Materials Literature
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The synthesis and characterization of ruthenium complexes [Ru(CO) 2 (amak) 2 ] and [Ru(COD)(amak) 2 ] (where COD = 1,4-cyclooctadiene) are reported, where (amak)H is an abbreviation for a series of fluorinated amino alcohol ligands with formula HOC(CF 3 ) 2 CH 2 NHR, where R = H, Me, Et, and (CH 2 ) 2 OMe. The carbony…
Abstract Creep studies were carried out on a range of homopolymers and copolymers of polyethylene with well‐defined molecular weight and branch content. The creep data were analyzed in terms of two thermally activated processes acting in parallel and the effects of molecular weight and branch content are discussed. It…
We report our first-principles studies on the linear and non-linear optical properties of ferroelectric polyvinylidene fluoride crystal. Calculated values of the refractive indices agree well with experiments. As regards the second-harmonic-generation coefficients, theoretical values are larger than experimental ones.…
The density functional study of the activation and adsorption of several H 2 molecules on Pd n clusters is extended to n = 5. Detailed mechanisms of H−H activation by the trigonal bipyramidal (tbp) Pd 5 cluster are described. They encompass various reaction pathways initiated by binding the first and second H 2 to the…
Abstract The electrochemical properties and the stability of the Cr III complexes [Cr(pic) 3 ]·H 2 O and [Cr(pic) 2 (OH)] 2 ·5H 2 O (Hpic = pyridine‐2‐carboxylic acid = picolinic acid) were investigated in DMF solutions by cyclic voltammetry, and complemented by electronic spectroscopy. The electrochemical results ind…
The effect of chemical etching in a HF/HNO(3) acid solution and aging in boiling water on the corrosion resistance of Nitinol wires with black oxide has been evaluated with the use of potentiodynamic, modified potentiostatic ASTM F746, and scratch tests. Scanning-electron microscopy, elemental XPS, and Auger analysis…
Abstract Thermal properties, such as thermal conductivity, thermal diffusivity, and specific heat, of treated and untreated oil palm fiber–reinforced PF composites were measured simultaneously at room temperature and normal pressure using the transient plane source (TPS) technique. An increase in thermal conductivity…
A new crystal of 2-aminopyridine phosphate (NC 4 H 4 NH 2 )·H 3 PO 4 has been grown and its x-ray structure and physical properties were studied. At room temperature the crystals are monoclinic, space group C 2/ c . The flat 2-aminopyridine cations are hydrogen bonded to the anionic [PO 4 ] groups. The interesting fea…
Abstract The main goal of this study was to analyze the effect of process additives, that is, maleated polypropylene (MAPP), and a nucleating agent on the viscoelastic properties of different types of extruded polypropylene (PP) wood plastic composites manufactured from either a PP homopolymer, a high crystallinity PP…
Abstract Das Terbium‐ meta‐ Oxoborat Tb(BO 2 ) 3 (≡ TbB 3 O 6 ) entsteht einkristallin bei der Reaktion von Terbium, Tb 4 O 7 und TbCl 3 mit einem Überschuß von B 2 O 3 in gasdicht verschlossenen Platinampullen nach drei Wochen bei 950 °C. Die Verbindung ist luft‐ und wasserstabil und fällt in langen, dünnen, farblose…
Mesoporous silicas with controlled morphologies have been synthesized using decaoxyethylene cetyl ether [C 16 (EO) 10 ] as a surfactant (10 wt % in aqueous solution). A large series of characterization results (SEM, TEM, XRD, and nitrogen adsorption−desorption analysis) have demonstrated how the surfactant/silica mola…
Band-structure calculations predict a gap of 1.5 eV in the minority-spin density of states of the half-metallic ferromagnet ${\mathrm{CrO}}_{2}.$ The magnitude of ${T}_{C},$ the magnons, and the activation gap in the resistivity cannot be explained with this band picture. We propose a double-exchange mechanism for two…
We propose a new procedure to synthesize high internal phase polymeric emulsions (polyHIPE) that is based on the self-assembly of colloidal systems. Colloidal suspensions were used as precursors of the final polyHIPE. These were obtained by dispersing 500 nm diameter, lightly cross-linked polystyrene (PS) emulsion par…
Poly(propyleneimine) (PPI) dendrimers and their end-functionalized derivatives are studied with steady and dynamic rheology to determine the influence of specific end groups. Fourth- and fifth-generation PPI dendrimers exhibit constant shear viscosities over a wide range of shear rates. Function-alizing the molecular…
Introduction of an asymmetric center to C-2 of one of the benzothiophene rings of bisbenzothienylperfluorocyclopentene results in a highly diastereoselective photochromic system. The stereogenic center bears a hydrogen atom, a methyl group, and a methoxymethoxy group. The steric as well as the electronic repulsions ga…
As the field of structural genomics continues to grow and new technologies are developed, novel strategies are needed to efficiently crystallize large numbers of protein targets, thus increasing output, not just throughput [Chayen & Saridakis (2002). Acta Cryst. D58, 921-927]. One strategy, developed for the high-thro…
The square planar, light-green, diamagnetic complex [N(n-Bu)(4)][Au(III)(L(t)()(-)(Bu))(2)] (1) reacts with iodine in acetone affording the neutral paramagnetic species [Au(L(t)()(-)(Bu))(2)] (1a) (S = (1)/(2)) where H(2)[L(t)()(-)(Bu)] represents the ligand 3,5-di-tert-butyl-1,2-benzenedithiol. The corresponding comp…
The nucleation and growth process of anatase TiO 2 on several kinds of self-assembled monolayers (SAMs) in an aqueous solution has been evaluated in detail. Homogeneously nucleated TiO 2 particles and amino groups of SAM showed negative or positive ζ potential in the solution, respectively. The adhesion of TiO 2 parti…
We present high-precision measurements of pure element stable isotope pairs that demonstrate mass has no influence on the backscattering of electrons at typical electron microprobe energies. The traditional prediction of average backscatter intensities in compounds was pragmatically based on elemental mass fractions.…
Rheological studies of suspensions of solid particles in a liquid polymer subjected to high-pressure carbon dioxide are reported. A rotational viscometer has been adapted to measure the viscosity of liquid polymers and silica suspensions under these conditions. The viscosity reduction of poly(propylene glycol) (PPG) w…