Materials Literature
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Abstract Rubber reinforcement of silicas with different surface alkylation have been evaluated by studies of NH 3 -modified swelling, swelling volume fraction, stress-strain tests, and scanning electron microscopy. Effects of silica alkylation on filler dispersion has been explained on the basis of surface energy and…
phaZPfi, the gene encoding the extracellular poly(3-hydroxyoctanoic acid) depolymerase of Pseudomonas fluorescens GK13, was cloned, sequenced, and characterized. It comprises 837 bp and is transcribed as a monocistronic message of about 950 bp from a putative sigma 70-like promoter 32 bp upstream of the ATG start codo…
The interaction of poly(3‐hexylthiophene), P3HT, with oxygen has been investigated. Evidencein the form of UV–vis absorption, electron paramagnetic resonance data, and a field effect conductivity analysis of a polymer‐based field effect transistor–is presented for the existence of a reversible charge transfer complex…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of Roading AsphaltsPhilip R. Herrington, John E. Patrick, and George F. A. BallCite this: Ind. Eng. Chem. Res. 1994, 33, 11, 2801–2809Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://doi…
Coherent arrays of refractive micro-optics are fabricated in the surface of silicon using a combination of lithographic and reactive-ion etching (RIE) techniques. The aspheric profile can be approximated in a stepwise manner by iterative steps of photolithography and RIE (binary optics technology), by direct etching o…
The recent serial section electron microscopic studies by Adamson and Michel (1993) on microves gels of frog mesentery have revealed that the large pores in the junction strand of the interendothelial cleft are widely separated 150 nm wide orifice-like breaks whose gap height 20 nm is the same as the wide part of the…
We present a solution of a modified time-dependent Ginzburg-Landau equation in the limit of infinite order-parameter dimension N. The scalar (N=1) model is believed to describe phase separation in chemically reactive binary mixtures, block copolymers, and other systems where competing short-range and long-range intera…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst Observation of a n-Doped Quasi-One-Dimensional Electronically-Conducting Discotic Liquid CrystalNeville Boden, Ruth C. Borner, Richard J. Bushby, and Jonathan ClementsCite this: J. Am. Chem. Soc. 1994, 116, 23, 10807–10808Publication Date (Print):November 1, 1994Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of Porphyrin Ring Distortion on Redox Potentials of .beta.-Brominated-Pyrrole Iron(III) TetraphenylporphyrinsKarl M. Kadish, Francis D'Souza, Anne Villard, Marie Autret, Eric Van Caemelbecke, Paola Bianco, Alessandra Antonini, and Pietro TagliatestaCite this: Inorg. C…
A magnetic polymer composite containing γ‐Fe 2 O 3 nanoparticles and prepared from poly(pyrrole‐ N ‐propylsulfonate) by a simple reaction with aqueous NH 4 OH is described. The results of physical characterization by X‐ray powder diffraction and an investigation of the magnetic properties are presented. Such composite…
DSC and X-ray diffraction studies on a series of 1,3-phenylene bis[4-(4-alkoxyphenyliminomethyl)benzoates] are presented. The only mesophase exhibited by the methoxy to hexadecyloxy homologues is of the smectic C type. The reversal of the iminomethyl linkage reduces drastically the incidence of a mesophase; that is, o…
In this paper we introduce a new method for proving area-minimization which we call "paired calibrations." We begin with the simplest application, the cone over the tetrahedron, which appears in soap films. We then discuss immiscible fluid interfaces, crystal surfaces, and one-dimensional networks minimizing other nor…
A pedagogical presentation of the propagation of electromagnetic waves in stratified media is given. The usual 2 × 2 matrix analysis is simplified and generalized. A Bloch factor eigenvalue equation is obtained, valid for all periodic stratifications. The implications of the band structure of an infinite periodic stru…
A new ordered state characterized by non-zero toroidal moment density is described. A review of its electrical and magnetic properties is presented. A second order phase transition to the toroidal state is accompanied by Curie-Weiss behavior of a new type of response function, the toroidal susceptibility, which descri…
An atom is defined as a region of space bound by a surface of local zero flux in the gradient vector field of the electron density. The same boundary condition defines a proper open system, one whose observables and their equations of motion are defined by quantum mechanics. Applied to a crystal, this boundary conditi…
Abstract The existing models based on classical nucleation theory are not able to explain satisfactorily the nucleation phenomenon of microcellular foams in thermoplastics. Here, we extend the analysis of Kweeder (24), who developed a new model that considers the presence of microvoids, resulting from the thermal proc…
With a view to verifying the symmetry of the antiferromagnetic phase of LiCoPO4 crystals, quasi-static and dynamic magnetoelectric (ME) experiments have been undertaken by means of magnetic field induced polarization (MEH effect). After magnetoelectric annealing all nine components of the ME tensor have been tested at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiamagnetic and Paramagnetic Keggin Polyoxometalate Salts Containing 1-D and 3-D decamethylferrocenium Networks: Preparation, Crystal Structures and Magnetic Properties of [Fe(C5Me5)2]4(POM)(solv)n (POM = [SiMo12O40]4-, [SiW12O40]4-, [PMo12O40]4-, [HFeW12O40]4-; solv = H2O,…
ac and dc conductivities of fast-ion conducting x${\mathrm{Na}}_{2}$S+(1-x)${\mathrm{B}}_{2}$${\mathrm{S}}_{3}$ glasses in the composition range 0.001\ensuremath{\le}x\ensuremath{\le}0.1 were analyzed using the Almond-West formula \ensuremath{\sigma}(\ensuremath{\nu})=${\mathrm{\ensuremath{\sigma}}}_{\mathrm{dc}}$[1+(…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFTIR Identification of the Supported Phases Produced in the Preparation of Silica-Supported Nickel CatalystsM. Kermarec, J. Y. Carriat, P. Burattin, M. Che, and A. DecarreauCite this: J. Phys. Chem. 1994, 98, 46, 12008–12017Publication Date (Print):November 1, 1994Publicatio…