Materials Literature
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Abstract Passive layers on cobalt were prepared in 0.1 N NaOH (pH 13) under potentiostatic control with systematic variation of the relevant parameters, such as time and potential, and examined by x‐ray photoelectron spectroscopy (XPS). The electrochemical preparation of the sputter‐cleaned samples and their transfer…
Abstract CeO2(IV) fine particles were prepared by heating a polyethylene glycol solution of Ce(NO3)3·6H2O at 383 K for 3 h. When a polyethylene glycol whose molecular weight was 7500 or 20000 was used for the preparation, the obtained CeO2 particles were almost monodispersed.
In a classical paper Plesset has determined conditions under which a bubble changing in volume maintains a spherical shape. The stability analysis was further developed by Prosperetti to include the effects of liquid viscosity on the evolving shape modes. In the present work the theory is further modified to include t…
The effect of Ar ion irradiation on the reactivity of crystalline and amorphous quartz to alkali has been examined for clarifying whether radiation from nuclear reactors accelerates the degradation of concrete by inducing alkali-silica reaction of aggregates. Distorted amorphous quartz generated on the surface of quar…
The aim of sodding prosthetic grafts with endothelial cells (EC) is to establish a functioning antithrombogenic monolayer of EC. Application of basement membrane proteins improves EC adherence on ePTFE grafts. Their addition to a biodurable compliant poly(carbonate-urea)urethane graft (CPU) was studied with respect to…
The semiconducting properties of passive films formed on AISI 304 stainless steel and Alloy 600 in borate buffer solution were studied by capacitance (Mott-Schottky approach) and photocurrent measurements. Oxide films formed on 304 stainless steel in air at 350 ºC have also been studied. The results obtained show that…
The coordination chemistry of 6-amino-2,4-di-tert-butylthiophenol (H[LSAP]) and of 2-anilino-4,6-di-tert-butylphenol (H[LOAP]) with cobalt(II) ions was investigated in the presence and absence of dioxygen. It was shown that both compounds were redox-non-innocent ligands, existing in different protonation and oxidation…
Abstract This paper reviews some modern aspects and trends in the development of high performance polymer materials and processing technologies providing fabrication of advanced film and film structures. Changes in understanding of technical requirements and properties, along with novel approaches in creating high per…
The dissipative particle dynamics (DPD) method is used to simulate shear flow between two flat plates. To test this technique, simulations were conducted of both constant and oscillatory shear of a simple fluid. The results of these simulations agree well with theoretical predictions. We subsequently applied our model…
A large amount of Tb2O3 and Dy2O3 has successfully been incorporated into a borate glass with a molar composition of 5B2O3−3Ga2O3−3SiO2−P2O5. Raman scattering analysis revealed the existence of isolated orthborate (BO3)3- groups with increasing rare-earth content. The obtained glass exhibited an excellent Faraday rota…
Development of orientation-induced precursor structures (nuclei) prior to crystallization in isotactic polypropylene melt under shear flow was studied by in-situ synchrotron small-angle X-ray scattering (SAXS) and rheo-optical techniques. SAXS patterns at 165°C immediately after shear (rate = 60 s−1, ts = 5 s) showed…
This study investigates liquid transfer from fabric layer to layer and liquid interaction between different fabrics in clothing systems. A higher external pressure leads to an early onset of transfer wicking. There exists an optimum value of external pressure for the maximum water transfer. The greater the water conte…
Abstract Electromagnetic interference (EMI) shielding materials of complex type of conductive polypyrrole (PPy) as an intrinsically conducting polymer and silver‐palladium (AgPd) metal compound coated on woven or non‐woven fabrics are synthesized. From dc conductivity and SEM photographs of PPy/fabric complexes, we di…
Abstract Oxidation-reduction processes within natural systems greatly influence the properties of sediments, soils and clays. The objective of this experimental study was to gather new evidence for the effects of changes in redox conditions (reduction and reoxidation) on structural properties of ferruginous smectite a…
Author: Seeger, A.; Genre: Journal Article; Issued: 2002-08; Keywords: MPI für Metallforschung; Emeriti and Others; Peierls Barriers; kinks; flow stress; Bordoni relaxation; Snoek-Koster relaxation; gamma-relaxation; tension-compression asymmetry; alloy softening; anomalous slip; Title: Peierls barriers, kinks, and fl…
Two cyano-bridged Gd(III)-Cr(III) complexes [Gd(urea)(4)(H(2)O)(2)](2)[Cr(CN)(6)](2) (1) and ([Gd(capro)(2)(H(2)O)(4)Cr(CN)(6)].H(2)O)(n)(2) (capro represents caprolactam) have been synthesized and characterized structurally and magnetically. Complex 1 has a tetranuclear Gd(2)Cr(2) square structure, in which two cis-C…
Possibilities for engineering of fluorescent micro/nanoscale devices for glucose sensing are presented. A description of the potential for clinical use is given in terms of overall concept, current knowledge, advantages of the fabrication approach proposed, and challenges that must be addressed prior to clinical use.…
The conductive nitrogen-doped diamond-like carbon film (N-DLC) of about 0.14 μm in thickness was deposited on highly conductive silicon wafer (111) with DC magnetron sputtering system. The electrochemical characteristics of the film have been studied with cyclic voltammetry (CV). The N-DLC film electrodes compare very…
Charged and neutral oxygen vacancies in the bulk and on perfect and defective surfaces of MgO are characterized as quantum-mechanical subsystems chemically bonded to the host lattice and containing most of the charge left by the removed oxygens. Attractors of the electron density appear inside the vacancy, a necessary…
Phylogenetic analyses, based upon nuclear small-subunit ribosomal RNA gene sequences, of four ‘chlorosarcinoid’ species referred to Planophila Gerneck show that the genus is polyphyletic. The type species, P. laetevirens Gerneck, is closely related to species in the Ulotrichales, Ulvophyceae. The monotypic sarcinoid g…