Materials Literature
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Silicates occur in a great number of minerals and rocks as well as in numerous technical products. Materials containing silicates constitute the basis of many different branches of industry. Apart from their principal applications in the construction, glass, and ceramic industries, siliceous materials have achieved an…
Abstract The linear rheological properties of high‐density polyethylene (HDPE), polystyrene (PS), and HDPE/PS (80/20) blends were used to characterize their structural development during extrusion in the presence of ultrasonic oscillations. The master curves of the storage shear modulus ( G ′) and loss shear modulus (…
Abstract In this study, the solvent adsorption phenomena of poly(vinyl alcohol) (PVA) in cosolvent mixtures of dimethylsulfoxide (DMSO; solvent 1) and water (solvent 2) were investigated. Typically, this cosolvent mixture could form hydrogen‐bonded DMSO/(water) 2 complexes, involving one DMSO and two water molecules.…
The structure of the 115 amino-acid residue protein DsvC was determined based on the anomalous scattering provided by the five S atoms present in the structure. By collecting the diffraction data at a wavelength of 1.9 A, the anomalous signal provided by the S atoms was enhanced. However, significant radiation damage…
In La-substituted ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}({\mathrm{Zr}}_{0.95}{\mathrm{Ti}}_{0.05}){\mathrm{O}}_{3},$ an increase in the La content $x$ served to convert the ferroelectric incommensurate (FI) phase into the antiferroelectric incommensurate (AI) phase around $x=0.01.$ In order to elucidate th…
A bigraft, composed of a 30-microm internodal distance expanded polytetrafluoroethylene (ePTFE) arterial graft segment and a preclotted polyethylene terephthalate arterial graft segment, was used to study the healing process of two different materials in the same dog. Healing was followed by FTIR-ATR spectroscopy and…
Eleven W-based catalyst systems for alkene epoxidation with aqueous H 2 O 2 were compared under identical conditions and at equal level of 0.1 mol % W-atoms. Of these, those based on a combination of H 2 WO 4 and a methyltrioctylammonium phase transfer catalyst turned out to be most active in particular systems that c…
Abstract Polypropylene's fire‐retardant properties can be improved by using modified kaolin. Modification was done by reaction of kaolin with a prepared resin–iron chelate. Polypropylene samples were loaded with different amounts of kaolin, modified kaolin, and their mixture. Ignition properties of the produced sample…
In this paper, the detection of crystalline elements in protein crystallization droplets containing precipitate is illustrated using the rotating-polarizer microscope technique. The sensitivity of this automated birefringence technique enables the detection of microcrystals in a precipitate that appears to be amorphou…
How far is an electron delocalized in organic conducting polymers? Insights into this aspect are presented by analyzing the spin distribution in radical cations of seven differently substituted aniline oligomers. The paramagnetic stages of dimers, tetramers, and hexamers were studied by EPR/ENDOR spectroscopy in fluid…
We analyze recent deuterium NMR data on blends of poly(ethylene oxide) (PEO) with poly(methyl methacrylate) (PMMA), using a model for the blend dynamics based on the coupling model. This model has previously been shown to describe the relaxation properties of blends whose component dynamics are strongly composition de…
The magnetic properties of $\mathrm{La}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{)}_{11.4}{\mathrm{Si}}_{1.6}$ $(0<~x<~0.08)$ compounds were investigated. A reentrant spin glass behavior for the sample with $x=0.06$ and a paramagnetic-to-spin glass transition for the sample with $x=0.08$ were observed.…
Abstract The air‐aging process at 120°C and the thermooxidative degradation of peroxide prevulcanized natural rubber latex (PPVL) film were studied with FTIR and thermal gravity (TG) and differential thermal gravity (DTG) analysis, respectively. The result of FTIR shows that the OH and COOH absorption of the rubber…
We report ferromagnetic and spin-wave resonance absorption measurements on high quality epitaxially grown ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ thin films. We find that these films exhibit robust ferromagnetic long-range order, based on the fact that up to seven resonances are detected at low…
We report the effect of Al substitution on the temperature-dependent electrical resistivity, Seebeck coefficient, as well as thermal conductivity in the binary compound cobalt monosilicide. It is found that the substitution of Al onto the Si sites causes a dramatic decrease in the electrical resistivity and lattice th…
The ter- and tetradentate N -alkoxyalkyl-β-ketoimines CH 3 C(O)CH 2 C(NCH 2 CHROH)CH 3 { L 1 - 3 } react with diethylaluminum chloride to afford the dimeric chloride bridged complexes [{ L 1 - 3 }AlCl] 2 ( 1a − c ), which are activated by addition of propylene oxide or cyclohexene oxide to afford efficient initiators…
Abstract Different titration methods were applied with the purpose to determine the dissociation properties of a natural (cotton) and regenerated (viscose, modal and lyocell) cellulose fibers. Potentiometric and conductometric titration were used to determine the content of acidic groups. pK values were determined by…
Hollowed materials of nanoscopic dimensions offer exciting possibilities in a number of fields such as therapeutics and imaging. The production of nanoscopic cage-like materials is described, based upon the excavation of shell cross-linked nanoparticle (SCK) templates. This report focuses upon extensive characterizati…
In this chapter we present an overview of what we regard as the most significant areas of recent activity in layered double hydroxide chemistry, using documents known to us through mid-2002, with occasional later examples. While we have attempted to give credit to the initiators in each area, we make no claims to ascr…
A simple dynamical system that models the competitive thermokinetics and chemistry of cellulose decomposition is examined, with reference to evidence from experimental studies indicating that char formation is a low activation energy exothermal process and volatilization is a high activation energy endothermal process…