Materials Literature
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The translational and rotational dynamics, including the translational−rotational coupling, of collagen in an aqueous 0.25 mg/mL solution of 0.1 N HCl were studied by polarized dynamic light scattering. An autocorrelator with variably spaced delayed times allowed computation of dynamic light-scattering intensity autoc…
New high efficiency thermoelectric materials with ZT values substantially larger than 1.0 have been recently developed. The successful development of a segmented thermoelectric generator utilizing a combination of state-of-the-art thermoelectric materials and these novel thermoelectric materials could result in a high…
The effect of iron content on the structure of xFe 2 O 3 (100-x)P 2 O 5 , (15≤x≤50), glasses was investigated by Raman spectroscopy and x-ray diffraction. The Raman spectra for these glasses indicate that the nature of the phosphate network changes from the chain like metaphosphate to the orthophosphate structure with…
We have studied a system of N=10 3 discotic particles with a central axial dipole using Monte Carlo computer simulations. We have investigated four temperatures corresponding to isotropic, nematic and columnar liquid-crystal phases determining the molecular and dipolar distributions and the length of the polar domains…
The objective of this study was to produce polylactic acid (PLA) microspheres containing bovine insulin as a sparingly water soluble model drug using a water-in-oil-in-water (w/o/w) emulsion solvent evaporation method. The preparative conditions were optimized. Employment of smaller internal aqueous phase volume (50 m…
The consequences of a glass transition occurring in one of the two phases formed by spinodal decomposition of a liquid mixture are investigated by numerical solution of the deterministic Cahn-Hilliard equation for two dimensions with a concentration-dependent mobility. The glass transition is modelled by a rapid decre…
A new building BLOCK approach to synthesis has been developed where functionalised norbornenes (BLOCK A) are coupled with functionalised cyclobutene epoxides (BLOCK B) to produce A + B structures of defined geometry; use of a dual (spacer) BLOCK allows the formation of large structures where crown ether, ligand and re…
A theory is proposed for the formation of superabundant vacancies in metal-hydrogen alloys, amounting to 10∼20 at%, considering hydrogen effects to decrease the formation energy of a vacancy by cluster formation and the configurational entropy of the system at high hydrogen concentrations. A formula derived for the va…
Six trinuclear linear complexes [LMnIII{µ-(niox)3MII}MnIIIL]2+ 1–3 and [LMnIV{µ-(niox)3MII}MnIVL]4+ 4–6 where M represents either Zn (1 and 4), Cu (2 and 5) or Mn (3 and 6), containing three cyclohexane-1,2-dione dioximate dianions (niox) as bridging ligands and 1,4,7-trimethyl-1,4,7-triazacyclononane (L) as the cappi…
A new versatile reagent, a perfluorosulfonate/trisilanol [(OH) 3 Si(CH 2 ) 3 (CF 2 ) 2 O(CF 2 ) 2 SO 3 - M + ], is synthesized and a series of surface bound strong solid acid catalysts developed which are active for catalyzing a range of reactions, for example alkene isomerization, alkylations and acylations.
The metal-free and nickel derivatives of hexaoctylpyridino[3,4]tribenzoporphyrazine generate conventional face-to-face aggregates in solution, exhibit columnar mesophases and form columnar assemblies upon evaporation of solutions. By contrast, the zinc derivative forms alternative edge-to-face complexes through axial…
Fibrous, powdered fibrous, and acid-washed celluloses, newsprint, and paper dunnage were examined by Pyromat micropyrolysis to determine volatile organic compound evolution kinetic parameters. For the cellulose samples, the interpolated T max values (temperature of maximum evolution rate for a constant heating rate) i…
Poly(ether ether ketone)/poly(ether diphenyl ether ketone) blend containing 30 wt% PEDEK was used to investigate the melting behaviour of immiscible PEEK/PEDEK blends. The results measured from differential scanning calorimetry (d.s.c.) and wide-angle X-ray diffraction (WAXD) showed that immiscible PEEK/PEDEK blends i…
Excitation spectroscopy of the 7 F 0 → 5 D 0 transition of Eu 3+ in the visible has been used to quantitate the complexation of this ion to various chelating carboxylate ligands including 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetate (dota). Two methods were employed. The first involves the measurement of condi…
Various surface coatings, including duplex Ni(undercoat)/Cr(topcoat), multilayer Ni/Cu/Ni/Cr, Zn, bright Ni, bright Au, and black epoxy were applied to improve the corrosion resistance of the Nd-Fe-B magnet. The corrosion behavior of the surface-coated magnets was studied using Normal and Acetic Acid Salt Spray Tests.…
We study the application of the adiabatic switching molecular dynamics method to determine bulk and vacancy-formation Gibbs free energies as a function of temperature at zero pressure for copper. The bulk free energy has been determined through isochoric isothermal switching procedures in which a system consisting of…
The local environments about the cobalt atoms in as-synthesised, calcined and hydrogen-reduced CoSAPO-34 have been studied by X-ray absorption spectroscopy. Calcination of the as-synthesised material and reduction in hydrogen of the product of calcination were carried out at 450 °C and for 6 h, respectively. The resul…
ZnS thin films are made by laser driven chemical vapor deposition (CVD) from a single-source precursor, Zn(S 2 COCHMe 2 ) 2 under vacuum conditions. Photofragments in the gas phase are identified simultaneously by luminescence spectroscopy. The laser selectively activates the initial decomposition of the precursor and…
The effect of DC flux on the core loss is examined for the practical range of power and frequency. Relevant core loss equations are derived and applied to an optimization algorithm to determine the minimum core loss at a given ratio of s (DC flux density to AC peak flux density). It has been found that the curves of h…
The tensile stress dependence of magneto-impedance (MI) in CoSiB and CoFeSiB amorphous wires is reported. A phenomenological model for the transverse susceptibility based on a simple domain structure, and which includes the magneto-elastic energy contribution, is used. The square-root of the transverse susceptibility…