Materials Literature
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A novel nanomaterial, an array of zinc oxide (ZnO) and polyaniline (PANI) coaxial nanowires, was synthesized using an anodic aluminum oxide (AAO) membrane as the template. The morphology of these coaxial nanowires was observed with transmission electron microscope (TEM). The experiments on photoluminescence (PL) of co…
Tyrosine-based pseudo-peptide polymers, first introduced in 1987 by Kohn and Langer, have been identified for potential biomaterial applications. These materials combine the desired polypeptide properties of biocompatibility, biodegradability, non-toxicity, and non-immunogenicity with good processing properties includ…
Numerous thermal vacancies are frozen into FeAl B2-ordered alloy ribbons by a conventional rapid-solidification technique. Through heat treatment at 723 K, clustering of the supersaturated vacancies generates a large number of nanopores, particulary near surfaces, thus creating nanoporous surfaces. The nanoporous surf…
Chemical regulation of secondary-metabolite synthesis was investigated through the improvement of poly-3-hydroxybutyrate (PHB) production in transgenic tobacco plants by the use of enzyme inhibitors. Two tobacco lines, BC3 and rCAB8, that produce PHB in both the cytosol and plastids were used. An acetyl-CoA carboxylas…
The time dependence of the formation and decay of irradiation-induced optical absorption centers in magnesium aluminate spinel single crystals of different compositions (MgO - 1.0Al 2 O 3 and MgO - 2.5Al 2 O 3 ) was investigated. The kinetics of accumulation of X-ray irradiation-induced absorption bands is consistent…
This paper reports on the first use of an in situ electrochemical strain gage method for the monitoring of the mechanical properties of conducting and redox electroactive polymers as they are switched between their neutral and oxidatively doped forms. Electrodeposition of three conducting polymers, specifically polypy…
Boron-doped diamond film on a quartz crystal electrode was prepared by a reflow technique. The mass sensitivity of this diamond-quartz crystal microbalance (QCM) sensor was determined by performing electrodeposition. This novel electrochemical QCM sensor was quite stable under several electrochemical experimental cond…
ABSTRACT The viscoelastic behavior of bread crumb was studied using dynamic mechanical analysis (DMA) in the compression mode with the frequency sweep. The dynamic storage modulus (E′), loss modulus (E″), and tanδ (E″/E′) were measured for bread crumb aged up to three days at ambient temperature. The viscoelastic prop…
High efficiency Hybrid Systems (HS) based on the coupling of Solid Oxide Fuel Cells (SOFCs) and Gas Turbines (GT) are analysed in this paper through the use of two different approaches: simplified and detailed SOFC models. The simplified model, already presented by the Authors1, is very useful for HS design and off-de…
Abstract In the spring of 1997, seven companies and industry associations from the USA and Canada decided to sponsor the cone calorimeter interlaboratory test programme. Reproducibility and repeatability were determined for the scalar variables measured in the cone calorimeter (ASTM E1354) according to the protocol de…
The number of publications and scientific meetings in the field of ferroelectricity has been increasing exponentially in the last 30 years. In addition to the classical fields of phase transitions and critical phenomena four new sub fields have emerged: a) ferroelectric liquid crystals, b) thin films and integrated fe…
The substitution reactions of the coordinated acetonitrile molecule in [Ni(L)(MeCN)][BF4]2 (1) {L = 2,5,8-trithia[9],(2,9)-1,10-phenanthrolinophane} with three potentially bidentate ligands L′ (L′ = N3−, 4,4′-bipyridine and F−) have been studied both in solution and in the solid state with the aim of verifying the pot…
The electronic structure of different phosphorus carbide solid phases with stoichiometry P4C3 is studied using first-principles density-functional calculations; the lowest energy phase is cubic defect zinc-blende with graphitic phases much higher in energy.
Dimerization of free acid and ester forms of disulfonated deuteroporphyrin is investigated in aqueous solution by absorbance and fluorescence spectroscopies. The dimerization equilibrium constant increases with the extent of esterification. In phosphate buffer saline (pH 7.4, 20 degrees C), it ranges from 1.4 x 10(6)…
The feasibility of intelligent utilization of iron-aluminum scraps is explored in this work. Through adding aluminum which is contained in the scraps to cast iron, the changes in wear resistance, heat resistance and damping property of aluminum-alloyed cast irons were systematically investigated. Superior properties w…
En-coordinated lithium salts of binary or ternary hexachalcogenodistannates(IV), Li4Sn2E6 · 8en (E = S (1), Se (2), Te (3)), Li4Sn2S1.36Se4.64 · 8en (4), Li4Sn2Se2Te4 · 8en (5 a), Li4Sn2Se2Te4 · 9en (5 b), and Li4Sn2S2Te4 · 10en (6) (en = 1,2-diaminoethane) were synthesized by extraction of Li/Sn/E or Li/Sn/E/E′ phase…
Ti and Ti alloys have a series of outstanding properties,such as small densities,high specific strengths and rigidities,excel- lent corrosion-resisting and antifatigue properties,good high-temperature behaviors and wedding performances and so on,and have been extensively applied to military(aerospace,et al)and civil(a…
Constitutive properties of concrete under dynamic loading play an important role in the analysis of concrete structures subject to impact loading.There are many defects such as micro crack and micro void inside the concrete material.Damage softening has a great influence on the mechanic behavior of concrete under impa…
Fibernodes in flax, hemp and stinging nettle fibers were studied using light microscopy(1). The fibers were prepared both mechanically and chemically. The observations showed that flax, hemp and stinging nettle fibers carry numerous unevenly distributed disturbances that we name fibernodes, visible as single or double…
The comparison of degradation of modified poly(e-caprolactone) film in different environments is presented. Poly(e -caprolactone) was incubated in a natural environment - sea water (the Baltic Sea), in buffered salt solution, in liquid medium containing sea water with NaN3 and in compost with plant treatment activated…