Materials Literature
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Ionic conductivity in ferroelectric oxides having the perovskite structure is reviewed. Depending on the compound, doping levels, and equilibration conditions, ionic transport numbers approaching unity have been observed under equilibium conditions. The ionic conductivity decreases with decreasing temperature with an…
LCSL
The phase field model for free boundaries consists of a system of parabolic differential equations in which the variables represent a phase (or “order”) parameter and temperature, respectively. The parameters in the equations are related directly to the physical observables including the interfacial width $\epsilon $,…
Sulfonated indolinespirobenzopyran (SP–SO3–) was intercalated into the Mg/Al or Zn/Al layered double hydroxides (LDHs) in the presence of toluene-p-sulfonic acid (PTS). The new intercalates exhibited reversible photoisomerization between SP–SO3– and merocyanine (MC). The presence of PTS was critical for the reversible…
In a project devoted to the elimination of toxic materials in methods of corrosion protection, a surface modification process has been developed to improve the pitting resistance of high copper aluminium alloys such as 2024 and 7075 without the use of chromates. This process involves immersion in boiling Ce(NO3)3, ano…
Ti–Ni shape memory alloy thin films were deposited using an RF magnetron sputtering apparatus. The as-sputtered films were heat-treated in order to crystallize and memorize. After the heat treatment, the shape memory characteristics have been investigated using DSC and thermomechanical tests. Upon cooling the thin fil…
Contents: A tutorial review of radioisotope power systems (R.G. Lange and E.F. Mastal). Summary of space nuclear reactor power systems 1983- 1992 (D. Buden). Silicon-germanium: an overview of recent developments (C.B. Vining and J.P Fleurial). Review of thermionic technology 1983- 1992 (R.C. Dahlberg et al.). Space nu…
Abstract The acoustic and dielectric properties of different glasses at audio frequencies and temperatures below 1 K have been investigated with the vibrating reed and a capacitance bridge technique. We found the temperature dependence of the absorption of vitreous silica (Suprasil W) to agree with the predictions of…
The severely distorted conformation adopted by the uncomplexed TRIMEB molecule in the solid state is attended by ring-inversion of one of the seven methylglucose residues.
$^{57}\mathrm{Fe}$ M\"ossbauer measurements show that the ${\mathit{T}}_{\mathit{c}}$ of 〈12〉-nm particles of ${\mathrm{MnFe}}_{2}$${\mathrm{O}}_{4}$ is higher than that of the 〈33〉-nm particles, which exhibit the bulk ${\mathit{T}}_{\mathit{c}}$ value (573 K). The $^{57}\mathrm{Fe}$ isomer shift as well as the intern…
Recent progress in the development of polymer-based materials for use as electrocatalysts and as amperometric sensors is discussed. Single component and multicomponent polymer based systems are described, and theoretical approaches recently developed to quantify the steady state amperometric current response are discu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrosslinked polymer materials for nonlinear optics. 2. Polyurethanes bearing azobenzene dyesJ. A. F. Boogers, P. T. A. Klaase, J. J. de Vlieger, and A. H. A. TinnemansCite this: Macromolecules 1994, 27, 1, 205–209Publication Date (Print):January 1, 1994Publication History Pu…
Gratings formed by photorefractive and photoisomerization processes in an azo-dye-doped polymer, poly(vinyl carbazole):trinitrofluorenone/Disperse Red I, are investigated by polarization- and field-dependent four-wave mixing experiments. High diffraction efficiencies and long storage times are observed for the photore…
Stable fluorinated vesicles--i.e. vesicles with a hydrophobic and lipophobic fluorinated film within their bilayer membranes--have been obtained from a variety of neutral, zwitterionic or anionic fluorinated amphiphiles, including single chain phosphocholine derivatives, double-chain phospholipids, glycolipids and gly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the glass transition behavior, interaction energies, and hydrogen-bonding strengths of binary poly(p-vinylphenol)/polyether blendsP. Pedrosa, J. A. Pomposo, E. Calahorra, and M. CortazarCite this: Macromolecules 1994, 27, 1, 102–109Publication Date (Print):January 1, 1994…
To describe charge conduction in conducting polymers a dual transmission line with one resistance describing electronic motion in the polymer and a second resistance describing ionic motion in the pores has proved applicable to a number of systems. A further feature of ac impedance plots for these polymers is a high-f…
Actin based motor protein was purified from Chara corallina using high performance liquid chromatography. Sodium dodecyl sulfate gel electrophoresis showed that the molecular weight of the main band was about 230kDa. Although the molecular weight was quite similar to that of the heavy chain of muscle myosin (myosin II…
Abstract
The effects of the addition of interface modifiers on the structure and properties of wood fiber-filled polypropylene (PP) have been studied. Although an increase in the wood fiber loading reduces the overall cost of composites, the mechanical properties of such composites are very poor in the absence of a suitable in…
Hydrotalcites catalyse Baeyer–Villiger oxidation of ketones using a combination oxidant system of molecular oxygen and benzaldehyde to give high yields of lactones and esters at 40 °C.