Materials Literature
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A novel method for accurate determination of the carboxyl content in cellulosic materials by fluorescence labeling with 9H-fluoren-2-yl-diazomethane (FDAM) has been developed. The procedure can readily be implemented into a GPC system with RI and MALLS detectors, requiring additional fluorescence detection. The labeli…
Stacking fault tetrahedra (SFTs) are formed under irradiation in fcc metals and alloys. The high number density of SFTs observed suggests that they should contribute to radiation-induced hardening and, therefore, be taken into account when estimating mechanical property changes of irradiated materials. The key issue i…
Stochastic models for the development of cracks in 1 and 2 dimensional objects are presented. In one dimension, we focus on particular scenarios for interacting and non-interacting fragments during the breakup process. For two dimensional objects, we consider only non-interacting fragments, but analyze isotropic and a…
Quasiperiodic Fibonacci-like and fractal Cantor-like single- and multiple-row nanopillar waveguides are investigated theoretically employing the finite difference time domain (FDTD) method. It is shown that resonant modes of the Fibonacci and Cantor waveguides can have a Q-factor comparable with that of a point-defect…
A modeling of the normal state of the p-doped high-temperature superconductors (HTSC's) is presented. This is achieved starting from a more conventional metallic phase for optimal- and overdoping and passing via the underdoped to the insulating state by consecutive orbital selective compressibility-incompressibility t…
We have performed an in situ angle-resolved photoemission spectroscopy (ARPES) on single-crystal surfaces of ${\mathrm{La}}_{0.6}{\mathrm{Sr}}_{0.4}{\mathrm{MnO}}_{3}$ (LSMO) thin films grown on ${\mathrm{SrTiO}}_{3}$ (001) substrates by laser molecular beam epitaxy, and investigated the electronic structure near the…
Electroactive polymers such as polypyrrole (PPy) are highly attractive for a number of biomedical applications, including their use as coatings for electrodes or neural probes and as scaffolds to induce tissue regeneration. Surface modification of these materials with biological moieties is desired to enhance the biom…
The soy protein isolate (SPI)/ Na+ -montmorillonite (MMT) plastics were successfully prepared, and their structures and properties were characterized with X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, thermogravimetric analysis, and tensile testing. The interactions between th…
The electron transfer kinetics of ferrocyanide, potassium hexachloroiridate(III), hexaammineruthenium(III) chloride, and N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) have been examined at basal plane and edge plane pyrolytic graphite electrodes which have been allowed to oxidise in air for various periods of time.…
Stärke gezeigt: Die komplexen Molekülarchitekturen von Pflanzen werden für das Design neuer nanostrukturierter Materialien genutzt. Kohlenstoffbasierte mesoporöse Materialien mit einstellbaren Oberflächen- und Bulkeigenschaften entstehen bei der Niedrigtemperatur-Carbonisierung expandierter natürlicher Stärken, die wi…
A star is born: The complex molecular architecture found in plants is used in the design of new nanostructured materials. Carbon-based mesoporous materials with tunable surfaces and bulk properties can be synthesized by the low-temperature carbonization of expanded natural starches that are in turn prepared by a simpl…
Thermodynamic methods based on conductor-like screening models (COSMO) originated from the use of solvation thermodynamics and computational quantum mechanics. These methods rely on sigma profiles specific to each molecule. A sigma profile is the probability distribution of a molecular surface segment having a specifi…
Electron edge states in graphene in the quantum Hall effect regime can carry both charge and spin. We show that spin splitting of the zeroth Landau level gives rise to counterpropagating modes with opposite spin polarization. These chiral spin modes lead to a rich variety of spin current states, depending on the spin-…
Regions of anomalous localized resonance, such as occurring near superlenses, are shown to lead to cloaking effects. This occurs when the resonant field generated by a polarizable line or point dipole acts back on the polarizable line or point dipole and effectively cancels the field acting on it from outside sources.…
Never-dried native celluloses (bleached sulfite wood pulp, cotton, tunicin, and bacterial cellulose) were disintegrated into individual microfibrils after oxidation mediated by the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical followed by a homogenizing mechanical treatment. When oxidized with 3.6 mmol of NaClO…
We present the results of a muon-spin relaxation (${\ensuremath{\mu}}^{+}$SR) study of magnetic order in the quasi-one-dimensional spin-1/2 molecular chain compound $\mathrm{Cu}({\mathrm{HCO}}_{2}{)}_{2}({\mathrm{C}}_{4}{\mathrm{H}}_{4}{\mathrm{N}}_{2})$. Zero-field ${\ensuremath{\mu}}^{+}$SR measurements at low tempe…
In the thin-film solid oxide fuel cell (SOFC) concept of the German Aerospace Center (DLR) in Stuttgart, the entire membrane electrode assembly (MEA) is deposited onto a porous metallic substrate by an integrated multistep vacuum plasma spray (VPS) process. This concept enables the production of very thin and stable e…
Single-crystalline ${\mathrm{Ba}}_{2}{\mathrm{CoO}}_{4}$ was grown using the floating-zone technique. Single-crystal refinement of x-ray diffraction data indicates that ${\mathrm{Ba}}_{2}{\mathrm{CoO}}_{4}$ has a monoclinic structure with $a=5.9176(13)\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$, $b=7.6192(16)\phantom{\…
Abstract Summary: The reaction of 2,4‐TDI and DEA, as an A 2 + B * B 2 polymerization system towards hyperbranched HPUs was followed using in situ ATR‐FT‐IR spectroscopy. The decrease in intensity of the NCO absorption band of the reactive isocyanate group of 2,4‐TDI along with the formation and growth of the new char…
Abstract Summary: A method is presented that can produce ordered macroporous alginate membranes and microspheres with a relatively narrow pore size distribution as compared to other existing porous alginate matrix generating procedures. The calcium alginate membranes and microspheres obtained were multiporous, and the…