Materials Literature
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The molecular anchoring and orientational wetting properties of a liquid crystal close to the nematic-isotropic transition temperature confined to the 0.2 \ensuremath{\mu}m cylindrical channels of alumina membranes are investigated for various surface preparations. The cavity walls of the confining pores are chemicall…
The dc resistivity, magnetoresistance, and magnetic susceptibility of ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{CoO}}_{3}$ compounds have been investigated in the temperature range of 4--300 K for magnetic fields up to 7 T. In the doping range studied (0.05\ensuremath{\l…
The formation processes of unfilled and filled interpenetrating polymer networks (IPNs) and some of their physico-mechanical properties have been investigated. The IPN formation kinetics and the constituent network curing rates determine the rate and degree of microphase separation. This in turn determines the boundar…
Abstract The influence of molecular weight and its distribution on the nucleation density, crystallization, thermal and mechanical behavior of isotactic polypropylene based composites has been investigated. The composites were prepared by compression molding. The ability of carbon and Kevlar fibers to nucleate the pol…
A reversible thermally induced conformational transition of the beta2 subunit of tryptophan synthase from Salmonella typhimurium has been detected by use of the pyridoxal 5'-phosphate coenzyme as a spectroscopic probe. Increasing the temperature converts the major form of pyridoxal 5'-phosphate bound to the beta2 subu…
We report x-ray photoemission spectra of poly(tetrafluoroethylene) (PTFE). XPS spectra were measured with the SSI, SSX-100 model, using monochromated Al Kα x-rays. We present the survey spectrum (binding energy range of 0–1000 eV) and narrow scans of C 1s and F 1s. The polymer is used as a reference to study the influ…
Abstract The new technique of measuring radial expansion of a crater as a function of time on a shaped charge jet that penetrates water is explained in this paper. Radial expansion of the crater in the frame of experimentation can, in this case, be easily described with a modified Bernoulli equation under the conditio…
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…