Materials Literature
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Abstract A polymeric surfactant based on carboxymethyl cellulose and alkyl poly(etheroxy) acrylate (CMC‐A9) was used in ultrasonically irradiated emulsion polymerization of styrene. Polystyrene nanoparticles (30–60 nm) with high molecular weight were prepared. Compared with the conventional emulsion polymerization, th…
Ähnlich und doch anders: Die Kristallstrukturen von sechs Alkoholsolvaten des Tris(2-picolylamin)eisen(II)-dichlorids (siehe Formel) sind bei 200 K sehr ähnlich, ihr Spin-Crossover- und Phasenumwandlungsverhalten unterscheidet sich aber deutlich. Konsequenzen dieser Beobachtung für das Kristall-Engineering werden erör…
Abstract We have successfully prepared a series of blend membranes from cellulose and soy protein isolate (SPI) in NaOH/thiourea aqueous solution by coagulating with 5 wt % H 2 SO 4 aqueous solution. The structure and properties of the membranes were characterized by Fourier transform infrared spectroscopy, ultraviole…
The structures of ${\text{Al}}_{12}\mathrm{C}$ and ${\text{Al}}_{12}{\mathrm{C}}^{\ensuremath{-}}$ clusters are studied by using the density functional theory. We find that the charging on the icosahedral ${\text{Al}}_{12}\mathrm{C}$ cluster drives the carbon atom from the center of the cluster to its surface. The opt…
Abstract The thermal behavior of an acrylic binder resin used in back coatings for textile applications was studied. The influence of the crystalline form of the fire‐retardant additive on the thermal behavior was investigated. This resin formed a carbon char during its thermal degradation, so it may be assumed that i…
Abstract Nanocomposites of nanosized CaCO 3 /polypropylene–ethylene copolymer (PPE) and nanosized CaCO 3 /PPE/styrene–butadiene–styrene (SBS) were prepared by using a two‐roll mill and a single‐screw extruder. By adding CaCO 3 nanoparticles into the PPE matrix, the toughness of the matrix substantially improved. At a…
Pt2-Hantel geclustert: Bei der Reaktion von Platinnitrat mit konzentrierter Schwefelsäure bei 350 °C bildet sich das tiefrote Oxidsulfat (NH4)Pt3O2(SO4)3, in dem sechs Pt26+-Hanteln durch Oxidionen und Sulfatgruppen zu dem Clusteranion [Pt12O8(SO4)12]4− verknüpft sind (siehe Bild). Der Grundkörper dieses Anions entspr…
The aim of this work is the production of fibers from biodegradable polymers to obtain 3D scaffolds for tissue engineering of hard tissues. The scaffolds required for this highly demanding application need to have, as well as the biological and mechanical characteristics, a high degree of porosity with suitable dimens…
The highly chemo-, regio-, and diastereoselective and stereospecific epoxidation of various allylic alcohols with only one equivalent of hydrogen peroxide in water can be efficiently catalyzed by the dinuclear peroxotungstate, K2[[W(=O)(O2)2(H2O)]2(mu-O)].2H2O (I). The catalyst is easily recycled while maintaining its…
Platinum dumbbells: The reaction of platinum nitrate with concentrated sulfuric acid at 350 °C leads to the deep red oxide–sulfate (NH4)Pt3O2(SO4)3, in which six [Pt2]6+ dumbbells are linked by oxide ions and sulfate groups to the novel cluster anion [Pt12O8(SO4)12]4− (see picture). The structure of the core of this a…
Abstract The effect of stearic acid modification on the dispersity of silica nanoparticles and the adhesion between the filler and polymer matrix with stearic acid concentration were investigated. The wettability of silica nanoparticles was improved by the addition of stearic acid. The presence of adsorbed stearic aci…
Phonons are calculated for single wall carbon nanotubes. Eigenvalues and eigenvectors are presented for armchair and zig-zag tubes. The model contains just three adjustable spring constants: two for first and second nearest neighbor directed bonds, and a third for radial bond-bending interactions. There are four low f…
We report an infrared reflection spectroscopy study of La$_{1/2}$Ca$_{1/2}$MnO$_3$ over a broad frequency range and temperature interval which covers the transitions from the high temperature paramagnetic to ferromagnetic and, upon further cooling, to antiferromagnetic phase. The structural phase transition, accompani…
The energetics of Schottky defects in 123 cuprate superconductor series, $\rm REBa_2Cu_3O_7$ (where RE = lanthandies) and $\rm YAE_2Cu_3O_7$ (AE = alkali-earths), were found to have unusual relations if one considers only the volumetric strain. Our calculations reveal the effect of non-uniform changes of interatomic d…
We use first principles methods to study static and dynamical mechanical properties of the ferroelectric polymer Poly(vinylidene fluoride) (PVDF) and its copolymer with trifluoro ethylene (TrFE). We use density functional theory [within the generalized gradient approximation (DFT-GGA)] to calculate structures and ener…
The structure of disordered GaN:O films grown by ion-assisted deposition is investigated using x-ray absorption near-edge spectroscopy and Raman spectroscopy. It is found that between 4 and 21 % of the nitrogen in the films is in the form of molecular N_2 that interacts only weakly with the surrounding matrix. The ani…
Recently we have shown that $YbInCu_4$ and related compounds present a solid state Pomeranchuk effect. These systems have a first order volume transition where a local moment phase coexists with a renormalized Fermi liquid in analogy with $^3He$ at its melting curve. We demonstrate here experimentally that the solid s…
Time dependent STM has been used to evaluate step fluctuations as a function of temperature (300-450 K) on Ag(111) films grown on mica. The temporal correlation function scales as a power law in time, t^1/n with measured values of 1/n varying over a range of 0.19 pm 0.04 to 0.29 pm 0.04 with no dependence on temperatu…
The magnetotransport properties of an ${\mathrm{In}}_{0.95}{\mathrm{Mn}}_{0.05}\mathrm{As}$ thin film grown by metal-organic vapor phase epitaxy were measured. Resistivity was measured over the temperature range of 5 to $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The resistivity decreased with increasing temperature f…
We analyze damage nucleation and localization in the random fuse model with strong disorder using numerical simulations. In the initial stages of the fracture process, damage evolves in an uncorrelated manner, resembling percolation. Subsequently, as the damage starts to accumulate, current enhancement at the tips of…