Materials Literature
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A new method of the formation of composite polypyrrole films containing a highly dispersed three‐dimensional array of platinum catalyst particles is presented. PtCl 4 2 − anions were trapped inside the polypyrrole matrix during the electropolymerization of pyrrole. In the next step followed by solution exchange, PtCl…
Monodisperse gold–polypyrrole nanocomposites, consisting of a gold nanocrystal surrounded by a shell of polypyrrole, are shown to be stabilized by diblock copolymer micelles. Annealing thin films of the gold–polypyrrole-loaded micelles above the glass transition temperature yields compact gold particles encapsulated b…
A SiO2 material with the lowest framework density (15.4 SiO2 nm–3) and the largest void volume fraction (nearly 50%) ever reported for crystalline silica polymorphs has been synthesised, and its structure solved by direct methods and fully refined using low-resolution powder X-ray diffraction data.
Chemical schemes for the preparation of direct band-gap semiconductor quantum dots have advanced rapidly over the past few years. It is now possible to prepare a variety of III–V semiconductors with a finite size (InP, InAs, GaAs, etc.) and compare their size-dependent properties with the well studied II–VI class of q…
The field of long-circulating microparticulate drug carriers is reviewed. The protective effect of certain polymers including poly(ethylene glycol) on nanoparticulate carriers (liposomes, nanoparticles, micelles) is considered in terms of statistical behaviour of macromolecules in solution. Using liposomes as an examp…
A polyester polyurethane (PUR)-degrading enzyme, PUR esterase, derived from Comamonas acidovorans TB-35, a bacterium that utilizes polyester PUR as the sole carbon source, was purified until it showed a single band in sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). This enzyme was bound to the ce…
Tin sulfide-based materials can exist in many forms, ranging from discrete molecular species, to 1D chains, 2D dense and porous sheets and 3D open frameworks. The local coordination geometry around a tin center may vary from trigonal pyramidal, to tetrahedral, trigonal bipyramidal and octahedral, and around sulfur fro…
The deposition of cadmium sulfide by chemical bath methods is straightforward and involves an alkaline solution of a cadmium salt, a complexant and a chalcogen source, often thiourea or thioacetamide. Supersaturation of the bath with respect to ‘Cd(OH) 2 ’ is necessary for the deposition of good quality films under a…
There has been extensive research on drug delivery by biodegradable polymeric devices since bioresorbable surgical sutures entered the market two decades ago. Among the different classes of biodegradable polymers, the thermoplastic aliphatic poly(esters) such as poly(lactide) (PLA), poly(glycolide) (PGA), and especial…
This paper reviews the recent understanding of the initiation mechanisms of electrical trees and the phenomena occurring during the induction period in the discharge free condition. The importance of charge injection in electrical tree initiation is well established, not only under dc or impulse stresses, but also und…
A general class of multipolar molecules is introduced in the context of quadratic nonlinear optics by way of extension of the more specific cases of dipolar and octupolar molecules. An adequate irreducible tensor formalism permits us to define rotationally invariant molecular features that couple to corresponding fiel…
We present molecular-dynamics simulations of the thermal glass transition in a dense model polymer liquid. We performed a comparative study of both constant volume and constant pressure cooling of the polymer melt. Great emphasis was laid on a careful equilibration of the dense polymer melt at all studied temperatures…
"Magnesium Alloys and their Applications." Materials Technology, 13(3), pp. 121–122
Mechanically challenged tissue‐engineered organs, such as blood vessels, traditionally relied on synthetic or modified biological materials for structural support. In this report, we present a novel approach to tissue‐engineered blood vessel (TEBV) production that is based exclusively on the use of cultured human cell…
The kinetics of the γ-radiolytical or chemical reduction of AuIII Cl4-, or of the combination of both methods, is followed as a function of the experimental conditions through the time evolution of the surface plasmon spectrum of the gold nanoparticles formed or of their sizes as observed by AFM imaging. It appears fr…
Large-amplitude negative holographic surface-relief gratings are optically induced by resonant visible exposure in azobenzene dye-containing polymers. We propose a simple diffusion model accounting for the essential dynamic features of surface-relief grating formation. It accounts for intensity and polarization depend…
Tool Steels, Fifth Edition provides tutorial explanations along with engineering data on the production, selection, and use of tool steels and related materials. The first six chapters cover topics of a general nature including tool steel classifications and selection factors, primary production processes, the effects…
Fire Retardancy of Polymeric Materials: Strategies Intumescence - Mechanism Studies New Intumescent Polymeric Materials Flame Retarded Intumescent Textiles Intumescence - an Environmentally Friendly Process? Subject Index.
A device for the electrostatic transport and manipulation of liquid droplets on a solid surface is described. Arrays of microelectrodes are fabricated on a substrate, which is covered by a hydrophobic layer. Water droplets, typically a microliter in volume, take spherical shape on the surface and are caused to move by…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCarbon Nanotube Tips: High-Resolution Probes for Imaging Biological SystemsStanislaus S. Wong, James D. Harper, Peter T. Lansbury,, and Charles M. LieberView Author Information Department of Chemistry and Chemical Biology Harvard University, 12 Oxford Street Cambridge,…