Search results for: Volker Ribitsch

Items from 1 to 20 out of 53 results

article

Monitoring the kinetics of biocatalytic removal of the endocrine disrupting compound 17α-ethinylestradiol from differently polluted wastewater bodies

Raffael Rathner, Sabine Petz, Gábor Tasnádi, Martin Koller, more

Journal of Environmental Chemical Engineering > 2017 > 5 > 2 > 1920-1926

Horseradish peroxidase (HRP)-mediated degradation of 17α-ethinylestradiol (EE2) in artificial wastewater samples was studied qualitatively (HPLC–MS) and quantitatively (HPLC-UV). Experiments were performed with two different HRP isoenzyme variants either of herbal origin (HRPc) or expressed by recombinant yeasts (C1A_6). Experiments were performed under different pH- and salinity conditions, with...

article

Gold nanoparticles in the engineering of antibacterial and anticoagulant surfaces

Heike M.A. Ehmann, Doris Breitwieser, Sascha Winter, Christian Gspan, more

Carbohydrate Polymers > 2015 > 117 > Complete > 34-42

Simultaneous antibacterial and anticoagulant surfaces have been prepared by immobilization of engineered gold nanoparticles onto different kinds of surfaces. The gold nanoparticle core is surrounded by a hemocompatible, anticoagulant polysaccharide, 6-O chitosan sulfate, which serves as reduction and stabilizing agent for the generation of gold nanoparticles in a microwave mediated reaction. The particle...

article

Antifouling coating of cellulose acetate thin films with polysaccharide multilayers

Tamilselvan Mohan, Rupert Kargl, Karin Eva Tradt, Martin R. Kulterer, more

Carbohydrate Polymers > 2015 > 116 > Complete > 149-158

In this investigation, partially deacetylated cellulose acetate (DCA) thin films were prepared and modified with hydrophilic polysaccharides with the layer-by-layer (LbL) technique. As polysaccharides, chitosan (CHI) and carboxymethyl cellulose (CMC) were used. DCA thin films were manufactured by exposing spin coated cellulose acetate to potassium hydroxide solutions for various times. The deacetylation...

chapter

Optochemical sensors based on polymer nanofibers with ultra-fast response characteristics

Christian Wolf, Martin Tscherner, Stefan Kostler, Volker Ribitsch

IEEE SENSORS 2014 Proceedings > 950 - 953

2014 IEEE Sensors

For most “simple” analytes (e.g. oxygen), the actual sensing element of optochemical sensors consists of a luminescent dye embedded in a polymeric matrix whose luminescence intensity and decay time correlates with the analyte concentration. The response characteristics of these sensors are limited by the time requirement for diffusion and equilibration of the analyte in the bulk of the matrix material...

article

Interaction and enrichment of protein on cationic polysaccharide surfaces

Tamilselvan Mohan, Gerald Findenig, Stefan Höllbacher, Christoph Cerny, more

Colloids and Surfaces B: Biointerfaces > 2014 > 123 > C > 533-541

In this study, the interaction of fluorescein isothiocyanate functionalized bovine serum albumin (FITC-BSA) with cellulose surfaces decorated with trimethyl chitosan (TMC) is investigated. Two types of TMC, one exhibiting a lower and one with a higher degree of cationization are used for protein adsorption. The adsorption is carried out at different pH values and concentrations of the protein solution...

article

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

Mioara Drobota, Zdenka Persin, Lidija Zemljic, Tamiselvan Mohan, more

Open Chemistry > 2013 > 11 > 11 > 1786-1798

The functionalization of poly(ethylene terephthalate) (PET) surface films by reactions with multifunctional amines such as triethylenetetramine (TETA), and tetraethylenepentamine (TEPA) was investigated. For the functionalization of PET films surface we used a new way of treatment, a “sandwich model”. Physical-chemical properties of functionalized PET films were analysed. Qualitative and quantitative...

article

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

Mioara Drobota, Zdenka Persin, Lidija Zemljic, Tamiselvan Mohan, more

Open Chemistry > 2013 > 11 > 11 > 1786-1798

article

In situ preparation of silver nanocomposites on cellulosic fibers – Microwave vs. conventional heating

Doris Breitwieser, Mojtaba Mirhosseini Moghaddam, Stefan Spirk, Mostafa Baghbanzadeh, more

Carbohydrate Polymers > 2013 > 94 > 1 > 677-686

A green approach for the preparation of silver nanocomposites on viscose fibers using microwave and conventional heating is presented. Reduction of silver nitrate is induced by addition of 6-O chitosan sulfate (S-Chi) in aqueous media which provides steric protection and electrostatic stabilization to prevent agglomeration of the nanoparticles. The particles are formed in close spatial proximity to...

