A5002871709- Advanced Cellulose Research Studies
- Electrospun Nanofibers in Biomedical Applications
- Aerogels and thermal insulation
- Pickering emulsions and particle stabilization
- Magnetism in coordination complexes
- 3D Printing in Biomedical Research
- Lignin and Wood Chemistry
- biodegradable polymer synthesis and properties
- Organic and Molecular Conductors Research
- Polysaccharides and Plant Cell Walls
- Biofuel production and bioconversion
- Bone Tissue Engineering Materials
- Nanomaterials for catalytic reactions
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Materials and Mechanics
- Catalysis for Biomass Conversion
- Additive Manufacturing and 3D Printing Technologies
- Silk-based biomaterials and applications
- SARS-CoV-2 detection and testing
- Biosensors and Analytical Detection
- Advanced biosensing and bioanalysis techniques
- Iron-based superconductors research
- Hydrogels: synthesis, properties, applications
- Nanocomposite Films for Food Packaging
- Microplastics and Plastic Pollution
BOKU University
2015-2024
Aalto University
2019-2022
Université Toulouse III - Paul Sabatier
2020-2021
Queensland University of Technology
2021
Laboratoire de Chimie de Coordination
2020-2021
Laboratoire Matériaux et Phénomènes Quantiques
2020-2021
Université Paris Cité
2020-2021
Centre National de la Recherche Scientifique
2021
Universitat Politècnica de València
2013
Abstract The remarkable efficiency of chemical reactions is the result biological evolution, often involving confined water. Meanwhile, developments bio-inspired systems, which exploit potential such water, have been so far rather complex and cumbersome. Here we show that surface-confined inherently present in widely abundant renewable cellulosic fibres can be utilised as nanomedium to endow a singular reactivity. Compared surface acetylation dry state, water increases reaction rate by 8...
Selective surface modification of biobased fibers affords effective individualization and functionalization into nanomaterials, as exemplified by the TEMPO-mediated oxidation. However, such a route leads to changes native chemistry, affecting interparticle interactions limiting development potential supermaterials. Here we introduce methodology extract elementary cellulose fibrils treatment biomass with N-succinylimidazole, achieving regioselective C6-OH, which can be reverted using mild...
Metal-phenolic network (MPN) foams are prepared using colloidal suspensions of tannin-containing cellulose nanofibers (CNFs) that ice-templated and thawed in ethanolic media the presence metal nitrates. The MPN facilitates formation solid by air drying, given strength self-supporting nature obtained tannin-cellulose nanohybrid structures. porous characteristics (dry wet) compression rationalized development secondary, cohesive metal-phenolic layers combined with a hydrogen bonding involving...
The here-introduced concept of the wet esterification enables direct modification never-dried cellulose fibres in aqueous media and is a straight-forward sustainable avenue towards surface-acetylated nanofibers.
The effective and straight-forward modification of nanostructured celluloses under aqueous conditions or as “never-dried” materials is challenging. We report a silanization protocol in water using catalytic amounts hydrogen chloride then sodium hydroxide two-step protocol. acidic step hydrolyzes the alkoxysilane to obtain water-soluble silanols subsequent addition NaOH induces covalent reaction between cellulose surficial hydroxyl groups respective silanols. developed enables incorporation...
Three-dimensional scaffolds (3D) with controlled shape, dual porosity and long-term mechanical dimensional stability in biofluids are of interest as biotemplates tissue engineering. Herein, self-standing lightweight cellulose-based biogenic a spatially structured morphology, macropores interconnected micropores were fabricated using combination direct ink writing 3D printing freeze-drying techniques. This was achieved by developing water-based low-cost bicomponent based on commercially...
To study biological processes in vitro, biomaterials-based engineering solutions to reproduce the gradients observed tissues are necessary. We present a platform for 3D bioprinting of functionally graded biomaterials based on carboxylated agarose, bioink amendable by extrusion bioprinting. Using this bioink, objects with gradient stiffness and cell concentration were printed. Functionalization agarose maleimide moieties that react minutes cysteine-terminated cell-adhesion peptide allowed us...
Cellulose II gels from a stream of the Lyocell fiber process were transformed into spherical nanoparticles by carboxymethylation and subsequent homogenization.
