Materials Literature
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Polymers containing mesogenic groups in side and main chains of macromolecules represent liquid crystalline (LC) polymers as a special class of polymeric materials. Peculiarities of electrooptical behaviour of side-chain polymers as ferroelectric materials and opticallyrecording media as well as the future of LC engin…
The reduction reaction between FeCl3 intercalated into graphite and potassium has been studied. The reduction of FeCl3 to metallic Fe and KCl occurred in the graphite gallery and, as a consequence, the reduction products were supposed to be confined within the graphite matrix. By coupling energy-dispersive X-ray spect…
The effective propagation constants and attenuation rates in dense nontenuous media with coated dielectric particles governed by size distributions are studied. A coated particle consists of two layers with different materials. In a dense medium, particles do not scatter independently and the effects of correlated sca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR imaging of diffusion of small organic molecules in silk fibroin gelTetsuo Asakura, Makoto Demura, Hidejiro Ogawa, Kazuhiro Matsushita, and Mamoru ImanariCite this: Macromolecules 1991, 24, 2, 620–622Publication Date (Print):January 1, 1991Publication History Published on…
Abstract The phase equilibrium in the systems Na 2 SeO 4 –CuSeO 4 –H 2 O and Na 2 SeO 4 –ZnSeO 4 –H 2 O were studied and it was established that new phases were obtained – double salts with a composition: Na 2 Cu(SeO 4 ) 2 · 2 H 2 O and Na 2 Zn(SeO 4 ) 2 · 2 H 2 O. The fields of phase equilibrium of the double salts i…
A study was made on the effect of the silicon content on secondary recrystallization in grain-oriented electrical steel produced by the single-stage cold rolling process where both MnS and AlN are utilized as inhibitors. The following conclusions were derived from the study:(1) The onset and progress of secondary recr…
A Taylor type polcrystalline model, together with a new fully implicit time integration scheme have been developed to simulate the evolution of crystallographic texture during the deformation of face centered cubic metals deforming by crystallographic slip. The constitutive equations include a new equation for the evo…
Layered crystals of GaSe are grown by the Bridgman method. Transmission spectra are measured for various sample configurations with respect to the c -axis, applied electric field, direction of incident light and polarization. Absorption edge shifts toward longer wavelength by 20 nm under an electric field of 1 kV/cm,…
All articles of this category 1-(α-Diazobenzyl)pyrene ( 1c ), red prisms stable at room temperature for more than three months, reacted with the p -toluenesulfonic acid salts of amino acids to give the corresponding highly fluorescent amino acid α-(1-pyrenyl)benzyl ester salts in moderate yield. The amino acids were r…
SummaryThe discovery and use of glyoxylic acid as an alternative reducing agent to formaldehyde for electroless copper processes is described. Using glyoxylic acid eliminates the environmental hazards and health and safety concerns associated with formaldehyde. Due to the similarity in chemistry between formaldehyde a…
The corrosion of Zircaloy-4 is accelerated in water or steam above about 350°C when LiOH is present in sufficient concentrations. A short-term test (16 h) to predict inreactor corrosion behavior has been developed based on this accelerated corrosion. A group of claddings with a range of in-reactor corrosion behavior h…
Passive films on high purity Fe-Cr alloys (13-24 mass% Cr), which were prepared by an Ar plasma melting method using high purity Fe produced by a method combining anion exchange and zone-refining processes and high purity Cr produced by an iodide process, have been investigated in-situ in pH 6.0, 1 kmol·m–3 Na2SO4 usi…
Research News/Diamond Thin Film Technology IIb : The second part of this article continues the description of work presented at a two‐week Advanced Study Institute held in the mountains of Tuscany. Topics under discussion were deposition methods, deposition parameters, and applications, including cutting tool inserts,…
Abstract Blends of sulphonated polystyrene, neutralized with metal ions, have been prepared in various proportions with polystyrene homopolymer. Morphology, microstructure, and deformation modes of strained, cast thin films have been examined by transmission electron microscopy. Variables studied include blend composi…
We analyze the effect of space-correlated disorder on diffusion in a one-dimensional continuous disordered medium. We calculate the frequency-dependent diffusion coefficient using a method based on a perturbative treatment around an effective homogeneous medium. Exact results for disorder modeled by a two-level proces…
ZrNi, ZrCo and their hydrides doped with 57 Fe are investigated using Mössbauer spectroscopy. Hydrogenation of ZrNi results first in ZrNiH and then in ZrNiH 3 , whereas only ZrCoH 3 is produced in the case of ZrCo. At low hydrogen concentrations hydrogen atoms enter mainly 4 c 1 interstitial sites, but 8 f 1 , 8 g 2 a…
Transition temperatures for 367 straight chain 4,4′-alkyl/alkoxyphenylbenzoates (through Nov. 1990) have been compiled and critically evaluated. Information was obtained wherever possible, with the exception of the patent literature, and examined for editorial coherency. Line graphs of the melting and clearing tempera…
A neutron diffraction study of a 50 mol kg–1 aqueous solution of deuterated ammonium nitrate [ca. 1 : 1 molecular ratio of D2O : N(1)D4N(2)O3 which is the saturation solubility at ca. 70 °C] was carried out at 100 °C. The first- and second-order isotopic difference methods of neutron diffraction were applied to the ni…
Abstract We propose a method and a system for counting secondary electrons and for displaying micrographs from the SEM in real time. Evaluating the images obtained by the new system, we confirm that electron counting images have a higher signal to noise ratio than analogue images. This tendency is remarkable when the…
Ferroelectric materials such as lead zirconate titanate (PZT) possess several characteristics which are desirable for high density volatile and nonvolatile memories including a high dielectric constant, high speed read/write capability, large remanent polarization, and long term data retention.