article

Oxidized cellulose—Survey of the most recent achievements

Sergiu Coseri, Gabriela Biliuta, Bogdan C. Simionescu, Karin Stana-Kleinschek, more

Carbohydrate Polymers > 2013 > 93 > 1 > 207-215

The functionalization and particularly the oxidation of cellulose is an intriguing and challenging topic due to the presence of multiple reactive sites, which can undergo specific reactions. The variety of the oxidizing agents used to improve the selectivity and yields of these transformations is illustrated by the steadily growing of the number of publications and patents reported. This paper is...

article

Enzymatic digestion of partially and fully regenerated cellulose model films from trimethylsilyl cellulose

Tamilselvan Mohan, Rupert Kargl, Aleš Doliška, Heike M.A. Ehmann, more

Carbohydrate Polymers > 2013 > 93 > 1 > 191-198

Partially and fully regenerated cellulose model films from trimethylsilyl cellulose (TMSC) were prepared by a time dependent regeneration approach. These thin films were characterized with contact angle measurements and attenuated total reflectance infrared spectroscopy (ATR-IR). In order to get further insights into the completeness of the regeneration we studied the interaction of cellulase enzymes...

article

Chitosan–silane sol–gel hybrid thin films with controllable layer thickness and morphology

Stefan Spirk, Gerald Findenig, Ales Doliska, Victoria E. Reichel, more

Carbohydrate Polymers > 2013 > 93 > 1 > 285-290

The preparation of thin films of chitosan–silane hybrid materials by combining sol–gel processing and spin coating is reported. A variety of silanes can be used as starting materials for the preparation of such thin films, namely tetraethoxysilane, tri-tert-butoxysilanol, trimethylethoxysilane, p-trifluoromethyltetra-fluorophenyltriethoxysilane, trivinylmethoxysilane, (methoxymethyl)trimethyl-silane,...

article

Viscoelastic properties of fibrinogen adsorbed onto poly(ethylene terephthalate) surfaces by QCM-D

Aleš Doliška, Volker Ribitsch, Karin Stana Kleinschek, Simona Strnad

Carbohydrate Polymers > 2013 > 93 > 1 > 246-255

In presented study a new approach using QCM-D for biocompatibility determination was introduced. The adsorption of fibrinogen on PET and modified PET surfaces was monitored in situ using QCM-D. Protein layer thicknesses were estimated on the basis of a Voight based viscoelastic model. The hydrophilicities and morphologies of the surfaces were investigated using a goniometer and AFM. The results showed...

article

2D crystalline protein layers as immobilization matrices for the development of DNA microarrays

Sylvia R. Scheicher, Birgit Kainz, Stefan Köstler, Norbert Reitinger, more

Biosensors and Bioelectronics > 2013 > 40 > 1 > 32-37

There is a growing demand for functional layers for the immobilization of (bio)molecules on different kinds of substrates in the field of biosensors, microarrays, and lab-on-a-chip development. These functional coatings should have the ability to specifically bind (bio)molecules with a high binding efficiency, while showing low unspecific binding during the following assay. In this paper we present...

article

Molecular simulation of surface reorganization and wetting in crystalline cellulose I and II

Reinhard J. Maurer, Alexander F. Sax, Volker Ribitsch

Cellulose > 2013 > 20 > 1 > 25-42

Cellulose is one of the most versatile substances in the world. Its immense variety of applications was in recent years complemented by nanotechnological applications such as cellulose nanoparticle dressed surfaces for filtration purposes or cellulose matrices for microelectronics. The fabrication of such complex materials asks for thorough understanding of the surface structure and its interactions...

article

Comparison study of TEMPO and phthalimide-N-oxyl (PINO) radicals on oxidation efficiency toward cellulose

Gabriela Biliuta, Lidija Fras, Mioara Drobota, Zdenka Persin, more

Carbohydrate Polymers > 2013 > 91 > 2 > 502-507

Regenerated cellulose fibers, type viscose, have been oxidized with sodium hypochlorite and catalytic amounts of sodium bromide by using two different protocols: first, involving the presence of 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) and second, employing N-hydroxyphthalimide (NHPI). The reactions were carried out at room temperature and pH=10.5 for 2.5h. Viscose oxidized samples were...

article

Functional Patterning of Biopolymer Thin Films Using Enzymes and Lithographic Methods

Rupert Kargl, Tamilselvan Mohan, Stefan Köstler, Stefan Spirk, more

Advanced Functional Materials > 23 > 3 > 308 - 315

Two different lithographic techniques for the patterning of thin biopolymer films are developed. The first method is based on using a microstructured elastomeric mold for the structuring of thin films of regenerated cellulose. The thin films are manufactured by spin‐coating of trimethylsilyl cellulose (TMSC) and subsequent regeneration. The microchannels formed by the mold and the cellulose film are...

