Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcid salts and the structure of ionomersMichael M. Coleman, Joon Y. Lee, and Paul C. PainterCite this: Macromolecules 1990, 23, 8, 2339–2345Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990https://pubs.acs.org/…
The dynamic organization of dislocations into spatially heterogeneous substructures is demonstrated by applying the principles of dislocation dynamics that were outlined in the preceding paper. Here it is shown that the formation of persistent slip bands is a consequence of the competition between dipole formation and…
We generalize the Chen-Lubensky model for the point where the nematic, smectic-A, and smectic-C liquid-crystalline phases meet (the NAC point) to include the effects of molecular chirality. We calculate the phase diagram for this model when the possibility of a twist-grain-boundary (TGB) phase is included and when it…
Abstract The reduction and reoxidation of three nontronite samples, GAN (API H-33a, Garfield, Washington), SWa-1 (ferruginous Washington smectite), and NG-1 (Hohen Hagen, Federal Republic of Germany) were studied with visible absorption and Mössbauer spectroscopy. The intensity of the intervalence electron transfer (I…
Microcomposite membranes were produced via the in situ diffusion-controlled, acidcatalyzed sol-gel reaction for tetraethoxysilane in prehydrated and methanol-swollen Nafion perfluorosulfonic acid films. The thermal behavior of these microcomposites was investigated using thermogravimetric analysis (TGA) and differenti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelative electron donor strengths of tetrathiafulvene derivatives: effects of chemical substitutions and the molecular environment from a combined photoelectron and electrochemical studyDennis L. Lichtenberger, Roy L. Johnston, Klaus Hinkelmann, Toshiyasu Suzuki, and Fred Wu…
Other| April 01, 1990 The genus Ammonia Bruennich, 1772; its geographic distribution and morphologic variability William R. Walton; William R. Walton Northwestern University, Department of Geological Sciences, Evanston, IL, United States Search for other works by this author on: GSW Google Scholar Benjamin J. Sloan Be…
The influence of small amounts of copper on the neutron-irradiation-induced embrittlement of reactor pressure vessel steels is of considerable current interest. Previous work has shown that the embrittlement is associated with the formation of copper-rich precipitates, but uncertainties remain regarding their composit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGadolinium complexation by a new diethylenetriaminepentaacetic acid-amide ligand. Amide oxygen coordinationMark S. Konings, William C. Dow, David B. Love, Kenneth N. Raymond, Steven C. Quay, and Scott M. RocklageCite this: Inorg. Chem. 1990, 29, 8, 1488–1491Publication Date…
ABSTRACT: It is demonstrated that densely cross-linked polymer networks with a helicoidal order in the nematogenic bridging units can be created by photoinitiated polymerization of liquid-crystalline diacry-lates containing a chiral dopant. The natural pitch of the monomeric mixture is controlled by the dopant concent…
A reaction kinetic study of the formation of mullite from single‐phase aluminosilicate gels has been performed using dynamic X‐ray diffraction. In situ measurements of conversion and separate infrared spectra data indicate that the amorphous single‐phase precursors form crystalline mullite at temperatures as low as 12…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal- and light-induced spin transition in [Fe(mtz)6](BF4)2: first successful formation of a metastable low-spin state by irradiation with light at low temperaturesP. Poganiuch, S. Decurtins, and P. GuetlichCite this: J. Am. Chem. Soc. 1990, 112, 9, 3270–3278Publication D…
We have studied the room temperature optical reflectivity of MgO, MgAl 2 O 4 , and α-Al 2 O 3 from 5 to 40eV using a novel spectrophotometer with a laser plasma light source. Structure in the imaginary component of the dielectric response is analysed using critical point line shapes, and the origins of the major trans…
We consider the impact of shear flow on the isotropic-nematic transition in crystalline liquids by generalizing Leslie-Ericksen dynamics of nematic systems to include amplitude and biaxial degrees of freedom. Neglecting fluctuations, we find steady-state solutions to the equations of motion for the nematic order param…
In this paper we discuss some of the measurements and properties of materials that are crystalline ferroelectrics with a glassy polarization phase. We review measurements of the temperature dependence of the optical index of refraction, n(T), which were first used to observe these properties. Then we discuss a model o…
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…