Materials Literature
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Metallothionein is a cysteine-rich metal-binding protein whose biosynthesis is closely regulated by the level of exposure of an organism to zinc, copper, cadmium, and other metal salts. The metallothionein from Callinectes sapidus is known to bind six divalent metal ions in two separate metal-binding clusters. Heteron…
Metals can exhibit dendritic short-circuits caused by electrochemical migration in conductor-insulator structures, which may result in failures and reliability problems in microcircuits. The classical model of electrochemical migration has been well known for several decades. This process is a transport of metal ions…
The forms of polyaniline, viz. pernigraniline, emeraldine and leucoemeraldine, their mutual transformations and their roles in the chemical polymerization of aniline, are discussed. Absorption spectra of its various protonated forms and corresponding bases are reported. A simple reaction scheme is proposed to account…
The presence of molecular oxygen is a determinant in the phototoxicity of phthalocyanines, and photosensitized oxidation is the accepted chemical mechanism for photo-dynamic action. However, it is difficult to establish whether the process is initiated by a type I electron transfer, or by a type II energy transfer rea…
Volume 1: Polymorphism in polypropylene homo- and copolymers. Molecular structure of polypropylene homo- and copolymers. Crystalline structures of polypropylene homo- and copolymers. Crystallisation, melting and supermolecular structure of isotactic polypropylene. Nucleation of polypropylene. Epitaxial growth on and w…
Fine-particle, sinter-active yttria has been prepared by combustion of a redox compound, Y(N2H3COO)3·3H2O and mixtures of Y(N2H3COO)3·3H2O–NH4NO3 or NH4ClO4 as well as yttrium nitrate and hydrazine-based fuels. The fineparticle nature of the combustion-derived yttria has been investigated using powder density, particl…
Since its discovery the process of mechanical alloying has demonstrated significant potential for the synthesis of materials with novel structures and properties. In this paper recent studies of the application of mechanical alloying to solid state refining processes are reviewed. These studies show that mechanical al…
New antibiotics were isolated from the culture broth of the myxobacterium, Sorangium cellulosum, strain So ce 678. The antibiotics were active against Gram-positive bacteria and mammalian cells. They were named tartrolon A and B. Tartrolon B contains a boron atom. The boron binding region of tartrolon is identical wit…
High-energy mechanical alloying of pure CeO2 and ZrO2 at room temperature results in the formation of a single phase Ce1–xZrxO2 fluorite structured solid solution in all the examined composition ranges; the compounds are characterized by a high oxygen storage capacity and an excellent reducibility.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedox Behavior and Dispersion of Supported Chromium CatalystsBert M. Weckhuysen, Leo M. De Ridder, Piet J. Grobet, and Robert A. SchoonheydtCite this: J. Phys. Chem. 1995, 99, 1, 320–326Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-Bandgap Conducting Polymers Based on Conjugated Poly(heteroarylene methines). 2. Synthesis, Structure, and PropertiesWen-Chang Chen and Samson A. JenekheCite this: Macromolecules 1995, 28, 2, 465–480Publication Date (Print):January 1, 1995Publication History Published…
A series of new mono- and bi-nuclear rhenium(I) complexes, [Re(CO)3(N–N)L]ClO4 and [{Re(CO)3(N–N)}2L′][ClO4]2[where N–N = 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen) and L = 4-phenylazopyridine (phazo), 4-styrylpyridine (stypy), 4-pyridyl-2-ethylbenzene (NB); L′= 4,4′-azopyridine (azo), 1,4-bis(4-pyridyl-2-eth…
Partial discharges (PD) and the way they affect insulation quality has for decades been a rewarding subject for many researchers. There are two topics that are of particular interest to the workers in the field of PD. One is the impact of a wide variety of statistical tools on the interpretation of discharge data obta…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFilm Thickness Dependent Thermal Expansion in Ultrathin Poly(methyl methacrylate) Films on SiliconWen-li Wu, John H. van Zanten, and William J. OrtsCite this: Macromolecules 1995, 28, 3, 771–774Publication Date (Print):January 1, 1995Publication History Published online1 May…
Normal corn starch was extruded with polystyrene or polymethyl methacrylate and blowing and cross-linking agents in a single screw C. W. Brabender laboratory scale extruder at 140 C barrel temperature, 140 rpm screw speed and 16% moisture content. Expansion ratio, unit density, water solubility index, spring index, co…
This work studies the fire degradation of an intumescent for mulation Polypropylene (PP)-Ammonium Polyphosphate (APP)/Pentaerythri tol (PER) using the cone calorimeter. An intumescence model is described which introduces the notion of degradation front. From the weight loss data recorded by the cone calorimeter and th…
We have studied the crystallization, crystal structure, structure morphology, and magnetic properties of R/sub 6/Fe/sub 87/Nb/sub 1/B/sub 6/ with R=Nd, Pr, Dy, Tb and Nd/sub 3.5/Fe/sub 91/Nb/sub 2/B/sub 3.5/ melt-spun ribbons with a microstructure consisting of a mixture of exchange-coupled magnetically hard (R/sub 2/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnzymic Grafting of Amylose from Poly(dimethylsiloxanes)Volker v. Braunmuehl, Gerd Jonas, and Reimund StadlerCite this: Macromolecules 1995, 28, 1, 17–24Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995http…
The concentration range over which a self-assembted macrocyclic structure is stable is given by the critical self-assembly concentration (lower limit) and the effective molarity for cyclisation (upper limit); the relationships between these parameters, the size of the assembly and the properties of the component inter…
To assign infrared (IR) absorption bands related to Si‐H vibrations in porous silicon, harmonic frequencies for model clusters were calculated by an ab initio molecular orbital (MO) method using a 6–31 G * basic set. Vibrations associated with a group of interest can be obtained by terminating the cluster with pseudoa…