Materials Literature
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During heating of semicrystalline PET, a metastable melt forms far below the equilibrium melting temperature. Crystallization kinetics of this metastable melt is discussed on the basis of DSC results. From the metastable melt almost one-dimensional growth of the crystal occurs through heterogeneous nucleation.
The results of the temperature dependence of dc conductivity, microwave dielectric constant, X-ray diffraction, EPR, and NMR experiments are reported for chemically synthesized polypyrrole films soluble in organic solvents. The temperature dependence of dc conductivity of these systems follows the three-dimensional va…
Potential-energy surfaces for various channels of the HNO+NO2 reaction have been studied at the G2M(RCC,MP2) level. The calculations show that direct hydrogen abstraction leading to the NO+cis-HONO products should be the most significant reaction mechanism. Based on TST calculations of the rate constant, this channel…
A highly branched form of polymethylsilane (PMS), -[MeSiH] x [MeSi] y -, has been synthsesized and successfully processed into infusible precursor fibers ca. 30-100 µm in diameter. These precursor fibers were converted into stoichiometric, nanocrystalline SiC fibers, 20-70 µm in diameter, by pyrolysis in an inert atmo…
We have grown epitaxial (0001)-oriented films of the ferromagnetic intermetallic compound MnSb on GaAs(111) substrates. The ex situ grown samples can be reprepared in such a way that clean, ordered, and magnetically saturated surfaces are obtained. Using spin-resolved photoemission, $\mathrm{Sb}5p$- and $\mathrm{Mn}3d…
Novel functionalized polystyrenes having groups such as epichlorohydrin, epoxy, acetyl, C=C double bond, and carboxyl were synthesized by the reaction of polystyrene with epichlorohydrin, unsaturated hydrocarbons, and organic anhydrides in the presence of Lewis acid catalysts. The adhesion capability and corrosion res…
The XPS spectra of Boehmite were collected with a VSW HA150 using monochromatic Al Kα x-radiation. Monochromatic radiation provides a distinct clarity to the peak structure in the valence band of Boehmite due to the absence of interfering x-ray satellites from the intense O 2s region. Variations in the intensities and…
We report the temperature dependence of the frequencies of two high-frequency intramolecular modes in $\ensuremath{\kappa}\ensuremath{-}({\mathrm{B}\mathrm{E}\mathrm{D}\mathrm{T}\ensuremath{-}\mathrm{T}\mathrm{T}\mathrm{F})}_{2}{\mathrm{Cu}[\mathrm{N}(\mathrm{CN})}_{2}]\mathrm{Br}$ measured by resonant Raman scatterin…
Influence of tableting conditions on sticking was investigated using two formulations, the one formulation containing ibuprofen (formulation A) and the other being the standard formulation (formulation B). Sticking was observed on formulation A, and was not observed on formulation B. The degree of sticking was decreas…
The 38th General Meeting of the German Colloid Society was held at the University of Essen, Germany, from September 29th to October 2nd, 1997. The selection of papers presented in this volume covers a
Pore size estimation of materials, whose surface areas and volumes are so small that nitrogen adsorption cannot be measured, is investigated by applying krypton adsorption at 77K. The krypton adsorption-desorption isotherms at 77K on the porous silicas whose pore radii are in the range of 1.36 to 5.20nm showed capilla…
Influence of space charge on dc tree propagation is studied using many insulating polymer materials under divergent fields. The inception voltage and the propagation of dc treeing are affected strongly by space charge. Space charge formation in polymers was observed directly by using thermally stimulated current (TSC)…
The XPS spectra of argon ion etched aluminum metal were collected with a VSW HA150. This spectrometer is equipped with monochromatic Al Kα x-radiation, a 16 channel multichannel detector, and an electrostatic hemispherical analyzer with a radius of 150 mm providing an instrument with exceptional capabilities. We repor…
An anodic stripping voltammetric determination of lead ions in laboratory prepared solutions is described utilizing a poly(vinylsulfonate)-doped polyaniline modified glassy carbon electrode. The experimental signals observed were similar to those of typical stripping methods and showed excellent linearity within the m…
Lanthanum fluoride thin films were prepared on silica glass substrates by a sol-gel method using trifluoroacetic acid (TFA) as a fluorine source. A coating solution was produced from lanthanum acetate and trifluoroacetic acid dissolved in 2-propanol. Triuoroacetate gel films were formed by spin coating the sol, which…
Sawdust of rubber wood has been subjected to surface modification by treatment with sodium polysulphide. The product exhibits a good adsorption potential for Co(H). The percentage of Co(H) adsorption increases with increase in temperature and decrease in initial Co(H) concentration. Sorbent is effective for the quanti…
Abstract We present a combination of electrochemical methods, i.e. polyelectrolyte titration and streaming potential measurement, and AFM to characterise the adsorption and desorption behaviour and the morphology of a set of polyquaternium polymers on human hair. Specific charge density and molar mass are correlated t…
In this paper, the authors introduce the concept of generalized differential matrix operators (GDMOs) that are useful for the formulation of electromagnetic boundary value problems in arbitrary orthogonal coordinate systems, e.g., Cartesian, cylindrical and spherical. The most significant attribute of the GDMO approac…
The reaction between sulfur and sodium carbonate at 350 °C has been investigated, and the products of the reaction have been identified at room temperature by using IR and Raman spectroscopies. The reaction is a disproportionation of sulfur in sodium thiosulfate (oxidized species) and in a polysulfide (reduced species…
Aluminum bronze which has high corrosion resistance, high strength and easy castability is recently expected as a new plastic mold or a shell mold core material in place of steel conventionally used. On the other hand, it is reported that the EDMed surface with metal powder mixed fluid has smaller surface roughness an…