article

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

Mioara Drobota, Zdenka Persin, Lidija Fras Zemljic, Tamiselvan Mohan, more

Central European Journal of Chemistry > 2013 > 11 > 11 > 1786-1798

article

Screen-printed polymer waveguides for integrated optics

Martin Sagmeister, Bernhard Lamprecht, Elke Kraker, Stefan Köstler, more

Applied Physics B > 2013 > 111 > 4 > 647-650

We demonstrate screen printing of polymer waveguides on rigid and flexible substrates. The waveguides are characterized by optical microscopy and propagation losses are determined by cut-back measurements. Furthermore, the efficiency of light coupling using fluorescent molecules within the waveguides is measured with regard to the application feasibility in sensor systems. It is shown that minimum...

article

Investigations Into Amphiphilic Chitosan: Properties and Availability of Original and Newly Introduced Functional Groups

Hubert Fasl, Lidija Fras Zemljič, Walter Goessler, Karin Stana‐Kleinschek, more

Macromolecular Chemistry and Physics > 213 > 15 > 1582 - 1589

The accessibility of functional groups of 3,6‐O‐chitosansulfate in water is studied using conductometric and polyelectrolyte titration techniques. These studies reveal the good accessibility of protonated amino groups following conductometric titrations and pH dependency on the accessibility of negatively charged sulfate groups following polyelectrolyte titrations. In addition, the influence of negatively...

article

Watching cellulose grow – Kinetic investigations on cellulose thin film formation at the gas–solid interface using a quartz crystal microbalance with dissipation (QCM-D)

Tamilselvan Mohan, Stefan Spirk, Rupert Kargl, Aleš Doliška, more

Colloids and Surfaces A: Physicochemical and Engineering Aspects > 2012 > 400 > Complete > 67-72

The conversion of trimethylsilyl cellulose (TMSC) to cellulose films via acid vapor hydrolysis is investigated at the gas solid interface in situ, in real time and under ambient conditions using the QCM-D technique. For this purpose, a permanent flow of gaseous HCl is employed which reacts with TMSC spun on QCM sensors to form cellulose films. The kinetics behind this reaction is elucidated and reveals...

