Materials Literature
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Abstract Twelve years of research on metal dusting at the Max‐Planck‐Institut for Iron Research have led to comprehensive knowledge on the mechanisms and kinetics of metal dusting and on ways and means for prevention of this corrosion phenomenon, – this knowledge is shortly summarized in this paper. Inspite of this st…
Abstract We successfully prepared a series of thermally stable polyimides (PIs) with low dielectric constant ( k ) by introducing bulky diphenyl fluorenylidene moieties in backbone. The lowest k was found to be 2.77 among non‐fluorinated PIs and 2.35 among fluorinated ones. In order to prove the lowest limit of k in P…
In an attempt to probe a potential template role of the large alkali-metal cations rubidium and cesium in the organization of biorelevant ligands, salicylate and anthranilate complexes of the two elements were prepared and structurally investigated. The studies were also expected to show the marked structural differen…
The current multi-layer insulation used in the extravehicular mobility unit (EMU) will not be effective in the atmosphere of Mars due to the presence of interstitial gases. Alternative thermal insulation means have been subjected to preliminary evaluation by NASA to attempt to identify a material that will meet the ta…
Abstract Fluorocarbon–hydrocarbon microblock copolymers –(CF 2 ) n –(CH 2 ) m – ( n = 4, 6, 8; m = 6, 8, 10) were synthesized. Binding energies of the C 1s and F 1s peaks of these copolymers were measured using x‐ray photoelectron spectroscopy. The binding energy of the C 1s peaks of the carbon atoms of the hydrocarbo…
In this paper, a predictive model of field-induced strain in Ferromagnetic Shape Memory Alloy (FSMA) is proposed. This phenomenological scalar magneto-mechanical model is built in the frame of thermodynamic of irreversible process. The strain mechanism corresponds to the reorientation process of twinned martensite pla…
The synthesis and characterization of a new photolabile protecting group (caging group) for carboxylic acids, the 2-(dimethylamino)-5-nitrophenyl (DANP) group, is described. This compound has a major absorption band in the visible wavelength region with a maximum near 400 nm (epsilon400 = 9077 M(-1) cm(-1) at pH 7.4 a…
ABSTRACT: Total elimination of oxygen (O 2 ) in modified atmosphere packaging of bakery products is difficult to achieve. Because of the typical porous texture of the packaging, air can be retained inside. The effect of O 2 absorbers alone or in combination with modified atmosphere on Eurotium amstelodami, E. herbario…
Over the last decade, molecular dynamics simulations of displacement cascades have revealed that glissile clusters of self-interstitial crowdions are formed directly in cascades and that they migrate one-dimensionally along close-packed directions with extremely low activation energies. Occasionally, under various con…
As a new racemic gelator, 2-acryloylamide-dodecane-1-sulfonic acid (ADSA) was observed to form an organogel with chloroform and tetrahydrofuran. Transmission electron microscopy (TEM) observation for the stained gel from chloroform revealed helical ribbons. Templated by these, both right- and left-handed silver nanohe…
Abstract A room‐temperature aqueous‐chemical route has been developed to synthesize a high proportion (above 80%) of bamboo‐raft‐like bismuth nanotube arrays using bismuth chloride and metallic zinc powder as reagents. The prepared Bi nanotubes have uniform diameters of approximately 3−5 nm and lengths from several hu…
A systematic approach is suggested for predicting the solubility of sparingly soluble solid fine chemicals and pharmaceuticals. The procedure uses group contribution methods for computing the difference in solubility at infinite dilution in the solvent of interest from an optimal reference solvent with the aim of (1)…
Abstract Microcellular plastics (MCP) refer to any plastic with tiny bubbles of less than about 50 microns. It is made by subjecting polymers with a large amount of dissolved gas to a thermodynamic instability so as to nucleate a large number of cells instantaneously. MCP has been extruded and injection molded to make…
ABSTRACT Modern rail grinding practices have developed largely through a combination of field experience and intuitive speculation. Many theories related to crack initiation and growth have been proposed through the decades, and those concepts have been cleverly extended to the field of rail grinding to form the basis…
The hydrothermal stability of the collagen matrixes treated with plant polyphenols (tannins) depends on not only the strength of the polyphenol-collagen interactions but also the distribution uniformity of polyphenolic molecules within the collagen fibrils. Traditional methods of uniformity tests rely heavily on the e…
On the basis of the difference in meso-13C chemical shifts, we have concluded that the intermediate-spin iron(III) complexes with highly ruffled and highly saddled porphyrins have different electron configurations. While the latter has a conventional (dxy)2(dxz, dyz)2(dz2)1, the former adopts a novel (dxz, dyz)3(dxy)1…
A process to manufacture porous oxide matrix/polycrystalline oxide fiber composites was developed and evaluated. The method uses infiltration of fiber cloths with an aqueous slurry of mullite/alumina powders to make prepregs. By careful manipulation of the interparticle pair potential in the slurry, a consolidated slu…
Abstract Direct visualization of crystal growth in poly( L ‐lactide) thin films was carried out by using a temperature‐controlled atomic force microscopy (AFM). At the initial stage of crystallization, edge‐on lamellar crystals have nucleated and elongated. Subsequently, the edge‐on lamellar crystals showed S‐shaped m…
Abstract Using standard and temperature‐modulated differential scanning calorimetry, we have studied the segmental relaxation behavior of montmorillonite‐epoxy nanocomposites. The experimental results showed that the incorporation of clay particles caused the epoxy network to exhibit slower relaxation dynamics compare…
Organic derivatives of the protonated triple-layered perovskite HCa 2 Nb 3 O 10 · x H 2 O with n -alkoxyl groups on the interlayer surface have been prepared by grafting n -alcohols. Interlayer surface modification of HCa 2 Nb 3 O 10 · x H 2 O is achieved by a direct reaction of HCa 2 Nb 3 O 10 · x H 2 O with methanol…