A5063045311- Advanced Cellulose Research Studies
- Nanocomposite Films for Food Packaging
- biodegradable polymer synthesis and properties
- Adsorption, diffusion, and thermodynamic properties of materials
- Lignin and Wood Chemistry
- Polymer Foaming and Composites
- Material Properties and Processing
- Nanoparticles: synthesis and applications
- Coagulation and Flocculation Studies
- Electrospun Nanofibers in Biomedical Applications
- Biofuel production and bioconversion
- Thermal and Kinetic Analysis
- Iron oxide chemistry and applications
- Polysaccharides and Plant Cell Walls
- Minerals Flotation and Separation Techniques
- Magnetic Properties and Synthesis of Ferrites
- Constructed Wetlands for Wastewater Treatment
- Chemical Thermodynamics and Molecular Structure
University of Coimbra
2014-2024
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, studies considered cationization as a pretreatment for their preparation. In this work, quaternary ammonium groups were attached cellulose fibers by direct reaction 2,3-epoxypropyltrimethylammonium chloride or two-step method (periodate oxidation + Girard's reagent T). The...
Natural-based coagulants have emerged as a reliable option to implement more sustainable operations and management of wastewater treatment plants. This work aims at evaluating the use cationic nanofibrillated celluloses (cNFC) novel bio-based flocculants treat domestic wastewaters by most widely employed process – coagulation/flocculation. Two cNFC samples were prepared with different charge densities tested coagulant/flocculants using water characteristics. The effect cNFCs was studied...
Cellulose micro/nanomaterials (CMNM), comprising cellulose microfibrils (CMF), nanofibrils (CNF), and nanocrystals (CNC), are being recognized as promising bio-nanomaterials due to their natural renewable source, attractive properties, potential for applications with industrial economical value. Thus, it is crucial investigate toxicity before starting production at a larger scale. The present study aimed evaluating the cell internalization in vitro cytotoxicity genotoxicity of CMNM compared...
Cellulose nanofibrils (CNFs) are particles with a high aspect ratio. Typically, chemically pre-treated CNFs (containing anionic or cationic charged groups) consist of long fibrils (up to 2 μm) very low thickness (less than 10 nm). Derived from their ratio, form strong hydrogels elasticity at concentrations. Thus, CNF suspensions appear as an interesting rheology modifier be applied in cosmetics, paints, foods, and mineral suspending agent, among other applications. The viscosity results the...
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 been attracting considerable interest a potential substitute. work, distinct celluloses with degrees of substitution between 0.02 1.06 morphological properties were synthesized via the cationization bleached...
(1) Background: Nanocellulose is an innovative engineered nanomaterial with enormous potential for use in a wide array of industrial and biomedical applications fast growing economic value. The expanding production nanocellulose leading to increased human exposure, raising concerns about their health effects. This study was aimed at assessing the toxic genotoxic effects different nanocelluloses two mammalian cell lines; (2) Methods: Two micro/nanocelluloses, produced TEMPO oxidation...
Cellulose micro/nanomaterials (CMNMs) are innovative materials with a wide spectrum of industrial and biomedical applications. Although cellulose has been recognized as safe material, the unique properties its nanosized forms have raised concerns about their safety for human health. Genotoxicity is an endpoint that must be assessed to ensure no carcinogenic risks associated exposure nanomaterials. In this study, we evaluated genotoxicity two types micro/nanofibrils (CMF CNF) one sample...
Cellulose nanofibrils (CNFs) are materials with high aspect ratio. Typically, TEMPO-oxidised, or cationic CNFs consist of long fibrils (up to 2 μm) very low thickness (less than 10 nm). Derived from their ratio, form strong hydrogels elasticity at concentrations. Thus, CNF suspensions appear as an interesting rheology modifier be applied in cosmetics, paints, foods, a mineral suspending agent, among other applications. The viscosity results the 3D fibril network, which is related good...