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ELECTROKINETIC PROPERTIES (6)
QUARTZ CRYSTAL MICROBALANCE (6)
AFM (5)
WETTABILITY (5)
AMINOLYSIS (3)
CELLULOSE FIBERS (3)
CHITOSAN (3)
COLLAGEN IMMOBILIZATION (3)
CONTACT ANGLE (3)
PET (3)
ADSORPTION (2)
CELLULOSE MODEL FILMS (2)
IMMOBILIZATION MATRIX (2)
NANOFILTRATION (2)
OPTOCHEMICAL SENSOR (2)
OXYGEN SENSOR (2)
POLYSACCHARIDES (2)
PROTEIN ADSORPTION (2)
QCM-D (2)
REGENERATED CELLULOSE FIBRES (2)
S-LAYER PROTEIN (2)
SURFACE MODIFICATION (2)
TEMPO (2)
XPS (2)
ZETA POTENTIAL (2)
ZETA-POTENTIAL (2)
N-METHYLMORPHOLINE-N-OXIDE (1)
17Α-ETHINYLESTRADIOL (1)
ACTIVE LAYER (1)
ADSORPTION PROPERTIES (1)
AMMONIA PLASMA (1)
AMORPHOUS CARBON FILMS (1)
AMPHIPHILES (1)
ANTICOAGULANT ACTIVITY (1)
ANTIMICROBIAL ACTIVITY (1)
ANTIMICROBIAL SURFACE COATINGS (1)
ANTIMICROBIAL SURFACES (1)
ATOMIC FORCE MICROSCOPY (1)
ATR-IR (1)
ATTENUATED TOTAL REFLECTANCE INFRARED SPECTROSCOPY (1)
BIOCOMPATIBILITY (1)
BIOMATERIAL (1)
BSA ADSORPTION (1)
CAPILLARY ELECTROPHORESIS (1)
CAPILLARY ZONE ELECTROPHORESIS (1)
CARBOHYDRATES (1)
CARBON DIOXIDE (1)
CARBOXYMETHYL CELLULOSE (1)
CELLULASE (1)
CELLULOSE (1)
CELLULOSE ACETATE (1)
CELLULOSE ACETATE THIN FILMS (1)
CELLULOSE FIBRES (1)
CELLULOSE MODEL SURFACE (1)
CELLULOSE MODEL SURFACES (1)
CELLULOSE OXIDATION (1)
CELLULOSE PRE-TREATMENT (1)
CELLULOSE SURFACE (1)
CELLULOSE/WATER INTERFACE (1)
CHITOSAN SULFATE (1)
DLS (1)
DNA MICROARRAY (1)
DONNAN (1)
DUAL LUMINOPHORE REFERENCING (DLR) (1)
ELECTRICAL RESPONSE (1)
ELECTROPHORETIC MOBILITIES (1)
ELECTROSPINNING (1)
ELLIPSOMETRY (1)
ENCAPSULATION (1)
ENDOCRINE DISRUPTING COMPOUNDS (1)
ENZYMATIC DEGRADATION (1)
FIBER OPTIC SENSOR (1)
FIBRE FORMING POLYMERS (1)
FIBRINOGEN (1)
FIXED CHARGE (1)
FIXED CHARGE DENSITY (1)
FLUORESCENCE (1)
FLUORESCENCE MICROSCOPE (1)
FOAM (1)
FUNCTIONAL COATINGS (1)
GALACTOGLUCOMANNAN (1)
GEMINI SURFACTANTS (1)
GLUCOMANNAN (1)
GOLD NANOPARTICLES (1)
GREEN NANOSCIENCE (1)
HAEMOCOMPATIBILITY (1)
HORSERADISH PEROXIDASE (1)
HUMAN SERUM ALBUMIN (1)
HYBRID MATERIALS (1)
HYDROGEN BONDS (1)
HYDROGEN PEROXIDE (1)
INTERFACE REACTION (1)
ION MOBILITY (1)
IONIC LIQUIDS (1)
KINETICS (1)
LAPONITE (1)
LAYER STABILITY (1)
LAYER-BY-LAYER ASSEMBLY (1)
LAYER-BY-LAYER DEPOSITION (1)
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Colloids and Surfaces A: Physicochemical and Engineering Aspects (9)
Carbohydrate Polymers (8)
Cellulose (3)
Material Research Innovations (3)
Advanced Functional Materials (2)
Analytica Chimica Acta (2)
Biomacromolecules (2)
Biosensors and Bioelectronics (2)
Journal of Colloid And Interface Science (2)
Langmuir (2)
Open Chemistry (2)
ACS Applied Materials & Interfaces (1)
Applied Physics B (1)
Central European Journal of Chemistry (1)
Chemical Engineering Journal (1)
Colloid and Polymer Science (1)
Colloids and Surfaces B: Biointerfaces (1)
Journal of Environmental Chemical Engineering (1)
Journal of Membrane Science (1)
Macromolecular Chemistry and Physics (1)
Macromolecular Symposia (1)
Nederlands Tijdschrift voor Diabetologie (1)
Progress in Organic Coatings (1)
Sensors & Actuators: B. Chemical (1)
The Journal of Physical Chemistry B (1)
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INFONA - science communication portal

Search results for: Volker Ribitsch

Monitoring the kinetics of biocatalytic removal of the endocrine disrupting compound 17α-ethinylestradiol from differently polluted wastewater bodies

Gold nanoparticles in the engineering of antibacterial and anticoagulant surfaces

Antifouling coating of cellulose acetate thin films with polysaccharide multilayers

Optochemical sensors based on polymer nanofibers with ultra-fast response characteristics

Interaction and enrichment of protein on cationic polysaccharide surfaces

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

In situ preparation of silver nanocomposites on cellulosic fibers – Microwave vs. conventional heating

Oxidized cellulose—Survey of the most recent achievements

Enzymatic digestion of partially and fully regenerated cellulose model films from trimethylsilyl cellulose

Chitosan–silane sol–gel hybrid thin films with controllable layer thickness and morphology

Viscoelastic properties of fibrinogen adsorbed onto poly(ethylene terephthalate) surfaces by QCM-D

2D crystalline protein layers as immobilization matrices for the development of DNA microarrays

Molecular simulation of surface reorganization and wetting in crystalline cellulose I and II

Comparison study of TEMPO and phthalimide-N-oxyl (PINO) radicals on oxidation efficiency toward cellulose

Functional Patterning of Biopolymer Thin Films Using Enzymes and Lithographic Methods

Chemical modification and characterization of poly(ethylene terephthalate) surfaces for collagen immobilization

Screen-printed polymer waveguides for integrated optics

Investigations Into Amphiphilic Chitosan: Properties and Availability of Original and Newly Introduced Functional Groups

Watching cellulose grow – Kinetic investigations on cellulose thin film formation at the gas–solid interface using a quartz crystal microbalance with dissipation (QCM-D)

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