Materials Literature
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The surface morphology and the structure of porous germanium layers obtained by chemical etching of n -type single-crystal Ge(111) substrates with their subsequent annealing in hydrogen atmosphere are studied by high-resolution X-ray diffractometry. It is established that upon etching a 1.5 to 2.0-μm-thick porous germ…
The vapour pressure of solids can be obtained using a number of methods, including the Knudsen effusion method, the Knudsen torque‐effusion method and a transpiration method. Each method has benefits and disadvantages. Reported is a comparison of vapour pressure data for two compounds, quinizarin and leuco ‐quinizarin…
The anticorrosive behaviour of octadecylamine (ODA) films has been investigated via weight loss and electrochemical methods. Tests were conducted on specimens of carbon steel, brass, and austenitic stainless steel in the presence and absence of amine films. Inhibitor efficiency values in excess of 94·5% were obtained…
With the ongoing decrease in magnetic spacing, the chemical durability of the lubricant film on magnetic recording media becomes a major factor in the reliability of the head-disk interface. There are several reports in the literature that have attributed deterioration of lubricant film to catalytic decomposition, and…
To elucidate the mechanism of nucleation and growth of filamentary crystals on the bipyramid faces of KH 2 PO 4 (KDP) crystals from solution with the addition of Al(NO 3 ) 3 · 9H 2 O, the growth rates and transverse dimensions of the crystals were measured at various supersaturations, temperatures, and impurity concen…
The residual effects of thermal aging on Twaron fibers have been studied using X-ray diffraction, weight analysis, scanning electron microscopy and tensile testing. X-ray data from isothermally aged fibers indicate the introduction of changes at the level of the crystal lattice, which include reduction in crystallinit…
Magnetic characteristics of the Nd2Fe14BHx single crystals and polycrystalline samples were investigated in the temperature range 4.2–750 K. It is established that hydrogen absorption does not change the crystal structure of these compounds but is accompanied by an expansion of a unit cell volume. The obtained data sh…
Avoidance of solvents in bonding operations is a current demand in the footwear industry. Halogenation of rubber soles with solutions of trichloroisocyanuric acid (TCI) in different solvents has been successfully used to improve bonding to the leather uppers. In this study, the use of chlorine bleach as an alternative…
The properties of precipitated silica modified with hexadecylamine, dodecanol, 9-decen-1-ol and γ-mercaptopropyltrimethoxysilane have been characterised and related to elastomer reinforcement capability. Extensive modification with these agents decreased the specific surface area and the critical surface energy of sil…
Abstract The measured optical and transport properties of single-crystal SrTiO3 have been determined as a function of oxidation and reduction using spectroscopic ellipsometry, Hall and resistivity measurements. A decrease in the valence to conduction band transitions across the band gap, from O 2p to Ti 3d states, is…
Goldbach’s conjecture, the crystallographic restriction, and the orders of the elements of the symmetric group. First recall that for an element g of a group G the order Ord(g) of g is defined to be the smallest natural number such that g Ord(g) = id if such a number exists, and Ord(g) =∞otherwise. In dimension n, the…
We have studied the electrical properties and microstructure of fluorine‐doped BaTiO 3 ceramics. The samples were prepared using a classical ceramic technology that involved the calcination of intimately mixed powders of BaCO 3 , TiO 2 , and BaF 2 . When the samples were sintered in untreated ambient air, the fluorine…
Abstract Hydrogen‐bonded supramolecular copolymers were easily prepared by mixing cyclohexanetricarboxamides with three ( 1 ) and six ( 2 ) alkylsilyl groups, and supramolecular fibers were fabricated. When the composition of 1 and 2 was at or close to equimolarity, the supramolecular copolymer chain was found to have…
The grating division-of-amplitude photopolarimeter (G-DOAP) is an instrument that exploits the multiple-beam-splitting, polarizing, and dispersive properties of diffraction gratings for the time-resolved measurement of the complete state of polarization of collimated broadband incident light, as represented by the fou…
Colloidal particles coated by polyelectrolyte multilayers of alternatingly positive and negative charge are shown to interact strongly with lipid vesicles. We have studied two cases: (i) the interaction between beads and small unilamellar vesicles (vesicles diameter smaller than the particles one), where we found evid…
The cell responses of rat osteoblasts and fibroblasts to water-soluble phosphorylated chitin (P-chitin) were examined in vitro. Cell morphology was observed at 1, 4 and 7 days, respectively. A wide range of measurements, including the percentages of viable cells, total intracellular protein content, and 3-[4,5-dimethy…
Near-field diffraction patterns are merely aberrated Fraunhofer diffraction patterns. These aberrations, inherent to the diffraction process, provide insight and understanding into wide-angle diffraction phenomena. Nonparaxial patterns of diffracted orders produced by a laser beam passing through a grating and project…
Ba 8 Ga 10 Si 36 and Ba8Ga16Si30 clathrates were prepared by the arc melting method and characterized for their structure, transport, and thermal properties by x-ray diffraction, electron probe microanalysis, electrical resistivity, and thermal conductivity measurements. The Rietveld refinement results gave the total…
Single-crystal X-ray diffraction studies of brochantite demonstrate its Order-Disorder (OD) character. The OD structures of the brochantite family can be described as built up by equivalent OD layers with symmetry Pn2 1 m. Two MDO polytypes are possible in this family, and both have been identified in specimens of bro…
A multilayer structure [TiN(5 nm)/interlayer metal(2 nm)/TiN(5 nm)] has been evaluated as a diffusion barrier between copper and silicon. Three metals (M=Ru, Cr, and Zr) were tested as interlayer materials for the multilayer diffusion barrier scheme, expecting that they will stuff the TiN grain boundaries by forming m…