, these ILs can offer advantages such as a...
Rendering banana plant residues into a potentially commercial byproduct by dopi...
Nascimento, Rosa E.A.; Monte, Joana; Cadima, Mafalda; Delgado Alves, Vitor; Neves, Luísa A.This study seeks to render residues from banana plants into a useful byproduct with possible applications in wound dressings and food packaging. Films based on cellulose extracted from banana plant pseudostem and doped with phenolic compounds extracted from banana plant leaves were developed. The phenolic compounds were extracted using batch solid-liquid and Soxhlet methods, with different drying temperatures a...
Chitin-glucan complex – Based biopolymeric structures using biocompatible ionic...
Ferreira, Inês C.; Araújo, Diana; Voisin, Pierre; Delgado Alves, Vitor; Rosatella, Andreia A.; Afonso, Carlos A.M.; Freitas, Filomena; Neves, Luísa A.This work explores the novelty of dissolving chitin-glucan complex (CGC), from two fungal strains, Komagataella pastoris (CGCP) and Aspergillus niger (CGCKZ) (KiOnutrime-CG™), using biocompatible ionic liquids (ILs). Three cholinium-based ILs were tested, choline acetate, choline propionate and choline hexanoate. Although all tested ILs resulted in the dissolution of the co-polymer at a concentration of 5 % (w/...
Preparation and characterization of films based on a natural P(3HB)/mcl-PHA ble...
Rebocho, Ana Teresa; Pereira, João R.; Neves, Luísa A.; Delgado Alves, Vitor; Sevrin, Chantal; Grandfils, Christian; Freitas, Filomena; Reis, Maria A.M.The co-culture of Cupriavidus necator DSM 428 and Pseudomonas citronellolis NRRL B-2504 was performed using apple pulp waste from the fruit processing industry as the sole carbon source to produce poly(3-hydroxybutyrate), P(3HB) and medium-chain length PHA, mcl-PHA, respectively. The polymers accumulated by both strains were extracted from the co-culture’s biomass, resulting in a natural blend that was composed...
Preparation and Characterization of Films Based on a Natural P(3HB)/mcl-PHA Ble...
Rebocho, Ana Teresa; Pereira, João R.; Neves, Luísa A.; Delgado Alves, Vitor; Sevrin, Chantal; Grandfils, Christian; Freitas, Filomena; Reis, Maria A.M.The co-culture of Cupriavidus necator DSM 428 and Pseudomonas citronellolis NRRL B-2504 was performed using apple pulp waste from the fruit processing industry as the sole carbon source to produce poly(3-hydroxybutyrate), P(3HB) and medium-chain length PHA, mcl-PHA, respectively. The polymers accumulated by both strains were extracted from the co-culture’s biomass, resulting in a natural blend that was composed...