Materials Literature
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The objective of the present study is to improve the modelling of heat transfer by elementary cells, aiming to increase the quality of their representation in the Laplace space. From the twoport representation and its connections with the classical nodal method, we show that the systematic increase of the order leads…
Es ist schon lange bekannt, dass man Polyamid-6 (PA-6) mit Hilfe von Phosphorsäure zu seinem Monomeren, dem Caprolactam, abbauen und damit einem rohstofflichen Recycling zuführen kann. Allerdings kann dieses Verfahren, das auch in der industriellen Praxis — vor allem für Faserabfälle aus Polyamid-6 — eingesetzt wird,…
New homologous series of N-[4-(4-n-alkoxybenzoyloxy)-2-hydroxybenzylidene]hydroxyanilines were synthesized. All 4-hydroxyaniline derivatives exhibited a nematic phase, while 3-hydroxyaniline and 2-hydroxyaniline derivatives exhibited only a nematic phase as the terminal alkoxy group was lengthened. Infrared spectra su…
Temperature-dependent polarized infrared spectra were measured over the temperature range 105-30°C for a ferroelectric liquid crystal with a naphthalene ring (FLC-1) in the isotropic, smectic A (SmA), and chiral smectic C (SmC*) phases to investigate its molecular conformation, interactions, and alignment in each phas…
The secondary electron emission coefficient (γ) of vacuum-annealed MgO films has been investigated using a γ-focused ion beam (γ-FIB) system. The vacuum-annealed MgO films have been found to have higher γ values from 0.05 to 0.12 than those from 0.03 to 0.06 for as-deposited MgO films for operating Ne + ions whose acc…
The films formed on Cu surfaces in 4% NaCl with 10 ppm FeSO4 solution for short immersion times of up to 4 h were analysed using X-ray photoelectron spectroscopy and Auger electron spectroscopy. Iron was detected on the copper surface after immersion for 30 min. The presence of Fe(OH)2 and α-FeOOH species on the surfa…
Polarized optical reflectivity is studied in single crystals of ${\mathrm{BaCo}}_{1\ensuremath{-}x}{\mathrm{Ni}}_{x}{\mathrm{S}}_{2}$ over a wide compositional range $0<~x<~0.28$ from the antiferromagnetic insulating to the paramagnetic metallic phase. ${\mathrm{BaCoS}}_{2}$ is a charge-transfer-type Mott insula…
The effects of aging temperature and time on the oxygen storage capacity (OSC) of Pt-Rh-promoted Ce0.75Zr0.25O2 solid solutions were measured and correlated with the BET surface area and noble metal (NM) surface area in the catalysts. The NM surface area is better correlated with OSC than is with the BET surface area.…
Temporal change of absorption spectra in PbI2 ultra-thin microcrystallites (UTMs) have been studied by a pump–probe method with a sub-picosecond pulse laser. In the differential absorption spectra we have found saturation, blue shift and broadening of exciton absorption bands. The lifetime of the free exciton tends to…
A series of transition metal (Ni, Cu, Pd) complexes derived from macrocyclic tetrabenzo[b,f,j,n] [1,5,9,13]tetraazacyclohexadecine (TAAB) was synthesized and their mesomorphic properties studied by differential scanning calorimetry, polarized optical microscopy and X-ray powder diffraction (XRD). These compounds have…
Abstract The solubility of a commercial aryl phosphite processing stabilizer for ployolefins, {tris (2,4‐di‐t‐butylphenyl)} (irgafos 168, Ciba Speciality Chemicals), has been measured in polypropylene over a range of temperatures. Measurements are complicated by hydrolsis of the phosphite, releasing 2,4‐di‐t‐butylphen…
The processes of phonon transport in ceramics and composites based on aluminum and zirconium oxides are studied experimentally in the region of helium temperatures. It is demonstrated that, for the ceramic grain size R within two orders of magnitude and more (up to nanosizes), the phonon diffusion coefficient D eff ∝…
The biodegradability of five different biodegradable garbage bags were analyzed according to the DIN-Standard draft 54'900 “Measurement of the compostability of polymers”. The tests have to prove that a “biodegradable polymer” can be degraded under controlled composting conditions. Five different types of bags were te…
Abstract Based on a simplified Monte Carlo simulation model of electron scattering and characteristic x‐ray excitation of a multicomponent film on a substrate, a calculation method with an iteration approach was developed to transform the x‐ray intensity ratios measured by an electron probe microanalyzer into the chem…
Longitudinal and transverse magnetostrictions of polycrystalline samples of intermetallic compounds RMn 2 Ge 2 (R=Sm or Gd) are measured in pulsed magnetic fields up to 250 kOe. It is found that linear magnetostrictive strains of about 10 −3 arise in a temperature range in which the magnetic field causes a change in t…
The iodine K-edge EXAFS study of KIO3 was performed to clarify local structural changes on the successive phase transitions. The pair-distribution function of three oxygen atoms in an oxygen octahedron is almost independent on temperature like a covalent bond, whereas that of the other three is gradually reduced with…
This paper describes the effect of alkyl and alkoxy chain lengths on the thermal properties of four isomeric systems; 4-R-phenyl 4-(4-octyloxybenzoyloxy)benzoates ( 1 ), 4-octyloxyphenyl 4-(4-R-benzoyloxy)benzoates ( 2 ), 4-(4-R-benzoyloxy)phenyl 4-octyloxybenzoates ( 3 ), and 4-R-phenyl 4-octyloxyphenyl terephthalate…
Self-trapped holes (STH), self-trapped excitons (STE) and shallow electron centres in small AgCl crystals embedded in a KCl crystalline matrix have been observed by means of optically detected magnetic resonance (ODMR). The existence of the impurity clusters in heavily doped KCl:AgCl single crystals, ranging from sing…
A high-performance phase change optical recording disk, which has a five-layered structure, was proposed. This disk has a ZnS adhesion layer between a GeSbTe recording layer and a ZnS–SiO 2 second dielectric layer. A 2×10 5 overwrite cyclability was achieved with the original five-layered phase change optical recordin…
Size-dependent excitonic photoluminescence (PL) of CuBr nanocrystals is studied using both, resonant and band-to-band excitation. Narrow excitonic emission lines observed in big nanocrystals (mean radius >5 nm) transform into two wide emission bands in smaller nanocrystals. These two bands are not significantly narrow…