Materials Literature
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Mesoporous [Al]MCM-41 material ( n Si / n Al = 15) has been modified by an aqueous solution of ammonium fluoride and characterized by XRD, N 2 adsorption, 1 H, 19 F, 27 Al, and 29 Si NMR spectroscopies and tested in the conversion of 2-propanol. By 1 H{ 27 Al} TRAPDOR MAS NMR it is shown that a significant number of S…
The electronic structure of SrCu2O2, a wide gap (∼3.3 eV) p-type oxide semiconductor, was examined by photoelectron and optical spectroscopy. The spectroscopy results were compared with the energy band structure calculated by the local density approximation method to clarify the origins of p-type conductivity in this…
The pump power dependence of the relaxation dynamics of CdSe nanoparticles (NPs) was studied with femtosecond pump probe spectroscopy at observation wavelengths of the first exciton transition at 560 nm, the near infrared (NIR) absorption at 2 μm, and the transient mid-infrared (IR) absorption at 4.5 μm. Excitation wi…
The dynamic fragilities of six polymeric materials have been compared for isobaric (constant pressure) and isochoric (constant volume) conditions. Data were taken from the published literature for dynamic experiments performed at elevated pressures. Published pressure–volume–temperature (PVT) data were then used to de…
The synthesis and purification of a water-soluble host compound that contains three pyridinium units and one spacer-connected benzocrown ether unit in the meso-positions of porphyrin and of its Zn(II) or Cu(II) complexes is described. Metalation leads to small (compared to the apo-derivative) changes of selectivities…
Small-angle scattering is widely used for measuring materials microstructure in the 1–100 nm size range. Ultrasmall-angle x-ray scattering (USAXS), typically achieved through crystal collimation, extends this size range to include features over 1 μm in size. This article reports on USAXS on the UNICAT beam line 33-ID…
New 1D complexes are obtained from the reaction of 1,1′-biphenyl-2,2′-dicarboxylic acid (diphenic acid) with KOH and [Co(NO3)2·6H2O] or [Ni(NO3)2·6H2O] under hydrothermal conditions. Compounds 1 and 2 are isostructural and their structure consists of stacked helical chains of octahedral metal(II) ions. Magnetic measur…
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…