Materials Literature
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The methods of linear and circular statistics are used to derive summary descriptors for a unimodal distribution of torsion angles (r;). The arithmetic methods of normal linear statistics are complicated by the phase restriction - 180 < 7 i ~--- 180 °. Phase adjustments must be made to generate a correct arithmetic me…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnnealing and reorganization of sulfonated polyethylene films to produce surface-modified films of varying hydrophilicityDavid E. Bergbreiter and Konrad KabzaCite this: J. Am. Chem. Soc. 1991, 113, 4, 1447–1448Publication Date (Print):February 1, 1991Publication History Publ…
Abstract The surface free energy components of clay-organic complexes were determined to assess to what extent an organic adsorbate modified the surface properties of the mineral, insofar as the stability of soil aggregates is concerned. Adsorption isotherms for two synthetic, humic acid-like polymers were determined…
Abstract Polyfunctional chloroformates were applied to the polymerization of 2‐phenyl‐2‐oxazoline and 2‐methyl‐2‐oxazoline. The use of a trifunctional initiator, viz. the chloroformate of 2,2‐bis(hydroxymethyl)‐1‐butanol, led to three‐arm star polymers of 2‐oxazolines. Two macromolecular initiators, viz. poly(ethylene…
Clay mineral relative abundances in approximately 450 samples from cores recovered during ODP Leg 117 in the Arabian Sea have been used to examine the paleoclimatic, paleoenvironmental, and tectonic histories of the Indus Fan, Owen Ridge, Oman margin, and adjacent continental source regions. Geographic variations in t…
An electrically erasable memory device is fabricated using a conducting polymer and solid polymer electrolyte. The conductivity of the memory channel consisting of the conducting polymer is controlled by electrochemical doping through the counter (writing) electrode. The channel conductivity was varied by the number o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonaqueous electrochemistry of polypyrrole/polystyrenesulfonate composite films: voltammetric, coulometric, EPR, and a.c. impedance studiesC. Michael Elliott, Alan B. Kopelove, W. John Albery, and Zheng ChenCite this: J. Phys. Chem. 1991, 95, 4, 1743–1747Publication Date (Pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state deuteron and proton NMR of guest and host motions in the Hofmann-type and related benzene clathratesShinichi Nishikiori, Christopher I. Ratclife, and John A. RipmeesterCite this: J. Phys. Chem. 1991, 95, 4, 1589–1596Publication Date (Print):February 1, 1991Public…
A potentiostatic pulse technique was used to study the ingress of hydrogen in titanium (pure and grade 2) in an acetate buffer. Hydrogen ingress did not occur with pure titanium, indicating that the surface oxide is an effective barrier to hydrogen entry. In contrast, the data for Ti grade 2 (UNS(1) R50400) were shown…
Reactions of the electron-rich, homoleptic alkylisocyanide complexes M(R N C) 6 (1a-2b) (1: M = Mo, 2: M = W; a: R = Et, b: R = t Bu) with electrophiles have been studied. A coupling of two isocyanide ligands to a complexed alkyne ligand is observed, when M(R N C) 6 is treated with two equivalents of HX(X = Br, I) and…
Article Alteration of Natural UO2 under Oxidizing Conditions from Shinkolobwe, Katanga, Zaire: A Natural Analogue for the Corrosion of Spent Fuel was published on February 1, 1991 in the journal Radiochimica Acta (volume 52-53, issue 2).
Abstract Hydrothermally kaolinitized muscovite from the Otago schist of Brighton, New Zealand, has been studied by transmission and analytical electron microscopy (TEM and AEM) to determine the mechanism of alteration and to compare reactant-product relations for di- and trioctahedral micas. The muscovite is a primary…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled synthesis of poly(acrylic esters) by aluminum porphyrin initiatorsYasunori Hosokawa, Masakatsu Kuroki, Takuzo Aida, and Shohei InoueCite this: Macromolecules 1991, 24, 4, 824–829Publication Date (Print):February 1, 1991Publication History Published online1 May 200…
A high-resolution ac calorimetric technique has been employed to study the nematic--smectic-${\mathit{A}}_{1}$ (N--Sm-${\mathit{A}}_{1}$) phase transition in liquid-crystal binary mixtures of octyloxyphenyl-nitrobenzoyloxy benzoate (${\mathrm{DB}}_{8}$${\mathrm{ONO}}_{2}$) and decyloxyphenyl-nitrobenzoyloxy benzoate (…
We present an analysis of crystal growth of a pure material from its melt, using a phase field model. This model for a first-order phase transition couples nonconserved order parameter kinetics to thermal diffusion. It has been shown to give unique one-dimensional solutions, with velocity selection. We demonstrate tha…
Polyfunctional silanes were designed to promote the formation of a stable multisilane layer on the silica surface. The hydrolytic stability of polyfunctional silanes at the interface between silica and polymeric resin was investigated using conventional tensile testing. The specimens were immersed in boiling water and…
A fundamental understanding of pancake reactors is necessary for the establishment of process‐property relationships in these systems. Here, a mathematical model of the gas flow, transport phenomena, and growth rate profiles of epitaxial silicon in a pancake reactor is presented and the resulting modeling equations ar…
One of the best one-dimensional small organic conductors is the perchlorate 1 (σ ≤ 677 S cm−1). The corresponding triiodide displays weak metallic conduction; the insulator transition at 45 K is distinctly lower than for TTF-TCNQ. The donor, 1,3,6,8-tetrakis(methylthio)pyrene is easily synthesized in large amounts.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBranching ratios in atomic oxygen (3P) reactions of terminal olefins studied by kinetic microwave absorption spectroscopySeiichiro Koda, Yasuki Endo, Soji Tsuchiya, and Eizi HirotaCite this: J. Phys. Chem. 1991, 95, 3, 1241–1244Publication Date (Print):February 1, 1991Public…
<div class="htmlview paragraph">ϵ-caprolactam was polymerized in the interlayer space of montmorillonite, the clay mineral yielding a nylon-clay hybrid (NCH). X-ray and TEM measurements revealed that each template of the silicate, which was 1 nm thick, was dispersed in the nylon 6 matrix, and that the interlayer…