Materials Literature
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We study the anchoring mechanism due to substrate-adsorbed ions by examining a related anchoring transition. An analytical solution to the Poisson equation shows that, as their number suffices for a non-negligible anchoring contribution, the surface field is screened over some characteristic microscopic distance. It i…
The dynamic magnetization reversal behavior of polycrystalline ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ films (thickness 60 and 200 \AA{}) was studied in the temperature range 90--300 K by applying a magnetic field along the easy magnetization axis of the samples. The loop area A is found to follow the scaling relation…
The synthesis and characterization of novel fluorine-containing PMR polyimides derived from the diethyl ester of 4,4‘-(2,2,2-trifluoro-1-phenylethylidene)diphthalic acid, p -phenylenediamine, and the monoethyl ester of cis -5-norbornene- endo -2,3-dicarboxylic acid in low boiling solvents were described. The fluoropol…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTIntramolecular Energy Transfer in 1,3,5-Phenylene-Based Dendritic PorphyrinsMutsumi Kimura, Tetsuo Shiba, Tsuyoshi Muto, Kenji Hanabusa, and Hirofusa ShiraiView Author Information Department of Functional Polymer Science, Faculty of…
Cross-correlation techniques have been used successfully to suppress multiple scattering in dynamic light-scattering experiments on turbid samples. This allows dynamic information to be obtained straightforwardly by processing the remaining single scattering. Here we show that cross-correlation techniques can also be…
We present a self-consistent method for deriving moment equations for kinetic models of polymer dynamics. The Doi model [J. Polym. Sci., Polym. Phys. Ed. 19, 229 (1981)] of liquid-crystalline polymers with the Onsager excluded-volume potential is considered as an example. To lowest order, this method amounts to a simp…
This work deals with the fire retardancy of polypropylene (PP)/thermoplastic polyurethane (TPU)/ammonium polyphosphate (APP) intu mescent blends, using TPU with different chemical compositions and struc tures. The influence of the chemical nature of the polyol used in the synthesis of the TPU on the fire resistance of…
The geometric and electronic structure and the optical, vibrational, and magnetic properties of paramagnetic point defects in ${\mathrm{Si}}_{3}{\mathrm{N}}_{4}$ have been studied by means of ab initio quantum-chemical methods. Using cluster models and gradient-corrected density functional theory or configuration inte…
This work presents an in situ experimental investigation of the shear-induced coalescence mechanism in low concentration polymer blends (1%–10%). An original sizing method based on small-angle light scattering and optical microscopy were used to determine the evolution of the drop size distributions as a function of t…
The degradation of ferroelectric SrBi2Ta2O9 in an H2-containing reducing atmosphere and its recovery by subsequent annealing in oxygen have been reproduced experimentally by using bulk ceramic samples. SrBi2Ta2O9 decomposes into Bi metal and Sr–Ta oxide(s) in H2 above 300 °C, and the decomposition rate increases as th…
Detailed formulas were derived by using Yeh’s formulation of the extended 2×2 Jones matrix and applied to twisted nematic liquid-crystal displays at oblique angles of incidence. Numerical comparisons of this extended Jones matrix method with the exact 4×4 Berreman matrix and with the extended Jones matrix of Lien are…
A new class of porphyrazine macrocycles carrying peripheral diazepine rings, i.e. tetrakis-2,3-(5,7-diphenyl-6H-1,4-diazepino)porphyrazine [Ph2DzPzH2](H2O)4, and its metal derivatives of formula [Ph2DzPzM](H2O)x=2–7 [M = MgII(H2O), CuII, ZnII] have been prepared and characterized. Single crystal X-ray work on the mono…
We investigate the effects of inertia on the hydrodynamics in the microscopic vicinity of moving contact lines. These hydrodynamics control the macroscopic shape and spreading of fluid bodies across solid surfaces. We perform experiments at low capillary number (Ca<0.1) and negligible (10−4) to moderate (Re∼1)…
The photoluminescence (PL) of hydrogenated amorphous carbon nitride films and its behaviors due to ultraviolet (UV) light irradiation and thermal annealing have been investigated. The films were produced using an electron cyclotron resonance plasma with various mixtures of N2 and CH4 gases. The broad PL spectra center…
Abstract Stable carboxylate-functionalized silver nanoparticles (1.4 - 5.7 nm in diameter) which can be separated as pure water-redispersible powder are synthesized by the reduction of silver nitrate with sodium borohydride in the presence of mercaptosuccinic acid (MSA) in methanol. The results show that the particle…
Article Experimental Investigations and Thermodynamic Calculation in the Al-Mg-Sc System was published on November 1, 1999 in the journal International Journal of Materials Research (volume 90, issue 11).
Dissolution kinetics for pits and crevices in aluminum and the effect of dichromate ions on the dissolution kinetics were investigated by using artificial crevice electrodes. The aluminum artificial crevice electrodes were potentiostatically polarized over a range of potential in 0.1 M NaCl solution with and without d…
Polarization tunability and analysis of X-rays is one of the most advancing features of third-generation synchrotron radiation sources. In order to apply such developments to the observation of magnetic effects, a diffractometer for X-ray magnetic absorption and scattering experiments was constructed on BL39XU at SPri…
In process industries coking is an annoying phenomenon, the carbon deposition causes decrease of heat transfer and hinders gas flow. Coking in a process may indicate metal dusting, i.e. the disintegration of metals and alloys in carbonaceous atmospheres under formation of graphite and fine metal particles. The metal p…
The efficiency of imidazole and its derivatives (4-methylimidazole, 4-methyl-5-hydroxymethylimidazole, 1 phenyl-4-methylimidazole, 1-[p-tolyl]-4-methylimidazole) for corrosion inhibition of copper in 0.5 M hydrochloric acid (HCl) was investigated. Corrosion inhibition was studied using impedance spectroscopy and poten…