Scaffolds used for bone tissue engineering need to have a variety of features accommodate cells. The scaffold should mimic natural bone, it appropriate mechanical strength, support cell differentiation the osteogenic lineage, and offer adequate porosity allow vascularization in-growth. In this work, we aim at developing new process fabricate such materials by creating porous composite material made silk fibroin cellulose as suitable engineering. Silk are both dissolved together in...
A new regioselective route is introduced for surface modification of biological colloids in the presence water. Taking case cellulose nanofibers (CNFs), we demonstrate a site-specific (93% selective) reaction between primary hydroxyl groups (C6-OH) and acyl imidazoles. CNFs bearing C6-acetyl C6-isobutyryl groups, with degree substitution up to 1 mmol g-1 are obtained upon esterification, affording adjustable energy. The morphological structural features remain largely unaffected, but...
Herein, we fabricated chemically cross-linked polysaccharide-based three-dimensional (3D) porous scaffolds using an ink composed of nanofibrillated cellulose, carboxymethyl and citric acid (CA), featuring strong shear thinning behavior adequate printability. Scaffolds were produced by combining direct-ink-writing 3D printing, freeze-drying, dehydrothermal heat-assisted cross-linking techniques. The last step induces a reaction CA. Degree was controlled varying the CA concentration (2.5-10.0...
The modification of cellulose as a renewable resource has received wide attention in research and industry. A major problem regarding chemical modification, including heating drying, is related to hornification that causes pore-system collapse results decreased reactivity changes the 3D structure material. mild green approach for different never-dried thus wet substrates (pulp, nanostructured celluloses, viscose fibers) by an alkoxysilane-azide water presented. kinetic study silanization...
Cellulose nanofibrils (CNF) are usually obtained by breaking down the lignocellulosic structure of pulp, i.e., as cellulose I allomorph and according to rather energy-intensive pathways. In contrast those approaches, TENCEL gel is from a nonfibrous II precursor directly out Lyocell process in deceptively energy-efficient way: After enzymatic treatment only one cycle high-pressure homogenizer (comparing up 20 cycles for CNF manufacture) final obtained. The utilization starting material an...
Oxidation of cellulose with periodate under aqueous conditions yields dialdehyde cellulose, a promising functional derivative. The main obstacles for this oxidation have been its slow kinetics and the dilute reaction conditions, requiring considerable amounts water energy. In study, these drawbacks are overcome by conducting at high cellulosic pulp consistency cellulose/water weight ratio 1:4. oxidizer, efficiently mixed in ball mill. occurs mostly subsequent step, during resting time (no...
This work established an energy-saving and straightforward treatment of cellulosic pulp to obtain functional cellulose nanofibers equipping them at the same time with catalytic activity flame-retardant properties. For this purpose, dried was mixed a recyclable swelling agent, ZnCl2 hydrate, room temperature. The mild affected crystal structure through partial amorphization, yielding mix native I regenerated II. tremendously facilitated fibrillation into nanofiber (CNF) network. In comparison...
Colloids are suitable options to replace surfactants in the formation of multiphase systems while simultaneously achieving performance benefits. We introduce synergetic combination colloids for interfacial stabilization complex fluids that can be converted into lightweight materials. The strong interactions between high aspect ratio and hydrophilic fibrillated cellulose (CNF) with low hydrophobic particles afford superstable Pickering foams. foams were used as a scaffolding precursor porous,...
As one of the most abundant, multifunctional biological polymers, polysaccharides are considered promising materials to prepare tissue engineering scaffolds. When properly designed, wetted porous scaffolds can have biomechanics similar living and provide suitable fluid transport, both which key features for in vitro vivo growth. They further mimic components function glycosaminoglycans found extracellular matrix tissues. In this study, we investigate formed by charge complexation between...
Gas-phase acylation is an attractive and sustainable method for modifying the surface properties of cellulosics. However, little known concerning regioselectivity chemistry, i.e., which cellulose hydroxyls are preferentially acylated if can be restricted to surface, preserving crystallinities/morphologies. Consequently, we reexplore simple gas-phase acetylation modern-day cellulosic building blocks - nanocrystals, pulps, dry-jet wet spun (regenerated cellulose) fibres a nanocellulose-based...
Cellulose II nanospheres with a soft, amorphous outer shell are synthesized and characterized to show their structure–property relationship.