A5068679434- Fiber-reinforced polymer composites
- Advanced Cellulose Research Studies
- Lignin and Wood Chemistry
- Carbon Nanotubes in Composites
- Graphene research and applications
- Aerogels and thermal insulation
- Advanced ceramic materials synthesis
- biodegradable polymer synthesis and properties
- Smart Materials for Construction
- Iron oxide chemistry and applications
- Advanced X-ray Imaging Techniques
- Bone Tissue Engineering Materials
- Nanotechnology research and applications
- Mechanical Behavior of Composites
- Cultural Heritage Materials Analysis
- Titanium Alloys Microstructure and Properties
- Nanoparticle-Based Drug Delivery
- Nuclear Physics and Applications
- X-ray Diffraction in Crystallography
- Proteins in Food Systems
- Surface Modification and Superhydrophobicity
- Clay minerals and soil interactions
- Polysaccharides and Plant Cell Walls
- Pesticide and Herbicide Environmental Studies
- Diamond and Carbon-based Materials Research
BOKU University
2016-2025
Medical University of Vienna
2022
Creative Commons
2022
University of Vienna
2003-2009
TU Wien
2007
ABSTRACT Cutinases have shown potential for hydrolysis of the recalcitrant synthetic polymer polyethylene terephthalate (PET). We previously that rate this can be enhanced by addition hydrophobins, small fungal proteins alter physicochemical properties surfaces. Here we investigated whether PET-hydrolyzing activity a bacterial cutinase from Thermobifida cellulosilytica (Thc_Cut1) would further fusion to one three Trichoderma i.e., class II hydrophobins HFB4 and HFB7 pseudo-class I...
The synthesis of iron oxide nanoparticles (NPs) by thermal decomposition precursors using oleic acid as surfactant has evolved to a state-of-the-art method produce monodisperse, spherical NPs. principles behind such monodisperse syntheses are well-known: the key is separation between burst nucleation and growth phase, whereas size population set precursor-to-surfactant ratio. Here we follow pentacarbonyl in presence via situ X-ray scattering. This allows reaction kinetics precursor states be...
The impact of selected cellulose solvent systems based on the principal constituents tetrabutylammonium fluoride (TBAF), 1-ethyl-3-methyl-1H-imidazolium-acetate, N-methylmorpholine-N-oxide, or calcium thiocyanate octahydrate (CTO) properties II aerogels prepared from these has been investigated as a means towards tailoring aerogel with respect to specific applications. Cotton linters were used representative plant cellulose. Cellulose was coagulated solutions comparable content, and dried...
Dissolving pulp has been subjected to consecutive periodate/chlorite treatments afford 2,3-dicarboxyl cellulose (DCC, 1.02 mmol g–1 COOH). Subsequent nanofibrillation afforded stable nematic nf-DCC dispersions (average particle size 2.1 nm × 525 nm) at significantly lower energy input compared TEMPO-oxidation. Acid-induced gelation triggered by extensive hydrogen bonding sets the ordered state and affords free-standing hydrogels that can be converted highly transparent birefringent aerogels...
The promising applications of core–shell nanoparticles in the biological and medical field have been well investigated recent years. One remaining challenge is characterization structure hydrated polymer shell. Here we use small-angle X-ray scattering (SAXS) to investigate iron oxide core–poly(ethylene glycol) brush shell with extremely high grafting density. It shown that density profile can be described by a scaling model takes into account locally very near core. A good fit constant...
Nano-reinforcements in carbon fibre-reinforced polymer (CFRP) have proven to enhance the mechanical properties considering quasi-static, as well fatigue load and, are a promising option with regard CFRP performance optimisation. While general knowledge about nanofiller content and its influence is documented, use of alignment techniques for specific orientation nano-reinforcements still insufficiently studied. In this work, oriented nanofibres (CNF) on bidirectional investigated. was...
