Materials Literature
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It is shown that the original Good−Girifalco derivation of an equation for cos θ (where θ is the contact angle of a liquid on a solid) based on intermolecular force (IMF) theory contains an inconsistency which leads to dependence of cos θ on the term −π e /γ L (where π e is the reduction in free energy on equilibraton…
Brass electrodeposits are used for decorative applications and for promotion of adhesion of rubber to steel and other metals. Brass coatings, because of their lubricity, are applied on rods and wires which are further subjected to drawing into thinner gauge. Brass deposits are generally obtained from cyanide electroly…
The partial crystallisation and magnetic behaviour of 43.3Fe 2 O 3 -52.7P 2 O 5 -4.ONa 2 O wt% glass made into frit, fibres and beads have been investigated before and after heat treatment. The Mossbauer spectra indicated that 90% of the iron was present as iron (III) in the glass frit and fibres while the glass beads…
Tin dioxide thin films doped with fluorine were prepared by using a radio‐frequency (RF) magnetron sputtering method. The target was SnO 2 powder mixed with either SnF 2 or SnF 4 powder. The deposition conditions for obtaining films of low resistivity and their physical characteristics were systematically studied. The…
Metal matrix composites based on a sintered M3/2 high speed steel (HSS) and containing either single additions of TiC, NbC, or MnS particles or combined additions of MnS + TiC or MnS + NbC were sintered to full density and subjected to a conventional hardening heat treatment cycle of austenitisation, quenching, and do…
Poly(hexamethylene-2,3-di- O -methyl- d, l -tartaramide)s [P6DM(D,L)T], with enantiomeric d / l ratios ranging from 1:9 to 1:1 and weight average molecular weights up to ∼80 000, were obtained by the active ester polycondensation method. The microstructure of these stereocopolyamides was investigated by 1 H and 13 C N…
Raman longitudinal acoustic mode (LAM) spectra have been obtained during isothermal crystallization from the melt at various temperatures of a poly(ethylene oxide) (PEO) fraction of molecular weight about 3000. At all temperatures, we find an initial single well-defined LAM band corresponding to a helical chain length…
We have examined chain ends in ethylene−propylene (EP) copolymers following high-temperature shearing in an extruder. New chemical structures, not present prior to shearing, corresponding to vinyl, vinylidene, and vinylene chain ends were observed via 1 H and 13 C NMR and FTIR spectroscopy. A compilation of the variou…
Abstract A fluidized bed crystallizer is employed to investigate the effect of pH of the solution on the growth and dissolution rates of potassium chloride crystals. The growth rate shows a minimum value at the pH range between 7 and 10, whereas the dissolution rate shows a minimum at the range between 7 and 9. It is…
Hexagonal boron nitride powder was hot pressed in an environment of metallic copper. When compared with a copper‐free system, the sintered body exposed to the copper was composed of substantially thicker grains having an unusual arrangement, consisting of preferred alignment of (0001) basal planes parallel to the pres…
In a combined experimental and theoretical ab initio study, the reaction of AgOCN with Br2 was investigated. The formation of diisooxocyan, OCN−NCO (2), as a likely intermediate is discussed on the basis of experimentally observed decomposition products and on the grounds of energetic considerations. No evidence for t…
Anodic steady state polarization and potentiodynamic polarization studies were carried out for nitrogen-bearing austenitic stainless steels in 0.6 kmol·m–3 NaCl solution at room temperature. The pitting potential measurement indicated that the pitting resistance increased with increase in nitrogen addition. In-situ di…
The dehydration-rehydration of Mg-vermiculite, as large flakes (7 × 5 × 0.1 mm3) and powder (⩽ 80 µm), has been studied. Samples were treated in a sealed bomb at 140 and 100 °C for several days. After dehydration, they were rehydrated at room temperature. The samples were examined by X-ray diffraction, and the results…
Lanthanide(III) and yttrium(III) complexes of the 20-membered hexaaza Schiff-base macrocycle 6,20-dimethyl-2,10,16,24,29,31-hexaazapentacyclo[23.3.1.14,8.111,15.118,22]dotriaconta-1(29),2,4,6,8(30),9,11,13,15(31),16,18,20,22(32),23,25,27-hexadecaene-30,32-diol (H2L3) have been synthesised by metal-template condensatio…
Abstract Reduction of CO2 with H2O was carried out by microwave plasma for the formation of methanol. The results of steam chromatography and mass spectrometry showed that the plasma products contained methanol. The methanol formation was also found in H2O-plasma-cleaning process, in which materials which had been dep…
Mg–10 mass%Gd–3 mass%Nd–Zr alloy and Mg–10 mass%Dy–3 mass%Nd–Zr alloy have high strength at elevated temperatures and their application to automotive engine parts is expected. In this paper, the corrosion propeties of these alloys in salt solution are discussed. The corrosion properties are evaluated by immersion test…
Reaction of [Ru(ttp)(NO)Cl] with aryl or alkyl Grignard reagents gives [Ru(ttp)(NO)R](R = C6H4F-p, Me); the Ru–C bond in [Ru(ttp)(NO)Me] undergoes insertion by SO2, and the structure of [Ru(ttp)(NO)(C6H4F-p)] is determined by X-ray crystallography.
Abstract � Electromigration induced degradation in integrated circuits has been accelerated bycontinuous scaling of device dimensions. We present a method� ology for synthesizing high�reliability and low�energy microarchitectures at the RT level by judiciously bind� ing and scheduling the data transfers of a control d…
Clays modified with paramagnetic ions have been shown to be effective magnetic resonance imaging contrast agents. The efficacy in part relies on the suspension of the small clay particles in aqueous solution. In this study a series of macromolecules were evaluated as suspending agents for Gd(III) ion exchanged hectori…
The 57Fe Mössbauer spectrum of semiconducting xK2O·(90–x)V2O5· 10Fe2O3 glasses (20⩽x⩽30) consists of a quadrupole doublet peak. The linewidth and the quadrupole splitting decreased gradually after heat treatment at the crystallization temperature, reflecting an increased uniformity of Fe–O bonds and a decreased distor…