Materials Literature
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The reaction in a Bi(NO3)3-Na3Hcit-(H2O + glycerol) system was studied in a wide range of component ratios by the solubility method and pH-metry in combination with chemical analysis of solid phases. Poorly soluble phases of Bi(Hcit) x (OH)3(1 − x) · mH2O (x < 1) and sodium bismuth citrate NaBiCit · 3H2O were obtained…
We report on the synthesis, sintering, and crystallization behaviors of a glass with a composition corresponding to 90 mol % CaMgSi2O6−10 mol % NaFeSi2O6. The investigated glass composition crystallized superficially immediately after casting of the melt and needs a high cooling rate (rapid quenching) in order to prod…
There are an abundance of hydrophilic groups in the collagen fibers in leathers. Because the affinity between these hydrophilic groups and water molecules varies with changes in temperature and relative humidity, leathers will adsorb or de-adsorb water as these factors change; affecting strength, permeability, and the…
Novel organic-inorganic hybrids based on cellulose acetate butyrate (CAB) were synthesized applying sol-gel process. The inorganic phase was introduced into polymer matrix by hydrolysis and condensation using tetraethoxysilane (TEOS) as the precursor, under acidic conditions. The obtained organic-inorganic hybrids wer…
The frequency and temperature dependences of the permittivity and conductivity of FeGaInS 4 single crystals in an ac current have been investigated. The permittivities of single crystals and activation energies of permittivity and conductivity are determined. It is established that the conduction of these crystals in…
The polymerization of tetrafluoroethylene (TFE) is initiated by the radicals generated by the radiolysis of acetone. The oligomer chain length n increases with an increase in the initial monomer concentration C. The transition from the true to the colloid solution at C ≈ 0.07 mol/l takes place at an average telomer ch…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Afshin Moradi; Microwave absorption of magnetized hydrogen plasma in carbon nanotubes. Physics of…
Composite materials based on the multiwall nanotubes (content in the material from 1 to 65 wt %) and polyaniline are prepared and characterized. The composite materials are prepared by four methods: chemical synthesis, electrochemical synthesis, mixing of dry components, and mixing of solutions with subsequent removal…
Integrated photonic devices were realized using colloidal quantum dot composites such as flexible microcavity laser, microdisk emitters and integrated active-passive waveguides. The microcavity laser structure was realized using spin coating and consisted of an all-polymer distributed Bragg reflector with a poly-vinyl…
The optical characteristics of quartz glass are studied in the bulk and on the surface by the method of differential Fourier transform IR reflection spectroscopy. Tabular values of the optical constants that characterize the bulk properties of quartz glass in the range 3.5–2000 µm are obtained. Particular features of…
Effects of thermal aging on physico–chemical and electrical properties of polymethyl methacrylate (PMMA) are reported in this paper. PMMA samples are submitted to successive heat–cooling cycles (Tmin=20 ∘C and Tmax=90 ∘C) in the ambient air, each cycle lasts 12h. Different techniques are thus employed to investigate s…
The p-ZnO/n-ZnSe heterojunction was prepared by the photothermal oxidation of ZnSe substrate. Currentvoltage characteristics are measured and discussed. The potential barrier height is equal to 3 eV at 300 K and its anomalous temperature coefficient reported here is due to the high defects concentration ( 10 14 cm -2…
The influence of the grain size on the dislocation interaction mechanisms that control the deformation of aluminum in the temperature range 4.2–295K is studied. For this, samples of coarse-grain (CG) and ultrafine-grain (UFG) aluminum obtained by equi-channel angular pressing were deformed by stretching at constant ra…
Abstract A model based on grain/interphase boundary sliding controlled flow that develops to a mesoscopic scale (defined to be equal to or more than a grain diameter) has been used to understand superplasticity in micrometer- and sub-micrometer grained intermetallics. The procedure for analyzing the experimental stres…
The INE-Beamline for actinide research at the synchrotron source ANKA is operated by the Institut für Nukleare Entsorgung (INE) at the Forschungszentrum Karlsruhe. Experiments on radioactive samples with activities up to 10 6 times the limit of exemption inside a safe and flexible double containment concept are possib…
Electron beam exposure is the tool of choice for highest resolution lithography but suffers from the low throughput during serial beam writing [T. Ito and S. Okazaki, Nature (London) 406, 1027 (2000); R. F. Pease and S. Y. Chou, Proc. IEEE 96, 248 (2008)]. The authors designed and developed a low-cost self-powered nea…
A new species of ‘fragilarioid’ diatom belonging to the genus Punctastriata Williams & Round is described from Lake Glubokoe (Moscow Area, Russia). P. glubokoensis sp. nov. shares particular features of the genus Punctastriata: multiseriate striae, lack of rimo-portulae, presence of a single apical pore field and a si…
The determination accuracy of the parameters of multilayer structures during their in situ ellipsometric monitoring is analyzed. A qualitative criterion is proposed that makes it possible to evaluate the validity of replacement of the multilayer structure by a certain medium with effective optical constants. According…
This paper deals with the microwave study of coplanar tunable capacitors using Mn-doped Ba(0.6)Sr(0.4)TiO(3) ceramics. These ceramics are developed to improve performance at microwave frequencies (i.e., compromise between tuning capabilities and insertion losses). Interdigitated capacitors were first fabricated on thi…
A batch foaming process has been employed to obtain microcellular materials from polystyrene plus a SBM copolymer (polystyrene-co-1,4-polybutadiene-co-poly(methyl methacrylate). In the first part of the process, raw materials were mixed and extruded in a proportion 90:10 to obtain the precursor materials, leading to a…