Materials Literature
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The kinetics of crystallization limit the rate in which crystal growth can occur without in-corporation of undesired impurity. If the rate of heat transfer exceeds the mass transfer rate of the inpurity, the impurity can solidify, contaminating the product. One would like to specify a rate of crystallization and deter…
Thermodynamical, optical-texture and dielectric studies have been performed to study the phase diagram of the binary system of 5-cholesten-3β-ol-octanoate and 4-n-nonyloxybenzoic acid. It is observed that low concentrations of 5-cholesten-3β-ol-octanoate (2–30 mol %) in 4-n-nonyloxybenzoic acid induce a mean-field pha…
An AISI 430 (UNS S43000) stainless steel sheet was cold-rolled and then annealed at 1,073 K, to derive three different grain sizes. Through Devanathan hydrogen permeation tests at 303 K and a mathematical analysis for diffusion in laminate structures, the grain boundary diffusion coefficient (Dg = 1.14 × 10−15 cm2/s)…
The products from the reaction of octahydrosilsesquioxane (T 8 -H) with different molar ratios of phenol and undec-1-ene or methyl 3,3-dimethylpent-4-enoate (MDP) in the presence of chloroplatinic acid have been analysed by 29 Si NMR spectroscopy. The distribution of the two different pendant groups leads to tetrad pa…
The paper presents a numerical model of image transfer in screen-printing that is supported by experimental data. The model focuses on a roller squeegee system. It combines thin film hydrodynamic behaviour with roller squeegee deformation and flow through a porous screen. The work within this investigation has, for th…
Abstract The rubber from commercially obtained high-ammonia latex (commercial HA-latex) increased in gel content significantly after long preservation of the latex with 1.0% w/v tetramethylthiuram disulfide (TMTD) and zinc oxide (ZnO). Deproteinization of the HA-latex did not decrease the gel content. The gel fraction…
Abstract A substituted porphyrinatoplatinum(II), meso-tetrakis(4-t-butylphenyl)porphyrinatoplatinum(II), has been spectroscopically and structurally characterized. The 1H NMR signal from the β-protons of the pyrrole ring is observed as a singlet with a full-width at half maximum of 1.6 Hz, contrary to the reported qua…
A method of studying the quenching of luminescence of cyclometalated ethylenediamine complexes of Pt(II) by molecular oxygen is developed. The bimolecular rate constants of quenching are determined.
An intercrosslinked network of varying percentage of vinyl ester oligomer (VEO) modified unsaturated polyester matrices has been developed. Vinyl ester oligomer was prepared by reacting commercially available epoxy resins GY 250 (Ciba-Geigy) and acrylic acid and was used as toughening agent for unsaturated polyester (…
Crystals of NaBaBO 3 were grown by spontaneous crystallization on a platinum loop from the BaO-B 2 O 3 -Na 2 O system using the flux technique. The crystals have a highly disordered block structure. X-ray diffraction study λMo K α, 518 independent reflections, R = 0.0272) demonstrated that the structure of these cryst…
Coagulation-flocculation of the colloids particles present in the cuttlefish effluents was investigated using a coagulation step with aluminium sulphate (SA), followed by a flocculation step with starch, SiO2 or MgO and then poly dimethyl ammonium chloride (PDMAC), in order to reduce the turbidity and chemical oxygen…
Variable polarization compensation has been demonstrated at 100 GHz. The device consists of two interlocking V-groove artificial dielectric gratings that produce a birefringence that varies with the separation distance. A maximum retardance of 74/spl deg/ has been obtained experimentally in a silicon device, in good a…
Abstract A series of ceramer coatings were formulated using blown soybean oil as the organic phase, and sol‐gel precursors [titanium( IV ) isopropoxide, titanium( IV ) diisopropoxide bisacetoacetonate, and zirconium propoxide] as the inorganic phase. The corrosion resistance of the ceramer coatings was evaluated using…
The effect of functionalization of random styrene-butadiene copolymers (SBR) and type of functional group on the interaction with fillers like carbon black and silica was analysed. The SBR were functionalized using tin (R3SnCl) and organosilane (RSi(OR′)3) compounds. The polymers, functionalized and non-functionalized…
In this paper, a theoretical investigation on the deformation of a spherical bubble embedded in soft solid media under externally applied pressure is presented. The effects that surface tension and mechanical properties have on interactions between the bubble compressibility and the surrounding medium are quantified.…
The crystallization of isotactic polypropylene was studied by DSC method at a standard cooling rate of 10 deg/min. The samples were in the forms of sandwiches comprising polymer films of various thickness and layers of foreign materials. After the crystallization the spherulitic structure of the samples was investigat…
Calderonite, ideally Pb 2 Fe 3+ (VO 4 ) 2 (OH), a new member of the brackebuschite group, has been found in the upper oxidation zone of two Pb-Zn hydrothermal deposits located at Santa Marta and Azuaga, Badajoz province, Spain. Brackebuschite and calderonite probably form a complete solid solution, locally with import…
Ultrafine-grained titanium produced by equal channel angular pressing and subsequent cold rolling is studied by Xray diffraction. It is found that a texture exists in which the hexagonal basal planes are parallel to the longitudinal axis of the billet. The crystallite size distribution and the dislocation structure ar…
Abstract Measurements have been made of the degradation rates for poly(vinyl chloride) (PVC) and nitrocellulose with cellulose acetate (NC) in x‐ray photoelectron spectroscopy. These materials form part of earlier studies published by others to evaluate instrumental degradation factors. In the earlier studies, results…
A comparison analysis has been undertaken to study the effect of different wood fillers on density and mechanical properties of two different types of commercial polyurethane (PUR) foams: low-density flexible foams and high-density rigid foams. The micro-fillers used were based on wood flour particles of size 70-250 m…