Materials Literature
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The microstructure of a cross-woven CSiC composite and its effect on tensile behavior was studied in terms of damage and damage development. Microstructure characterization revealed that the composite contained processing-induced cracks and nonuniform fiber bundle sections with different fiber-matrix distributions. T…
A molecular dynamics system of a two dimensional immiscible binary mixture with a first order chemical reaction that changes a particle from one of the species to the other, is set up, in close analogy to the Monte Carlo investigation of a similar system on a square lattice by S. Glotzer et al. [Phys. Rev. Lett. 72, 4…
The effect of ethanol on the foaming properties of beer protein fractions was studied using a microconductivity method and nitrogen gas to generate the foam. Increasing the ethanol concentration resulted in a decrease in foam stability. Interfacial studies including thin film drainage and dilational elasticity measure…
Self-diffusion and relative diffusion of hard spheres are measured in free-standing soap films using video imaging. We found the following: (1) Particle self-diffusion in the film is faster than in the three-dimensional fluid, in quantitative agreement with Saffman's calculation for diffusion in a thin sheet of fluid.…
Three different types of biocides, viz. formaldehyde (FM), glutaraldehyde (GA) and isothiozolone (ITZ) were used to control planktonic and sessile populations of two marine isolates of sulphate‐reducing bacteria (SRB). The influence of these biocides on the initial attachment of cells to mild steel surfaces, on subseq…
Abstract The results of ab initio calculations for the sulfur‐bridged copper clusters [Cu 2 n S n (PR 3 ) m ] ( n = 1–4, 6; m = 0, 2, 4, 6, 8; RH, CH 3 ) were compared with those of theoretical investigations of the selenium‐containing analogues that have been recently reported. The theoretical work was carried out i…
The chloride-induced stress corrosion cracking (SCC) resistance of nitrogen-alloyed, powder metallurgically (P/M) produced and hot isostatically pressed (HIP) duplex stainless steels (DSS) was investigated and compared to the SCC resistance of two commercial wrought (forged) DSS. Constant-strain (deflection) SCC tests…
We demonstrate a potentially useful method of generating an SiO2 morphology, in situ, with interpenetrating polymer networks (IPN) chemistry. Organic/inorganic IPNs were synthesized with an organic phase made of epoxy resin and an SiO2 phase made by sol—gel chemistry. The two types of polymerization used were sequenti…
Metallic vanadium powder was dissolved in a hydrogen peroxide solution, yielding a hydrosol based on a polyvanadate. A polycrystalline thin film of VO 2 was fabricated on a fused silica substrate by spin-coating using this hydrosol followed by reduction in hydrogen and additional post-annealing in a nitrogen atmospher…
Abstract The polyiminophosphazene bases Et‐P 2 and t ‐Bu‐P 4 were used as a promoter for ethylene oxide and siloxane polymerizations. Initiation by an alcohol in combination with t ‐Bu‐P 4 lead to an extremely rapid polymerization reaction of octamethylcyclotetrasiloxane. In the case of ethylene oxide, well‐defined po…
In this study, we describe a distinct nematic liquid crystal with polar ordering which is formed from the polar rod-like aromatic copolyester comprising 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid. The polarity in the nematic phase appears along the nematic director as determined by second-harmonic generation…
The martensitic β1→ β′1 transformation in Ni2MnGa Heusler alloy and B2 → R transformations in two Ti‒Ni‒Fe alloys have been studied and the latent heats of these transformations measured. The shifts of martensitic transformation temperatures under the action of applied hydrostatic pressure have been determined. The ex…
Abstract For the calculation and the drawing of Dirichlet domains and coordination polyhedra in crystal structures or point sets two programs – DIDO95 and VOID95 – have been derived. A third program – DEMODIDO – shows how the Dirichlet domain of a point changes if the metrical parameters or the coordinates vary along…
The crystal structure of lead tetraborate, PbO.2B 2 O 3 , has been refined using single-crystal X-ray diffraction data (Mo K α radiation, λ = 0.71069 Å). Crystal data at room temperature: M r = 362.43, orthorhombic, P 2 1 nm ( C 7 2 v ), a = 4.251 (2), b = 4.463 (3), c = 10.860 (3) Å, V = 206.04 Å 3 with Z = 2, μ = 40…
Assignment of the peaks near 485 em-I in vibrational spectra ofSi02-M7;:;Al02(where M = an alkali or alkaline earth element) glasses to v,(T-O-T) modes in four-membered rings was tested with molecular orbital calculations. Potential energy minima of cyclic (HsSimAln012)n- (where m + n = 4), Li2HsSi2A12012, Mg2HsA14012…
Dielectric and rheological measurements are reported on the effect of cure temperature on the water absorption of tris[(2,3-epoxypropoxy)phenyl] methane cured with a 1 : 1 stoichiometric ratio of 4,4′-diaminodiphenylsulphone. Analysis of the water absorption characteristics of these materials using a combination of di…
The Rodrigues parameterization of rotations offers an intuitively simple space which enables visualization of the geometric configuration of orientations and misorientations. Recent efforts have concentrated on promoting the use of Rodrigues vectors for orientation parameterization. In the present work a procedure for…
The transport behavior of aromatic hydrocarbons in crosslinked nitrile rubber (NBR) membranes has been studied in the temperature interval of 28°–70°C. NBR was cured by different vulcanizing techniques, viz., efficient, conventional, peroxide, and mixed. The peroxide system showed the lowest solvent uptake; and the co…
Abstract Copolymerization of γ‐butyrolactone (γBL) with ε‐caprolactone (εCL) initiated with aluminium isopropoxide trimer ([Al(O i Pr) 3 ] 3 , (A 3 )) is described. Copolymers with molecular weights ( M n ) up to 3 · 10 4 and containing up to 43 mol‐% repeating units derived from γBL are prepared. Their molecular weig…
Electrochemical oscillations at silicon electrodes anodized in hydrofluoric acid are a well known but poorly understood phenomena. It is less well known that potential oscillations are also observable during anodic oxidation in fluoride‐free electrolytes. In situ measurements of stress, as well as x‐ray reflectometry,…