Materials Literature
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Reaction of a solution of the multi-iron polyoxometalate (POM) K 9 [(Fe III (OH 2 ) 2 ) 3 (A-α-PW 9 O 34 ) 2 ] (K 9 1 ) with a colloidal suspension of cationic silica nanoparticles ((Si/AlO 2 )Cl) results in the production of a new heterogeneous oxidation catalyst (K 8 1 /(Si/AlO 2 )). Dynamic light scattering data, c…
In the weld zone and base metal contiguous to the weld zone in flash-butt welded rail, the web of the rail has high tensile residual stresses and the head and base of the rail have compressive residual stresses. The web region is susceptible to failure since most of the weld zone of the rail is coarse grained and has…
Surface-modified hollow-fiber membranes were prepared by radiation-induced grafting of an epoxy-group-containing monomer, glycidylmethacrylate (GMA), onto a polyethylene-based fiber (PE-fiber). The epoxy ring of GMA was opened by introduction of diethylamine (DEA). The bacterial adhesivity to this material (DEA-fiber)…
Abstract The synthesis and full characterization of new chromophores with second order optical nonlinearities containing the 2‐phenyl‐(5,6)‐nitrobenzimidazole group is reported. Starting from 2‐{4‐[(4‐ N , N ‐dihydroxyethylamino)phenylazo]phenyl}‐5(6)‐nitrobenzimidazole, a combined theoretical and experimental approac…
The effect of heat treatment on illite in air at temperatures ranging from 750 to 1150 °C was studied using the Mössbauer effect in 57Fe. The dependence of the Mössbauer parameters and relative percentage of the radiation absorption area was measured as a function of the firing temperature. The onset of thermal struct…
Abstract Polyolefin‐organoclay nanocomposites containing a synthetic tetrasilisic fluoromica were prepared from metallocene‐catalyzed and conventional Ziegler‐Natta‐catalyzed linear low‐density polyethylenes (LLDPE) by means of melt‐compounding. The effects of maleic‐anhydride grafted compatibilizer (PE‐g‐MA) level, c…
Abstract Summary: For the first time, a series of Gd(AA) 3 /NR (natural rubber) composites for X‐ray shielding were prepared by an in situ reaction method. Occurrence of the in situ polymerization of Gd(AA) 3 in composites during vulcanization of NR with peroxide greatly improves the dispersion level of the shielding…
Abstract The products and mechanism of the thermal oxidative degradation of poly(ethylene oxide) at 150 °C have been analysed using 1 H and 13 C 1‐D and 2‐D NMR spectroscopy, including COSY, HMQC, HMBC and DOSY techniques. Peaks from methanoate ester chain ends (in the majority), in‐chain esters, peroxy groups, acetal…
Abstract The EPR parameters anisotropic g ‐factors g x , g y and g z for Cu 2+ ion and hyperfine structure constants A x , A y and A z for 63 Cu 2+ and 65 Cu 2+ isotopes in rutile (TiO 2 ) crystal are calculated by the method of diagonalizing the full Hamiltonian matrix. The crystal‐field parameters contact with the c…
Abstract Because of their superior mechanical and thermal properties, light weight, and favorable cost/performance ratio, nanocomposite materials appear to be suitable replacements for metals and alloys in many industrial applications in fields such as automotive, structural plastics, electronics, packaging, and so on…
Author: Taeri, S. et al.; Genre: Journal Article; Issued: 2004; Keywords: MPI für Metallforschung; Abt. Rühle; ; Title: Deformation behaviour of strontium titanate between room temperature and 1800 K under ambient pressure
In the present work a process of catalytic wet air oxidation of lignin obtained from sugar-cane bagasse is developed with the objective of producing vanillin, syringaldehyde and p-hydroxybenzaldehyde in a continuous regime. Palladium supported on g-alumina was used as the catalyst. The reactions in the lignin degradat…
Irradiation assisted stress corrosion cracking (IASCC) of cold-worked 316 stainless steels irradiated to doses up to 53 dpa was examined using slow strain rate tensile tests in 593 K simulated pressurized water reactor primary water while changing the content of dissolved hydrogen (DH) and dissolved oxygen (DO). A hig…
Several polycarboxylic acids have been studied as durable press finishing agents for cotton fabrics. The most effective is 1,2,3,4-butanetetracarboxylic acid (BTCA). One of the drawbacks of this crosslinking is the severe loss of mechanical strength of the treated fabrics, which is responsible for the reduced durabili…
ABSTRACT: To assess the ability of whey protein films to act as antimicrobial carriers, the effect of film composition on preservative diffusion was investigated. Preservative diffusion coefficients were measured at 24°C in whey protein isolate (WPI) films with different WPI‐glycerol plasticizer ratios (1:1 to 15:1),…
A novel thermally stable and low dielectric poly(binaphthylene ether) ( 2 ) has been developed. Polymer 2 was easily prepared by oxidative coupling polymerization of 2,2‘-bis(1-naphthyloxy)-1,1‘-binaphthyl ( 1 ) with FeCl 3 as an oxidant. This polymerization produced regiocontrolled polymer 2 with a number-average mol…
Silicone rubber samples, filled with 30% alumina trihydrate, subjected to the ASTM inclined plane test, show good correlation between the measured harmonic power components of dry band arcing and the surface temperature recorded with a thermovision camera. The simultaneous study of the low frequency fast Fourier trans…
The wet etching of Pb(Zr,Ti)O 3 (PZT) thin films has gained considerable attention in microelectromechanical systems (MEMS) since it is economical and effective compared with dry-etching methods. In this paper, a novel wet-etching process is proposed for PZT thin film patterning using 1BHF:2HCl:4NH 4 Cl:4H 2 O solutio…
A set of lysimeter based experiments was carried out during 2000/01 to evaluate the impact of soil type and grassland management on potassium (K) leaching. The effects of (1) four soil textures (sand, loam, loam over chalk and clay), (2) grazing and cutting (with farmyard manure application), and (3) K applied as inor…
Abstract Biodegradable composites based on cellulose derivatives/starch blends reinforced with sisal short fibers were fabricated by injection molding. Results of short‐term flexural creep tests are reported to investigate the time‐dependence behavior of the composites. Fiber content and temperature effects are also c…