A5006710830- Advanced Polymer Synthesis and Characterization
- Surfactants and Colloidal Systems
- X-ray Diffraction in Crystallography
- Polymer Nanocomposites and Properties
- X-ray Spectroscopy and Fluorescence Analysis
- Calcium Carbonate Crystallization and Inhibition
- Cultural Heritage Materials Analysis
- Polymer crystallization and properties
- Mesoporous Materials and Catalysis
- Iron oxide chemistry and applications
- Building materials and conservation
- Enzyme Structure and Function
- Glass properties and applications
- Crystal Structures and Properties
- Material Properties and Processing
- biodegradable polymer synthesis and properties
- Clay minerals and soil interactions
- Nanoparticle-Based Drug Delivery
- Dendrimers and Hyperbranched Polymers
- Thermal and Kinetic Analysis
- Blood properties and coagulation
- Electrostatics and Colloid Interactions
- Quantum Dots Synthesis And Properties
- Polymer Surface Interaction Studies
- Silicone and Siloxane Chemistry
Karlsruhe Institute of Technology
1996-2007
Organisation internationale de police criminelle
2004
European Synchrotron Radiation Facility
2003
Max Planck Institute for Polymer Research
2002
Time-resolved synchrotron small-angle X-ray scattering (SAXS) studies were performed to investigate the unseeded formation and growth of colloidal calcium carbonate particles. Equimolar aqueous solutions CaCl2·2H2O Na2CO3 rapidly mixed in a stopped-flow apparatus, SAXS data recorded using an image-intensified CCD detector. It is shown that allows studying those processes situ, with very good time resolution. can provide unsurpassed real-time information about particle size, shape,...
We use small-angle x-ray scattering (SAXS) as a tool to study the binding of proteins spherical polyelectrolyte brushes (SPB) in situ. The SPB consists solid core \ensuremath{\sim} 100 nm diam onto which long chains [poly(styrene sulfonic acid, PSS) and poly(acrylic PAA)] have been densely grafted. used this investigation, Bovine Serum Albumine (BSA) Pancreatic Ribonuclease A (RNase A), adsorb strongly these if ionic strength is low despite their negative charge. Virtually no adsorption...
The transformation of amorphous colloidal calcium carbonate into single microcrystals was observed in supersaturated solutions situ. observations are done by simultaneous time-resolved small-angle and wide-angle X-ray scattering experiments (TR-SAXS/WAXS) at a third generation synchrotron source. TR-SAXS/WAXS demonstrates that the particles generated reaction Ca2+ CO32- ions amorphous. these CaCO3 proceeds via dissolution subsequent heterogeneous nucleation crystalline modification on walls...
An investigation of the adsorption nonionic surfactant Triton X-405 on a polystyrene latex by use small-angle X-ray scattering (SAXS) is given. Since particles only have low contrast toward water whereas electron density added rather high, gradual buildup layer can be monitored with good sensitivity. The matched adding glycerol or sucrose to dispersion medium. Thus, detailed study adsorbed variation possible. Small differences in patterns depending nature agent (glycerol and sucrose) could...
Small-angle X-ray scattering (SAXS) is a well-established, versatile technique for the analysis of nanoscale structures and dimensions, e.g., in liquid dispersions, thin solid objects or powder samples. When combined with wide-angle (WAXS), complementary information about atomic structure can be obtained. SAXS experiments traditionally require dedicated instruments to achieve desired angular resolution, sensitivity, stability, speed measurement. Here we demonstrate how multi-functional...
A compact laboratory X-ray scattering platform that uniquely enables for high-performance ultra-small-angle (USAXS), small- and wide-angle (SAXS/WAXS), total (atomic pair distribution function analysis; PDF) experiments was developed. It covers Bragg spacings from sub-Angstroms to 1.7 μm, thus allowing the analysis of dimensions complex structures in (nano-)materials on multiple length scales. The accessible vector q-range spans over almost five decades (qmin = 0.0036 nm-1, qmax 215 nm-1),...
Abstract Small‐angle X‐ray scattering (SAXS) was applied for the structural analysis of an industrial polymer dispersion in water (synthetic latex). For preparation spherical latex particles under investigation, butadiene, styrene, and acrylic acid were used as monomers a seeded emulsion polymerization process. The product is widely being film‐forming agent coatings paper‐making industry. It demonstrated that by measuring SAXS curves at different contrasts overall particle size, mass...
X-ray diffraction and scattering on a single multipurpose platform have been used to probe the structure, composition, thermal behavior of TiO 2 nanoparticles ranging in size from 1 10 nm. Ambient non-ambient Bragg diffraction, small-angle (SAXS), as well total pair-distribution function (PDF) analysis are combined obtain comprehensive picture samples. At these ultrasmall particle-size dimensions, SAXS PDF prove powerful distinguishing salient features materials, particular distribution...
Abstract Spherical NaYF 4 upconversion nanocrystals with mean radii of about 5 and 11 nm are observed to form colloidal crystals, i.e., 3D assemblies the particles long‐range order. The crystals larger directly in solution when dispersions toluene stored at room temperature for several weeks. Crystallization smaller takes place their hexane slowly dried elevated temperatures. formation structure studied by small‐angle X‐ray scattering (SAXS). SAXS measurements show that as well assemble into...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of Spatial Inhomogeneities in Swollen Latex Particles by Small-Angle X-ray Scattering: The Wall-Repulsion Effect RevisitedJ. Bolze and M. BallauffCite this: Macromolecules 1995, 28, 22, 7429–7433Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://pubs.acs.org/doi/10.1021/ma00126a022https://doi.org/10.1021/ma00126a022research-articleACS PublicationsRequest reuse...
Summary: The inner structure of polyurethane latex particles has been studied in situ using small-angle X-ray scattering (SAXS). From contrast variation SAXS measurements evidence could be given that the dispersed are semi-crystalline. semi-crystalline gives a strong contribution to measured intensities an intermediate range vectors. This contribution, which is independent adjusted contrast, separated and long period lamellar thus determined quantitatively 11 nm. In addition, it was found...
A structural investigation of poly(methyl methacrylate) (PMMA) latex particles swollen by styrene is given. The goal this study to detect whether the polymer chains will be depleted at surface for entropic reasons (wall-repulsion effect) or enthalpic effects prevail driving nonpolar swelling agent into core particles. By use small-angle X-ray scattering in conjunction with contrast variation, radial structure could determined high resolution. In a layer about 1 nm thickness has been found...
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Small-angle X-ray scattering (SAXS) applied to protein solutions has become an accepted and rapidly growing structural biology technique [1].Measurements can be done under native conditions, while varying concentration, pH, ionic strength or temperature.The data provide information about molecular weight, size, shape stability of the biomolecules ultimately allow for a low resolution envelope reconstruction.The is complementary that obtained from XRD, NMR cryo-EM.Although setup SAXS easy in...