Materials Literature
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The yield of hydrogen gas generated by radiolysis of water with SiO2 nanoparticles dispersing was found to increase with the dose of gamma rays pre-irradiation of the particles. Pre-irradiation experiments will be carried out also by using electron beams and for nanoparticles of other kind of materials to investigate…
We have prepared pH-responsive PM-CO2H films atop an alumina porous support by a surface-catalyzed polymerization and subsequent hydrolysis. Film resistances against ion transfer decrease by a factor of 200 between pH 4 and pH 11 as the film becomes charged.
Abstract A photochromic diarylethene, 1,2‐bis(2‐methyl‐5‐(4‐ N , N ‐dimethylaminophenyl)thien‐3‐yl)perfluorocyclopentene in proton‐donating media was studied. The ammonium salt came into being in the presence of acetic acid following localization of lone pair electrons of the amino group. The maximum absorption of the…
The piezoelectric characteristics of boron-nitride and carbon nanotubes were calculated. The electronic structure of nanotubes was studied using the quantum-chemical semiempirical MNDO method within a molecular-cluster model. The piezoelectric constants e zzz, e xzz, and e xxx of boron nitride nanotubes of two structu…
SiOC(–H) films were deposited on a p -type Si(100) substrate by plasma-enhanced chemical vapor deposition (PECVD) from methyltriethoxysilane (MTES) and oxygen precursors. The MTES/O 2 flow rate ratio was varied from 40 to 100% to investigate its effect on the properties of the films. Film thickness and refractive inde…
Progress in construction of electrical insulation systems needs new investigations of partial discharges (PD) mechanisms. Working conditions and exploitation stresses, i.e. overvoltages, harmonics and other disturbances have crucial influence on arising of PD in insulation systems. Their influence on partial discharge…
Highly nonlinear electrically insulating materials have applications in high voltage cable applications. In this contribution, nanocomposites were prepared by blending ZnO nanoparticles or ZnO nanoparticles treated with aqueous SnX2(X = F or Cl), with EPDM (ethylene propylene diene monomer). The treated powders were a…
Partial discharge (PD) phenomena with a twisted pair configuration of insulated conductors have been investigated in a low pressure environment. The pressure range was from 2 to 760 Torr. PD waveforms were recorded using a 50-Omega viewing resistor. Representative PD waveforms at various pressures are presented. Three…
Mesoporous carbons were obtained by sequential nano-casting using the following hard templates: (i) mesoporous silica nanospheres with MCM-41 or MCM-48 analogous structure; (ii) non-porous silica nanospheres and (iii) pyrogenic silica (Aerosil 200). These silica templates (patrix) were impregnated with sucrose, carbon…
We propose a mathematical model for the deflection of single crystal films of Ni 2 MnGa ferromagnetic shape memory alloys in response to the application of a magnetic field. We then present the results of numerical simulations obtained from the finite element approximation of this model to study the deflection of the…
The careful analysis of resistance evolution with time during electromigration tests provided valuable information about damascene architecture and intrinsic electromigration behaviour. We found first, that resistance evolution includes an abrupt event, the amplitude of which is usually corresponding to the failure cr…
Three-dimensional surface structures composed of micropillars with different diameters (8–110 µm) and interpillar distances were fabricated using a thick-film photoresist, and the surface was modified with a hydrophobic plasma-polymerized film using hexamethyldisiloxane (HMDS) as a monomer. Surface hydrophobicity was…
The mixed oxalate Mn 1/3 Co 2/3 C 2 O 4 · 2H 2 O has been prepared in the form of whiskers 2–5 μm in diameter and up to 50 μm in length and spheroidal nanofiber arrays 20 μm in diameter using two different coprecipitation procedures. Thermal decomposition of this oxalate in air has led to the formation of MnCo 2 O 4 p…
Magnetization of nanoparticles of Mg-Mn ferrite, synthesized using high energy ball milling has been studied. X-ray diffraction pattern of the particles milled for 6 h confirmed the single-phase cubic spinel structure with a lattice parameter of 8.47 A. Langevin function fitting on M-H data at 300K gives a log-normal…
Detailed structural data are presented for La0.7Sr0.3Mn1−y CryO3 solid solutions with 0 < y ≤ 0.10. Chromium substitution on the manganese site is shown to reduce the T C of the solid solutions at a rate of 4 K/mol % Cr. The 300-K magnetoresistance of La0.7Sr0.3Mn1−y CryO3 attains 8% in a field of 1.2 MA/m.
Polyaniline (PANI) sandwich structures with Al and/or Au electrodes have been investigated using temperature dependent I-V measurements and impedance spectroscopy in the 50 mHz -1 MHz frequency range. The I-V measurements on the Au/PANI/Au structure have shown a practically Ohmic behavior, while the Au/PANI/Al structu…
Abstract An aerosol generated by the ultrasonic oscillation of either a 0.2 M or a 0.02 M solution is supplied through two furnaces onto heated glass substrates of Corning #1737 to coat thin films of indium tin oxide (ITO; Sn‐doped In 2 O 3 ). The electrical resistivity, the carrier concentration, the Hall mobility, a…
The transformations of platinum and a heteropoly acid (HPA) in binary systems prepared from H2PtCl6 or H2PtCl4 and H3PMo12O40 were studied using IR and UV-VIS spectroscopy, elemental analysis, XPS, EXAFS, TPR, and HREM. The calcination of platinum chloride with the HPA to 450°C resulted in the formation of a platinum…
This work investigates the generation and detection of gaseous scintillation signals produced in variable pressure scanning electron microscopy through electron-gas molecule excitation reactions. Here a gaseous scintillation detection (GSD) system is developed to efficiently detect photons produced via excitation reac…
Non-oxide ceramic-matrix composites (CMCs) are subjected to be used in aeronautic applications which require very long duration (up to 100 000h) of materials at high temperatures and under air. Recently a self-healing [Si-B-C] matrix has been developped to enhance strongly the lifetime of CMCs under air. The aim of th…