Materials Literature
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A predictive scheme is proposed for the simultaneous calculation of the modulus and yield (or tensile) strength of ternary polymer systems. According to the continuity or discontinuity of constituting phases, the scheme combines in two steps the models for binary systems: (i) in the interval of phase duality (co-conti…
The thin sheets of calcite, termed folia, that make up much of the shell of an oyster are covered by a layer of discrete globules that has been proposed to consist of agglomerations of protein and mineral. Foliar fragments, treated at 475 degrees C for 36 h to remove organic matter, were imaged by atomic force microsc…
The electronic excitation energies of boron nitride in the layered hexagonal (h-BN), zincblende (c-BN), and wurtzite (w-BN) structures under applied pressure and lattice stretching have been studied. Hydrostatic pressure applied on denser phases c-BN and w-BN has been considered, on the other hand for h-BN both hydros…
The metastable pitting behaviour of galvanically coupled and potentiostatically controlled A516–70 carbon steel in a chloride containing solution has been statistically analysed. It is shown that the pitting activity, indicated by the pit initiation rate, depends on immersion time, applied potential, and chloride conc…
Abstract The intercalation complex of a low-defect (“well-crystallized”) kaolinite from Cornwall, England, with hydrazine was studied by high-temperature X-ray diffraction (HTXRD), differential thermal analysis (DTA), and thermogravimetry (TG). The X-ray pattern at room temperature indicated that intercalation of hydr…
Abstract The rheological properties of calcium carbonate‐filled polypropylene were examined using a Rheometrics dynamic analyzer. The study included steady shear test, transient stress growth test with sequential deformation history, and two‐step dynamic oscillatory shear flow. Thixotropic behavior was observed in tra…
Unusual large magnetostrictions as well as anisotropy compensation have been found in quaternary ${\mathrm{Sm}}_{0.9}{\mathrm{Pr}}_{0.1}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{)}_{2}.$ The magnetostriction constants ${\ensuremath{\lambda}}_{111}$ and ${\ensuremath{\lambda}}_{100}$ at room temperature are $\…
The bulk polymerisation of ε-caprolactone initiated by tetrapropoxy titanium was investigated in a co-rotating twin screw extruder. The process dynamic modelling, based on pressure measurements, was achieved via a combination of rheological modelling coupled with residence time distribution modelling. The former was d…
Abstract X-ray diffraction (XRD), Rb-Sr isotope analysis, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and Fourier transform infrared (FTIR) methods were used to study diagenetic illite and illite-smectite (I-S) in Lower Cambrian unlithified clays of shallow depth of burial in th…
Abstract Synthesis of large zeolite A and X crystals by a modified Charnell’s method led to the formation of twinned zeolite NaA crystals, overgrowth of NaX onto NaA and co-crystallization of another phase analysed by electron microprobe as a Na aluminosilicate but not yet identified. Single crystals of NaA have a per…
An electron cyclotron resonance (ECR) plasma source (10 cm in diameter) has been developed for ion assisted sputter deposition of thin films. Variation of plasma parameters like ion density, electron temperature, plasma potential, and floating potential as a function of pressure and microwave power has been studied us…
Silicon carbide coatings of carbon substrates have been synthesized by reactive pack cementation. The cement was a SiC–SiO2 powder mixture, and the temperature investigated ranged from 1400 to 1700 °C under an atmospheric pressure of argon (104 kPa). From both thermogravimetric analyses (TGAs) and density measurements…
We carried out a study of dehydration in natural metamict and crystalline samples of titanite between 20 and 1060 K. Infrared absorption spectra of crystalline titanite show at least five O–H stretching bands in the region between 2000 and 4500 cm −1 . Metamict samples show a broad distribution of stretching modes bet…
Rice husks (RH) were chemically modified with glycidyl methacrylate (GMA). The chemical loading of the GMA (weight percent gain, WPG) increased as the reaction time was increased. The modification of RH with GMA gave enhanced flexural, tensile and impact properties of rice husk-polystyrene (RH-PS) composites. These ma…
The magnetodeformation effect in a uniform field of a ferroelastic material has been calculated under some simplifying assumptions about the properties of ferromagnetic particles. The results obtained are compared with the known experimental data.
Field-induced phase transitions of antiferroelectric–ferroelectric nature have been investigated in the Pb0.98La0.02(Zr0.70Hf0.30)1−xTixO3 system. Samples of compositions 0.065⩽x⩽0.10, located in the vicinity of an antiferroelectric–ferroelectric phase boundary, were analyzed by x-ray diffraction, by dielectric, and b…
Single crystals of MnThTe3 (1) and MgThTe3 (2) grow as small black plates from the stoichiometric reaction of the elements, the former at 1,000 degrees C and the latter at 900 degrees C with the aid of a Sn flux. Both compounds crystallize in the space group Cmcm of the orthorhombic system with four formula units in c…
One of the most important problems associated with use of polyaniline as a cathode material in rechargeable lithium batteries is related to energy density degradation due to the predomination of anion participation in the charge compensation process. This work describes the synthesis of a self-doped polyaniline, poly-…
Enthalpy relaxation of epoxy–diamine thermosets of different crosslink lengths (CLL) has been studied by DSC. The epoxy resins based on diglycidyl ether of bisphenol A were cured with ethylenediamine (FEDA), and diamines of polyoxypropylene of 2.6 and 5.6 oxypropylene units, named FJ230 and FJ400, respectively. As was…
The redox processes of secondarily doped and the pre-heated primarily doped polyaniline (150oC, 6-12 h) were investigated by in-situ resonance Raman spectroscopy. Raman spectra of secondarily doped polymer is more dependent on potential than those observed in the pre-heated primarily doped polymer. These different beh…