Materials Literature
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The corrosion of electrogalvanized steel exposed to 0.1M NaCl was studied using the SVET. Situations of localized corrosion, cathodic protection and corrosion protection due to surface pre-treatment were analyzed, putting in evidence the possibilities of the technique.
The complexes [Bi{Se2CN(C2H5)2}3], [Bi{Se2CN(C4H9)2}3], [Bi{Se2CN(CH3)(C4H9)}3] and [Bi{Se2CN(CH3)(C6H13)}3] have been synthesized and characterized structurally using IR, 1H and 13C NMR. In addition, the crystal structure of [Bi{Se2CN(C4H9)2}3] was determined by single-crystal X-ray diffraction, showing the bismuth c…
This is the third part in our current series of research papers featuring structure-property relationships in natural cellulosic fibres focussing on flax fibre. The capacity of fibres to remove different types of oil from sea water and oil baths has been related to the chemical composition and surface properties of th…
The formation of phosphates of the lighter lanthanides (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb and Dy) by reaction with alkali metal phosphates has been studied in a LiCl–KCl eutectic melt between 450 and 650 °C and in a NaCl–KCl equimolar melt at 750 °C and under an inert atmosphere. Alkali metal ortho-, meta- and pyrop…
The use of discotic nematic liquid crystals instead of calamitic nematic liquid crystals to improve the viewing angle of a liquid crystal display device has recently been reported. Compared to the large number of calamitic molecules showing nematic phase at room temperature, the number of disk-shaped molecules showing…
Quantitative structural analysis by conventional X-ray diffraction and anomalous X-ray scattering coupled with the reverse Monte-Carlo simulation technique has been carried out, in order to characterize the atomicscale structure of rust formed on the surface of Fe, Fe-2 %Cr, Fe-3 %Ni and Fe-1.6 %Cu alloys and a weathe…
Electronic properties of the passive film formed on nominally smooth Zn electrodes in aqueous KOH solutions were investigated using in situ Raman spectroscopy. Measurements performed in 1 M KOH, in which the potential, E , of Zn electrodes was stepped from E = − 1.6 V (fully reduced state) into the passive region, i.e…
Abstract. In2O3:Sn (ITO) transparent conducting coatings of high optical quality have been obtained on glass and several plastic substrates by spin and dip coating processes followed by a low temperature processing (T < 130◦C). The sols are made of crystalline nanoparticles redispersable in an alcohol and modif…
Aliphatic derivatives of hydrazinophyrin, a new type of tetrapyrrolic macrocycle prepared by the condensation of 2,5-diformylpyrroles with hydrazine, exhibit liquid crystalline properties as judged from polarising optical microscopy; these hydrazinophyrins appear to be the first mesogens derived from an expanded porph…
Fine-grained WZ73 magnesium alloy with the grain size of 1.6 μm was produced by Equal-Channel-Angular Extrusion. The material exhibited tensile yield strength of 293 MPa, tensile strength of 350 MPa and relatively large elongation of 18% at room temperature. The yield strength was almost unchanged up to 473 K. In addi…
Reaction of [Cu(MeCN)4](BF4) with N,N',N"-trimethyl-1,3,5-triazacyclohexane in CH2Cl2 leads to two Cu6 clusters containing the triazacyclohexane as a ligand to triangular Cu3 units with the abstraction and incorporation of chloride and hydride.
New processes for the preparation of nanostructure on glass surfaces have been developed through anodic oxidation of sputtered aluminum. Aluminum thin film sputtered on a tin doped indium oxide (ITO) thin film on a glass surface was converted into alumina by anodic oxidation. The anodic alumina gave nanometer size por…
Results of electric permittivity measurement for PbFe 1/2 Nb 1/2 O 3 (PFN) single crystal and for both undoped and doped with lithium ceramic samples of PFN are presented. Marked influence of the type of electrical conductance on values and on the shape of the dependence of permittivity versus temperature. The dielect…
Silica hybrids of functionalised polysiloxanes of well-defined structures, having various topologies (linear, comb-branched and dendritic-branched) and various densities of functional groups, were prepared. These hybrids were generated by the grafting of the polysiloxane to the prefunctionalised surface of porous sili…
Two series of experiments were performed to study the experimental conditions for the formation of {111} twins and related microstructures in barium strontium titanate ((Ba, Sr)TiO 3 ). In the first series, the phase equilibria in the BaTiO 3 –SrTiO 3 –TiO 2 system were determined. XRD and WDS analysis, done in the Ba…
Abstract The kinetics of the reaction of O 3 with the aromatic vicinal diols 1,2‐benzenediol, 3‐methyl‐1,2‐benzenediol, and 4‐methyl‐1,2‐benzenediol have been investigated using a relative rate technique. The rate coefficients were determined in a 1080‐L smog chamber at 298 K and 1 atm total pressure of synthetic air…
Liquid crystalline, thermoptical and glass-forming properties of a series of novel supramolecular hydrogen bonded cholesteric mesogens have been described. These assemblies were built via intermolecular hydrogen bonding between cholesteric esters containing pyridine groups and cholesterol containing carboxylic acid mo…
The oxidation behavior of high-speed steel (HSS), which is used as the work rolls in hot strip mills, was examined under both wet and dry oxidation conditions. In a dry atmosphere, carbides as well as the martensite matrix were oxidized, while only the matrix was oxidized in the wet atmosphere. After dry oxidation, th…
We present some models of Cahn‐Hilliard equations based on a microforce balance proposed by M. Gurtin. We then study the existence and uniqueness of solutions.
A new layered ammonium manganese(II) diphosphate, (NH4)2[Mn3(P2O7)2(H2O)2], has been synthesised under solvothermal conditions at 433 K in ethylene glycol and the structure determined at 293 K using single-crystal X-ray diffraction data (Mr = 584.82, monoclinic, space group P21/a, a = 9.4610(8), b = 8.3565(7), c = 9.4…