Materials Literature
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Abstract The intercalation of a saponite with the Al polycation [Al 13 (OH) 24 (H 2 O) 24 ] 15+ is described. This polycation is obtained by reaction of alumina with Al chloride. The intercalation is achieved by reaction of very concentrated solutions of this polycation with the clay in powder form. Solids with a basa…
Propagation of ultrasonic signals induced by nanosecond laser pulses in porous silicon ( por -Si) is considered from both the theoretical and the experimental viewpoints. The experimental samples are por -Si layers with 5-to 40-µm thickness and porosity of 50–75%; these layers were formed on a single-crystal silicon s…
A Sr-exchanged heulandite crystal of composition Sr 4.35 Ca 0.13 (Al 8.96 Si 27.04 O 72 )·26H 2 O was used for stepwise dehydration experiments. The crystal was heated for approximately 12 h from room temperature to 250 °C in steps of 50 °C using an airflow-heater device. For single-crystal X-ray data collection the c…
Single crystals of the nitridosilicate Ca 0.27 La 0.03 Si 11.38 Al 0.62 N 16 with a filled α‐Si 3 N 4 ‐type structure were obtained when preparing lanthanum nitridosilicates in a graphite furnace accidentally containing calcium residues. The lithium α‐SiAlON LiSi 9 Al 3 O 2 N 14 was prepared using spark plasma sinteri…
Abstract New copolyether sulfones having copper(II) chelate units as pendant groups were synthesized by a chemical modification reaction of chloromethylated polysulfones with the sodium salt of copper(II) bis(2,4‐dihydroxybenzaldehyde) in dichloromethane/dimethyl sulfoxide as solvent system, at room temperature. The r…
Abstract In monotectic systems, there are thermodynamic restrictions on compositions and temperatures below the monotectic where the equilibrium solid cannot form directly from the undercooled homogeneous liquid. In this region, the solid can form only after liquid–liquid phase separation has occurred. As suggested by…
The mechanical response in compression of several explosives was determined as a function of temperature and strain rate. The compressive strength (maximum stress) and the Young's modulus increase with decreasing temperature and increasing strain rate and are proportional to each other. While the compressive strength…
Abstract The appearance of Metal Matrix Composites has opened a new area in structural design. The possibility of tailoring mechanical properties of structural metals reinforced with particles or fibers into specific spacecraft applications is very appealing. This paper deals with such a MMC, which is based on a magne…
Some visual characteristics of wood such as color, pattern and texture determine the quality of manufactured products. Surface properties of wood material are important both in production and marketing after production. Initial studies related to the roughness of wood surface were begun in early 1950’s. However, no ge…
Specimens prepared from Calabrian pine (Pinus brutia Ten.) wood were treated with borate-supplemented aqueous solutions of Calabrian pine bark powder, acorn powder, sumach leaf powder and gall-nut powder. Then, fire test methods containing flame source, without flame source and glowing stages was performed according t…
Abstract Surface area of precipitated calcium carbonate was modified by using difuncional compounds f.e.: hydroxyacids, aminoacids, unsaturated acids, their derivatives and silanes. We observed the influence of the degree of surface coverage ratio of calcium carbonate on the properties of modified filler, particularly…
The effects of DC and AC electric fields on frost formation on a horizontal downward-facing flat plate was investigated in the present experimental study. Frost growth was influenced and controlled by electric fields generated by an insulated wire electrode. In order to quantify the effects of DC and AC electric field…
The background and evolution of absorbent disposable hygiene products is discussed. The current technology used to produce disposable hygiene products such as baby diapers, feminine hygiene products and adult incontinence management products is shown to have a number of manufacturing and in-use problems. Alternative t…
New kinds of cellulose derivatives have been obtained by modification of sodium and lithium carboxymethylcellulose (NaCMC and LiCMC, respectively) with commercial octadecylisocyanate (OctI) and hexamethylene-diisocyanate (HDI). The CMC samples were obtained from sugar cane bagasse pulps using sodium hydroxide and anth…
Linear orientational defects (2π and π walls) in freely suspended thin smectic C films exposed to a magnetic field were studied. The bend and splay elastic constants, as well as the orientational viscosity of a two-dimensional c -director field, were determined. It was established that a change in the polar and azimut…
Abstract The results of an investigation of the influence of thermal annealing on the magnetoelastic properties of Fe 73.5 Nb 3 Cu 1 Si 13.5 B 9 soft magnetic alloy in both amorphous and nanocrystalline state are presented. A new method developed was used to apply uniform compressive stresses to the investigated ring…
Experiments were performed, wherein cylindrical projectiles made of hardened steel were impacted on commercially available aluminium plates at different angles. Projectiles were of 12.8 mm diameter and plates were of 0.81 mm, 1.52mm and 1.91mm thicknesses. Based on the experimental results, an analytical model has bee…
We show that the contribution to the fine structure of the ground exciton level in a semiconductor nanocrystal due to the long-range part of the electron-hole exchange interaction can be equivalently described as arising from the mechanical exciton interaction with the exciton-induced macroscopic longitudinal electric…
This paper reports on the work undertaken to determine the effect of the gas type on the high repetition rate performance of a triggered corona stabilised (TCS) closing switch at a charging voltage of 23 kV. The voltage/pressure (V/p) characteristics as well as the ability of the switch to operate at high repetition r…
Abstract The aggregation tendency of 11 different CaCO 3 fillers with widely differing particle sizes was studied in polypropylene (PP) composites. The fillers were characterized by different techniques in powder form and in suspension. Homogenization and sample preparation were carried out by extrusion and injection…