Materials Literature
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Abstract The synthesis of poly(2,5‐dialkoxy‐ p ‐phenylene)s (PPP) by palladium‐catalyzed polycondensation of 2,5‐dialkoxy‐4‐bromophenylboronic acids is described. Number‐average degrees of polymerization of ca. 30 have been reached at best. The characterization of the polymers by NMR, IR, UV‐VIS and fluorescence spect…
Novel monomeric, oligomeric, and polymeric charge‐transfer complexes with interesting electrical conductivity properties and even exhibiting superconductivity are expected to be obtainable by the systematic chemical modification of extended tetrathiafulvalenes (see Figure for one example). The synthesis and cyclic vol…
Abstract Dicopper(II) hydroxide tris(pyrazolide)s Cu2(OH)(4-Xpz)3 (pz = pyrazolide ion; X = H, CH3, Cl, Br) and Cu2(OH)(4-Xpz)3(4-XpzH)2 (X = Cl, Br) were prepared and characterized by means of magnetic susceptibility and IR spectroscopy. Their magnetic-moment values increased in the substituent sequence X = CH3 &…
Abstract Compounds based on poly(vinyl chloride) (PVC), and containing CaCO 3 filler and trifunctional acrylic crosslinking agent have been crosslinked by exposure to γ‐rays at dosages to 70 kGy. The crosslinking agent was found to be essential for crosslinking to proceed, only minor sensitivity to the irradiation hav…
Five copper‐nickel alloys with nickel contents ranging from 0 weight percent (w/o) to 100 w/o were electrochemically investigated in sulfide polluted seawater (0 to 100 ppm S = ). In addition a chromium modified copper‐nickel alloy (CDA 722) was also investigated. The purpose of this research is to investigate the eff…
Abstract Kaolinite was hydrothermally synthesized from two kinds of silica-alumina gels to examine the effect of the structure of the starting material. Two kinds of gels were prepared by precipitation at different pH conditions (pH = 9.6 and 4.2) from solutions containing water glass and aluminum sulfate. Na ions in…
Advanced polymer/nanoparticle composites are currently of great interest because of their unique properties. The bulk properties of these materials are strongly influenced by the nature of the ultrafine filler particles–including their dispersion. A technique is presented for the de‐agglomeration of chemically synthes…
Prebreakdown phenomena in n-hexane are observed in detail for positive and negative polarities by using simultaneously a high speed schlieren technique and an LED current measuring system, when an impulse voltage (1.1/225 /spl mu/s) is applied to a point-to-plane electrode gap. Furthermore, the effects of several addi…
Abstract Recent pedological evidence of the widespread distribution of beidellites in soils indicates the need for a greater knowledge of the effect of charge location on the microstructural organization of Na + smectite in gels. After equilibration at a suction pressure of 3.2 kPa before and after desiccation, TEM ob…
Summary Köhler illumination is the most favourable design for the illumination path of an electron microscope with a condenser objective lens. The new illumination system of the EM 910 and EM 912 OMEGA allows both wide area (Köhler) illumination for TEM operation and spot illumination for analytical investigations. Co…
The optical-absorption transitions originating from the lowest 4f5d excited state of ${\mathrm{Pr}}^{3+}$ in ${\mathrm{Y}}_{3}$${\mathrm{Al}}_{5}$${\mathrm{O}}_{12}$ have been studied. The experimental arrangement uses a 7-ns 266-nm light pulse to populate the lowest 4f5d state, and a spatially overlapped, time-sequen…
Abstract The effects of crystallinity, orientation, and short‐fiber filler on the thermal diffusivity D and thermal conductivity K of poly (ether ether ketone) (PEEK) have been studied. Below the glass transition, D increases by less than 10% as the crystallinity increases from 0 to 0.3. For amorphous PEEK, there is a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMaterial Consisting of Two Interwoven 4-Connected Networks: Hydrothermal Synthesis and Structure of [Sn5S9O2][HN(CH3)3]2John B. Parise and Younghee KoCite this: Chem. Mater. 1994, 6, 6, 718–720Publication Date (Print):June 1, 1994Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParamagnetic Interactions of Triplet Radical Pairs with Nitroxide Radicals: An "Antiscavenging" EffectEugene N. Step, Anatolii L. Buchachenko, and Nicholas J. TurroCite this: J. Am. Chem. Soc. 1994, 116, 12, 5462–5466Publication Date (Print):June 1, 1994Publication History P…
SrTiO 3 films in the 100‐nm thickness range were grown on Ti foils by a 2–4 h hydrothermal treatment at 225°C in an aqueous solution of Sr(OH) 2 . X‐ray diffraction showed the principal reflections of cubic SrTiO 3 . Photoelectron analysis revealed the presence of carbon contamination and suggested the presence of hyd…
The magnetostrictive mini-actuator (MMA), with its unique characteristics such as large strain, high force and high energy density, is potentially a new class of actuator most suitable for distributed actuator applications such as vibration control of smart structures. The authors present a theoretical framework, vali…
High‐resolution neutron powder diffraction was used to study the residual stresses in Al 2 O 3 ‐ZrO 2 (12 mol% CeO 2 ) ceramic composites containing 10, 20, and 40 vol% ZrO 2 (CeO 2 ). The diffraction data were analyzed using the Rietveld structure refinement technique. The analysis shows that for all samples, the CeO…
A polymer chain under good solvent condition near a short-range attractive impenetrable wall (xy plane) is investigated by dynamic Monte Carlo simulation using the bond-fluctuation model. For the statics, the adsorption transition is clearly observed and the adsorption transition temperature, ${\mathit{T}}_{\mathit{a}…
The characteristic morphology of tetrapod-shaped ZnO particles grown by oxidizing zinc vapour in air has been thoroughly interpreted by a growth process from octahedral multiple-twin embryos. The origin of the tetrapod-shape arises from firstly the formation of octahedral multiple twins due to the small c/a ratio of w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Polystyrene Having an Aminoxy Terminal by the Reactions of Living Polystyrene with an Oxoaminium Salt and with the Corresponding Nitroxyl RadicalEri Yoshida, Takashi Ishizone, Akira Hirao, Seiichi Nakahama, Toshikazu Takata, and Takeshi EndoCite this: Macromolec…