Materials Literature
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Abstract Summary: Due to its unique combination of properties, PTT is a promising material for textile fibre and engineering thermoplastic applications, both as neat polymer and in formulated products. To bring down the cost yet keeping some of its advantageous properties it seems interesting to apply PTT in blends an…
Abstract The Keggin dodecatungstoarsenato anion of HNa 2 [AsW 12 O 40 ] is inherently unstable in aqueous hydrogen peroxide and is mainly degraded to [AsO 4 {W 2 O 2 (μ‐O 2 ) 2 (O 2 ) 2 } 2 ] 3– , [HAsO 4 {W 2 O 2 (μ‐O 2 ) 2 (O 2 ) 2 }] 2– and [{WO(O 2 ) 2 (H 2 O)} 2 (μ‐O)] 2– . These anions were isolated as salts and…
Abstract The ordered honeycomb structures of poly( L ‐lactic‐ co ‐glycolic acid) and poly( D , L ‐lactic‐ co ‐glycolic acid) fabricated in a humid atmosphere were reported in this paper. It was found that surfactants were important in the formation of honeycomb films of hydrophobic polymer. The affecting factors, such…
The reaction of Fe2+ with CN-, which was first performed in 1704, has been used to synthesize a new series of basic [FeII,III(CN)4L2]n- complexes, where L is a monodentate ligand. trans-Na2[FeII(CN)4(DMSO)2] and cis-[NEt4]2[FeII(CN)4(pyridine)2] are synthesized by the direct reaction of FeCl2 with 4 equiv of CN- in DM…
The influence of uniaxial stress on local vibrational modes of hydrogen in ZnO has been studied by IR absorption spectroscopy. The defects considered are two centers tentatively assigned to isolated hydrogen trapped at the bond-centered and antibonding sites, a defect related to hydrogen trapped by a substitutional Li…
Silicon atoms are found to form an ordered overlayer on the fivefold surface of the icosahedral $\mathrm{Al}\text{\ensuremath{-}}\mathrm{Pd}\text{\ensuremath{-}}\mathrm{Mn}$ quasicrystal. Using scanning tunneling microscopy, the adsorption site is identified as the center of truncated clusters which are building block…
Abstract The object of this work is to investigate the microwave absorbing properties of nanocomposite bulk samples. As filler we used magnetite with different particle size in a silicone rubber matrix and investigated the influence of the filler concentration and particle size in the polymer matrix on the microwave n…
Abstract The miscibility and crystallization behavior of poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (P(HB‐ co ‐HV))/poly(vinyl acetate) (PVAc) blends have been investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). It was found that P(HB‐ co ‐HV)/PVAc blends were miscible i…
Abstract The synthesis of original fluorinated (co)telomers containing vinylidene fluoride (VDF) or VDF and hexafluoropropene (HFP) was achieved by radical telomerizations and (co)telomerizations of VDF (or VDF and HFP) in the presence of 1, 6‐diiodoperfluorohexane via a semisuspension process. tert ‐Butyl peroxypival…
The dc magnetization $(M)$ and electrical resistivity $(\ensuremath{\rho})$ as functions of magnetic field and temperature are reported for a series of lightly electron doped ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ $(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.10)$ specimens…
Abstract The current investigation was aimed at assessing the effect of carboxylation of NBR phase in dynamically vulcanized NBR/low‐melting polyamide thermoplastic elastomeric compositions. Improved strength and set properties were achieved because of better compatibilization with carboxylated NBRs. The dispersion of…
Abstract A series of crystals of phenyl‐capped tetraaniline in the leucoemeraldine oxidation state were obtained at different isothermal temperatures and were observed directly under transmission electron microscope. The crystals obtained at higher temperatures exhibit more perfect structures than those obtained at lo…
Abstract The effects of interfacial adhesion strength on the mechanical behavior of composites of polyamide 66 and precipitated calcium carbonate (CaCO 3 ) particles have been investigated. The 50 nm average diameter particles have been surface‐treated using two kinds of coupling agent having various affinities with r…
The relative energies of beta Keggin heteropolytungstates, X(n+) W12O40(8-n)-, decrease as X(n+) is varied within period 3, from P5+ to Si4+ to Al3+. With heating of alpha-H5Ga3+ W12O40 at 200 degrees C in water, an equilibrated mixture of alpha (T(d); one 183W NMR signal) and beta (C(3v); three signals; 1:2:1 ratio)…
BACKGROUND: The N-acetylation of L-glutamate is regarded as a universal metabolic strategy to commit glutamate towards arginine biosynthesis. Until recently, this reaction was thought to be catalyzed by either of two enzymes: (i) the classical N-acetylglutamate synthase (NAGS, gene argA) first characterized in Escheri…
The infrared emission spectra of CO adsorbed on alumina-supported 1, 3, and 5 wt % Rh, Ir, and Pt metal-containing catalysts were studied at 423 and 473 K. While CO is adsorbed in dicarbonyl (dimer), linearly (on-top) bonded and bridged carbonyl forms on rhodium and platinum, the dimer form is dominant on iridium. The…
The optical and dielectric properties of ZnS nanoparticles are studied by use of terahertz time-domain spectroscopy (THz-TDS) over the frequency range from 0.3 to 3.0 THz. The effective medium approach combined with the pseudo-harmonic model of the dielectric response, where nanoparticles are embedded in the host medi…
We study the Holstein-double exchange model in three dimensions in the presence of substitutional disorder. Using a new Monte Carlo technique we establish the phase diagram of the clean model and then focus on the effect of varying electron-phonon coupling and disorder at fixed electron density. We demonstrate how ext…
Shape memory alloys (SMAs) are characterized by unique superelastic behaviour which enables the material to recover its original shape after experiencing large deformations. This phenomenon provides ideal recentring capabilities which can be used in the passive control of structures subjected to earthquakes. However i…
Abstract At low temperatures, helium atoms diffuse primarily by an interstitial mechanism due to the lower activation energy. Using a modified analytic embedded‐atom model (MAEAM) and the molecular dynamics method, a study of the interstitial diffusion for helium atoms in perfect nickel and palladium was performed. Co…