Materials Literature
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New [3]- and [4]-dendralenes bearing electron-donor 1,3-dithiole and ferrocene substituents have been synthesised. Compounds 8, 15 and 17 have been characterised by single-crystal X-ray diffraction. Two of the dithiole rings of 8 are conjugated (dihedral angle 9 degrees), while the third dithiole ring is almost orthog…
Highly dipolar merocyanine dyes such as 1 form strong dimer aggregates with an antiparallel orientation of their dipole moments in solution. Substituent variations and solvent-dependent binding studies have shown that the aggregation is driven by electrostatic dipole–dipole interactions and that the dyes are prevented…
Chemical (vapors of formaldehyde), physical (temperature, UV and gamma radiation), and aging treatments were applied to wheat gluten films. Changes in film mechanical properties, water vapor permeability, solubility, and color coordinates were investigated. An aging of 360 h led to a 75 and 314% increase in tensile st…
The structure of a solid has been studied by the molecular dynamics technique upon transition from the amorphous state to the crystalline state. The influence of initial conditions in the simulation of an amorphous sample and the temperature of its heating on the resulting structure is examined. It is found that struc…
A complete spectrum criterion and a next nearest neighbor model are proposed. Research indicates: 1) Using this criterion can remove the long existing puzzle that different parameters produce different bond lengths. The criterion greatly improve the reliability of optical method for determining the Mn 2+ -F - distance…
The conformational preferences of N-[3-(acetylamino)-2-methyltrimethylene] acetamide and N-[5-(acetylamino)-(S)-2-methylpentamethylene]acetamide were investigated using ab initio computational methods. These are model compounds of a number of substituted nylons-m,n containing a methyl side group in the diamine unit. A…
Abstract In the present paper a general analytic expression has been obtained and confirmed by a computer simulation which links the surface roughness of an object under study in an emission electron microscope and it's resolution. A quantitative derivation was made for the model case when there is a step on the objec…
In this communication we present the results obtained from a study on the effect of thermal treatments of chitosan films with different molecular weights, but with a similar acetilation degree, carried out by microhardness. It was found that the hardness of films prepared from both type of chitosan is similar, of appr…
The interfacial chemistry of an Al/Mg/PET sample, prepared by thermally evaporating first Mg and then Al on to a polyethyleneterephthalate (PET) film, was studied by X-ray photoelectron spectroscopy (XPS). The Mg/PET system showed two types of Mg species, namely an O–Mg–C complex, from reaction with the carbonyl group…
Copper(II) trifluoroacetate with three coordinated water molecules and two dioxane molecules (1) crystallized as a linear chain surrounded by a net of hydrogen bonds to the dioxane and trifluoroacetate. This complex [Cu(H2O)3(OOC-CF3) 2]·2(C4H8O 2) crysta
The kinetics of the isothermal eutectoid transformation in a eutectoid Au–39 at.-%In alloy has been studied in the temperature range 393–473 K. The maximum extent of growth of the eutectoid colonies and the lamellar spacing were determined through optical and scanning electron microscopy. The analysis of the kinetic d…
The light rare earths, particularly cerium compounds, are becoming more and more important recently. The preparation method of Ce(OH)4 · xH2O through transformation between cerium compounds was investigated. The process is compared with the direct routine by reacting Ce(III) with sodium hydroxide and hydrogen peroxide…
The complex Cu(hfac)2(DMF)2 (where hfac = the anion of hexafluoropentanedione and DMF = dimethylformamide) has been prepared and its crystal structure has been determined by X-ray diffraction methods. The complex molecule locates around an inversion centre in the crystal state. Two DMF ligands coordinate to the Cu(II)…
Open circuit potentials of stainless steels increased when immersed in the Baltic Sea. The ennoblement potential was +200 mVsce in 40 to 50 days when sea water temperature was below 52°C and +300–400 mVsce within <40 days at around 102°C. Ennoblement occurred in a laboratory ecosystem at 232°C in 20 to 30 days, and at…
We have investigated the potentiometric response of ordinary pyrolytic graphite electrodes (OPG) modified with cobalt phthalocyanine (Co-Pc) for thiols (R-SH) 2-mercaptoethanol, L-cysteine and their corresponding disulfides (R-SS-R). Stable potentials are achieved after a few seconds of additions of different amounts…
Blends of polyurethane (vibrathane- 5008 Uniroyal Co., USA) and hypalon (CSM-350 Du Pont, USA) prepared by three different blending techniques, have been studied, over the entire composition range. The processability of the polyurethane rubber was improved as a result of blending with CSM. The IR spectral analysis sug…
The antioxidant activity of total flavonoid preparation from Solenostemon rotundifolius was investigated in normolipidemic and hyperlipidemic rats. Concentrations of peroxidation products namely malondialdehyde, hydroperoxides and conjugated dienes were decreased significantly in the tissues of rats administered flavo…
Pressure-time series from breathing-mode oscillation of large (centimeter scale or larger) underwater bubbles reveal much higher decay rates than can be explained using viscous, thermal, or radiative mechanisms which apply to microbubbles. It is shown that if one assumes energy transfer to shape oscillations (surface…
In order to examine the fission gas release behavior under restraint conditions, an out-of-pile high pressure annealing technique was applied to UO2 fuels irradiated to 37GWd/t in a BWR. The irradiated fuels were annealed at temperatures of 1,500–1,800°C and external pressures of 10–150MPa. The fractional release of 8…
The trapping of hydrogen by various interfaces in iron and steels has been studied. The hydrogen content of pure iron specimens was found to depend more on hydrogen than those of low angle, and thus specimens with low angle grain boundaries were less susceptible to hydrogen damage. Inclusions and thermo-mechanical tre…