A5006898674- Advanced Cellulose Research Studies
- Lignin and Wood Chemistry
- Biofuel production and bioconversion
- Wood Treatment and Properties
- Polysaccharides and Plant Cell Walls
- Catalysis for Biomass Conversion
- Material Properties and Processing
- Food composition and properties
- Cultural Heritage Materials Analysis
- Nanocomposite Films for Food Packaging
- Aerogels and thermal insulation
- Image Processing and 3D Reconstruction
- biodegradable polymer synthesis and properties
- Natural Fiber Reinforced Composites
- Proteins in Food Systems
- Electrospun Nanofibers in Biomedical Applications
- Dyeing and Modifying Textile Fibers
- Subcritical and Supercritical Water Processes
- Bamboo properties and applications
- Food Chemistry and Fat Analysis
- Enzyme Production and Characterization
- Surfactants and Colloidal Systems
- Surface Modification and Superhydrophobicity
- Enzyme-mediated dye degradation
- Textile materials and evaluations
Aalto University
2010-2025
Institut Laue-Langevin
2018-2021
Kyoto University
2015-2019
Institute of Wood Science and Technology
2019
Helsinki Institute of Physics
2010-2016
University of Helsinki
2010-2016
VTT Technical Research Centre of Finland
2010
Abstract Despite the structural, load‐bearing role of cellulose in plant kingdom, countless efforts have been devoted to degrading this recalcitrant polysaccharide, particularly context biofuels and renewable nanomaterials. Herein, we show how exposure plant‐based fibers HCl vapor results rapid degradation with simultaneous crystallization. Because unchanged sample texture lack mass transfer out substrate gas/solid system, changes crystallinity could be reliably monitored. Furthermore,...
The production of lignin nanoparticles (LNPs) has opened new routes to the utilization in advanced applications. existing challenge, however, is develop a method that can easily be adapted on an industrial scale. In this study, we demonstrated green and rapid preparing LNPs directly from sulfur-free alkaline pulping liquor by combining acid precipitation ultrasonication. combined produced spherical LNPs, with hierarchical nanostructure highly negative surface charge, within only 5 min...
The production of lignin nanoparticles (LNPs) has emerged as a way to overcome the highly variable and complex molecular structure lignin. It can offer morphological control polymer, allowing formation stable LNP dispersions in aqueous media, while increasing potential for high-value applications. However, polydispersity morphology LNPs varies depending on grade preparation method, systematic comparison using different technical lignins is lacking. In this study, it was attempted find green...
Understanding nanoscale moisture interactions is fundamental to most applications of wood, including cellulosic nanomaterials with tailored properties. By combining X-ray scattering experiments molecular simulations and taking advantage computed scattering, we studied the moisture-induced changes in cellulose microfibril bundles softwood secondary cell walls. Our models reproduced important experimentally observed diffraction peak locations widths gave new insights into their interpretation....
Abstract The purpose of this review is to report on the state-of-the-art interaction moisture with natural materials and fabricated biomimetic functional materials, an emphasis upon hygro-responsive behaviour wood. primary objective examine how water sorption affects dimensional knowledge property in plant-based (mainly, but not exclusively wood) can be used inform design moisture-responsive devices. study examines literature bio-inspired concentrating kinetics, migration location sorbed...
Swelling behavior and rearrangements of an amorphous ultrathin cellulose film (20 nm thickness) exposed to water subsequently dried were investigated with grazing incidence X-ray diffraction, neutron reflectivity, atomic force microscopy, surface energy calculations obtained from contact angle measurements. The swelled excessively in water, doubling its thickness, but shrunk back the original thickness upon removal. Crystallinity (or amorphousness) morphology remained relatively unchanged...
Development of affordable thermal energy storage (TES) has been hampered by the lack environmentally benign and scalable phase-change materials (PCM). Here we show size-controlled colloidal synthesis fatty acid-lignin hybrid nanocapsules demonstrate their applicability as PCM in dry wet states. The one-pot fabrication allowed for facile preparation capsules with a predictable concentration tall oil acid, oleic or lauric acid core-shell particles stabilized softwood kraft lignin. Phase-change...
Abstract Wood and other cellulosic materials are highly sensitive to changes in moisture content, which affects their use most applications. We investigated the effects of on nanoscale structure wood using X-ray neutron scattering, complemented by dynamic vapor sorption. The studied set samples included tension normal hardwood as well representatives two softwood species. Their nanostructure was characterized wet state before after first drying at relative humidities between 15 90%....
Spherical lignin nanoparticles (LNPs) fabricated via nanoprecipitation of dissolved are among the most attractive biomass-derived nanomaterials. Despite various studies exploring methods to improve uniformity LNPs or seeking more application opportunities for LNPs, little attention has been given fundamental aspects solvent effects on intrinsic properties LNPs. In this study, we employed a variety experimental techniques and molecular dynamics (MD) simulations investigate The were prepared...
Small-angle scattering methods allow an efficient characterization of the hierarchical structure wood and other cellulosic materials. However, their full utilization would require analytical model to fit experimental data. This contribution presents a small-angle tailored analysis samples. The is based on infinitely long cylinders packed in hexagonal array with paracrystalline distortion, adapted particular purpose modelling packing cellulose microfibrils secondary cell wall wood. new has...
HCl gas hydrolysis of a bacterial cellulose (BC) aerogel followed by 2,2,6,6-tetramethylpiperidine-1-oxyl radical-mediated oxidation was used to produce hydrolyzed BC with carboxylate groups, which subsequently disintegrated into stable dispersion nanocrystals (CNCs). The degree polymerization successfully reduced from 2160 220 CNC yield >80%.
Abstract X-ray scattering methods allow efficient characterization of cellulosic materials, but interpreting their results is challenging. By creating molecular dynamics models cellulose microfibrils and calculating the from them, we investigated how different properties structures affect intensities. We studied effects hemicelluloses crystal size on small-angle wide-angle (SAXS, WAXS). Microfibril with without surface-bound were built based chemical composition spruce secondary cell walls....
To understand the limitations occurring during enzymatic hydrolysis of cellulosic materials in renewable energy production, we used wide-angle X-ray scattering (WAXS), small-angle (SAXS), microtomography, and transmission electron microscopy (TEM) to characterize submicrometer changes structure microcrystalline cellulose (Avicel) digested with Trichoderma reesei enzyme system. The microtomography measurements showed a clear decrease particle size scale tens micrometers. In all TEM pictures,...
Plant-based cellulosic materials are intriguing building blocks for functional materials, and sustainable nanocellulose production strategies have been intensively explored. Most of the existing strategies, however, suffer from fact that highly energy-intensive fiber fibrillation yields a gel containing more than 95% water. We showcase high throughput method nanocellulose, which primarily exploits efficiency enzymatic actions to disintegrate pulp fibers at notable solid content (25 wt %)...
Abstract Background Microbial expansins (EXLXs) are non-lytic proteins homologous to plant involved in cell wall formation. Due their loosening properties and potential disaggregate cellulosic structures, there is considerable interest exploring the ability of microbial (EXLX) assist processing biomass for broader biotechnological applications. Herein, EXLXs with different modular structure from diverse phylogenetic origin were compared terms bind cellulosic, xylosic, chitinous substrates,...
Abstract The impact of drying on the structure never-dried hardwood cell wall was studied at nanometer level by means wide- and small-angle X-ray scattering (WAXS, SAXS), micrometer microtomography (μCT). Never-dried silver birch, European aspen hybrid samples were measured WAXS in situ during air. included juvenile mature wood, as well normal tension wood to allow comparison effects different matrix compositions microfibril angles. deformations cellulose crystallites amorphous components...