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Reversible Deformation und irreversible Netzwerkentschlaufung von Polymerschmelzen / Reversible Deformation and Irreversible Network Disentanglement of Polymer Melts
Neuheiten/Products
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Die nichtlinearen rheologischen Eigenschaften von viskoelastischen Tensidlösungen und ihre quantitative Beschreibung durch das Giesekus Modell / The Nonlinear Rheological Response of Viscoelastic Surfactant Solutions and its Quantitative Description by the Giesekus Model
Zürich ist immer eine Reise wert / Zürich is always worth the trip
Experimentelle Untersuchung von ER-Suspensionen im Squeeze-mode / Experimental Investigation of ER-Suspensions in the Squeeze Mode
Magneto-optical effect in the weak ferromagnetsLaMO3(M= Cr, Mn, and Fe)
It is shown that antiferromagnetic spin order coupled through the spin-orbit interaction with the lattice distortion can lead to a nonvanishing ferromagnetic component of the orbital magnetization and strong optical nonreciprocity in transition-metal perovskite oxides with orthorhombic structure. This magneto-optical…
Effects of Adding Copper(II) Salt to Organosulfur Cathodes for Rechargeable Lithium Batteries
We report the preliminary analysis of a new cathode material and the performance of secondary lithium cells which contain it. The material is comprised of an organosulfur compound, 2,5‐dimercapto‐1,3,4‐thiadiazole (DMcT), doped with a copper(II) salt in a poly(aniline) matrix. Secondary lithium cells which use this ma…
Refined Relationships between Chemical Composition of Dioctahedral Fine-Grained Mica Minerals and Their Infrared Spectra within the OH Stretching Region. Part I: Identification of the OH Stretching Bands
Abstract A large and representative collection of clay-size dioctahedral mica minerals differing in their chemical compositions has been studied by infrared (IR) spectroscopy in the OH stretching vibration region. Decomposition of the IR spectra in the individual OH bands has provided unambiguous identification of the…
Slip energy barriers in aluminium and implications for ductile-brittle behaviour
We consider the ductile-brittle behaviour of aluminium in the framework of the Peierls-model analysis of dislocation emission from a crack tip. To this end, we perform first-principles quantum mechanical calculations for the unstable stacking energy γus of aluminium along the Shockley partial slip route. Our calculati…
Self-diffusion of adatoms, dimers, and vacancies on Cu(100)
We use ab initio static relaxation methods and semi-empirical molecular-dynamics simulations to investigate the energetics and dynamics of the diffusion of adatoms, dimers, and vacancies on Cu(100). It is found that the dynamical energy barriers for diffusion are well approximated by the static, 0 K barriers and that…
Young's Modulus, Flexural Strength, and Fracture of Yttria‐Stabilized Zirconia versus Temperature
The flexural strength and elastic modulus of cubic zirconia that was stabilized with 6.5 mol% yttria was determined in the temperature range of 25°–1500°C in air. Specimens were diamond machined from both hot‐pressed and sintered billets that were prepared from alkoxy‐derived powders. The flexural strength of the hot‐…
Semiempirical Correlation between Optical Band Gap Values of Oxides and the Difference of Electronegativity of the Elements. Its Importance for a Quantitative Use of Photocurrent Spectroscopy in Corrosion Studies
A semiempirical correlation between the optical band gap of binary oxides and the difference of electronegativity between the oxygen and metallic elements (Pauling's extraionic energy) is proposed. In the frame of the proposed correlation an estimate of the repulsive term in the total lattice energy of ionic oxides is…
Exfoliated−Restacked Phase of WS2
A modified method for obtaining large quantities of exfoliated single layers of WS2 is reported. The restacked WS2 obtained from the precipitation of the single layers is metastable with respect to 2H-WS2 with an apparent activation energy of 82.4 kJ/mol, and a conversion temperature of 207 °C at 5 °C/min. Pressed pel…
Thermoplastic nanocomposites filled with wheat straw cellulose whiskers. Part II: Effect of processing and modeling
Abstract The reinforcing effect of cellulose microcrystals, or whiskers, dispersed in a thermoplastic matrix is analyzed. In Part I [ Polym. Compos. , 17, 604 (1996)], the preparation and the characterization of cellulose whiskers obtained from wheat straw were detailed. Composite films were processed by freeze‐drying…