Materials Literature
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Al–Ni–Co stable decagonal quasicrystals had been believed to belong to P105/mmc and to have decagonal symmetry of the basic atom-cluster column when projected along the decagonal axis. The space group and the projection symmetry of the cluster columns of Al70Ni30-xCox (x = 15 or 20) quasicrystals were re-examined by c…
The effect of elevated deformation temperatures on microstructural parameters in fatigued nickel single crystals has been studied by transmission electron microscopy. The height and length of edge dipoles and the mean dislocation density in the matrix bundles have been measured as functions of temperature using weak-b…
Poly[(oligoethylene oxide) ethoxysilane)] (I) and poly[(oligoethylene oxide) ethoxysilane)]/(EuCl3)0.67 (II) were synthesized by reacting tetraethoxysilane with oligo(ethylene glycol) of molecular weight 400 and oligo(ethylene glycol)400/(EuCl3)0.317, respectively. The products so obtained are very transparent and rub…
Abstract Unlike previous attempts, the entire cycle of melting‐ and crystallization‐induced reordering is realized in binary polymer blends in the following order: two homopolymers → block copolymer → random copolymer → block copolymer. Blends of poly(ethylene terephthalate) Systematic IUPAC name: poly(oxyethyleneoxyt…
A pyrolysis gas chromatography (Py-GC) method has been developed to study the composition and microstructure of styrene/methyl methacrylate (STY/MMA) copolymers. The composition was quantified by Py-GC using monomer peak intensity. Because of the poor stability of methyl methacrylate oligomers, neither MMA dimer nor M…
The sol - gel process provides a method to blend, down to the molecular scale, organic and inorganic components which can be mixed in virtually any ratio to obtain the desired properties. These hybrid nanocomposites are extremely versatile in their composition, processing and optical and mechanical properties. Hybrid…
Abstract A mathematical model for the polymerization of ethylene using silica‐supported chromium catalysts is presented. The fundamentals for the physical and chemical representation of the phenomenon are detailed. The emerging mathematical problem is attached and solved using a multiple moving‐boundary numerical sche…
Abstract The formation of ordered patterns of nanosize polystyrene aggregates was observed by atomic force scopy. The samples were prepared by simply rinsing a mica surface with a dilute polymer solution in benzene.
The products of vaporization of boron/carbon mixtures around 3000 K were trapped in argon matrices at 10 K and their Fourier transform infrared spectra were measured. Analysis of the spectra combined with the predictions of density functional theory (DFT) calculations have resulted in the assignment of a previously ob…
Abstract Pd/Ni bimetallic clusters have been successfully prepared for the first time by a polyol reduction method, in which a mixed solution of Pd and Ni salts were reduced at high temperature by ethylene glycol. The bimetallic clusters are proved by TEM, XRD and preliminary EXAFS analysis to have an alloy structure.…
Type XI collagen is mainly found as a minor constituent in type II-containing fibrils and presents a alpha1(XI)alpha2(XI)alpha3(XI) stoichiometry. This molecule was shown to be partially processed in its intact tissue form. Moreover, alternative splicing has been demonstrated in the variable region of the N-terminal d…
Electromigration results from the movement of metal ions as current flows through power wires in integrated circuits, causing voids and hillocks in the wires. The voids increase resistance or even cause opens in the wires, while hillocks can cause shorts to adjacent wires. This paper describes how electromigration is…
The ferroelectric domain structures of tetragonal lead zirconate titanate (PZT) ceramics were evaluated by investigating the poling field ( E ) dependence of the planar coupling factor ( k p ) and the relative intensity of X-ray diffraction (002) peak, I 002 . Fifteen typical domain configurations were proposed. Furth…
A purely organic mixed‐valence high‐spin species in which the existence of an electron transfer process has been clearly established by NIR spectroscopy is reported. Since magnetic coupling and electron transfer are by no means independent of each other the opportunity to study the first organic material to exhibit bo…
Abstract Inherent flaw sizes were determined from fatigue lifetimes, and from the crack length dependence of the strain energy to break, for four cis -1,4-polyisoprenes compounded to have the same crosslink density and low strain hysteresis. Both techniques indicated that the flaws intrinsic to guayule rubber (GR), an…
Carbon nanotubes prepared by de arc discharge of graphite electrodes in He and CH4 gas took markedly different morphology. Thick nanotubes embellished with many carbon nanoparticles were obtained by evaporation under high CH4 gas pressure and high arc current. Thin and long carbon nanotubes were obtained under a CH4 g…
Abstract Coal combustion by‐product (CCBP; a wallboard‐quality gypsum), limestone, and cellulose had been found to influence the dissolution of North Carolina phosphate rock (NCPR) in an acid Lily loam soil (fine‐loamy, siliceous, mesic Typic Hapludult). Laboratory and incubation experiments were carried out in this s…
Small Al 2 O 3 additions (∼ 4 vol%) made to Y‐TZP using an infiltration technique increased the fracture toughness and strength by ∼15% and the amount of transgranular fracture. Ionic conductivity measurements showed decreased grain‐boundary conductivity, confirming a change in the grain‐boundary composition. The pred…
Abstract Poly(β-malic acid) was prepared by lipase-catalyzed ring-opening polymerization of benzyl β-malolactonate with subsequent debenzylation. Benzyl β-malolactonate was readily polymerized by porcine pancreatic lipase or Novozyme 435 lipase at 60 °C to yield poly(benzyl β-malate) having a molecular weight of great…
The photoionization cross sections for ${\mathrm{Ar}}^{+}$ through ${\mathrm{Ar}}^{4+}$, produced by the Auger decay of a 2p hole in argon, have been measured between 242 eV and 253 eV by the use of synchrotron radiation. The high resolution of the monochromator has allowed a detailed study of the postcollision intera…