Materials Literature
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The interaction of N-(p-methoxy-o-hydroxybenzylidene)-p-aminopyridine(I) and N-(p-methoxy-o-hydroxybenzylidene)-m-aminopyridine(II) with certain p-alkoxybenzoic acids results in the formation of liquid crystals. Specifically, as established by optical microscopy, DSC and X-ray diffraction studies, complexes of I with…
Based on the fact that the Al 3 Mn phase is closely related to the Al-Mn decagonal quasicrystal, three subunits of the Al-Mn decagonal quasicrystal are deduced from the structure of the Al 3 Mn phase. The existence of these subunits is confirmed by the high-resolution electron microscopy image of the Al-Mn decagonal q…
Abstract Hybrid biomaterials derived from a water‐soluble derivative of polypyrrole, poly(sodium 4‐(3‐pyrrolyl)butanesulfonate), and soluble collagen have been synthesized by chemical polymerization of the 4‐(3‐pyrrolyl)butanesulfonate monomer in a collagen solution. Interaction between the two polymers was evident in…
Existing colorimetric methods for determining phosphorus (P) in citrate‐bicarbonate‐dithionite (CBD) extracts from soils and sediments require pretreatments of extracts prior to the determination of the element. A method is proposed for the determination of P in CBD extracts without any chemical treatments. Maintainin…
Molecular dynamics simulations of the time-correlation functions that appear in the Green–Kubo expression for the shear viscosity are reported for liquid argon over a wide range of densities. The potential part of the microscopic stress tensor is separated into contributions due to the repulsive and attractive branche…
Abstract Conjugated polyanilines bearing long alkyl side chains (dodecyl PANi‐12 and octadecyl PANi‐18) were prepared for the purpose of obtaining well‐mixed conducting polymer blends with insulating flexible polymers. The miscibility of the polyanilines and ethylene‐ co ‐vinyl acetate copolymers (EV A20 with 20 wt %…
Electron microdiffraction experiments have been used to study a fine metastable precipitate (designated X) that forms as platelets on the [111]α planes of the alloy Al-2.5 wt% Cu-1.5 wt% Mg-0.5 wt%Ag, aged at 513 K. Microdiffraction patterns observed from individual platelets indicated that they have a hexagonal struc…
Abstract Perovskite structured strontium cerate doped with ytterbium and water, e.g. SrCe 0.95 Yb 0.05 H 0.02 O 2.985 , is a well known proton conductor at elevated temperatures. We have studied its proton conductivity or diffusivity, respectively, by impedance spectroscopy, IS, and by quasielastic neutron scattering,…
The partial discharges produced by internal defects in solid insulation have been investigated using the ultra high frequency (UHF) technique. The work has shown that the discharges produced by a virgin cavity generate a UHF signal that may be detected using this UHF technique. The discharges are observed as a series…
ABSTRACT Extracellular polymeric substance (EPS) secretion was examined in the stalked marine diatom Achnanthes longipes Ag. in defined medium. This common biofouling diatom exhibited an absolute requirement for bromide for stalk production and substratum attachment, whereas elevated iodide concentrations in the growt…
A stack of seven 15 μ thick polyvinlyl alcohol (PVA) foils was irradiated with 16 MeV electrons. In order to allow for the electrons’ slowing-down until stopping, six 5 mm thick Al plates had been inserted in between these PVA foils. The fractional depth distribution of the PVA destruction is derived from the change i…
Results are presented which demonstrate the existence of unambiguous three-dimensional quantum confinement of phonons within crystallites of the II-VI semiconductor CdSe, which were prepared by the method of diffusive growth within a doped glass matrix. The confinement was investigated by means of Raman scattering fro…
We study the velocity correlation function of a selected particle in a suspension of interacting Brownian particles. Experimentally, the velocity correlation function can be observed with diffusing wave spectroscopy. The function has also been determined in computer simulation. We assume a wide separation of time scal…
DC, AC electrical resistivity (ρdc and ρac (ω) and dielectric properties (ε' and tan δ) were studied for Zn0.8Co0.2Fe2O4 ferrite samples prepared at sintering temperatures (Ts) in the range 1273 to 1473 K by the usual ceramic technique. The experimental results indicated that the DC and AC electrical resistivity, Curi…
Abstract A methodology of predicting novel target high‐energy compounds has been developed. A formalized approach to computer generation of structural isomers starting from previous optimized gross formula has been elaborated on the joined basis of the graph theory, molecular crystal structure modeling methods and qua…
Two new six-ring double-swallow-tailed mesogens were prepared. The phase behaviours of these compounds were studied by optical methods and by calorimetry. One of them shows the very unusual phase sequence crystalline-smectic C-cubic-isotropic-nematic-isotropic.
A pure-bending apparatus is used to measure the constitutive relationship between applied pure bending moments and the resulting curvatures of a few superelastic alloy wires. The sample nickel-titanium alloy (NiTi) wires change phase when ample bending moments are imposed. Like the material’s uniaxial tension stress-s…
In this paper, a model that describes the transient heating of a thin wire causing the tip to melt, roll-up of the molten mass into a ball due to surface tension forces, and the subsequent solidification of the molten material due to conduction up the wire and convection and radiation from the surface, has been provid…
Abstract The molecular interactions of poly(vinylchloride) (PVC) with some solvents [cyclohexanone (CH), methyl ethyl ketone (MEK) and N ‐methylpirrolidone (MP)], esters [dioctylphthalate (DOP) and butyl stearate (BuSt)], and polyesters [poly(ethylene adipate) (PEA) and poly(ε‐caprolactone) (PCL)] have been investigat…
The paramagnetic and optical properties of sixfold coordinated ${\mathrm{Zr}}^{3+}$ ions (T centers) in x-ray-irradiated yttria-stabilized zirconia have been investigated. We propose the attribution of the optical absorption to intracenter transitions as suggested by optical bleaching experiments. Wave functions and e…