Materials Literature
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Elaborate transcription of unimolecular stacks or helically bundled fibers of sugar-appended porphyrin gelators into silica by sol–gel polycondensation of tetraethoxysilane gives unique hollow silica fibers with a monodispersed 4-nm inner diameter (left picture) and huge helical silica bundles (right picture), respect…
Polypyrrole films were investigated by using ac-electrogravimetry, that is, simultaneous impedance and electrogravimetry spectroscopies at various potentials between the reduced and oxidized forms in NaCl solutions. Information about the movement of anions, cations, and solvent during the switching of polypyrrole betw…
A heterogeneous version of the Sharpless epoxidation: a chiral tartaric acid derivative is grafted onto the surface of silica and in the mesopores of MCM-41 (see picture). The hybrid chiral catalyst is as effective as the homogeneous complex in terms of turnover number and enantioselectivity, and the product is easily…
Bridging coordination of Mo2P2 complexes between metal centers is a prerequisite for the formation of a one-dimensional polymer. The choice of counterion also has a deciding role in determining the polymer structure: while the complex [Cp2Mo2(CO)4(μ,η2-P2)] (1; Cp=C5H5) with AgNO3 forms a zigzag polymer chain, with Cu…
A new starch-based polymeric system, ZI1OU from Novamont, mainly composed of starch and polycaprolactone, was reprocessed several times in an extruder to investigate the recyclability of this biodegradable polymer. A previous investigation of the thermomechanical degradation in a mixer has been also done. The degradat…
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,…