Spider silk (SPSI) is a promising candidate for use as filler material in nerve guidance conduits (NGCs), facilitating peripheral regeneration by providing scaffold Schwann cells (SCs) and axonal growth. However, the specific properties of SPSI that contribute to its regenerative success remain unclear. In this study, egg sac Trichonephila (T.) inaurata investigated, which contains two distinct fiber types: tubuliform (TU) major ampullate (MA) silk. These fibers serve models derive...
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...
Charcoals were produced from spruce and beech wood under laboratory conditions at different pyrolysis temperatures (300–1300 °C). Characterization of these charcoals was conducted using eight analytical methods. Each method describes specific changes in the temperature range until 1300 °C. Therefore, combination methods provides comprehensive information on stages. Fourier transform infrared (FTIR) spectroscopy, NMR thermogravimetry display 700 A prediction model for 800 °C is presented...
Carbon nanotubes (CNT) provide an outstanding property spectrum which can be used to improve a wide range of materials. However, the transfer properties from nanoscale macroscopic material is limiting factor. Different approaches functionalizing surface CNT interaction with surrounding matrix but connected difficult and expensive treatments, are usually inconvenient for industrial applications. Here, simple eco-friendly method presented oxidation CNT, where hydrogen peroxide (H2O2) only...
A facile approach for adding moisture resistance to transparent nematic aerogels composed of individualized cellulose nanofibers (i-CNF) at full preservation the anisotropic aerogel structure is presented. Sequential nitroxide-mediated oxidation and mechanical fiber delamination were applied obtain i-CNF dispersions in water. Nematic ordering caused by repulsive forces between surface carboxylate groups was set acid-induced hydrogen bonding gelation, respectively. Solvent exchange acetone,...
Lignin is produced abundantly in wood pulping. Because it currently mainly used for the generation of process energy and electrical by combustion, its isolation from processing liquor subsequent purification potential higher value uses challenging. Therefore, present study evaluates feasibility direct carbonization spray-dried two relevant industrial pulping processes with aim obtaining electrically conducting carbon. Analysis reveals significant differences thermal stability a sulfite...
Abstract Preservation and conservation of archaeological wooden artifacts is extremely challenging due to a lack knowledge about the hierarchical structure preserved cellulose. Herein we report on comparative analysis eight four recent wood samples from three sites in China by variety methods, including micro-morphology, Fourier Transform Infrared Spectrum, X-ray scattering, chromatographic sugars, solid state 13 C CP/MAS NMR. Results show that deterioration microscale clearly related...
Assembly of (bio)polymers into long-range anisotropic nanostructured gels and aerogels is great interest in advanced material engineering since it enables directional tuning properties, such as diffusivity, light, heat, sound propagation, cell proliferation, mechanical properties. Here we present an approach toward cellulose II that employs specific diffusion phase separation phenomena occurring during decelerated infusion antisolvent isotropic supercooled solutions ionic liquid to...
Carbon microparticles were produced from organosolv lignin at 2000 °C under argon atmosphere following oxidative thermostabilisation 250 °C. Scanning electron microscopy, X-ray diffraction, small-angle scattering, and electro-conductivity measurements revealed that the obtained particles electrically conductive composed of large graphitic domains. Poly(lactic acid) filled with various amounts lignin-derived showed higher tensile stiffness increasing particle load, whereas strength...
Lignin is an interesting renewable resource for carbon fibers. In this work we investigate the usage of unpurified softwood kraft lignin Indulin AT melt-spinning lignin-fibers and properties resulting blended with 10, 15 20 wt% polyethylene glycol (PEG) melt-spun on a pilot plant. The obtained as-spun fibers are stabilized in air afterwards transformed to at carbonization temperatures 900 °C, 1500 2000 °C 2300 °C. Along process chain characterized by mechanical testing, scanning electron...
The study demonstrates the potential of enzymatic hydrolysis and alkaline pretreatment for sustainable blended textile recycling. target is complete cellulose removal while preserving polyester integrity recovery. Interactions sodium hydroxide concentration (10 %–30 %), urea (0 %–12 temperature (-20 °C–50 °C) were investigated during using a design experiments. Analysis revealed bimodal pattern in mass loss, with one peak at lower concentrations temperatures, more prominent higher...