Materials Literature
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The work presents the electrical and dielectric characterization of proton-conducting, chemically-crosslinked nanocomposites of polyvinyl alcohol (PVA) and phosphotungstic acid (PTA). The composite membranes were prepared by in situ crosslinking of the polymer matrix in solution form, containing PTA. The electrical an…
Vicinal surfaces with terraces of alternating stress develop inhomogeneous distributions of terrace sizes which sometimes leads even to the formation of double steps. Both vicinal Si(001) and vicinal Ge(001) are typical examples for this behavior. However, vicinal surfaces of some alloys show this effect, too. It is w…
Electric-field-induced transition was observed for the weakly birefringent chiral B2 phase, which is formed from the banana molecule based on the naphthalene bent core. This phase is considered to possess the twisted grain boundary (TGB)-like helical structure. When an electric field is applied, the TGB-like helix unw…
Abstract The kinetics of phenol–formaldehyde prepolymers catalyzed by sodium hydroxide at various temperatures was studied. Several reactions were conducted with different phenol to formaldehyde as well as phenol to sodium hydroxide molar ratios. The React‐IR system was used to monitor the reaction as well as to deter…
We report on the synthesis of novel three-dimensional nanoporous Pt–Ru bimetallic networks by decorating nanoporous Pt networks with Ru using a hydrothermally assisted precipitating process. Scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS) were used to characterize the morphology and t…
The vinyl polymer/montmorillonite nanocomposite (PVP/C-MMT) was prepared successfully using the way of polymer intercalation from solution. Gel permeation chromatography (GPC) result of PVP showed that polydispersity of PVP was 3.24 with broadly molecule distribution. The results of scan electron microscope (SEM) and…
We derive general relations between grain boundaries, rotational deformations, and stress-free states for the mesoscale continuum Nye dislocation density tensor. Dislocations generally are associated with long-range stress fields. We provide the general form for dislocation density fields whose stress fields vanish. W…
Acrylic resin/nano-SiO2 (AR/nano-SiO2) composite was prepared by physical blends of acrylic resin (AR) and nano-SiO2, which was synthesized via the sol–gel way of tetraethoxysilane (TEOS) catalyzed with ammonia. The synthetic conditions of nano-SiO2 sol in the homogeneous experiment on nanocomposite' property were stu…
We give a quantitative analysis of the previously published nuclear magnetic resonance (NMR) experiments in the $\ensuremath{\kappa}\text{\ensuremath{-}}{(\mathrm{E}\mathrm{T})}_{2}X$ family of organic charge-transfer salts. The temperature dependence of the nuclear-spin relaxation rate $1∕{T}_{1}$, the Knight shift $…
A chemical actinometer that employs an aqueous solution of ferrioxalate and polyoxometalate (POM: SiW120404-) is proposed as a simple and fast method that quantifies the light intensity of UV radiation in the 300-390 nm range. As a modified ferrioxalate actinometer, illuminated ferrioxalate solution in the presence of…
The real and imaginary parts of the dielectric function of TlGaSe 2 single crystals are investigated in the frequency range 30 Hz–13 MHz and at temperatures 80 K–300 K. A low frequency dispersion due to the interfacial polarization within the crystals is observed. The temperature dependence of relaxation time is obtai…
In this paper we have shown a potential approach to fabricate relaxor materials by making a ceramic composite of environmental friendly Ba-based diffuse ferroelectric BaZrxTi1−xO3 (x = 0.20 and 0.25) with non-ferroelectric magnesium oxide (MgO). The dielectric behaviour of BaZrxTi1−xO3 : 50 wt% MgO (x = 0.20 and 0.25)…
A new multi-phase Eulerian model for the columnar and equiaxed dendritic solidification has been developed. In this paper we first focus on the numerical simulation of quasi-steady solidification experiments in order to obtain corresponding CET maps. We have identified three main zones on the CET map: the pure columna…
Abstract A novel poly(vinyl chloride) nanocomposite with layered double hydroxide was successfully prepared via a melt‐compounding process in which the positively charged platelets were dramatically exfoliated and homogeneously dispersed. Because of the absorption of the released hydrochloric vapor by both layered dou…
Thin films of indium tin oxide doped with ZnO thin films have been prepared by the electron-beam evaporation technique. The effects of heat treatment and ZnO content on the structural, optical and electrical properties of these films have been investigated. The optical transmission was found to improve with increasing…
We report the use of electron beam-induced fragmentation (EBIF) to produce arrays of nonoverlapping bimetallic Bi−Ni nanoparticles. Factors influencing this fragmentation process include the precursor particle composition, morphology, melting temperature, type of melting (peritectic vs eutectic), and the ability to di…
Crystal structure, structural disorder, and hydration behavior of Ca 7 ZrAl 6 O 18 were investigated by laboratory X-ray powder diffraction (Cu Kα 1 ) and conduction calorimetry. The initial structural model with 21 independent atoms in the unit cell was determined using direct methods, and it was further modified to…
We evaluated the variations of the magnetic hysteretic behaviour of Fe–1wt%Cu model alloy samples due to thermal aging and over-aging. In these alloys, the formation and growth of Cu-precipitates during the thermal aging process results in mechanical hardening, whereas for aging times higher than a certain critical va…
The theory given earlier for field emission from a curved surface has been extended to use the parameter d characterizing the energy distribution. Measurement of the curvature of the Fowler–Nordheim plot together with d for the same emitter enables the work function of the surface to be deduced, together with emitter…
Ion track lithography has been applied for transferring the self-ordered nanopattern of porous anodic alumina to single-crystalline rutile TiO 2 substrates. As a result, nanometre resolved arrays have been fabricated with an aspect ratio ranging from 5 to 16, over areas of several square millimetres. Differences in th…