Materials Literature
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The dynamics of porphyrin ring inversion of a number of Fe(III) complexes of octamethyltetraphenylporphyrin, (OMTPP)Fe(III); octaethyltetraphenylporphyrin, (OETPP)Fe(III); octaethyltetra(perfluorophenyl)porphyrin, (F(20)OETPP)Fe(III); and tetra-beta,beta'-tetramethylenetetraphenyl-porphyrin, (TC(6)TPP)Fe(III), having…
A potentially serious problem that may arise with nonradiative dielectric ( NRD ) guide circuitry is described. First, a small unwanted air gap would generate a leaky hybrid mode that could produce cross talk between components of a circuit, and, second, if the plate width were also finite another type of leaky mode w…
Structure and Photoluminescence of Nano-ZnO Films Grown on a Si (100) Substrate by Oxygen- and Argon-Plasma-Assisted Thermal Evaporation of Metallic Zn, Lu Li-Xia, Tang Qin-Xin, Shao Chang-Lu, Liu Yi-Chun
Hexagonal strontium ferrite (SrFe 12 O 19 ) powders were synthesized by the conventional ceramic techniques. They were then characterized by the X-ray diffraction method and incorporated in the natural rubber matrix according to a specific recipe for various loadings of ferrite to produce rubber ferrite composites (RF…
Fringing electric fields emanating from an electrode edge in electromechanically coupled materials can potentially lead to cracking from a strain incompatibility of the active and inactive regions. Partial electrodes and specimen geometry are studied in single crystal PZN-4.5%PT to characterize the fracture behavior n…
The S = 2 complex, manganese(III) meso-tetra(4-sulfonatophenyl)porphine chloride (Mn(III)TSPP) is a highly efficient relaxation agent with respect to water protons and has been studied extensively as a possible MRI contrast agent. The NMR relaxation mechanism has several unique aspects, key among which is the unusual…
[reaction: see text] A novel synthetic approach to diversely functionalized "locked" chlorins is described. A suitably substituted 2,5-diformylpyrrole undergoes the macrocyclization reaction with tripyrranes, thereby generating porphyrins. Upon the reaction with 1,3-dipoles these porphyrins regioselectively furnish py…
Abstract The use of polymers containing metal salts as ceramic high‐temperature superconductor (HTSC) precursors may provide a relatively simple and rapid method for producing materials that can take advantage of advanced polymer processing and then be pyrolyzed to HTSCs. The mechanisms of thermal degradation in these…
The application of a novel kaoline in the natural rubber (NR) system is studied. First, the cure properties are tested; second, the mechanical properties of the novel kaoline-filled system are studied; third, its replacement of carbon black in NR system is compared; meanwhile, the application of the novel kaoline into…
Ag-doped Ge2Sb2Te5 films were deposited by rf magnetron sputtering on SiO2/Si substrates. The content of Ag ranging from 4.5 to 11.3 at.% is determined by inductively coupled plasma atomic emission spectrometry. The crystallization temperature of Ag-doped Ge2Sb2Te5 increases with the increasing Ag content and the stab…
Abstract The investigation of CdCl 2 ‐HIO 3 system, in aqueous and HNO 3 solutions, revealed that anhydrous cadmium iodate presents a marked polymorphism. No less than four new Cd(IO 3 ) 2 polymorphs have been isolated and characterized, two of which showing second harmonic generation activity. Single crystals of ε‐Cd…
A study has been made of the scanning properties of solid dielectric bifocal lenses. In two dimensions, a bifocal lens is a two-surface lens, symmetric about an axis, designed to collimate the rays from a primary point source lccated at either of two conjugate off-axis positions into plane waves making angles+\alphaan…
The clay-reinforced ethylene propylene diene terpolymer (EPDM) nanocomposites with organo-montmorillonite (OMMT) and EPDM-clay conventional composites with pristine MMT are compared in terms of their morphology, mechanical properties, and solvent resistance. The maleic anhydride grafted EPDM (MAH-g-EPDM) is used as th…
Abstract Terpolymer resins (BPhUF) were synthesized by the condensation of 2,2′‐dihydroxybiphenyl [BPh] and urea [U] with formaldehyde [F] in the presence of an acid catalyst and using varied molar ratios of reacting monomers. Terpolymer resin compositions have been determined on the basis of their elemental analysis…
Different types of natural fiber composites with thermoplastic matrices have been extensively investigated, especially with polyolefins. However, the ability of these fibers as reinforcement of technical matrices has been less studied. This study evaluates the possibilities of using fique fibers (hard fibers) obtained…
Waste silk fabric-reinforced epoxy laminates were developed with varying content of silk fabric. The mechanical properties like tensile strength and flexural strength of the composites were determined. These properties were found to increase with silk fabric content. These composites also showed good chemical resistan…
Surface and cross-sectional residual stresses of electrochemical etching porous silicon are investigated quantitatively by micro-Raman spectroscopy. The results reveal that a larger tensile residual stress exists on the surface and increase linearly with the porosity. On the other hand, across the depth direction perp…
Polyaniline (PAn) is a commercially viable conducting polymer exhibiting enough metallic conductivity to replace carbon/metal filled composites as a shield to control electromagnetic radiations. In this paper, we discuss the process to achieve a pore-free conducting fabric reinforced with PAn. The process involves the…
Mechanical and dielectric loss measurements were carried out in the BaTiO 3 ceramics doped with Co at frequencies between 0.01 Hz and 1 MHz as a function of temperature from −150° to 150°C. The relaxation peak observed in the ferroelectric phase with an activation energy of 0.27 eV is assumed to be related to the moti…
The crystallization of fats has been extensively studied because of its importance in the processing of food and food ingredients. Differential scanning calorimetry (DSC) is widely used in such studies. The aim of this study was to examine the determination of kinetic parameters from nonisothermal DSC crystallization…