12 documents found, page 1 of 2
Effect of chitosan properties and dissolution state on solution rheology and fi...
Araújo, Francisca; Magalhães, Solange; Medronho, Bruno; Eivazi, Alireza; Dahlström, Christina; Norgren, Magnus; Alves, LuísChitosan films with potential application in triboelectric nanogenerators (TENGs) represent a promising approach to replace non-biobased materials in these innovative devices. In the present work, chitosan with varying molecular weights (MW) and degrees of deacetylation was dissolved in aqueous acetic acid (AA) at different acid concentrations. It was observed that the MW had a greater influence on the viscosit...
Poly(butylene succinate)-based composites with technical and extracted lignins ...
Melro, Elodie; Duarte, Hugo; Eivazi, Alireza; Costa, Carolina; Faleiro, Maria Leonor; Rosa Da Costa, Ana; Antunes, Filipe E.; Valente, Artur J. M.Poly(butylene succinate) (PBS) has been drawing attention as a reliable biodegradable and sustainable alternative to synthetic petroleum-based polymers. In this study, PBS-lignin composites were developed using a recently extracted lignin (LA-lignin) from pine wood residues employing an innovative sustainable approach. These composites were systematically compared with PBS-based composites formed with commonly ...
Regenerated cellulose properties tailored for optimized triboelectric output an...
Dahlström, Christina; Eivazi, Alireza; Nejström, Malin; Zhang, Renyun; Pettersson, Torbjörn; Iftikhar, Haider; Rojas, Orlando J.; Medronho, BrunoCellulose has shown great potential in the development of green triboelectric nanogenerators. Particularly, regenerated cellulose (R-cellulose) has shown remarkably high output power density but the structural features and key parameters that explain such superior performance remain unexplored. In this work, wood cellulose fibers were dissolved in a LiOH(aq)-based solvent to produce a series of R-cellulose film...
On the valorization of olive oil pomace: a sustainable approach for methylene b...
Saoudi Hassani, El Mokhtar; Duarte, Hugo; Brás, João; Taleb, Abdeslam; Taleb, Mustapha; Rais, Zakia; Eivazi, Alireza; Norgren, Magnus; Romano, AnabelaCurrently, industrial water pollution represents a significant global challenge, with the potential to adversely impact human health and the integrity of ecosystems. The continuous increase in global consumption has resulted in an exponential rise in the use of dyes, which have become one of the major water pollutants, causing significant environmental impacts. In order to address these concerns, a number of wa...
Stacking self-gluing cellulose II films: a facile strategy for the formation of...
Dahlström, Christina; Duan, Ran; Eivazi, Alireza; Magalhães, Solange; Alves, Luís; Engholm, Magnus; Svanedal, Ida; Håkan Edlund; Medronho, BrunoCellulose laminates represent a remarkable convergence of natural materials and modern engineering, offering a wide range of versatile applications in sustainable packaging, construction, and advanced materials. In this study, novel all-cellulose laminates are developed using an environmentally friendly approach, where freshly regenerated cellulose II films are stacked without the need for solvents (for impregn...
Lignin-furanic rigid foams: Enhanced methylene blue removal capacity, recyclabi...
Duarte, Hugo; Brás, João; Saoudi Hassani, El Mokhtar; Aliaño González, María José; Magalhães, Solange; Alves, Luís; Valente, Artur J. M.Worldwide, populations face issues related to water and energy consumption. Water scarcity has intensified globally, particularly in arid and semiarid regions. Projections indicate that by 2030, global water demand will rise by 50%, leading to critical shortages, further intensified by the impacts of climate change. Moreover, wastewater treatment needs further development, given the presence of persistent organ...
Perspectives on the Lindman Hypothesis and Cellulose Interactions
Norgren, Magnus; Costa, Carolina; Alves, Luís; Eivazi, Alireza; Dahlström, Christina; Svanedal, Ida; Edlund, Håkan; Medronho, BrunoIn the history of cellulose chemistry, hydrogen bonding has been the predominant explanation when discussing intermolecular interactions between cellulose polymers. This is the general consensus in scholarly textbooks and in many research articles, and it applies to several other biomacromolecules' interactions as well. This rather unbalanced description of cellulose has likely impacted the development of mater...
Perspectives on the Lindman Hypothesis and cellulose interactions
Norgren, Magnus; Costa, Carolina; Alves, Luís; Eivazi, Alireza; Dahlström, Christina; Svanedal, Ida; Edlund, Håkan; Medronho, BrunoIn the history of cellulose chemistry, hydrogen bonding has been the predominant explanation when discussing intermolecular interactions between cellulose polymers. This is the general consensus in scholarly textbooks and in many research articles, and it applies to several other biomacromolecules’ interactions as well. This rather unbalanced description of cellulose has likely impacted the development of mater...
Lignin enhances cellulose dissolution in cold alkali
Costa, Carolina; Medronho, Bruno; Eivazi, Alireza; Svanedal, Ida; Lindman, Björn; Edlund, Håkan; Norgren, MagnusAqueous sodium hydroxide solutions are extensively used as solvents for lignin in kraft pulping. These are also appealing systems for cellulose dissolution due to their inexpensiveness, ease to recycle and low toxicity. Cellulose dissolution occurs in a narrow concentration region and at low temperatures. Dissolution is often incomplete but additives, such as zinc oxide or urea, have been found to significantly...
On the Development of All-Cellulose Capsules by Vesicle-Templated Layer-by-Laye...
Eivazi, Alireza; Medronho, Bruno; Lindman, Björn Olof; Norgren, MagnusPolymeric multilayer capsules formed by the Layer-by-Layer (LbL) technique are interesting candidates for the purposes of storage, encapsulation, and release of drugs and biomolecules for pharmaceutical and biomedical applications. In the current study, cellulose-based core-shell particles were developed via the LbL technique alternating two cellulose derivatives, anionic carboxymethylcellulose (CMC), and catio...