Materials Literature
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The Cd 2+ -mediated assembly of multiporphyrin arrays at air−subphase interfaces has been studied. Surface pressure−area isotherms for the monolayers of zinc tetrapyridylporphyrin (ZnTPyP) showed that the mean ZnTPyP molecular area was 0.65 and 1.9 nm 2 on water and 0.1 M Cd 2+ subphase surfaces, respectively. Spectro…
A mathematical model for prediction of the compressional behaviour of woven reinforcement is described. The model accounts for the compression of yarns and the change of yarn crimp under pressure applied to a fabric layer. Compression curves of glass rovings are studied experimentally and serve as input for simulation…
We investigated the effect of A-site compound substitution on the structures and properties of Ca 0.8 (MCe) 0.1 Bi 4 Ti 4 O 15 (M denotes Li, Na and K) ceramics. The samples were prepared by the conventional ceramic technique. Sintering characteristics of Ca 0.8 (MCe) 0.1 Bi 4 Ti 4 O 15 and CaBi 4 Ti 4 O 15 ceramics w…
A semiempirical "universal" corresponding states relationship, for the dimensionless transport coefficients of dense fluids as functions of the reduced configurational entropy, was proposed more than 20 years ago and established by many simulations. Recent density functional analysis predicts a universal freezing-temp…
The three-dimensional structure of metastable exfoliated-restacked WS 2 (r-WS 2 ) has been determined by the atomic pair distribution function (PDF) technique. We show that the structure of r-WS 2 is not a random turbostratic assembly of layers, as previously thought, but it can be better regarded as a monoclinic stru…
In this work, isotactic poly(propylene) (iPP) was finely dispersed in immiscible atactic polystyrene (PS) matrices. When the dispersion obtained is fine enough (droplet size of approximately 1–2 μm), the iPP crystallizes in a fractionated fashion at temperatures between 104 and 42°C. By applying a self-nucleation proc…
This paper describes photoluminescence (PL) stabilization through chemical modification of freshly prepared porous silicon (PSi) surfaces. As-anodized PSi surfaces react with 1-alkenes, non-conjugated dienes and aldehydes at elevated temperatures to form organic monolayers covalently bonded to the surface. This therma…
We investigate interfacial and capillary phenomena in a simple model for a fluid of hard rods, viz. the Zwanzig model, in which the orientations of rectangular blocks are restricted to three orthogonal directions. The theory, which is based on an Onsager-like free energy functional, predicts local biaxial ordering at…
Structural and light-emitting properties of nanoparticles of ZnS:Mn annealed in vacuum at temperatures up to 525 °C are presented. Annealing the 3.5 nm particles at temperatures up to 350 °C caused growth of some particles without substantial change in the luminescence or ZnS lattice. After annealing at 400–525 °C, th…
The stability of derivatized mesoporous silicon mirrors in simulated human blood plasma has been assessed. The rate at which they are dissolved in-vivo is predicted to be tunable by surface chemistry over timescales of weeks to years, and high reflectivity can be maintained until the bottom of the multilayer stack sta…
PS has been shown to be an excellent candidate biomaterial following studies showing its biostability and non-toxicity. These favourable properties, coupled with the ease of its topographical manipulation, and its optoelectronic properties, make it an ideal material for the design of biologically interfaced devices (B…
Manufacturing ceramic powders and compacts by pyrolizing organosilicon polymers results in an amorphous microporous Si-O-C matrix with favorable high temperature strength and chemical stability compared to conventional porous organic matrices. Using this method the authors present the production of defect-free ceramic…
This paper presents an experimental characterization of the three-dimensional strain-hardening response of polycarbonate in the glassy state. Using a special mechanical conditioning technique, large homogeneous deformations were obtained in tension, compression, and shear. The experimental results are compared to a nu…
The Boltzmann transport equation can be solved to give analytical solutions to the resistivity, Hall, Seebeck, and Nernst coefficients. These solutions may be solved simultaneously to give the density-of-states effective mass (md*), the Fermi energy relative to either the conduction or valence band, and a scattering p…
Severe plastic deformation provides a processing tool for introducing fine grain sizes into polycrystalline materials. This paper describes the principles of equal channel angular pressing (ECAP) in which a material is pressed through a die where two channels form an L shaped configuration. The process of ECAP imposes…
An inner-coordinated Pd complex and inner- and outer-N coordinated, double-decker Pd complexes of N-confused tetratolylporphyrin have been synthesized, and their structures were elucidated by X-ray single-crystal analyses.
Multiwavelength anomalous diffraction (MAD) phasing has become a routinely used tool for determining new macromolecular structures. The MAD method has stringent data-collection requirements, typically necessitating radiation-resistant crystals and access to a tunable synchrotron beamline. In cases where synchrotron ti…
A precursor for magnesium aluminum spinel powder, composed of crystalline ammonium dawsonite hydrate (NH 4 Al(OH) 2 CO 3 ·H 2 O) and hydrotalcite (Mg 6 Al 2 (CO 3 )(OH) 16 ·4H 2 O) phases, was synthesized via precipitation, using ammonium bicarbonate as the precipitant. The precursor was characterized by differential…
Magnetic properties of Ni nanowires electrodeposited into self-assembled porous alumina arrays have been investigated. By anodizing aluminum in sulfuric acid and immersing the as-anodized template into phosphoric acid for different lengths of time, we are able to vary the diameters of the subsequently deposited nanowi…
Equal channel angular extrusion has been used to deform an Al–3 wt-%Mg alloy to an effective strain of 10, resulting in a 0.2 µm grain size. In the as deformed condition the yield strength was increased to ∼500 MPa. During annealing the grain structure coarsened uniformly and the yield stress was found to follow the H…