Materials Literature
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L-Pyroglutamate (PGA) is naturally occurring from L-glutamate solution with accelerated formation rate under high temperature and low pH. Even though PGA has been identified as a neurotoxic agent on brain cells, the effect of PGA on the growth of microorganisms is rarely known. Here various kinds of microorganisms dif…
Abstract Based on the primary principles of biomineralization, CaCO 3 similar to that in biominerals was synthesized through biomimetic synthesis under the self‐assembly of sodium acrylate. In our experiment, the formation of the calcium carbonate and the polymerization of sodium acrylate took place simultaneously thr…
AbstractThe development of thermal stress during the diffusion bonding of Al2O3 ceramic to aluminium is analysed via the finite element analysis method using a commercial software package, namely, MARC/MENTAL. Before diffusion bonding, a 0.2 mm copper layer is sintered onto the ceramic. The results show that shear str…
Three banana-shaped achiral compounds, derivatives of 4,6-dichloro-1,3-phenylene bis-[4-(4-n-octyloxyphenyliminomethyl) benzoate], were synthesized by varying the substituent (X = H, F and Cl). Their mesomorphic properties were investigated by differential scanning calorimetry, polarizing optical microscopy, and X-ray…
Acylhomoserine lactone (AHL) synthases act as chemical communication signals or pheromones in Gram-negative bacteria and regulate diverse physiological events in a cell density-dependent manner. The recent crystal structure determination of EsaI, a key enzyme in this pathway, shows that the AHL synthase superfamily me…
Abstract The improved fire performance of polyamide‐6 clay nanocomposite compared with polyamide‐6 are correlated with their degradation kinetic parameters. Moreover substituting polyamide‐6 by polyamide‐6 clay nanocomposite in an intumescent blend enables to improve its fire properties. Once again, the improved fire…
A new method of porous silicon fabrication is suggested which uses as a current source the potential difference arising between the silicon wafer and the platinum counter electrode immersed in an electrolyte solution. Addition of hydrogen peroxide to HF/ethanol electrolyte enables control over the current density in t…
In this paper, we analyze the consequences of Sih’s fracture criterion in a material which behaves according to the Cosserat-type model with free or constrained rotations. Both models are considered and for each of them the first and the second fracture mode is analyzed. To apply Sih’s criterion, the singular part of…
Abstract Dynamic viscoelastic properties and dynamic mechanical properties of blends of acrylate rubber (ACM), fluoroelastomer and polyacrylate plastics have been investigated with a rheometer (ARES RDA III) at a frequency (ω) range of 0.1 to 100 rad.s −1 . The analysis of thermorheological properties revealed that th…
Heyrovskyite, a rare Pb-Bi sulfosalt, was found around a fumarole of ca. 500 °C at the La Fossa crater, Vulcano Island, Italy. The mineral occurs in the thin sulfosalt-rich crust covering the brecciated altered rocks of fumaroles, mainly admixed with selenian varieties of lillianite and cannizzarite, with subordinate…
A first study of the effect of weak pulsed magnetic fields (PMFs) on Sb 1− x As x solid solution crystals is reported. An effect of long-time (months) redistribution of the solid solution components at room temperature after a short (seconds) exposure to a PMF was revealed. The effect includes stages of enrichment of…
Water‐induced degradation of barium titanate (BTO) ceramics has been investigated using electrochemical hydrogen charging, in which the silver electrodes of BTO ceramic specimens are made cathodes in a 0.01 M NaOH solution to evolve hydrogen by electrolysis of water. After 80 h of treatment, the resistance of BTO decr…
Boundary migration under an electric field was investigated for pure, TiO 2 ‐doped, and Li 2 O‐doped Al 2 O 3 specimens. Boundary migration rates in TiO 2 ‐doped and Li 2 O‐doped Al 2 O 3 specimens were much faster compared with that of pure Al 2 O 3 . In all specimens, the migration rate was observed to depend on the…
Abstract It is still not clear why the long‐term properties of plastic weld seams can only be differentiated by the very expensive medium tensile creep tests. One hypothesis for justifying this is based on the change in the structure of the weld seam surroundings, another cites the consumption of antioxidants and the…
A nondestructive method making use of X-ray computer tomography (X-ray CT) has been applied to post irradiation examination of fast breeder reactor (FBR) fuel assemblies. In the study, an examination is made of the deflection and displacement of fuel pin in a fuel assembly irradiated to 74.2GWd/t peak burnup in the fa…
A spin coating composite sol gel technique for producing lead zirconate titanate (PZT) thick films has been modified for use with screen printing techniques. The resulting screen printing technique can be used to produce 10 μm thick films in a single print. The resultant films are porous but the density can be increas…
The phenomenon of ordnance velocity impact of projectile on single and layered plates is of interest for many applications. In this paper. an experimental study of normal and oblique impacts or an ogive shaped, hard steel projectile on single and layered plates of mild steel and aluminium is presented. The projectiles…
Effects of preparation conditions on the microstructures and periodicity of the superstructure for Li1+xNb1-xTixO3 phase M polycrystals were investigated. Obtained specimens, mainly comprised of elongated plate-like grains, and their surfaces were found to be parallel to periodical domains. Sintered materials were fou…
The microstructural evolution during sintering of Al 2 O 3 was investigated to determine the role of MgO additive, particularly when its concentration is very low (<200 ppm). Compared with specimens without MgO, a few Al 2 O 3 grains were observed to grow enormously after the addition of 50 or 100 ppm MgO. When MgO…
Abstract Cytocompatible polymers are of increasing importance for tissue engineering scaffolds and implanted devices. Polyurethane (PU) membranes were modified by grafting polymerization of methacrylic acid (MAA) initiated by UV light and further covalent immobilization of gelatin or arginine‐glycine‐aspartic (RGD) pe…