Materials Literature
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Abstract Graft copolymerization of water soluble vinyl monomers such as acrylic acid and acrylamide onto isotactic polypropylene by the pre‐irradiation method has been studied. Grafting was carried out in a water and water‐methanol solvent system. The percentage of grafting has been determined as a function of (i), to…
Abstract A new photochromic spiro[3H-1,4-oxazine] 4 is described. The absorption spectra of 4 have been examined and compared with those of spiro[indoline-naphthoxazine] 1. The colored form of 4 has the absorption maximum shorter than that of 1. Compound 4 showed excellent light fatigue-resistant property.
A method is described for measuring the water vapor resistance of textiles under variable conditions of relative humidity (RH). It consists basically of varying the position of the sample in an air gap between a wet and a dry surface while keeping all other conditions constant. The resistance is determined by the rate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinucleating, macrocyclic [14]N4 ligands and their complexes. Synthesis of the free ligand 2,3-dioxo-5,6:13,14-dibenzo-9,10-(4',5'-dimethylbenzo)-1,4,8,11-tetraazacyclotetradeca-7,11-diene (L) and of the 7,12-Me2-L metal complexes and derivatives. Crystal structures and prop…
With the use of some obstacle rings and a set of retarding grids, the resolution of the prototype spherical mirror analyzer, which has been developed in a previous paper [H. Daimon, Rev. Sci. Instrum. 59, 545 (1988)], was improved. The uniformity of the resolution with respect to the emission angle was also achieved.…
Using x-ray photoelectron spectroscopy (XPS), the interaction of sodium molybdate with Al was studied under a number of different conditions, including variations on molybdate concentration, pH, and applied potential. By comparison with a database of Mo binding energies, the results show several different oxidation st…
The magnetotransport properties of ${\mathrm{NbSe}}_{3}$ in the temperature range below the second charge-density-wave (CDW) onset of 59 K have been studied in magnetic fields up to 230 kG. At liquid-helium temperatures giant magnetoquantum oscillations caused by magnetic breakdown (MB) between the normal Fermi surfac…
The phase behavior of liquid cyrstalline polymers and oligomer model compounds with alkylated tripheylenes (see figure) as the mesogenic core is studied using a combination of optical microscopy, DSC and 2 H NMR. The information provided by NMR provides unique insights into the behavior of liquid crystalline phases. m…
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Measurements of surface area reduction of TiO 2 anatase powder (of initially 100 m 2 · g −1 ) were carried out for various partial pressures of water and oxygen at 823 K. The kinetic equation obtained for the experimental rates has the formulation r = k[P H2O ] 1/α [ P O2 ] 1/β where α and β are equal to 2 and ‐12, re…
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Abstract The thermodynamic principles of conventional (T‐ x , P‐T) phase diagrams and solubility (log ΣK‐ x ) diagrams depicting solid‐solute phase equilibria in aqueous solution are derived from a unifying point of view. It is shown that thermodynamic quantities necessary for the construction of conventional phase di…
There is still some debate on the extent of plasticity of oxide scales at high temperatures. Examination of scales after creep of the substrate often shows that at higher strain rates scale cracks are visible after only very low strains (brittle behaviour), whereas at low strain rates no scale cracks are observed afte…
The ellipsometric measurement of refractive indexes for films less than 50 nm thick is of dubious quality due to the significance of the size of random errors relative to the accuracy required to extract reliable index values from the measurements. In this study the various errors are quantitatively assessed as a func…
A fiber-optic system was developed for exciting and collecting surface-enhanced Raman scattering (SERS) signals generated from a sensing plate tip having silver-coated microparticles deposited on a glass support. Various fiber parameters, such as fiber type, fiber-substrate geometry, and other experimental parameters,…
The synthesis, structural characterization and electrical conductivity measurements of α-,β-[(CH3)4N][Pd(dmit)2]2 and [(CH3)4As][Pd(dmit)2]2 are reported. They have similar crystal structures made of stacked Pd(dmit)2 dimers. The mode of the intra-dimer molecular overlapping is that of the eclipsed type. Pd atoms devi…
Two new charge-transfer salts [bettf]2[FeCl4](1) and [bettf][FeBr4](2) have been prepared and crystallised electrochemically [bettf = bis(ethylenedithio)tetrathiafulvalene]. The crystal structures of both salts have been refined in the P space group, the unit-cell parameters being: (1), a= 6.626(2), b= 15.025(2), c= 1…
Recent advances in the methods of structural analysis, in particular the use of particle accellerators to produce pulsed neutrons and synchrotron radiation, have greatly improved our ability to describe the atomic structure of non-periodic matter quantitatively using the atomic pair distribution analysis, or the real-…
Abstract Thin plasma polymerized layers of acrylic acid (PPAA) were deposited onto polyethylene and muscovite mica surfaces. Structure and surface properties of the deposited layer depend on the polymerization conditions. The content of carboxylic groups in the layer decreases, whereas the degree of crosslinking or br…
The characteristics of the high energy product NdFeB magnets obtained by the powder metallurgy route have been improved by appropriate vanadium additions. Specific combinations of V and Co lead to an intrinsic coercive force of about 1350 kA/m (17 kOe) in Dy-free magnets, without any large decrease of remanence. If 1.…