A5010766533- Advanced Cellulose Research Studies
- Electrospun Nanofibers in Biomedical Applications
- Nanocomposite Films for Food Packaging
- Material Properties and Processing
- Surface Modification and Superhydrophobicity
- Lignin and Wood Chemistry
- biodegradable polymer synthesis and properties
- Polysaccharides and Plant Cell Walls
- Pickering emulsions and particle stabilization
- Electrohydrodynamics and Fluid Dynamics
- Additive Manufacturing and 3D Printing Technologies
- Advanced Sensor and Energy Harvesting Materials
- Biofuel production and bioconversion
- Algal biology and biofuel production
- Acoustic Wave Resonator Technologies
- Nanofabrication and Lithography Techniques
- Aerogels and thermal insulation
- Membrane Separation Technologies
- Dyeing and Modifying Textile Fibers
- High voltage insulation and dielectric phenomena
- Surfactants and Colloidal Systems
- Electrochemical sensors and biosensors
- Advanced Materials and Mechanics
- Recycling and Waste Management Techniques
- Hydrogels: synthesis, properties, applications
VTT Technical Research Centre of Finland
2016-2025
Tieto (Finland)
2015-2023
Tampere University
2011
University of Helsinki
2003-2009
Aalto University
2009
Keskuslaboratorio
2008
University of Technology
2005
This work investigates the surface and bulk properties of nanofibrillated cellulose (NFC) bacterial (BC), as well their reinforcing ability in polymer nanocomposites. BC possesses higher critical tension 57 mN m–1 compared to NFC (41 m–1). The thermal degradation temperature both nitrogen air atmosphere was also found be than that NFC. These results are good agreement with crystallinity determined by XRD, measured 71% for 41%. Nanocellulose papers were prepared from Both possessed similar...
The current work demonstrates an innovative approach to develop nanocellulose based membranes <italic>via in situ</italic> TEMPO functionalization of the thin functional layer cellulose nanocrystals (CNC<sub>BE</sub>) enhance metal ion adsorption capacity.
Would it not be nice to have an organic solvent nanofiltration membrane made from renewable resources that can manufactured as simply producing paper? Here the production of membranes nanocellulose by applying a papermaking process is demonstrated. Manufacture nanopapers was enabled inducing flocculation nanofibrils upon addition trivalent ions.
This paper combines theoretical considerations with experimental evidence to explain the behavior of cellulose when exposed different media. The observations are explained based on amphiphilic character molecule and fundamental physicochemical phenomena. Nanofibrillated was chosen demonstrate phenomena since due its high surface area effects at issue pronounced. X-Ray photoelectron spectroscopy contact angle measurements were used chemical energetical changes taking place surface, atomic...
In a number of different applications for enzymes and specific binding proteins key technology is the immobilization these to types supports. this work we describe concept protein that based on nanofibrillated cellulose (NFC). NFC form where fibers have been disintegrated into fibrils are only few nanometers in diameter very large aspect ratio. Proteins were conjugated through three strategies using amine, epoxy, carboxylic acid functionalized NFC. The conjugation chemistries chosen...
This article presents a waterborne nanocellulose coating process to change the surface characteristics and mitigate fouling of commercially available polyethersulfone (PES) microfiltration membranes. An extensive comparative study between nanoporous nano-textured layers composed cellulose nanocrystals (CNC) or TEMPO-oxidized nanofibrils (T-CNF), which were coated on PES membrane by taking advantage electrostatic interactions substrate, polyallylamine hydrochloride (PAHCl) anchoring layer,...
Microplastics accumulate in various aquatic organisms causing serious health issues, and have raised concerns about human by entering our food chain. The recovery techniques for the most challenging colloidal fraction are limited, even analytical purposes. Here we show how a hygroscopic nanocellulose network acts as an ideal capturing material tiniest nanoplastic particles. We reveal that entrapment of particles from aqueous environment is primarily result network's nature - feature which...
In this study chemically surface-modified nanofibrillated cellulose (NFC) was used at low levels (0.5 to 3 wt%) as reinforcement in a polyvinyl alcohol (PVA) matrix. The modified NFC–PVA films prepared by solution casting technique showed improved mechanical performance and good optical properties. NFC allylated further epoxidised with hydrogen peroxide. addition of 1 wt% epoxy-NFC enhanced the modulus strength pure PVA film, 474% 224%, respectively. This composite film exhibited visible...
Despite the relevance of water interactions, explicit analysis vapor adsorption on biologically derived surfaces is often difficult. Here, a system was introduced to study uptake native polysaccharide surface; namely, cellulose nanocrystal (CNC) ultrathin films were examined with quartz crystal microbalance dissipation monitoring (QCM-D) and spectroscopic ellipsometry (SE). A significant mass by CNC detected using QCM-D upon increasing relative humidity. In addition, thickness changes...
Miniaturised test specimens are often used for the tensile testing of cellulose nanopapers as there currently no standardised geometries to evaluate their properties. In this work, we report influence specimen on measured properties plant-derived nanofibres (CNF) and microbially synthesised bacterial (BC) nanopapers. Four were studied: (i) miniaturised dog bone with 2 mm width, (ii) rectangular 5 (iii) standard width (iv) 15 width. It was found that moduli both CNF BC not significantly...
Humidity is an efficient instrument for facilitating changes in local architectures of two-dimensional surfaces assembled from nanoscaled biomaterials. Here, complementary surface-sensitive methods are used to collect explicit and precise experimental evidence on the water vapor sorption into (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) oxidized cellulose nanofibril (CNF) thin film over relative humidity (RH) range 0 97%. Changes thickness mass due uptake tracked using spectroscopic...
Crosslinked cellulose nanofiber-polyvinyl alcohol antifouling membrane.
We developed a method for extracting CitCNCs from discarded cotton garments via esterification followed by mechanical fibrillation. LCA analysis, based on lab-scale data, guides strategies to minimize the environmental impact of CitCNC production.
The adsorption and viscoelastic properties of layers a cationic polyelectrolyte (cationic starch, CS, with 2-hydroxy-3-trimethylammoniumchloride as the substituent) adsorbed from aqueous solutions (pH 7.5, added NaCl 0, 1, 100, 500 mM) on silica were studied quartz crystal microbalance dissipation (QCM-D). Three different starches investigated (weight-average molecular weights M(w) approximately 8.7 x 10(5) 4.5 degree substitution DS = 0.75 8.8 0.2). At low ionic strength, are thin rigid...
The adsorption of cationic starch (CS) from aqueous electrolyte solutions onto model cellulose film has been investigated by the quartz crystal microbalance with dissipation monitoring (QCM-D) and X-ray photoelectron spectroscopy (XPS). influence composition charge density CS was examined. followed general trends expected for polyelectrolyte on oppositely charged surfaces, some exceptions. Thus, as result very low surface surface, highly did not adsorb in a flat conformation even at ionic...