Materials Literature
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BACKGROUND: Collagens have the well-known ability to spontaneously self-associate to form fibrils at physiological temperature and neutral pH in vitro and in vivo. Because solar UV may photochemically alter collagen, the kinetics of fibril formation may be modified. Thus, we have begun a systematic study of the effect…
The glass transition of glucose, fructose, lactose, maltose and sucrose solutions at maximum cryo‐concentration was studied by Dynamic Mechanical Thermal Analysis (DMTA), using the disc bending technique. The glass transition temperatures were determined from the peaks in the loss modulus E ′′, which corresponds theor…
The results of a study on the thermal shock behavior of a high‐temperature refractory ceramic that is used as a furnace liner in the melting of steels are presented in this paper. The experimental studies show that thermal shock damage initiates by edge cracking after the first shock cycle. Subsequent subcritical crac…
The presence of sulphate, bicarbonate and orthophosphate can change the type of solid present in systems containing cupric ion or cupric hydroxide solids. In some cases, a short-term reduction in copper solubility is realized, but over longer periods of time formation of basic cupric sulphate (brochantite) and even cu…
Attempts to immobilize a series of Dawson type heteropolyanions (HPAs) by anodization and the use of polymeric, polyvinylpyridine (PVP), and conducting pyrrole and N-methylpyrrole, films has been undertaken. A stable film of the Dawson Parent, [P2W18O62]6–, HPA was obtained on an anodized carbon electrode, the film ex…
Shows the necessity of developing powerful 3D CAD‐systems for the textile and clothing industry. The connection between 2D and 3D CAD‐systems enables the user to prepare a collection more quickly and accurately. Applications could be the drape behaviour of the fabric, the deformational behaviour of fabrics when coveri…
Abstract Thermosetting phenolic resins, bearing varying extents of propargyl ether groups (PN resins), have been synthesized by the Williamson reaction of a novolac with propargyl bromide and the products characterized. The resin precursors were cured through Claisen rearrangement of the propargyl ether groups and the…
Abstract With the first version of the IDC IDC is the acronym for the International Data Centre, IMS for the International Monitoring System and CTBT for the Comprehensive Nuclear-Test-Ban Treaty. software all known radionuclides, less the natural ones and one “naturalised” man-made one, caused a spectrum measured in…
Abstract Woodallite is a new Cr-rich member of the hydrotalcite group from the large, low-grade Mount Keith nickel deposit, in the northeastern Goldfields district of Western Australia. Woodallite occurs as whorls and clusters of minute platelets up to 6 mm across in lizardite+brucite-altered dunite. Individual platel…
Morphology and electrical conductivity of polymer blends based on polypropylene, polyethylene, polyoxymethylene, polyamide 12, co-polymer ABS filled with carbon black (CB) were studied. When filler is introduced in polymer blend, three cases of filler spatial distribution can be obtained. CB can be distributed randoml…
This work is devoted to the theoretical understanding of the microstructure and thermal conductivity relationships of compacted ceramic powders in the initial, nondensifying stage of sintering. A model based on surface diffusion of vacancies for the growth of the neck between particles is combined with numerical fully…
Supramolecular polymers, which are non-covalently bonded and formed by self association of di or trifunctional monomers exhibit, by virtue of quadruple hydrogen bonds, many of the properties of normal high molecular weight polymers, e.g. a dynamic rubber plateau. We focus on the molecular and cooperative dynamics of s…
Silk samples, treated in an appositely set-up radio frequency SF6 plasma reactor under different operation conditions, were characterized by XPS, EPR, DSC, XRD, ATR analyses and water contact angle measurements, also as a function of storage time after the treatment. Efficient attachment of fluorine atoms on the polym…
The complexity of nonlinear models for simulating the dynamic behavior of arc furnaces is well known. For this reason, previous works are based on time domain solutions. In this paper, a new frequency domain approach for obtaining harmonics, interharmonics, and unbalances of arc furnaces is proposed. The model assumes…
Hardness and polarizability are associated with easily discernible atomic shell structures across the periodic table. In a given period the noble gas atom is the hardest and the least polarizable, as expected from its exceptional stability vis-a-vis the principles of maximum hardness and minimum polarizability. The el…
Eine Alternative zu Porphyrinsystemen bieten Corrol-Liganden. Die Mangancorrole 1–4 beispielsweise sind leicht zugänglich, Redoxreaktionen finden bei ihnen am Metallzentrum (nicht am Liganden) statt, und insbesondere 4 zeigt beeindruckende katalytische Aktivität bei der Epoxidierung von Styrol mit Iodosylbenzol.
Abstract New and better mixing criteria are needed to assess dispersive and distributive mixing efficiency in polymer processing equipment. Such criteria can serve the purpose of process optimization and machine scale‐up. In this work, the history of flow strength and shear stresses experienced by a number of particle…
Agglomeration of noble metal particles has been a long-standing obstacle in the preparation of planar, finely dispersed, metal cluster−oxide support model catalyst systems. A solution deposition method was devised. Six-atom gold clusters, in the form of [Au 6 (PPh 3 ) 6 ][BF 4 ] 2 (Au 6 L 6 ), were deposited onto a Ti…
Abstract The relative growth rates of the three joint chains of silica tetrahedra and metal octahedra in the [100], [1̅10] and [1̅1̅0] directions within the mica layer (referring to the 1 M unit-cell) seem to control the morphology of mica crystallites. Laths and fibers are the products of relatively fast growth along…
Abstract Several macroscopic properties of degrading poly(lactic acid)‐b‐poly(ethylene glycol)‐b‐poly(lactic acid) (PLA‐b‐PEG‐b‐PLA) hydrogels were compared to one another as functions of degradation time. The specific hydrogel properties measured were the compressive modulus (K), the volumetric swelling ratio (Q), an…