Materials Literature
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Extended angle-resolved noble metal nanostructures such as nanooverlaps, nanocontacts, nanogaps, and nanochains show diverse optical characteristics. Polarized microextinction spectroscopy demonstrates dichroic contrast varying between 20 and 200 nm upon comparing the optical spectra of the transverse and longitudinal…
Quasi-ordered, highly dispersed, gold nanoclusters of tightly controlled particle size were synthesized by dip-coating substrates with gold precursors encapsulated by block-copolymer micelles. By this method, gold particles (4.8 +/- 1.3 nm) were deposited on ITO-coated glass and shown to be catalytically active for el…
Abstract A numerical and experimental study of the plasma variables in the synthesis of polyaniline in radio‐frequency (RF) glow discharges is presented. The plasma variables were measured on the basis of data collected by electrostatic Langmuir probes placed along the reactor. The results showed the distribution of t…
Abstract A copper(II) and two nickel(II) dinuclear oxalato‐bridged compounds of formulae [{Cu(bpdto)} 2 ( μ ‐ox)](ClO 4 ) 2 ( 1 ), [{Ni(bpdto)] 2 ( μ ‐ox)](ClO 4 ) 2 ( 2 ), and [{Ni(bpdto)} 2 ( μ ‐ox)](NO 3 ) 2 ·2H 2 O ( 3 ), where bpdto = 1, 8‐bis(2‐pyridyl)‐3, 6‐dithiaoctane and ox = oxalate = C 2 O 4 2— anion, have…
Using numerical simulations we show that a variety of novel colloidal crystalline states and multi-step melting phenomena occur on square and triangular two-dimensional periodic substrates. At half-integer fillings different kinds of frustration effects can be realized. A two-step melting transition can occur in which…
We have carried out extensive molecular dynamics simulations of a supercooled polydisperse Lennard-Jones liquid with large variations in temperature at a fixed pressure. The particles in the system are considered to be polydisperse in both size and mass. The temperature dependence of dynamical properties such as the v…
Abstract Poly(2‐iodoaniline) (PIANI) and poly(aniline‐ co ‐2‐iodoaniline) [P(An‐ co ‐2‐IAn)] were synthesized by electrochemical methods in acetonitrile solution containing tetrabutylammonium perchlorate (TBAP) and perchloric acid (HClO 4 ). The voltametry of the copolymer shows characteristics similar to those of con…
The melting behavior as well as the crystallization kinetics of a series of polystyrene- b -polybutadiene- b -poly(ε-caprolactone) ABC triblock copolymers was investigated by differential scanning calorimetry (DSC). The studies were performed as a function of annealing time at high temperature (150 °C), maintaining in…
Abstract Durch Reaktion von Eisen(III)‐chlorid in Diethylether mit Natrium‐ tert‐ butylat konnte das homoleptische dimere tert ‐Butoxid [Fe 2 (O t Bu) 6 ] ( 1 ) hergestellt werden. Die Chloro‐Derivate [Fe 2 Cl 2 (O t Bu) 4 ] ( 2 ) und [Fe 2 Cl 4 (O t Bu) 2 ] ( 3 ) wurden durch Liganden‐Austausch zwischen 1 und Eisen(I…
In this paper the electromagnetic properties of bianisotropic electromagnetic crystals are studied. The crystals are assumed to be rectangular lattices of perfectly conducting helicoidal spirals. The analytical theory of dispersion and plane-wave reflection refers to the case when the spiral step and the radius are sm…
Nanocomposites of oligo-poly(caprolactone) (o-PCL) with layered silicates having a variety of organic modifiers have been prepared by simple mechanical mixing. The effect of organic modifier type on the miscibility with o-PCL has been studied. The results indicate that miscibility increases with increasing alkyl chain…
Self-assembled polyelectrolyte multilayer films comprised of poly(allylamine) derivatized with an Os(bpy) 2 ClPyCH− complex (PAH−Os), and poly(vinylsulfonate), PVS, or poly(styrensulfonate), PSS, have been studied by Fourier transform infrared reflection−absorption spectroscopy. The infrared absorbances of the charact…
We have investigated the ordering processes from the disordered-sphere phase (designated hereafter disordered sphere), where spherical microdomains exist but they have only a short-range liquidlike order, to the phase of hexagonally packed cylindrical microdomains (designated hereafter hex-cylinder), induced by the te…
A highly fluorinated hyperbranched aromatic polymer was prepared by a mild one-step polyesterification of an AB 2 type monomer at room temperature using dicyclohexylcarbodiimide and 4-(dimethylamino)pyridium 4-toluenesulfonate as the condensation agents. It was then postfunctionalized with thermally cross-linkable aro…
Abstract Hydrothermally synthesized CsHSi 2 O 5 was studied by single‐crystal X‐ray diffraction. The compound is orthorhombic (space group Pnma ). Unit cell parameters are a = 4.9758(3), b = 8.8089(6), c = 12.9295(9) Å with four formula units per cell. The structure was solved by direct methods and refined to a residu…
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…