Materials Literature
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30 years of IrIII coordination chemistry with polyimine-type ligands are summarized. Over the years, milder reaction conditions have been used for their synthesis, allowing the incorporation of various functional substituents. Complexes are described with bidentate and terdentate ligands, with both N- and C-donor site…
A thermodynamics-based variational method is developed to establish the equations of motion for three-dimensional (3D) interacting dislocation loops. The approach is appropriate for investigations of plastic deformation at the mesoscopic scale by direct numerical simulations. A fast sum technique for determination of…
The brucite-like Mg2+/Al3+ layered double hydroxide (LDH) was synthesized by using the coprecipitation method and calcined at a variety of temperatures. The starting LDH and the calcination products (mixtures of binary oxides and spinels) were characterized by X-ray diffraction, IR spectroscopies and thermogravimetric…
Research Article| January 01, 2000 Jarosites and Their Application in Hydrometallurgy John E. Dutrizac; John E. Dutrizac Mining and Mineral Science Laboratories, CANMET, Natural Resources Canada, 555 Booth Street, Ottawa, Ontario, Canada K1A OG1 Search for other works by this author on: GSW Google Scholar John L. Jamb…
Solution pH was measured using water proton NMR via chemical exchange dependent saturation transfer (CEST) with selected chemical exchange sites. Several useful pH-sensitive proton chemical exchange agents were found: 5,6-dihydrouracil, 5-hydroxytryptophan, and a combination of 5-hydroxytryptophan and 2-imidazolidinet…
The skeletons of many organisms are composed of high-magnesian calcite(10–40 mol.-% Mg), which is not stable under equilibrium conditions. Here, high magnesian calcite particles (>20 mol.-%) are produced at ambient temperature in the presence and absence of additives. Most importantly these particles are shown to init…
A series of polyurethanes from polyols derived from soybean, corn, safflower, sunflower, peanut, olive, canola, and castor oil were prepared, and their thermal stability in air and nitrogen assessed by thermogravimetric analysis, FTIR, and GC/MS. Oil-based polyurethanes generally had better initial thermal stability (…
This article is a portion of a comprehensive study on carbon nanofiber–reinforced thermoplastic composites. The thermal behavior and dynamic and tensile mechanical properties of polypropylene–carbon nanofibers composites are discussed. Carbon nanofibers are those produced by the vapor-grown carbon method and have an a…
The objective of this study was to determine whether chitosan (poly-beta-1,4-glucosamine) and hydrolysates of chitosan can be used as novel preservatives in foods. Chitosan was hydrolyzed by using oxidative-reductive degradation, crude papaya latex, and lysozyme. Mild hydrolysis of chitosan resulted in improved microb…
Delamination of the layered double hydroxide structure [Zn2Al(OH)6][C12H25SO4 ·nH2O] was realized by dispersion in butanol; translucent colloidal solutions are stable for at least 8 months with oriented LDH materials with extended crystallite size being obtained; the results presented here suggest that total delaminat…
A new two-step desolvation method for manufacturing gelatin nanoparticles was developed. After the first desolvation step, the low molecular gelatin fractions present in the supernatant were removed by decanting. The high molecular fractions present in the sediment were redesolved and then desolvated again at pH 2.5 i…
A mathematical model is developed to describe the impedance response of a porous electrode composed of spherical intercalation particles. The model considers a porous electrode without solution‐phase diffusion limitations. The model is developed by first deriving the impedance response of a single intercalation partic…
The addition of nanometric fillers ( e.g. , , ) to polymer electrolytes induces consistent improvement in the transport properties. The increase in conductivity and in the cation transference number is attributed to the enhancement of the degree of the amorphous phase in the polymer matrix, as well as to some acid‐bas…
The use of nanometre thick silica shells as a means to stabilize metal clusters and semiconductor particles is discussed, and its potential advantages over conventional organic capping agents are presented. Shell deposition depends on control of the double layer potential, and requires priming of the core particle sur…
A new mesoporous carbon (NMC) was prepared, and its performance in an electric double‐layer capacitor (EDLC) was compared to that of a conventional carbon (a molecular‐sieving carbon, MSC25). The effect of pore size and pore connection pattern on EDLC performance was demonstrated. To prepare NMC, phenol resin was synt…
This account highlights developments in the field of supramolecular tetrathiafulvalene (TTF) chemistry. Progress in synthetic TTF chemistry during the past decade has allowed the preparation of a number of elaborate molecular systems based on host–guest interactions being able to act as either sensors, molecular switc…
A single crystal of ordered double perovskite oxide ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6},$ a conducting ferromagnet with ${T}_{C}\ensuremath{\sim}420\mathrm{K},$ has been prepared by the floating zone method, and the magnetic and electronic properties have been investigated. It has been found that the ordinary and a…
This article presents a survey of recent applications of advanced computer modelling techniques in the study of ion transport and defect properties of ABO3 perovskite-structured oxides. The principal methodologies are outlined which include techniques based upon both interatomic potentials (static lattice, molecular d…
The type and stability of Pickering emulsions stabilised by disc-like Laponite RD clay particles are described. By establishing the phase diagram of aqueous dispersions as a function of clay and salt (NaCl) concentration, we deduce that toluene-in-water (o/w) emulsions, stable to creaming and coalescence for at least…
The ASTRAL compendium provides several databases and tools to aid in the analysis of protein structures, particularly through the use of their sequences. The SPACI scores included in the system summarize the overall characteristics of a protein structure. A structural alignments database indicates residue equivalencie…