A5089136609- Advanced Cellulose Research Studies
- Electrospun Nanofibers in Biomedical Applications
- Supercapacitor Materials and Fabrication
- Surface Modification and Superhydrophobicity
- Advanced battery technologies research
- biodegradable polymer synthesis and properties
- Advanced Battery Technologies Research
- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced Data Storage Technologies
- Rheology and Fluid Dynamics Studies
- Nanocomposite Films for Food Packaging
- Natural Fiber Reinforced Composites
- Electric Vehicles and Infrastructure
- Electromagnetic wave absorption materials
- Fiber-reinforced polymer composites
- Polysaccharides and Plant Cell Walls
- Electrohydrodynamics and Fluid Dynamics
- Lignin and Wood Chemistry
- Textile materials and evaluations
- Copper-based nanomaterials and applications
- Nanomaterials for catalytic reactions
- Catalytic Processes in Materials Science
Vaisala (Finland)
2023
Aalto University
2014-2020
Bioinstitut
2017
Abstract Hydrogels comprising cellulose nanofibrils (CNF) were used in the synthesis of continuous filaments via wet-spinning. Hydrogel viscosity and spinnability, as well orientation strength spun filaments, found to be strongly affected by osmotic pressure determined CNF surface charge solid fraction spinning dope. The tensile strength, Young’s modulus degree (wide-angle X-ray scattering, WAXS) produced without drawing 297 MPa, 21 GPa 83%, respectively, which are remarkable values. A...
We introduce an eco-friendly process to dramatically simplify carbon microfiber fabrication from biobased materials. The microfibers are first produced by wet-spinning in aqueous calcium chloride solution, which provides rapid coagulation of the hydrogel precursors comprising wood-derived lignin and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNF). thermomechanical performance obtained lignin/TOCNF filaments is investigated as a function nanofibril...
A continuous and scalable method for the wet spinning of cellulose nanofibrils (CNFs) is introduced in a core/shell configuration. Control on interfacial interactions was possible by choice shell material coagulant, as demonstrated here with guar gum (GG) acetate (CA). Upon coagulation acetone, ethanol, or water, GG CA formed supporting polymer shells that interacted to different degrees CNF core. Coagulation rate shown markedly influence orientation filament and, result, its mechanical...
Abstract Coagulation is a critical process in the assembly of cellulose nanofibrils into filaments by wet spinning; however, so far, role coagulation solvent has not been systematically elucidated this context. This work considers organic non-solvents (ethanol, acetone) and aqueous electrolyte solutions (NaCl(aq), HCl(aq), CaCl 2 (aq)) for negatively charged via spinning. The associated mechanisms with such resulted different spinnability, drying time. properties achieved varied depending...
Hydrogels of TEMPO-oxidized nanocellulose were stabilized for dry-jet wet spinning using a shell cellulose dissolved in 1,5-diazabicyclo[4.3.0]non-5-enium propionate ([DBNH][CO2Et]), protic ionic liquid (PIL). Coagulation an acidic water bath resulted continuous core-shell filaments (CSFs) that tough and flexible with average dry (and wet) toughness ∼11 (2) MJ·m-3 elongation ∼9 (14) %. The CSF morphology, chemical composition, thermal stability, crystallinity, bacterial activity assessed...
We demonstrate benzophenone (BP) conjugation via amine-reactive esters onto oxidized cellulosic fibers that were used as precursors, after microfluidization, of photoactive cellulose nanofibrils (CNF). From these fibrils, I filaments synthesized by hydrogel spinning in an antisolvent followed fast biradical UV cross-linking. As a result, the wet BP-CNF retained extensively original dry strength (a remarkable ∼80% retention). Thus, principal limitation emerging materials was overcome (the...
Colloidal dispersions of cellulose nanofibrils (CNFs) are viable alternatives to II dissolutions used for filament spinning. The porosity and water vapor affinity CNF filaments make them suitable controlled breathability. However, many textile applications also require repellence. Here, we investigated the effects postmodification wet-spun via chemical deposition (CVD). Two organosilanes with different numbers methyl substituents were considered. Various surface structures achieved, either...
The growing adoption of biobased materials for electronic, energy conversion, and storage devices has relied on high-grade or refined cellulosic compositions. Herein, lignocellulose nanofibrils (LCNF), obtained from simple mechanical fibrillation wood, are proposed as a source continuous carbon microfibers by wet spinning followed single-step carbonization at 900 °C. high lignin content LCNF (∼28% based dry mass), similar to that the original allowed synthesis with yield (29%) electrical...
The effect of the co-location electrochemical and kinetic energy storage on cradle-to-gate impacts system was studied using LCA methodology. intended for use in frequency containment reserve (FCR) application, considering a number daily charge–discharge cycles range 50–1000. results show that significant environmental benefit (up to 96% decrease global warming potential, from 1.65 ± 0.12 0.059 0.004 kg CO2-eq./kWh) can be obtained by battery flywheel systems, owing ability component preserve...
Abstract The performance of biobased carbon fiber (CF) can potentially be improved to a new level by enhancing its graphitization including graphitic additives as structural templates in the precursor. Mixing these precursor spinning solution influence rheology and thus process ensuing carbonization, though effects are not well understood. Herein, we analyze nanotube (CNT) graphene oxide (GO) on cellulose solutions ionic liquid subsequent CF preparation. Addition GO both thickened clearly...
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection for “Spinning of Cellulose Nanofibrils into Filaments: A Review”Meri J. Lundahl*†, Ville Klar‡, Ling Wang†, Mariko Ago†, and Orlando Rojas*†View Author Information† Department Bioproducts Biosystems, Aalto University, P.O. Box 16300, 00076 Aalto, Finland‡ Mechanical Engineering, 14100, FinlandCite this: Ind. Eng. Chem. Res. 2017, 56, 14, 4205Publication Date (Web):March 28,...
The effect of the co-location electrochemical and kinetic energy storage on cradle-to-gate impacts system was studied using LCA methodology. intended for use in frequency containment reserve (FCR) application, considering a number daily charge-discharge cycles range 50-1000. results show that significant environmental benefit (up to 96% decrease global warming potential, from 1.65±0.12 0.059±0.004 kg CO2-eq./kWh) can be obtained by battery flywheel systems, owing ability component preserve...