Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOuter-sphere dissociative electron transfer to organic molecules: a source of radicals or carbanions? Direct and indirect electrochemistry of perfluoroalkyl bromides and iodidesClaude P. Andrieux, Laurence Gelis, Maurice Medebielle, Jean Pinson, and Jean Michel SaveantCite t…
ABSTRACT: We present results of a detailed Monte Carlo simulation study of a system of a large num-ber of polymer chains terminally anchored or end-grafted on a flat surface. We study this system on a three-dimensional lattice for several different values of the surface coverage and the chain length. We also consider…
Fourier transform infrared (FTIR) spectroscopic studies are carried out on different, potentiometric well defined oxidation states of polyaniline in aqueous acidic and organic electrolytes. During the oxidation process ring structures transform from benzenoid into quinoid states. The fully reduced state of polyaniline…
Phase transitions in betaine compounds are reviewed. Some topics are selected for detailed presentation: Effects of reorientation and frustration in the (BA - DBA)-system and the (BA - BP)-system are touched. The (p, T)-phase diagram of BCCD and its relation to the ANNNI- model is discussed at some length. Recent ESR-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of weak polyelectrolytes on highly charged surfaces. Poly(acrylic acid) on polystyrene latex with strong cationic groupsJ. Blaakmeer, Marcel R. Bohmer, M. A. Cohen Stuart, and G. J. FleerCite this: Macromolecules 1990, 23, 8, 2301–2309Publication Date (Print):Apri…
We have applied the method of simulated annealing to the refinement of the 3 A resolution crystal structure of the influenza virus hemagglutinin glycoprotein, using the program X-PLOR. Two different methods were introduced into X-PLOR to treat the non-crystallographic symmetry present in this and in other crystal stru…
A status report is given on the development of thin-film ferroelectric memories, both by sputtering and by sol-gel techniques, integrated onto gallium arsenide or silicon. Emphasis is on lead zirconate titanate (PZT) materials. Progress in ferroelectric materials, electrical characterization, and circuit design is rev…
Abstract A high-charge smectite from Arizona [cation-exchange capacity (CEC) = 120 meq/100 g] and a low-charge smectite from Wyoming (CEC = 90 meq/100 g) were used to prepare homoionic tetra-methylammonium (TMA)-clay complexes. The adsorption of benzene, toluene, and o-xylene as vapors by the dry TMA-clays and as solu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydration or steric forces between amphiphilic surfaces?Jacob N. Israelachvili and Haakan WennerstroemCite this: Langmuir 1990, 6, 4, 873–876Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990https://pubs.acs.org…
Polysynthetically twinned crystals of TiAl with a nearly stoichiometric composition have been grown and deformed in compression at room temperature. The yield stress and deformation behaviour depend strongly on the angle between the twin boundaries and the compression axis rather than on the crystallographic orientati…
Molecular-dynamics simulations of 15 000 and ${10}^{6}$ particles have been performed to study the onset of crystallization in supercooled Lennard-Jones liquids. The calculations were performed by suddenly cooling an equilibrated liquid and calculating the subsequent time evolution of the system (at constant energy an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWeak polyelectrolytes between two surfaces: adsorption and stabilizationMarcel R. Bohmer, Olaf A. Evers, and Jan M. H. M. ScheutjensCite this: Macromolecules 1990, 23, 8, 2288–2301Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published i…
For many years the effects of a static or dynamic electric field upon electronic motion in a molecule have been studied. These effects have been described in terms of multipolar electronic polarizabilities and higher-order hyperpolarizabilities. Much less attention, however, has been paid to the effects of an electric…
Austenitic nickel-base alloys such as alloys 600 (UNS(1) N06600), 690 (UNS N06690), and X-750 (UNS N07750) have been found to be highly susceptible to environmentally-induced intergranular cracking. It is now well established that the structure and chemistry of grain boundaries play an important role in this process.…
The geometry of a random dense packing of disks of equal size obtained by compacting a random sequential adsorption configuration is discussed. The configuration is shown to be without any long-ranged order, and no local configurations of ordered domains were found. The fraction of area covered by disks is \ensuremath…
This book discusses the development of polymeric materials over the last 30 years. The chemist's ability to manipulate structure and tailor the properties of organic materials for specific applications is presented. The phenomenal success of polymer chemistry is addressed. The need for a research base in multiphase po…
It has been found that X‐ray amorphous silica glasses containing up to 18% carbon can be synthesized using a sol/gel process. In this study, the sols were prepared using four different organometallic precursors—methyl‐, ethyl‐, propyl‐, and phenyltrimethoxysilanes. 1 H NMR, 13 C NMR, and TGA revealed that the methoxy…
In this paper we extend the Van der Waals–Cahn–Hilliard theory of phase transitions to the case of a mixture of n non-interacting fluids. By describing the state of the mixture as given by a vector density function u = (u_1, …, u_n) , the problem consists in studying the asymptotic behaviour as \mathrm{\varepsilon }\r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal degradation of microbial copolyesters: poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and poly(3-hydroxybutyrate-co-4-hydroxybutyrate)Masao Kunioka and Yoshiharu DoiCite this: Macromolecules 1990, 23, 7, 1933–1936Publication Date (Print):April 1, 1990Publication Histor…
A new methodology in computational micromechanics, dislocation dynamics (DD), is introduced. Dislocation dynamics is developed for examining the dynamic behavior of dislocation distributions in solid materials. Under conditions of externally applied stress, dislocations exhibit glide with a velocity proportional to a…