Materials Literature
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It is well‐known that clean room textiles are acting as a barrier protecting humans against the surrounding atmosphere or vice versa. These textiles are produced in the limited range of porosity and the air permeability. The porosity calculated from fabric geometry and the air permeability of two typical clean room te…
The synthesis and transition temperatures of a series of 5-(4-alkyl- and 4-alkoxy-phenyl)2-cyanobenzo[b]furans and a 5-(4'-alkylbiphenyl-4-yl)-2-cyanobenzo[b]furan are presented. The 2-cyanobenzo[b]furans show similar mesophase types to the analogous biphenyl and terphenyl compounds, which are obtained by replacing th…
This paper treats the axisymmetric flo w driven by Marangoni convection and a Rotating Magnetic Field (RMF) in a Floating-Zone configuration. For a low Prandtl number liquid, and different Marangoni values, we investigate the evolution of the flo w as the intensity of the RMF is increased. It evolves from a Marangoni…
Research in materials today has progressed from materials exhibiting structural functionality to those exhibiting electronic functionality. The study of solid-state ionics ushers in a new era of chemically functional materials. This chemical functionality arises out of the defect equilibria of these materials, and res…
The crystal structures of fedorite from the type locality, the Turiy complex (Kola Peninsula, Russia) and the Little Murun complex (Sakha, Russia), have been refined from single crystals by CCD X-ray diffractometry. Both samples are triclinic, space group P¯1; fedorite from Turiy has a 9.6300(7), b 9.6392(7), c 12.611…
A variant of the maximum entropy method (MEM), recently developed by Vartiainen et al., is proposed for infrared reflectivity spectra analysis. The procedure uses a new interpolation algorithm to estimate the so-called error phase that is the key step of the model. As shown by several examples, this approach is a good…
Durch Umsetzungen von elementarem Praseodym mit Selen und Selendioxid (SeO2) als Sauerstoffquelle in geeigneten stöchiometrischen Verhältnissen lassen sich die Praseodym(III)-Oxidselenide Pr10OSe14, Pr2OSe2, Pr2O2Se und Pr4O4Se3 innerhalb von jeweils sieben Tagen bei 750 °C in evakuierten Quarzglasampullen reinphasig…
Summary To date, much emphasis on scale-inhibitor evaluation and the study of scale kinetics has been carried out using static beaker tests. This paper describes the use of an electrochemically based technique that allows the extent of scaling on a solid surface to be determined in the presence and in the absence of s…
A ferrocene-containing side-chain liquid-crystalline polymethacrylate was oxidized with iodine into the corresponding ferrocenium polymeric species. The reduced polymer showed enantiotropic smectic C and smectic A phases. The oxidized polymer exhibited an enantiotropic nematic phase. The results described in this repo…
The commercial grade of isotactic polypropylene (iPP) homopolymer (Mosten 58.412) was doped with different amount of β-nucleant (NJ Star NU-100). The fracture behavior of the β-iPP was examined on injection- and compression moulded specimens under dynamic load. The fracture toughness KId and JId, respectively, were us…
A series of nickel complexes of the didentate ligand 1,3-bis[di(o-methoxyphenyl)phosphanyl]propane (o-MeO-dppp) has been synthesized and characterized. The first low-spin nickel complex containing two coordinated water molecules, [Ni(o-MeO-dppp)(H2O)2](PF6)2 (1), and compounds of the general formula [Ni(o-MeO-dppp)X2]…
Different types of electron (hole) ground energy level renormalization due to confined (L) and interface (I) phonons in a spherical quantum dot embedded in a semiconductor medium are investigated on the example of β-HgS/CdS nanoheterosystem. It is shown that for all QD sizes the shift of the ground energy level (Δ) is…
We have studied the crystallization and melting of poly(n-octadecyl methacrylate) (PNODMA) by performing temperature and pressure jump experiments from the melt to the final semicrystalline state. The evolution of the crystallization process is studied in real time by recording the changes in the dielectric spectrum.…
X-ray scattering experiments have demonstrated that for thin films (100 Å to 500 Å) of La 0.9 Sr 0.1 MnO 3 epitaxially grown on SrTiO 3 (100) substrates, the accommodation of the lattice mismatch between film and substrate gives rise to a modulated structure. The non-bulk-like structural properties of these thin films…
The oxidation behaviour of a three-dimensional woven C/SiC composite protected with an SiC seal coating and with an SiC coating combined with an SiO2–B2O3 glassy coating have been respectively investigated through an experimental approach based on mass and flexural strength changes. Three main temperature domains exis…
Radiation hardness is one of the fundamental parameters characterizing a scintillator. The reason is that ionizing radiation often induces the formation of color centers in the irradiated material. These centers are related to lattice defects and may absorb light in the visible range. Possible overlap of the induced a…
The properties of materials derived from diphenolic acid (4-(bis(hydroxyphenyl))pentanoic acid, DPA), such as polycarbonate homo- and co-polymers (with bisphenol A, BPA), have been determined. The influence of copolymer composition on the thermal properties of these materials has been determined. Blends of polycarbona…
A modeling technique for rate-independent (quasistatic) scalar magnetic hysteresis is presented, using neural networks. Based on the theory of dynamic systems and the wiping-out and congruency properties of the classical scalar Preisach hysteresis model, the choice of a feed-forward neural network model is motivated.…
We have fabricated semiconductor-based magnetic superlattices (SLs) containing GaAs:MnAs granular material in which MnAs nanoclusters are embedded in GaAs, and have characterized their structural, optical, and magneto-optical properties. SLs consisting of GaAs:MnAs and AlAs are shown to have good crystalline quality a…
Monte Carlo simulations of amorphous polyethylene (PE) nanoparticle have been performed on the second nearest neighbor diamond lattice by including short and long-range interactions. A droplet can be either obtained from equilibrated PE bulk or from nanofiber snapshots by modifying periodic boundary conditions. The pr…