Materials Literature
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Monte Carlo computer simulations were used to investigate the interlayer structure of Ca-montmorillonite for hydration levels ranging from the dry clay to a three-layer system. Our model of montmorillonite consists of negative charge sites in both the octahedral and tetrahedral layers. Our results are compared with X-…
Abstract The effect of increasing the concentration of sorghum wax paste on the characteristics of soy protein isolate (SPI) films was investigated. Water vapor permeability (WVP), tensile strength (TS), elongation at break (E), and total soluble matter (TSM) of cast SPI films were determined. Sorghum wax paste extrac…
Die Synthesen zweier neuer Heteropolyanionen des M2X2W20-Typs mit Antimon als Heteroatom werden vorgestellt. Sie wurden durch vollständige Röntgenstrukturanalysen und spektroskopische Analysen charakterisiert. Die Verbindung Na6(NH4)4[Zn2(H2O)6(WO2)2(SbW9O33)2]·36H2O (1) kristallisiert monoklin (P21/n) mit a = 12, 873…
Abstract Scientists are more and more interested in biodegradable materials owing to their environmental advantage. We investigated viscoelastic properties of a newly developed biomaterial made from epoxidized soybean oil (ESO). ESO cross‐linked by triethylene glycol diamine exhibited viscoelastic solid properties. Th…
The aggregation behavior of meso-tetrakis(4-sulfonatophenyl)porphyrin, [ H 2 ( TPPS 4 )] 4- , in the presence of hydrated polyethyleneimine ( PEI ) in aqueous solutions (1.6 < pH < 7.6) has been investigated. The interaction leads to the formation of a variety of pH dependent species, which have been attributed…
Textiles are used in many industrial applications, especially in papermaking. During the pressing of paper, felts are used to recover the water expressed from the wet sheet. To improve this operation, felt structures have to be characterized. X-ray microtomography is a powerful tool for reconstructing the complex orga…
Abstract The adsorption of 13 C-labeled benzene on imogolite has been studied on samples which had been evacuated and then heated to remove water below their decomposition point. After adsorption of labeled benzene, the samples were studied by nuclear magnetic resonance using non-spinning techniques. The results show…
Abstract Two varieties of Zn-smectite were synthesized hydrothermally: sauconite, with an ideal composition of Na 0.4 Zn 3 (Si 3.6 Al 0.4 )O 10 (OH) 2 · n H 2 O; and a Zn equivalent of hectorite, with an ideal composition of Na 0.4 (Li 0.4 Zn 2.6 )Si 4 O 10 (OH) 2 · n H 2 O (referred to here as Zn-hectorite). For comp…
Three new members of the copper/carboxylato/heterocyclic diimine family, namely [Cu(GLYO)(2, 2′-bipy)]2 · nH2O (n = 4 (1) or 6 (2), H2GLYO = glycolic acid, 2, 2′-bipy = 2, 2′-bipyridine) and {[Cu(AcO)2(4, 4′-bipy)] · 3H2O}n (3) (AcO = acetato, 4, 4′-bipy = 4, 4-bipyridine), have been synthesized and characterized by I…
O trabalho trata da formação de solos arenosos hidromórficos com morfologia de Espodossolo, encontrados em extensas planícies, onde ocorrem áreas isoladas de Latossolos, em terrenos ondulados e bem drenados de colinas. O objetivo do estudo é elucidar a existência de relação pedogenética num sistema Latossolo-Espodosso…
Our previous modeling of hopping in localized bandtails has improved the description of electrical transport in amorphous carbon films and elemental amorphous semiconductors. This model is further developed to understand the role of the wavefunction localization radius γ—1 and density of states (DOS) distribution N(E)…
Abstract The isolation and identification of eighteen components from the leaves of Schefflera taiwaniana are presented. Their structures were determined on the basis of spectral data as well as direct comparison with authentic samples. These compounds include two polyacetylenes, one carotenoid‐like, three sesquiterpe…
We have incorporated nematic liquid crystal into periodic, polymer host structures templated from self-assembled colloids. Using these composite materials, we demonstrate the first electrically switchable three-dimensional Bragg diffraction. The switchable beam deflection is potentially useful for non-mechanical beam…
The initial rise method is one of the most reliable methods for evaluating the activation energy (E) of a single glow peak. However, this method gives erroneous values of activation energy in cases where the thermal quenching effect is present during the initial rise measurements. It is well established that the therm…
A lattice model for an electrolyte solution is proposed, which assumes that the hydrated ion occupies τ i ( i = 1, 2) sites on a water lattice. A lattice site is available to an ion “ i ” only if it is “free” (it is occupied by a water molecule, which does not hydrate an ion) and has also at least (τ i − 1) first-neig…
A Lagrangian finite element algorithm is described for solving two‐dimensional, time‐dependent free surface fluid flows such as those that occur in industrial printing processes. The algorithm is applied using a problem specific structured meshing strategy, implemented with periodic remeshing to control element distor…
We report on the absorption coefficient at 355 nm laser wavelength for 4H- and 6H-SiC over a wide temperature range. The measurements were carried out using a depth- and time-resolved free-carrier-absorption technique. The values of the absorption coefficient for the fundamental E ⊥ ĉ and E ‖ ĉ light polarization were…
The contribution presented here is the development of the system for qualitative prediction of garment appearance quality. The starting point for designing such a system is a qualitative evaluation of garment appearance quality, based on the study of relation of fabric mechanical properties and achieved quality level…
Molecular simulations and in situ atomic force microscopy (AFM) experiments are used to demonstrate the influence of the ionic strength of the solution and the mechanism of growth inhibitors on growth and dissolution of barite with some comparative experiments on celestite. Growth and dissolution rates, as determined…
At Forschungszentrum Jülich, glass-ceramic materials from the BaO-CaO-Al2O3-SiO2-system are used to join high temperature fuel cell stacks. Requirements for the sealant and characterisation of the glasses are shown in this paper. Characterisation is done in three steps: determination of glass properties, characterisat…