Materials Literature
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Graft polymerizations of methyl acrylate (MA) onto granular cornstarch were carried out in water with both ferrous ammonium sulfate/hydrogen peroxide (FAS/H2O2) and ceric ammonium nitrate (CAN) initiation. Starch concentrations were 10, 20, and 30% in water, and the amount of MA used was either 0.5, 1, or 2 mol per AG…
In-situ Cd K-edge EXAFS analysis of colloidal CdS nanocrystallites (CdS-DMF, mean diameter 3.5 nm, hexagonal) prepared by reacting Cd 2+ and H 2 S in N, N -dimethylformamide (DMF) was performed to clarify their microscopic surface structure in solution. The structure of the [Cd 4 (SC 6 H 5 ) 10 ] 2- cluster (Cd 4 -clu…
The use of molecular and continuum emission spectra from multiple bubble (MB) and single bubble (SB) sonoluminescence (SL) is explored as a probe of bubble temperature during cavitational collapse. It is proposed that molecular and continuum SL arise from different chemical pathways, which occur during discrete interv…
Heat of immersion (Δ H im ) data are frequently used to investigate the surface characteristics of solids. In this study, the relationship between the heat of immersion and the contact angle is established from first principles for hydrophobic powders. The heat of immersion of three fluorinated carbons in water is obt…
Mechanical properties, such as tensile and flexural properties, as well as impact behavior of silver-powder-filled isotactic polypropylene composites were investigated in the composite composition range of 0–5.6 vol% of Ag. Tensile modulus, strength, and elongation at break decreased with incorporation of silver and a…
Variations in the band structures of C60-polymers are studied, when conjugation conditions and the electron number are changed. We use a semiempirical model with the Su-Schrieffer-Heeger type electron-phonon interactions. In the neutral one-dimensional C60-polymer, electronic structures change among direct-gap insulat…
Since the early work on grain boundary relaxation by Kě in 1947, the grain boundary internal friction peaks were mostly measured by the free decay method as a function of temperature. The validity of this procedure is based on the assumption that the grain boundary relaxation. as a rate process, should obey the Arrhen…
Dielectric constant and hysteresis loop measurements have been performed on rare earth doped triglycine sulphate single crystals to characterize the second-order phase transition. In the vicinity of the Curie point, the square of the spontaneous polarization increases linearly with decreasing temperature, and the coer…
Magnetization studies on organic single-crystal superconductors of κ-(BEDT-TTF)2Cu[N(CN)2]Br with the field H parallel to the b axis (perpendicular to the conducting plane) show anomalous field and temperature dependence of vortex pinning in the mixed state. At high temperatures, the magnetization M decays with increa…
The crystal structures of five ω-phthalimidoaliphatic carboxylic acids are reported: 2-phthalimidoethanoic acid, C10H7NO4 (I), 3-phthalimidopropanoic acid, C11H9NO4 (II), 4-phthalimidobutanoic acid, C12H11NO4 (III), 5-phthalimidopentanoic acid, C13H13NO4 (IV), and 6-phthalimidohexanoic acid, C14H15NO4 (V). Hydrogen bo…
This paper presents results of sub-element testing conducted to characterize the effects of survivability features and load rate upon the mechanical properties and failure mechanisms of composite structural details. Laminate and joint sub-element evaluations consisted of strength and toughness testing of open-hole fra…
Ba hexaferrite samples having average particle sizes in the range from the tens up to the thousands of nm have been prepared by using conventional ceramic techniques and the exothermic reaction between Ba and Fe nitrates and oxalic dihydrized acid. The magnetic characterization of these samples included the measuremen…
We have successfully prepared a new nanocomposite magnet consisting of a mixture of a magnetically hard Pr2Co14B phase and a soft Co phase using the technique of melt spinning. The final microstructure with the above phases is formed after annealing the melt-spun ribbons through an intermediate transformation to the m…
The magnetic hardening of melt–spun Sm2Fe17Cx was studied and the coercivity of 4.6 kOe for Sm2Fe17C1.5 alloys was reported a few years ago. Recently, we have succeeded in preparing single-phase compounds of Sm2(Fe, M)17Cx (M=Ga, Al, or Si) with high carbon concentration by arc melting. It was found that the substitut…
The study of photoluminescence band-tail-localized excitons in ${\mathrm{ZrS}}_{3}$ and in its solid solution ${\mathrm{Zr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Hf}}_{\mathit{x}}$${\mathrm{S}}_{3}$ confirms the existence of two polytypes for these one-dimensional materials. Fitting of the spectra, with a mo…
A nematic liquid crystalline cell utilizing a substrate coated with polyvinylcinnamate was subjected to UV polarized light in the presence of a magnetic field. After removing the cell from the field it was found that the pretilt angle was large and both temporally and thermally robust. Irradiation in the absence of a…
Micromagnetic finite element calculations using a magnetic vector potential to treat long-range dipolar interactions describe the interactive magnetization processes which determine the magnetic properties of fine-grained magnetic materials. Micromagnetic models give a quantitative treatment of the correlation between…
The \ensuremath{\pi}-band structure of one-dimensional carbon nanotubes is very special. Their ballistic transport properties are studied theoretically and are found to exhibit rich magnetic-flux-dependent structures. The thermal conductance \ensuremath{\kappa}(\ensuremath{\varphi}) has many step structures caused by…
The ordered structure of at 70 - 75 K has been studied by time-resolved neutron powder diffraction. The ordered superlattice has a structure with approximately four full D sites and one vacant D site in successive (420) planes, which is consistent with previous observations. Several superlattice lines not reported in…
The critical state (Bean) model for superconducting hysteresis is discussed for arbitrary specimen shapes and complex flux distributions. It is demonstrated that this model exhibits the ‘‘wiping out’’ property and ‘‘congruency’’ property of minor hysteresis loops. This leads to the conclusion that the critical state m…