Materials Literature
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Abstract Samples of Silica Springs allophane from Tongariro National Park, New Zealand, having Al/Si atomic ratios in the range 1.1-1.9, were studied by 27 Al nuclear magnetic resonance (NMR) spectroscopy with high field strength (9.4 and 11.7 T) and fast magic-angle spinning (MAS) (9-13 kHz). Spectra for all samples…
Changes in surface reactivity produced by different types of liming in a Chilean Andisol were determined. Barros Aranas soil with 53% aluminum (Al) saturation and 4.8 pH was incubated with different amounts of calcitic and dolomitic lime. Each cmol of calcitic or dolomitic lime applied per kg of soil increased the pH…
In order to attempt to industrial applications of superplastic forming, the present authors have investigated to design high strain rate superplastic zirconia ceramics. Very recently we found a new ceramic with high strain rate superplasticity (HSRS). A new ceramic, ZrO 2 (3Y)-2mol%CaO-2mol%TiO 2 were examined at defo…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and the Initiator Activity of Fluorenyltriphenylphosphonium Salts in the Cationic Polymerization of Epoxide. Novel Thermally Latent InitiatorsTatsuya Toneri, Ken-ichi Watanabe, Fumio Sanda, and Takeshi EndoView Author Information Research Laboratory of Resources Utili…
Silica powders and films with embedded organic liquids (OLs) that are storage stable can be prepared with high OL concentrations when modern sol-gel techniques are used. The preparation and thermal release behavior of silica sol-gel glasses with different embedded organic liquids are described and the results discusse…
Abstract The structure of antimonian dussertite, (AsO 4 ) 2 (OH,H 2 O) 6 , has been refined in space group R3̄ m with a 7.410(3), c 17.484(4) Å, Z = 3, to R = 3.2 % and R w = 3.7 % using 377 observed reflections with I ≥ 3 σ( I ). The structure is of the alunite-type and consists of sheets of corner-sharing (Fe 3+ ,Sb…
Abstract Pd catalysts supported on various metal oxides were investigated for the low-temperature catalytic combustion of methane. Of the catalysts examined, a Pd/SnO2 catalyst demonstrated excellent activity despite its low specific surface area. The activity of the Pd/SnO2 catalyst was lowered with the addition of M…
In this paper, we investigate the vibrational FT-IR and FT-Raman spectra of a series of α,α‘-diethyl substituted oligothiophenes with variable chain lengths (from trimer to hexamer) in the neutral state. The experimental data support the existence of an effective intramolecular delocalization of the π electrons. Ab in…
Temperature-dependent neutron powder diffraction experiments (diffractometer 3T2-LLB, Saclay, France, lambda = 1.227 Å) have been performed on the perovskite-like lead hafnate titanate PbHf(0.4)Ti(0.6)O(3). This compound belongs to the solid solution denoted PHT, which derives from the well known ferroelectric PZT ser…
We use the data generated in recent first-principles molecular-dynamics simulations of liquid selenium at the temperatures 570, 870, and 1370 K to investigate defects in the liquid. The defects represent disruptions of the chain structure associated with onefold and threefold atoms ${(C}_{1}$ and ${C}_{3}$ defects). W…
Site-specific mutants have been produced in order to investigate the role of proline 204 in the 'hinge' region of yeast phosphoglycerate kinase (PGK). This totally conserved proline has been shown to be the only cis-proline in the high resolution crystal structures of yeast, B. stearothermophilus, T. brucei and T. mar…
Sr5(VO4)3(CuO) was prepared via solid state reactions from mixed powders of the metal oxides or carbonates in corundum crucibles in air (1173–1740 K). The compound is transparent and stable in air. The color changes with the preparation temperature from light gray (1173 K) to gray (1740 K). The crystal structure (spac…
Mechanisms of defect formation near surface ledges of a diamond cubic crystal subjected to compressive strain parallel to the surface are investigated as precursory processes to dislocation nucleation in Si1-xGex/Si(100) heteroepitaxial thin films under surface diffusion conditions. This study is motivated by our prel…
Two standard methods have generally been used to prevent destructive ice formation when flash cooling macromolecular crystals for cryocrystallography: (i) permeating the crystal lattice with a cryoprotectant, or (ii) replacing the external liquid around the crystal with an immiscible oil. In two cases where both of th…
Abstract Physicochemical characteristics of sediment unrelated to contaminant levels and bioavailability may influence the outcome of toxicity tests. In particular, sediment organic matter content has the potential to be a confounding factor in toxicity tests using the midge larva Chironomus tentans because the larvae…
Only a small fraction of the high-dimensional parameter space that governs the occurrence of stable single-bubble sonoluminescence (SBSL) has been explored so far. We predict that decreasing the acoustic driving frequency $f$ upscales SBSL. More specifically, at $f\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}5\m…
The polymer absorption model developed by Vrentas and Vrentas is applied to the wool/water isotherm. In principle, all parameters in this model can be determined independently of sorption behavior so that a genuine prediction can be made. This model emphasizes the role of the glass transition in generating the sigmoid…
A Biopol-jute composite (BJC) was prepared using a hot-press treatment by reinforcing the Biopol polymer with hessian cloth (jute fabrics) placed in between the layers of Biopol polymer films. Both the tensile and bending strengths of the composite increased substantially, in comparison to the pure Biopol. Jute fabric…
The development of a cast forming process for ceramics based on agarose gelation is described and the properties of green and sintered bodies are presented. For this process, a warm alumina slurry containing more than 50 vol.-% solids loading and ∼1 wt-% agarose binder (Al2O3 basis) is cast into a relatively cold, non…
We have investigated the sorption behavior of polystyrene brushes with thicknesses of 10−200 nm in toluene vapor. The sorption curve displays a kink, which is attributed to the solvent-induced glass transition. The derivative of the sorption curve with respect to solvent activity (“osmotic capacity”) shows a glass ste…