Materials Literature
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The crystal transformation in lamellar crystals of polybutene-1 grown from an amyl acetate solution was studied by cryogenic high-resolution transmission electron microscopy. The shape of the transformed trigonal (form-1) crystal domains in the surrounding tetragonal (form-2) crystal was successfully revealed. Along w…
The photodegradation of a variety of donor–acceptor-substituted azobenzene nonlinear optical chromophores has been studied. The variables examined that influence the rate of degradation include chromophore and host polymer structure, irradiation wavelength, temperature, and atmosphere.
Segmented polyurethanes based on diphenylmethane-4,4′-diisocyanate and polytetra-methylene glycol were synthesized using a mixture of polyhedral oligomeric silsesquioxane (POSS)-diol and 1,4-butanediol as chain extenders. The polymers were characterized by differential scanning calorimetry, wide-angle x-ray diffractio…
In this article we report on the thermal properties of the ternary carbide Nb2SnC. Its heat capacity, cp, is 75 J/mol K at ambient temperatures and increases to ≈115 J/mol K at 1300 K. Analysis of cp measurements in the 4–15 K temperature range yields a Debye temperature of 324 K and a density of states at the Fermi l…
The results of electrical and dielectric studies in semicrystalline nylon 11 (degree of crystallinity 62%) by means of dielectric relaxation spectroscopy (DRS) in the frequency range 10−2–106 Hz at temperatures between the glass transition temperature of about 40 °C and the melting temperature of about 190 °C are repo…
Kinetics of the polymerisation of ε-caprolactone and L,L-dilactide initiated with tin(II) 2-ethylhexanoate (tin octoate (Sn(Oct)2)) and carried out in the presence of 2,6-di-tert-butylpyridine (1) and/or 1,8-bis(dimethylamino)naphthalene (2), in THF as the solvent, at 80°C was studied. The rate of polymerisation of th…
The thermally induced amorphous-to-crystalline transition has been studied for bulk sheets and micrometre-sized particles of magnesium silicate glass (MgSiO3), nanometresized amorphous magnesium silicate (MgSiO3 and Mg2SiO4 smokes) and amorphous silica particles (SiO2). Silicate glass was produced by the shock-quenchi…
High-resolution and magnetic neutron-diffraction measurements were performed to investigate the crystal and magnetic structures of bilayered FeOCl and polyaniline-intercalated FeOCl. A quasi-two-dimensional crystallographic structure, where charge neutral $({\mathrm{Fe}}_{2}{\mathrm{O}}_{2}{\mathrm{Cl}}_{2}{)}_{n}$ la…
Abstract The aim of this work is to understand the influence of type of (short) carbon fibers, processing conditions and fiber incorporation level on the rheological behavior of carbon fiber/polypropylene (PP) composites. For this purpose, two types of fibers (sub‐micron Vapor Grown Carbon Fibers, VGCF, and ex‐PAN, PA…
Texture development in alumina that contains calcia and silica and has been templated with platelet‐shaped α‐Al 2 O 3 particles has been evaluated. The texture fraction is shown to be related directly to template growth. Texture quality is controlled by the template concentration, decreasing at template concentrations…
Concomitant chemotherapy and radiotherapy (CCRT) has recently been shown to improve treatment outcome in a range of solid tumors. Pegylated liposomes have the potential to target drugs directly to tumors and may increase the efficacy and reduce the toxicity of CCRT by selectively delivering radiosensitizing agents to…
We study aperiodic systems based on substitution rules by means of a transfer-matrix approach. In addition to the well-known trace map, we investigate the so-called ``antitrace'' map, which is the corresponding map for the difference of the off-diagonal elements of the $2\ifmmode\times\else\texttimes\fi{}2$ transfer m…
The formation of corrosion products was followed during the atmospheric corrosion of open and confined zinc surfaces exposed to periodic wet and dry conditions. The periodic wet and dry exposure consisted of the immersion of samples in sodium chloride (NaCl) solutions followed by exposure to laboratory air for differe…
The construction of 32 scaffolds at the periphery of a fifth generation poly(propyleneimine) dendrimer, in which glycinylurea-modified molecules can be selectively bound, represents a novel approach to functionalize dendrimers (see schematic representation). These supramolecular architectures have enhanced rigidity an…
Effects of the electron doping on the magnetic and electronic properties have been investigated in the conducting double perovskite ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}.$ Judging from the enhanced moment ${\ensuremath{\mu}}_{\mathrm{Mo}}$ at the Mo site, the doped electrons are considered to occupy mainly the down-s…
Photoelectrochemistry (PEC), glancing angle x-ray diffraction (GAXRD), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP) in synthetic salt water were utilized to investigate the nature of different oxides formed on titanium by thermal oxidizing, polishing, acid-etching, and anodizing…
We demonstrate that ultrafast pump–probe reflectivity measurements from bulk Si samples using a Ti:sapphire femtosecond oscillator (λ=800 nm) can be used to measure the Si surface recombination velocity. The technique is sensitive to recombination velocities greater than ∼104 cm s−1.
The characterization of Si‐B‐C‐N amorphous ceramics using isothermal compression creep testing in the temperature range of 1200°–1500°C is reported. The deformation rate contains a stress‐dependent component that is proportional to the applied stress, which indicates that this portion of the deformation mechanism is b…
The time evolution of changes in the optical absorption coefficient with illumination has been studied for $a{\ensuremath{-}\mathrm{A}\mathrm{s}}_{2}{\mathrm{S}}_{3}$ films at 50, 100, 200, and 300 K in order to characterize the dynamics of photodarkening. The magnitude of the changes is larger at the lower temperatur…
Synopsis A new method for the in vivo characterization of the physical properties of skin is presented. This comprises an ultrasound device to measure the vertical displacement of the surface of the skin, as well as its thickness and that of the hypodermis under suction. In combination with this, a mathematical model…