Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of electric and magnetic fields on orientational disorder in liquid crystalsDavid A. Dunmur and Peter Palffy-MuhorayCite this: J. Phys. Chem. 1988, 92, 6, 1406–1419Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1…
We present a set of observations of large-angle grain-boundary structures in zinc, obtained by transmission electron microscopy. The necessary formalisms for relating experimental observations to theoretical predictions of the boundary structures are given. Dislocation structures are observed in several boundaries, in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrthometalation of m-bis(dimethylaminomethyl)benzene: crystal structure and chemistry of trans-Rh(III)Cl2[C6H3(CH2NMe2)2-o,o'](H2O)Adolphus A. H. Van der Zeijden, Gerard Van Koten, Ronald Luijk, Kees Vrieze, Cees Slob, Hendrik Krabbendam, and Anthony L. SpekCite this: Inorg.…
Abstract Blends of nylon‐6 and EPDM rubber were prepared by reaction blending to study the influence of rubber concentration, rubber particle size and interfacial adhesion on the impact strength. Rubber particles induce a sharp brittle‐tough transition which is independent of the glass transition of the nylon matrix.…
Keywords: clays ; critical state ; overconsolidation ; state boundary surface ; symmetry ; yield envelopes ; yielding ... Show All
Abstract Binary interaction parameters, X ij have been determined for the monomer pairs, styrene‐acrylonitrile and methyl methacrylate‐acrylonitrile from phase separation measurements in homopolymer‐copolymer blends. These have been used to predict regions of miscibility in different blends of statistical copolymers w…
Abstract not Available.
Zinc- and aluminum-substituted cobalt-ferrite thin films were prepared on fused quartz substrates using vacuum evaporation followed by heat treatment. Magnetic measurements and X-ray diffraction analyses of the films showed that zinc and aluminum were successfully substituted in the spinel lattice and that the Curie t…
The well known, extremely reactive [18]annulene 1 and the hypothetical isomer 2 should be capable of being stabilized by CH2- and CHCH-groups as internal and external bridges, respectively. The corresponding hydrocarbons, 3 and 4, are still unknown, although they are of great interest as links between the non-natural…
The doping and undoping characteristics of alkali‐metal doped polyacetylene are investigated using cyclic voltammetry and complex impedance measurement techniques. Reversibility, charge transfer resistance , double layer capacitance , and general impedance behavior are discussed.
Ceramic powders containing dispersed inert particulates often exhibit dramatically lower densification rates than the pure powder. This decrease results from the shrinkage incompatibilities of the matrix and the inclusion during densification. The analyses of this phenomenon all predict that the shrinkage rate is only…
The presented data are the result of a reappraisal of the biocompatibility properties of titanium alloys. An in vitro study has been conducted using Hanks' solution with four different additional compounds (EDTA, l-leucine, Na-citrate, and 8-hydroxyquinoline). A measurable dissolution rate was observed for Ti and Al i…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
To examine the conformation of polyanilines with different degrees of oxidation two three-ring oligomers, N-N′-diphenyl-1,4-phenylenediamine (the ‘‘amine trimer’’) and N-N′-diphenyl-1,4-benzoquinodiimine (the ‘‘imine trimer’’) have been studied. The amine and imine trimers are model molecules for leucoemeraldine and p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, NMR characterization, and electrical properties of siloxane-based polymer electrolytesRalph Spindler and D. F. ShriverCite this: Macromolecules 1988, 21, 3, 648–654Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissu…
Films of polyimide (>8 nm) were formed on a polycrystalline silver surface following heating of a vapor-deposited layer of 4,4,-oxydianiline (ODA) and 1,2,4,5-benzenetetracarboxylic anhydride (PMDA). The imidization reaction leading to polymer formation was followed in situ with X-ray photoelectron spectroscopy. Th…
The effects of high temperatures on polymer‐derived Nicalon and chemically vapor‐deposited (CVD) SiC fibers have been investigated by mass‐spectrometric vapor pressure studies and by SEM observations of exposed fibers. Vaporization is kinetically limited for both materials; the predominant species vaporizing from Nica…
Clean polyimide films spin-coated onto gold substrate have been fully characterized by high resolution electron energy loss spectroscopy (HREELS): 19 electron-induced vibrational bands could be resolved and assigned by comparison with IR spectroscopy. The attribution of these peaks constitutes a firm and necessary bas…
Abstract not Available.
Quarter-micrometer gate-length high-electron-mobility transistors (HEMTs) for cryogenic low-noise application with very low light sensitivity have been developed. At room temperature, these exhibit a noise figure of 0.4 dB with associated gain of 15 dB at 8 GHz. At a temperature of 12.5 K the minimum noise temperature…