Materials Literature
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Magnetic and neutron-diffraction methods have been used to study the magnetic state of polycrystalline and amorphous samples of the intermetallic compound Ce 2 Fe 17 . The amorphous state was obtained by irradiating the intermetallic compound by fast neutrons. It has been shown that the competition of ferromagnetic an…
A PVC nanocomposite has been obtained by exploiting the exfoliation of Na–bentonite in water and the fact that vinyl chloride is usually polymerised as a water suspension or emulsion. An exfoliated clay aqueous dispersion is prepared and blended with PVC latex before the latter is dried, leading to intimate mixing and…
A novel method using the layer by layer (LBL) technique was investigated to deposit polyelectrolytes with antibacterial properties. A glass substrate was coated by a cationic biguanide followed by the anionic polystyrene sulfonate until a total of twenty layers were deposited. The layers thickness was measured by elli…
Abstract In the textile industry a tool is needed that can predict fibre and yarn movement in turbulent air streams. The Institut für Textiltechnik of RWTH Aachen University (ITA) has developed a yarn model that can be used to study the movement of single fibres and yarns in turbulent air flows. The kinematic model is…
Surface modification treatments have been utilized in the physical and chemical modifications of the fiber surfaces since long time. Fiber properties have been improved thanks to different modification techniques, and their utilizables have been increased in a lot of areas. In this paper, the surface modification trea…
The system Li2O-WO3-B2O3 were prepared with equal molar ratios of both Li2O and WO3 by the usual rapid quenching technique. From the analysis of X-ray diffraction data (using a Mo-source of wavelength λ = 0.709 Å), it was found that for 0.0 ≤ x ≤ 0.25 the systems formed are crystalline, while for x ≥ 0.30, glassy form…
The manganese oxide material K-OMS-2 was synthesized both via a redox reaction between potassium permanganate and manganese nitrate in an acidic medium (nitric acid) under reflux conditions and by the sol–gel reaction between KMnO 4 and maleic acid employed in a 3:1 molar ratio. Cerium(IV) was then added by an ion-exc…
Abstract The effect of processing variables (filler loadings) and operating variables (frequency) on the impedance and electromagnetic interference shielding effectiveness of vapor grown carbon nanofiber (VGCNF) reinforced chlorobutyl vulcanizates has been investigated. The dispersion and morphology of the VGCNF in th…
Abstract The Co—Ni distribution in d -Al 69.7(4) Co 10.0(4) Ni 20.3(4) was investigated based on X-ray and neutron diffraction data. The structure was modelled in higher dimensional space using the ‘charge-flipping’ and ‘low-density elimination’ methods and it was quantitatively refined in three-dimensional space empl…
It is essential to determine the relationship between soil chemical and mineralogical properties and soil response to acid load to understand the acid-neutralizing capacity and cation behavior of different ecosystems. For 46 soil samples from a subsurface horizon in humid Asia, that is, Japan, Thailand and Indonesia,…
The distribution of alloying atoms over the sites of the ordered crystal lattices of the γ′ phase and the Ni 2 Cr superstructure that form during aging of the EK78 superalloy is determined by neutron diffraction, and their long-range order parameters are measured. The size, shape, and orientation of the forming γ′-pha…
Aluminum Nitride (AlN) ceramics are used as wafer heating plates and wafer holding electrostatic chucks in semiconductor fabrication equipments. For tailoring the electrical resistivity to satisfy the requirements of each component, several kinds of approaches were investigated for hot-pressed AlN ceramics. Three tech…
The distribution of sulfur atoms embedded in single crystals of zeolite Na X is investigated using the single-crystal X-ray diffraction analysis. It is shown that, in the unit cell of the Na X (S) zeolite, 67 sulfur atoms are located in the form of S 8 or S 6 rings and S 2 molecules in large cavities and in the form o…
Abstract The aim of this study was to investigate the effect of chain extender and diisocyanate amount on the thermal, mechanical and wettability properties of some polyurethanes. The chain extender nature caused the increase of the thermal stability due to the higher stability of the double and triple bonds respectiv…
Corap, farkli renk ve desenleri ile bir aksesuar malzemesi olmanin yaninda, insanlarin temel ihtiyac malzemelerinden birisi olup, saglik acisindan da oldukca onemli bir giysidir. Coraplarin kullanim performansi acisindan isil konfor en onemli parametredir. Bu calismada piyasada siklikla karsimiza cikan yun, akrilik ve…
In the preceding paper hydro generator constructional features and causes of core losses were presented. This second paper will further cover the definition of stator core losses (open circuit and short circuit) and the way they are segregated for stator core loss calculations. Stator core insulation degradation mecha…
The sp 2 bonding concentrations of nitrogen-doped amorphous carbon samples and nanodiamond films were determined from their soft X-ray absorption spectra. The amorphous carbon (a-C) samples were deposited under atmospheres of varying nitrogen concentrations onto polytetrafluoroethylene (PTFE) polymer and silicon subst…
The insulation lifetime of XLPE power cables is determined by several factors. One of the most important of these is the occurrences of partial discharge (PD) in the dielectric. The ability to detect and locate the PD sources is limited by attenuation and distortion of the high frequency PD pulses as they propagate th…
The morphological and structural characteristics of multiwalled carbon nanotubes subjected to multi shock-wave compression to pressures of about 120 GPa and temperatures of 2000 K are comprehensively analyzed experimentally and theoretically. The calculations relevant to the thermal history of shock compression follow…
Abstract Nanocomposites of poly(4-methyl-1-pentene) (PMP) with various weight fractions of multiwall carbon nanotubes (MWNT’s) were prepared by melt compounding. The nanocomposites are characterized for structure using scanning electron microscopy. The viscoelastic behavior of the nanocomposites is investigated in sol…