Materials Literature
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Abstract The interaction of the natural marine polymer chitin and its deacetylated derivative chitosan with chromium has been investigated. The uptake of chromium from aqueous solution was determined from changes in concentration as measured by atomic absorption spectroscopy. The uptake of Cr(III) on chitosan was sign…
Abstract The kinetics of crystallization of solvent‐free poly(vinyl alcohol) were investigated by isothermal crystallization at temperatures of 142–192°C, for up to 18 min. The crystallization isotherms were analyzed by Avrami's theory. The magnitude of the exponent n was almost constant (0.67–0.71) in the range of 14…
A heuristic algorithm is presented for fast and accurate evaluation of complex Hankel transforms of orders 0 and 1. Concepts using linear digital convolution are introduced, where Bessel function evaluations are not required. Related convolution is defined over a set of transforms whose integrands are related algebrai…
Expressions for the incoherent-scattering function and the inelastic-scattering cross-section differential with respect to the solid angle for detection of scattered x rays from atomic, molecular, and condensed-matter targets are derived in the relativistic impulse approximation for Compton scattering. It is shown tha…
Two closely related mRNAs (11.0 and 9.6 kilobases long) for sericin, a cocoon protein other than fibroin, were isolated from the middle silk gland of Bombyx mori. They were shown to be specifically accumulated in this particular part of the gland. Nine genomic clones complementary to the mRNAs were isolated from the r…
Interfacial bonding and stability of gamma-methacryloxypropyltrimethoxysilane with silica surfaces have been studied by means of infrared spectroscopy. The addition of n-propylamine enhances silanization of gamma-methacryloxypropyltrimethoxysilane to silica surfaces in normal aliphatic hydrocarbons, and cyclohexane yi…
Data are presented on several dielectric materials which typically possess varying degrees of pyroelectric response depending largely on the electrical (poling) and thermal (heating) conditioning of the materials. A measurement technique described in the preceding paper was used to analyze these materials. The results…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,4,7-Triazacyclononane-N,N',N''-triacetate (TCTA), a new hexadentate ligand for divalent and trivalent metal ions. Crystal structures of [CrIII(TCTA)], [FeIII(TCTA)], and Na[CuII(TCTA)].bul.2NaBr.bul.8H2OKarl Wieghardt, Ursula Bossek, Phalguni Chaudhuri, Willy Herrmann, Ber…
Coccoliths of the unicellular marine alga Emiliania huxleyi are formed intracellularly in a specialized vesicle. Closely associated with the CaCO 3 crystals of the coccoliths is an acid Ca 2+ ‐binding polysaccharide. The latter is considered to fulfil a regulatory function in CaCO 3 crystallization. In this study it i…
This is the first of two papers wherein a new method is described which allows the analysis and evaluation of electric currents, such as pyroelectric currents and thermally simulated conductivity or currents arising from heated dielectric materials. It is shown for certain temperature and frequency ranges that the ac…
Abstract Blends of poly(vinylidene fluoride) (PVF 2 ) and poly(methyl methacrylate) exhibit complex melting behavior when crystallized at low undercoolings. Three crystals comprised of two different PVF 2 forms grow. Hoffman‐Weeks plots of the observed melting points T m of these crystals versus crystallization temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpimerization of aldoses by molybdate involving a novel rearrangement of the carbon skeletonMichael L. Hayes, Nicholas J. Pennings, Anthony S. Serianni, and Robert BarkerCite this: J. Am. Chem. Soc. 1982, 104, 24, 6764–6769Publication Date (Print):December 1, 1982Publication…
A blazing technique using electron-beam lithography to achieve higher efficiency of gratings and Fresnel lenses is described. Transmission-type blazed gratings have been formed in polymethyl methacrylate films. As a result of measurement, we found that their diffraction efficiency of the first order in these gratings…
Although the Ti-Ni alloy is the most important material for applications, there has been no systematic work on its deformation behavior. In the present report, the effects of ageing, Ni-content and annealing right after cold work on the shape memory effect and on the pseudoelasticity are systematically investigated by…
Surface-enhanced Raman scattering (SERS) due to charge-transfer interactions between the adsorbed molecule and the metal surface is analyzed using the semiempirical Wolfsberg–Helmholz method to relate the molecule–surface interactions and the resulting charge-transfer states to the overlap integrals between the metal…
Calculations reported here show that small gas nuclei in a liquid acted on by microsecond ultrasonic pulses may grow into transient cavities that collapse violently. The maximum pressures and temperatures generated by such collapsing cavities are found in these calculations to be of the order of 1000 to 70 000 bars an…
The internal strains asSociated with the martensitic phase transformation of zirconia were used to introduce microcracks into Al 2 O 3 /ZrO 2 composites. The degree of transformation was found to be dependent on the volume fraction of ZrO 2 and its size, the latter of which could be controlled by suitable heat treatme…
Abstract The boiling 5-M-NaOH treatment was found to aid in the identification and characterization of goethite and hematite by effectively concentrating the two Fe oxides in kaolinitic-gibbsitic soil clays. No transformations of goethite to hematite or hematite to goethite were detected, but poorly crystalline, highl…
Neutron powder diffractometers operating with large vertical counter acceptance angles produce diffraction patterns in which the peaks are shifted and broadened, and may become distinctly asymmetric. It is shown that a sum of Gaussians generally provides a good approximation to these peaks. The sum of Gaussians has be…
A study has been made on improving the adhesion of a glass ionomer cement by the chemical treatment of dentin and enamel surfaces. The most effective surface conditioners were high molecular weight substances containing a multiplicity of functional groups capable of hydrogen bonding. Low molecular weight chelating age…