Materials Literature
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„Trockene“ Synthesebedingungen werden bei der Herstellung maßgeschneiderter mesostrukturierter Hybridmaterialien, die aus Dendrimeren (siehe Bild) und [Ti16O16(OEt)32]-Clustern bestehen, benötigt. Sie verhindern die Bildung einer kontinuierlichen anorganischen Phase. Die Form der organischen Einheiten erzwingt eine lo…
A new method for the determination of the classical Preisach’s model distribution function is developed. The proposed method determines numerically the distribution function from classical experimental measurements and does not make any assumption concerning the material type. The Preisach’s triangle is discretised in…
The surface tension of non doped, gallium-doped and boron-doped silicon melts has been measured as a function of temperature in purified argon atmosphere (oxygen partial pressure was less than 10 -8 MPa) using the ring tensiometry technique. In all cases, the surface tension decreases linearly with increasing temperat…
An exact scheme is presented to determine the effective viscosity tensor for periodic arrays of hard spherical particles suspended in a Newtonian fluid. In the highly symmetric case of cubic lattices this tensor is characterized by only two parameters. These parameters are calculated numerically for the three cubic la…
The heterotetrameric recombinant holoenzyme of human protein kinase CK2 was purified to homogeneity. It degraded spontaneously to a stable and fully active state in which the catalytic subunit was about 5 kDa smaller than the wild type. The degraded enzyme was crystallized using polyethylene glycol 3350 as precipitant…
We study a Stefan problem for coarsening of many small particles of solid phase in undercooled liquid phase which includes surface tension and kinetic undercooling effects. A mean-field model is derived by homogenization of the free boundary problem. It extends the classical theory of Lifshitz et al. by taking into ac…
[structure:see text] Anionic facial amphiphiles have been prepared from cholic acid. These compounds offer antipodes of recently reported cationic amphiphiles derived from cholic acid. The synthesis of the anionic amphiphiles was accomplished in few steps from a common intermediate. In contrast to many other anionic f…
The Monte Carlo simulation of probability of radiation damage from incorporated Auger emitters to DNA and the mechanism of possible damage formation (single strand breaks (ssb) and double strand breaks (dsb) of DNA) in relation to track structures of the Auger electrons is reported. Three different models were used of…
Electrochemical investigations on Fe-Si alloys with different Si content (1.9 at% to 50.0 at%) were carried out in nitrogen-purged acidic (pH = 5.0) and weakly alkaline (pH = 8.4) solutions. The passivation behavior of these alloys is dependent on the Si content, which leads to three different phases of the bulk metal…
Abstract Homoionic Ca-saturated clay pastes were prepared and drying curves were obtained by applying suction pressures from 1 kPa to 100 MPa, A transmission device was used to study particle orientation by placing the clay in a cell specially designed to obtain diagrams corresponding to different sample orientations.…
Abstract In situ high temperature single crystal X-ray diffraction (XRD) experiments have been performed on a chemically quasi-ideal omphacite sample up to 1000°C. The lattice parameters were studied as a function of temperature, and their thermal expansion coefficients determined. The b and c cell edges show disconti…
The synthesis and characterization of a zinc meso-tetra(4-pyridyl)porphyrin containing four coordinated μ 3 -oxo-triruthenium acetate cluster complexes, ZnTCP , are reported. The coordination of four ruthenium acetate clusters to the zinc porphyrin has been confirmed by 1 H and 13 C NMR spectroscopy, including COSY an…
Porous titania gel monoliths with pure anatase, rutile, and their coexistent phases are prepared by the sol−gel method and subsequent heat treatment, respectively. Their apparent surface nanoscale topography and average roughness are studied using atomic force microscopy (AFM). The AFM images show that the porous tita…
Nanocrystalline gold films were made by advanced gas deposition. The mean crystallite diameter lay between ∼10 and ∼80 nm depending on substrate temperature during deposition and annealing post-treatment, as found by x-ray diffractometry and transmission electron microscopy. Temperature dependent resistivity ρ was mea…
The family of commercially produced high-strength, high-modulus fibres and yarns for the manufacture of technical textiles and construction composites, based on aromatic para-polyamides – poly-para-phenylene-terephphtalamide (Kevlar, Twaron), copolymers (Terlon, Technora), poly-para-heteroarylenes (SVM, Armos), was di…
We observed a new kind of supramolecule formed by molecular nanotubes and starpolymers on a highly oriented pyrolytic graphite (HOPG) by scanning tunneling microscopy. The molecular nanotube is an organic tubular molecule with the length of ca. 25 nm, synthesized from α-cyclodextrins. It was found that the molecular n…
Pb(Zr X Ti 1- X )O 3 (PZT) thin films on Pt/SiO 2 /Si substrates formed by pulsed laser deposition (PLD) and subsequent rapid thermal annealing (RTA) have been investigated. X-ray diffraction (XRD) and atomic force microscopy showed that the crystalline structure and the crystallographic orientation of PZT films after…
Abstract Ethylene copolymer resin (ECR) modifiers play an important role in low‐smoke PVC. As high‐molecular‐weight flexibilizers, these resins reduce smoke and add strength and low temperature flexibility. This combination allows compounders to increase the amounts of flame‐retardant additives without compromising st…
Abstract Poly(L-lactic acid) (PLLA) is quite promising for use as biodegradable and non-petroleum derived plastics. In this study we developed an innovative two-step polycondensation process so as to produce economically PLLA with high molecular weight. The process is composed of both melt polycondensation under the l…
The cyclic voltammetric behavior of selected Keggin- and Dawson-type heteropolyanions has been studied as a function of electrolyte composition. The buffer capacity of the electrolyte is shown to be an important parameter that can be used to reveal the symmetry or dissymetry in charge distribution within each oxometal…