A5087722770- Advanced Cellulose Research Studies
- Lignin and Wood Chemistry
- Biofuel production and bioconversion
- Polysaccharides and Plant Cell Walls
- Material Properties and Processing
- Natural Fiber Reinforced Composites
- Materials Engineering and Processing
- Mineral Processing and Grinding
- Cellular and Composite Structures
- Wood Treatment and Properties
- Textile materials and evaluations
- Nanocomposite Films for Food Packaging
- Liquid Crystal Research Advancements
- Acoustic Wave Phenomena Research
- Polysaccharides Composition and Applications
Aalto University
2018-2023
The origins of the unique properties natural fibres have remained largely unresolved because complex interrelations between structural hierarchy, chirality and bound water. In this paper, analysis melting endotherms for bleached hardwood pulps indicates that amount non-freezing water (0.21 g/g) is roughly half freezing (0.42 g/g). We link result to two smallest constitutive units, microfibrils their bundles, using molecular dynamics simulations at both hierarchical levels. layers found in...
Abstract In this study, sound absorbing materials were produced through foam forming technique using hardwood and softwood pulps with varying chemical composition, ultrastructural, morphological properties as raw materials. The absorption of the foams measured related to ultrastructure morphology pulp fibres. All fibre provided comparable those conventional porous used for acoustic purposes. general, further processing, well smaller dimensions contribute improve foams. results provide...
Enzymatic modification of bleached softwood kraft fibres for improved fibre reactivity was studied at high (20% w/w) and low (1% dry matter content. The role enzyme family structure in assessed using endoglucanases from three structurally different glycoside hydrolase (GH) families (5, 7 45) with without a carbohydrate binding module (CBM). Based on the amount dissolved sugars, action consistency about sixfold higher compared to treatment consistency. GH45 endoglucanase found be most...
The manufacturing of man-made cellulose fibers starts with the dissolution wood pulp fibers. Pulps can dissolve at different rates and leave amounts undissolved particles. Thus, their properties be modified to achieve better dissolution. Enzymatic treatments are an effective means enhancing dissolution, this study compares effect endoglucanase (TrCel45A) lytic polysaccharide monooxygenase (LPMO, TrAA9A) on bleached softwood Kraft 20 % solids content. enzymes were applied individually in...
The purpose of this study was to determine how control and measure the hierarchical swelling in pulp fibers via electrostatic interactions localized osmotic pressure. A eutectic solvent system used systematically increase phosphate groups cell wall. Increase fiber charge led an properties, as expected. At a value around 180-200 μmol/g macrofibrils were found deaggregate. This large jump mesoscale swelling, from 0.9 2.5 mL/g, surface area, 400 1000 m2/g. deaggregation confirmed with X-ray...
Abstract Recent years have witnessed an increasing interest in man-made cellulosic fibers, whose production generally requires cellulose dissolution and regeneration. Cellulosic fibers are difficult to dissolve. Thus, the recalcitrance of wood pulp can be estimate its reactivity. Pulp reactivity is usually assessed via complex time-consuming laboratory simulations viscose process. This study proposes a faster more convenient approach. The dissolution-based torque (DTR) test measures...
Prehydrolysis kraft (PHK) pulps account for more than half of the global market dissolving pulp. Characterized by high reactivity toward dissolution, their performances can still be improved activation treatments. This study compares dissolution kinetics in cupriethylenediamine a hardwood and softwood PHK before after high-solid-content mechano-enzymatic Three enzyme combinations were tested: endoglucanase (E), xylanase mannanase (XM), endoglucanase, xylanase, (EXM). Xylanase reduced...
Abstract The purpose of this study is to examine the hornification enzymatically hydrolyzed high consistency softwood kraft pulp in an experimental defibration dryer. This device dries under turbulent conditions which can prevent interfiber bonding and produce a separated fiber population. useful certain applications, such as composites, require dry, unbonded fibers. In study, we how fibrillated pulps behave dryer with respect pore expansion hydrolysis collapse drying (hornification). It was...
Reactivity is an important quality parameter form some grades of pulp, but its estimation usually complex and time demanding. The study verified the possibility to utilize alternative rheological approach investigate pulp reactivity rapidly with limited effort. 12.5 mL at 1.5% consistency was dissolved in bis(ethylenediamine) copper (II) hydroxide solution (CED) 1M reaction monitored by a torque rheogram two indices: optimal dissolution (ODT) initial rate (IDR). method used assess pulps...
One of the main trends in developing bio-based materials is to improve their mechanical and physical properties using MFC derived from sustainable natural sources compatible low-cost chemicals. The strength anionic based can be increased with addition multivalent cations. However, direct mixing solutions cations oxidized may result immediate, uncontrollable fibril aggregation flock formation. aim this study was design a method where Ca2+ ions liberate solid CaCO3 particles on bleached...
Abstract One of the critical challenges in fiber-based packaging industry is to produce low-density paperboards with high functionality and attractive cost structure. In this study, we examine how control hierarchical fiber swelling can be used enhance bonding generate a network excellent strength properties. Here, osmotic pressure inside cell wall increased by adding phosphate groups deep eutectic solvent (DES) functional drying method. Together mechanical refining, process causes fibril...
Abstract Paper-grade pulp, rich in hemicellulose content, is a cheap source for producing dissolving pulps. The main challenge the conversion of paper-grade pulp to higher-valued selective removal hemicelluloses, while maintaining reactivity. This paper presents comparison different extraction methods such as cold caustic extraction, IONCELL-P(ulp) and xylanase treatment on converting fully bleached soda bagasse pulp. treatment, using an optimized1-ethyl-3-methylimidazolium acetate/water...