Materials Literature
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Thermal degradation of PET was studied in a nitrogen atmosphere at 200–700°C. The experiments were carried out in a tubular furnace under isothermal conditions. The volatile substances evolved from PET were identified and quantified. Weight losses of PET during the thermal degradation in different temperatures were de…
Abstract We present in this paper the use of silica-coating for nanostructuring metal and semiconductor nanoparticles. The basic concept is the strict tailoring of the interparticle spacing through the thickness of the silica shell. Three different experiments are presented that exemplify this concept. The first examp…
The properties of bone tissue with very high or very low mineral levels attract attention because they allow researchers to comprehend more fully the mechanics, interaction and effects of mineral on collagen through a greater range of compositions than that found in the "ordinary". The bone tissue of the rostrum of th…
The M(bipy)32+ cations in the isomorphous structures of [M(bipy)3][M′(dca)3]2, [dca = dicyanamide, N(CN)2−; M = Fe, M′ = Mn 1, Fe 2 or M = Ni, M′ = Mn 3] are contained within hexagonal windows of anionic 2D (6,3) M(dca)3− sheets; weak antiferromagnetic coupling is observed between metal centres within the anionic netw…
Chemical inhomogeneities (inclusions) present in the alloy are known to affect the stability of the passive film on stainless steels in the presence of chloride ions. In this work, three surface analytical techniques— XPS, AES and time-of-flight SIMS (ToF-SIMS)— have been used to characterize the surface films formed…
The analogy between carbon nanotubes and synthetic imogolite, an aluminosicate of stoichiometry (OH)3Al2O3SiOH, having a tubular structure of external diameter 2.4 nm and internal diameter 0.9 nm, is examined. High-resolution transmission electron microscopy, image matching and electron diffraction are used to examine…
The effects of storage at 25°C in swelling solvents having different solubility parameter (δs) values of 16.8–26.0 J0.5 cm−1.5 on the physical properties and structure of as-cast poly(L -lactide) (PLLA) films was investigated by the degree of swelling (DS), differential scanning calorimetry (DSC), and tensile tests. I…
Temperature measurements are carried out in 99.99 wt% aluminium and aluminium–silicon alloys. The experimental apparatus was initially built for the study of microporosity formation in aluminium alloys.1) The construction is designed to obtain upward directional solidification by limiting lateral heat flow during cool…
We report on a comparative study of the transport properties of lightly La-doped layered CaO $({\mathrm{CaMnO}}_{3}{)}_{m}$ $(m=1,2,$ and $\ensuremath{\infty})$ and similar ${\mathrm{Mn}}^{3+}{/\mathrm{M}\mathrm{n}}^{4+}$ ratios. In contrast to the large and rather nonsystematic variations of the resistivity $\ensurem…
Passive layers on cobalt were prepared under potentiostatic control in borate buffer pH 9.3 and examined with x-ray photoelectron spectroscopy (XPS). The electrochemical preparation of the sputter-cleaned samples and their transfer to the ultrahigh vacuum was performed in a closed system under protection of purified a…
Interaction parameter, A, proposed in Yamashita-Kurosawa's theory of dielectric constant, has been calculated for numerous binary oxide glasses on the basis of polarizability of oxide ion determined from refractive index. It has been established that the interaction parameter is closely related to the oxide ion polari…
The subnitride Ca2N has been prepared via several synthetic routes described for the first time, including reduction of Ca3N2 and reaction of Ca metal dissolved in liquid sodium with nitrogen gas. Products have been characterised by powder X-ray and powder neutron diffraction. Crystallite morphology and compound stoic…
Highly ordered hexagonal silica/block copolymer mesostructured composites have been prepared using syntheses with fluoride over a wide range of pH conditions (pH 0–9), by controlling the rates of hydrolysis and condensation of the tetramethoxysilane silica source.
Liquefaction of the bark of Acacia mearnsii (BK) and cornstarch (CS) was conducted by using a solvent mixture consisting of poly(propylene glycol) (PPG), glycerol, and sulfuric acid with a weight fraction of 94/5/1 at 150°C. Solubilities of BK and CS were about 80% after 60 min and 100% after 20 min in the same solven…
Nucleation and growth mechanism of polypyrrole films was investigated on vapor deposited gold/highly oriented pyrolytic graphite by current‐time transient ( i‐t ) measurements and atomic force microscopy. It was found that the nucleation and growth was an instantaneous two‐dimensional process before nuclei overlapping…
A porphyrin-capped molecular clip epoxidises olefins, depending on the axial ligand used, with enhanced activity or stability
We have studied the effect of magnetostatic interactions on the overall shape of hysteresis loops for arrays of single domain particles. A computational model was used to calculate major hysteresis loops of arrays of particles with an easy axis along the applied field. The shear of the hysteresis loop, and consequent…
Thin films of MgO were deposited by atomic layer epitaxy (ALE) from bis(cyclopentadienyl)magnesium and water using soda lime glass and Si(100) as substrates. Deposition parameters were studied in the temperature range of 100–400 °C. A plateau of surface-controlled growth was observed at 200–300 °C with a growth rate o…
Mechanical and dynamic mechanical properties of a waste rubber powder-filled high-density polyethylene (HDPE) composite are investigated. Rubber powder is surface-modified with acrylamide (AAm) using ultraviolet. Rubber powder and HDPE are extruded using a single-screw extruder and maleic anhydride-grafted polypropyle…
As far as the flame-retardant polyester fibers are concerned, the copolymerization of phosphorus retardants is the most common method. But a serious problem is that the phosphorus-containing polymer is easily hydrolyzed. We investigated the flame retardancy and the hydrolysis properties of two poly(ethylene terephthal…