Materials Literature
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[formula: see text] A simple straightforward synthesis for meso-monosubstituted, beta-unsubstituted porphyrins is reported. Porphyrins of this type are easily prepared by condensation of dipyrromethane, pyrrole-2-carbaldehyde, and the desired aromatic or aliphatic aldehyde. The method can be used for a variety of func…
Abstract The adsorption of metals by clay minerals is a complex process involving different mechanisms, and is controlled by different variables which can interact. The aim of this work was to study the retention mechanisms of Cd on illite. We obtained Cd adsorption isotherms at constant pH, adsorption edges as a func…
A surface modification technique was employed to functionalize electrically conductive polypyrrole (PPY) films with hyaluronic acid (HA). The PPY film was first graft copolymerized with 2-hydroxyethyl acrylate (HEA) and subsequently silanized with (3-aminopropyl)triethoxysilane (ATS) via Si−O bonding with the hydroxyl…
We investigate the transport properties of telescoping carbon nanotubes (TCNT's), where one nanotube slides into the other tube with a larger diameter, through multiband tight-binding theoretical calculations. In armchair TCNT's which consist of armchair nanotubes, since the two ${\ensuremath{\pi}}^{*}$ states of the…
Abstract Manufactured articles of semicrystalline polymers usually have a variation in texture (degree of crystallinity and crystal orientation) as a function of the depth from the external surface. This is often due to the fact that the crystallization process near the surfaces occurs at different conditions and rate…
The effects of changes in the fibre orientation on the mechanical properties of nonwoven composites were investigated through 3-point bending, short beam shear and tensile tests. Oxidized polyacrylonitrile(PAN) carded webs were needle-punched, and then carbonized to fabricate carbon composites with phenolic resin. The…
The stretch film industry has grown at phenomenal rates over the past 6-8 years. During that time, stretch film has evolved from monolayer to three layer and now commonly a five or seven layer product. This film is processed on equipment that varies in size and width along with other technological differences. This pa…
Latex waste products contain rubber hydrocarbon of very high quality, which is only lightly cross linked. Selected wastes such as thread waste and glove waste were modified into processable materials by a novel economic process and thermoplastic elastomers were prepared by blending these modified waste materials with…
Abstract New experimental data with respect to the solubility of natural and synthesized magadiite at elevated temperatures and in alkaline solutions are presented. The results show that the solubility of magadiite increases according to the expression ln(K mag ) = −8146· T (K) −1 − 5.71 from 20 to 100°C ( <mml:math x…
Abstract Quantification of aluminium in the presence of copper is a fundamental problem in XPS analysis due to peak overlap. This article presents and demonstrates the utility of a simple approach to alleviate this difficulty based on measurement of the P : S combination peak area ratio. It is particularly appropriate…
Abstract Polymeric biomaterials, especially new compositions, are often tested for biocompatibility, bioerosion rate or cell growth specificity without regard to the morphological structures introduced during materials processing. It will be shown that in addition to the potential influence on biological response, pro…
We analyze a discrete phenomenological model accounting for phase transitions and structures of polar Smectic-C* liquid-crystalline phases. The model predicts a sequence of phases observed in experiment: antiferroelectric SmC A * –ferrielectric SmC 1 * –antiferroelectric SmC 2 * (three-and four-layer periodic, respect…
The temperature dependence of the conductivity of lanthanum metaniobate was studied on samples heated in air from 100 to 1100°C. The electronic and hole conductivity components were separated by the method of a blocking electrode. The temperature dependence of the electronic conductivity of LaNb 3 O 9 was calculated u…
Abstract Superconducting permanent magnets form a completely new class of permanent magnets. Of course, they must be cooled to 77 K or below. At very low temperatures (24 K) their magnetization can be a factor of 10 higher than that of the best conventional magnets, providing magnetic forces and energies which are up…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSelf-Diffusion of a Rodlike Virus in the Isotropic Phase†Randall C. Cush and Paul S. RussoView Author Information Department of Chemistry and Macromolecular Studies Group, Louisiana State University, Baton Rouge, Louisiana 70803 Cit…
The spectral coverage of porphyrin-based light-harvesting arrays can be enhanced through the use of suitable accessory pigments. Perylene-monoimide dyes can serve as valuable accessory pigments with porphyrins. To investigate the choice of perylene-monoimide and the effects of molecular architecture on light-harvestin…
Forty-two mol percent sulfuric acid is a room-temperature molten salt composed of H-bonded ion pairs H 3 O + −HSO 4 - (8.2 M) and H 5 O 2 + −HSO 4 - (5.4 M), the former breaking primarily below ∼360 °C and the latter, mainly between ∼360 °C and the critical point. These ruptures produce H 2 SO 4 and H 2 O. Iterative v…
Abstract Several kinds of molecules and also polymers are going to be discussed in the present article. Common feature in these molecules and polymers is the possessing of a specific structural part, namely benzofuro–benzofuran. This structure will appear in several molecules and kinds of polymers in the text. A conde…
Abstract It has been reported that for polymer blends with high viscosity ratio (>1), the size of the dispersed particles decreases with increasing volume fraction of the dispersed phase. In order to explain this effect, an equation was derived for the affine deformation of an imaginary plane of the dispersed phase…
A combined thermionic-thermoelectric refrigerator is proposed. The passive metal conductor in a vacuum thermionic refrigerator is replaced by an active p-type thermoelectric element, so that the Peltier cooling power can be exploited. Complete analytic formulas of performances are derived for the two types of thermion…