A5057851405- Advanced Cellulose Research Studies
- Cultural Heritage Materials Analysis
- Lignin and Wood Chemistry
- Conservation Techniques and Studies
- Building materials and conservation
- Material Properties and Processing
- Dyeing and Modifying Textile Fibers
- Biofuel production and bioconversion
- Wood and Agarwood Research
- Enzyme-mediated dye degradation
- Polysaccharides and Plant Cell Walls
- Corrosion Behavior and Inhibition
- Aerogels and thermal insulation
- Nanocomposite Films for Food Packaging
- Dye analysis and toxicity
- biodegradable polymer synthesis and properties
- Polysaccharides Composition and Applications
- Polymer Foaming and Composites
- Mass Spectrometry Techniques and Applications
- Catalysis for Biomass Conversion
- Forensic Fingerprint Detection Methods
- Surface Modification and Superhydrophobicity
- Color Science and Applications
- Food composition and properties
- Spectroscopy and Chemometric Analyses
Staatliche Akademie der Bildenden Künste Stuttgart
2018-2025
Academy of Fine Arts Vienna
2018-2024
Walter de Gruyter (Germany)
2018-2024
BOKU University
2012-2022
Central Institute for Art History
2022
North Carolina State University
2018
Graz University of Technology
2017
Christian Doppler Laboratory for Thermoelectricity
2010-2013
Literature is strongly contradictory about the molecular reasons for yellowing and brightness reversion of pure (lignin- hemicellulose-free) celluloses, such as in highly bleached pulps, bacterial cellulose, or cotton linters. While oxidized groups—carbonyls (CO) carboxyls (COOH)—have been recognized initiators yellowing, they are generally always found together; thus, their effects permanently superimposed real-world cellulose. For this reason, individual contributions could not be reliably...
The cleavage of the C2–C3 bond in building units 1 → 4-linked polysaccharides by periodate formally results two aldehyde units, which are present several masked forms. structural elucidation such polysaccharide dialdehydes remains a big challenge. Since derivatives increasingly applied materials technology, unveiling exact structure is utmost importance. To address this issue for xylan, dialdehyde xylan (DAX, oxidation degree 91.5%) has been synthesized as water-soluble polymer. ATR-FTIR...
The irradiation of pulp is interest from different perspectives. Mainly it required when a modification cellulose needed. Irradiation could bring many advantages, such as chemical savings and, therefore, cost and reduction in environmental pollutants. In this account, dissociated celluloses were analyzed before after by electron beaming. focus the analysis was oxidation hydroxyl groups to carbonyl carboxyl degradation causing decrease molar mass. For that purpose, samples labeled with...
Fibers resulting from pulping of wood are negatively charged by nature. Both the cellulose and hemicelluloses contribute to anionicity. The negative charge cellulosic material can be reversed with same reagent commonly used for cationization starch. In this study, a bleached Kraft pulp was cationized in systems different water-miscible organic solvents. Replacing 90% water isopropanol particularly tetrahydrofuran yielded higher degrees substitution increased reaction efficiency. degree...
Celluloses from different origins were dissolved stepwise in N,N-dimethylacetamide/lithium chloride (9% v/w; DMAc/LiCl) with the aim to study time course of dissolution process, completeness fractions, possible discrimination effects, and differences between celluloses. Cellulosic pulps both annual plants wood species analyzed. The obtained fractions subject gel permeation chromatography (GPC) multiple detection monitor development molecular mass distribution (MMD), mass, recovered mass....
Different pulp samples were irradiated by three energy sources: plasma, electron beaming, and γ radiation. The effect of increased exposure to irradiation was studied multidetector gel permeation chromatography with fluorescence labeling carbonyl groups quantify changes the cellulose. Whereas plasma treatment had no effect, for gamma beam degradation primarily affects high molar mass area. Kinetic calculations based on DPw performed. They show close-to-linear relations slopes in same order...
We present wetting, hygroscopicity, and interfacial activity of hemicellulose with respect to etherification contrast it their potential as modifiers, which is demonstrated by oil-in-water emulsification containing up 60 vol% the oil phase. Tunable amphiphilicity hardwood softwood hemicelluloses, xylans, galactoglucomannans, respectively, was accomplished via controlled etherification. A series degree substitution (DS) hydroxypropylated 3-butoxy-2-hydroxypropylated ("butylated") grades...
Ammonium citrate was introduced to paper conservation as an additive for what might be called "enhanced" washing, viewed a more powerful brightening agent than washing alone and less aggressive bleaching. We tested its effect on cellulose using two historical papers one filter immersed in solutions of ammonium (pH 5.5; pH 8.5), citric acid 1.8), calcium hydroxide (both at 9.0). One set washed exclusively these solutions, second subsequently received alkaline reserve. determined the CIE...
The water unextractable arabinoxylans (WUAX) contain beneficial phenolic compounds that can be used for food rather than animal feed. antioxidant activities of defatted rice bran obtained by xylanase-aided extraction is reported herein. chemical and molecular characteristics extracted fractions were investigated.The WUAX hydrolysate precipitated 0-60% ethanol (F60), 60-90% (F6090), more 90% (F90) had decreased molar masses with increasing concentration. interest, F60 F6090, contained 75%...
The present study compares five oxidative bleaching treatments (calcium hypochlorite, hydrogen peroxide in two concentrations, light bleaching, and potassium permanganate) reductive (sodium borohydride tert-butylaminoborane) with each other. Their impact was investigated on pure cellulose (Whatman filter paper) different historic rag papers. parameters to evaluate the process are brightness, molecular weight, carbonyl carboxyl group content. bleached samples were analyzed directly after...
Coatings fulfill an important function in providing functionality and service life to wood surfaces. In the present study, potential of nanocellulosic fillers toward improving waterborne coating mechanics is evaluated using free-standing films. At 2% filler content, significant improvements static dynamic mechanical properties were observed. The extent these was different depending on whether high-aspect-ratio cellulose nanofibrils short nanocrystals used. Chemical surface modification did...