Materials Literature
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Abstract Advanced composite manufacturing processes demand the use of fully fashioned near-net shape preforms. Flat knitting technology is especially suited for the production of such products. Research work which has been carried out at the ITB proved the possibility to obtain biaxial reinforced multilayer weft knitt…
Abstract Magnesium methacrylate (MDMA) was in situ prepared in nitrile rubber (NBR) by reacting magnesium hydroxide (Mg (OH) 2 ) with methacrylic acid (MAA) during the mixing step. The formation of MDMA in NBR was proved by the wide‐angle X‐ray diffraction analysis (WAXD). The mechanical properties, crosslinking struc…
The surface chemistry and structure of nanosized silicon, as obtained by high-energy ball milling and its subsequent dispersion in ethanol, via sonication-assisted oxidation, is presently described. These Si/SiO x suspensions that spontaneously assemble on glass surfaces were investigated as a function of pH in a vari…
A new catalyst, which was made of MnO2 impregnated with Pd for decomposition of high humidity ozone gas, was developed and its catalytic activity decrease was analyzed in a finite difference type fixed bed reactor. The activity of the catalyst was higher than that of other catalysts and an activated carbon and does no…
The development of optimized electrodes for planar anode-supported solid oxide fuel cells (SOFCs) is of great technical interest. The main function of the SOFC anode is to provide the reaction sites for the electrochemical oxidation of the fuel gas. Thus, the anode material must be stable in the reducing environment a…
The local structures of ${\mathrm{Nd}}^{3+}$ and ${\mathrm{Er}}^{3+}$ ions in two series of rare-earth (RE) phosphate glasses with nominal compositions ${\mathrm{xR}}_{2}{\mathrm{O}}_{3}\ensuremath{-}(1\ensuremath{-}x){\mathrm{P}}_{2}{\mathrm{O}}_{5},$ where $R=\mathrm{Nd}$ and Er and $0.05<~x<~0.28,$ have been…
Thermochemically devulcanised ground tyre rubber (GTRDL) was added to fresh rubber compositions, which were then melt blended with low density polyethylene (LDPE). Styrene/butadiene rubber (SBR), natural (NR), and ethylene/propylene/diene (EPDM) rubbers were selected as the fresh rubbers. During blending, dynamic curi…
Silver colloids stabilized by a specially designated molecule, 2-mercaptobenzimidazole (MBMZ), were prepared in a 50:50 (v/v) aqueous ethanol solution. A number of wire-like configurations impregnated with Ag nanoparticles were identified in the TEM images as the concentration of MBMZ passed beyond a certain value. Mo…
Pseudomonas oleovorans NRRL B-778 accumulated mixtures of poly-3-hydroxybutyrate (PHB) and medium-chain-length poly(hydroxyalkanoates) (mcl-PHAs) when grown on glucose, octanoic acid or oleic acid, whereas growth on nonanoic acid or undecanoic acid resulted in copolymers of poly-3-hydroxybutyrate-co-3-hydroxyvalerate…
An unusual vertex-shared double-cubane [{Cu3(μ3-Cl)(μ3-OH)3}2Cu]6+ core surrounded by a belt of hydrogen-bonded chloride ions is present in the title compound. Magnetic data show an S=1/2 ground state, which implies there is substantial spin-frustration within the heptacopper aggregate.
Abstract Recent improvements in imaging photoelectron spectroscopy enhance lateral and vertical characterization of heterogeneous samples at the cost of increasing complexity in the XPS data sets acquired. These imaging data sets require more sophisticated analysis methods than visual inspection if the data are to be…
Transient absorption spectra of the layered compound K 4 Nb 6 O 17, which is known as a photocatalyst for splitting water into H 2 and O 2, were measured by the femtosecond UV pump and visible probe technique. Under band-gap excitation of a K 4 Nb 6 O 17 single crystal and a spin-coated K 4 Nb 6 O 17 film, a broad tra…
The present study explored the application of a 20-kHz ultrasound unit for the disinfection of domestic wastewater. Experiments were conducted in batch with an ultrasound probe. The disinfection efficiency of fecal coliform increased with ultrasound power input from 0.003 log kill/min at 70 W/L to 1.8 log kill/min at…
Abstract The sorption and diffusion of four esters into polypropylene packaging films immersed in four different solutions have been studied by the FTIR method at 45°C. Kinetic curves have been generated for these systems to compute diffusion coefficients. The calculated results are discussed in terms of size and shap…
Abstract In XPS, it is often observed that the x‐ray flux causes changes in the surface structure and chemistry in the surface region of organic materials. However, at present, there is no standard guide to estimate the relationship between the degradation rate and x‐ray source flux. To investigate this relationship,…
To study the influence of a polymeric substrate, hydroxypropylcellulose (HPC), on the dynamics of the nematic mixture E7, the real (ε′) and imaginary (ε″) parts of the complex dielectric permittivity of the unaligned composite system (polymeric substrate covered with liquid crystal) were measured as a function of freq…
Technically and economically optimized insulation systems can only be offered today if there is complete knowledge of phenomena in the winding insulation that determine its service life. This paper describes how such mechanisms are influenced by operating conditions, how they are detected using modern diagnosis method…
Direct measurements of individual bubble oscillations in lithotripsy fields have been performed using light-scattering techniques. Studies were performed with bubble clouds in gassy water as well as single levitated bubbles in degassed water. There is direct evidence that the bubble survives the inertial collapse, reb…
Samples of PC/PET blends, prepared by reactive blending in the presence of different catalysts, were analyzed by 1H NMR and DSC, in order to evidence the effects of the transesterification reactions on the molecular structure and thermal properties. The 1H NMR analysis evidences the formation of copolymers whose degre…
The paper presents a comparative analysis of different theoretical iron losses evaluation techniques, coupling finite-element calculations and material modeling. This coupling can be performed at different levels: as a postprocessing step or inside the nonlinear solution loop. Comparisons on an induction machine struc…