Materials Literature
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Binary mixtures of lamellar colloids represented by hard platelets are studied within a generalization of the Zwanzig model for rods, whereby the square cuboids can take only three orientations along the x, y or z axes. The free energy is calculated within Rosenfeld’s “fundamental measure theory” adapted to the presen…
A study of the thermally induced and photoinduced changes in the mechanical properties of thin azobenzene polymer layers utilizing electromechanical spectroscopy is presented. Upon illumination at room temperature, weak photoinduced plasticization is observed. This is well below the degree of softening induced by heat…
Abstract Eight solvates of magnesium bis(tetrahydroborate) have been prepared and characterised by NMR and IR spectroscopy, and five of them also by X‐ray crystallography. Compounds Mg(BH 4 ) 2 ·3NH 2 t Bu and Mg(BH 4 ) 2 ·3pip each have a distorted trigonal‐bipyramidal structure (with the BH 4 group viewed as a simpl…
Abstract Plasma glow‐discharge application is known as a technique to coat or modify the surfaces of various materials. In this study, the influence of oxygen rf‐plasma treatment on surface and bulk properties of a biological polyester, poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate), were studied by determining water co…
Lead zirconate titanate (PZT) thin films were deposited on stainless steel (SS) substrates by a sol-gel spin-on technique, and crystallized by a low-temperature annealing process. A lead titanate thin coating was deposited between the PZT film and SS substrate in order to decrease the annealing temperature. X-ray diff…
Nanowires are grown from a cold-field-emission tip in the presence of a precursor, typically an organometallic or organic compound. Electron emission from the newly grown nanowire tip continues the growth and can give rise to nanowires that are tens of microns long. Single nanowires are obtained by limiting the field-…
Adsorption of H2, H22, O2, and CO on ZrB2(0001) was investigated by using high-resolution electron energy loss spectroscopy. In hydrogen and oxygen adsorption, a strong loss peak appears in the specular spectra, showing the dissociative adsorption on the threefold hollow site. The vibrational frequency shifts toward h…
Die charakteristische gelbe Farbe des TS-1/H2O2/H2O-Systems wird einer Side-on-Ti-Peroxo-Spezies als der aktiven Zwischenstufe bei Partialoxidationen zugeschrieben. Die Resonanz-Raman-spektroskopische Analyse des Zeoliths und eines Modellsalzes ((NH4+)3(TiO2F5)3−, siehe Bild) in Kombination mit der Analyse eines Ti-fr…
Abstract The trinuclear zinc siloxane [(MeZn) 2 Zn(OSiPh 3 ) 4 ] ( 1 ) and the first novel siloxane‐bridged hexanuclear dimer [{Me(THF)Zn} 2 OZn(OSiR 2 )(R 1 )] 2 (R = Ph, R 1 = OSiR 2 OSiR 2 O) ( 2 ) are accessible by Brønsted acid/base reaction of triorganosilanols with the zinc base ZnMe 2 . Both compounds were cha…
The surface pressure−area (π− A ) isotherms of enantiomeric polylactides and their equimolar blend reveal differences in the appearance of features and compression rate effects. Surface potential data indicate that the poly( l -lactide) monolayer interacts differently than the 50:50 poly( l -lactide)/poly( d -lactide)…
Abstract A one dimensional cobalt( II )−radical complex [Co(tmpyim) 2 (tp)] [tmpyim = 4,4,5,5‐tetramethyl‐2‐(3′‐pyridyl)imidazoline‐1‐oxyl 3‐oxide and tp = terephthalate dianion] has been synthesized and characterized by X‐ray crystallography. The crystal structure consists of infinite chains of Co(tmpyim) 2 units cro…
Polyoxoanions have enormous potential as drug delivery hosts, as catalysts, as agents for sequestering nuclear waste heavy metals, and as luminescent materials for laser and optical devices applications. We report the encapsulation of the polyoxoanion [Eu(H 2 O) 3 (α-1- P 2 W 17 O 61 )] 7- within Mobil crystalline mat…
The adsorption and oxidation reaction of CO on γ-Al 2 O 3 single-crystal thin films with Au nanoparticles were studied as a function of the particle size using reflection−adsorption infrared spectroscopy, temperature-programmed desorption (TPD), and the molecular beam technique in a temperature range of 93 K < T s < 2…
The symmetry adapted cluster (SAC)/SAC-configuration interaction method was applied to calculate the ground and excited states of zinc porphyrin monomers (without and with phenyl groups, ZnP and ZnPPh, respectively) and meso–meso linked (Zn2PMM) and doubly fused (Zn2PDF) zinc porphyrin dimers. Various features of the…
We present a study of the ambient and low-temperature dynamics on a single-crystalline sample of ${\mathrm{NbSe}}_{3}$ using meV-resolution inelastic x-ray scattering. Two phonon branches (LA, ${\mathrm{TA}}_{1})$ propagating along the system's quasi-one-dimensional direction ${b}^{*}$ have been determined. The low-te…
Annealing of sPP after a rapid quench from the melt to a temperature below T g (−3 °C) leads for an annealing temperature T c = 0 °C to a trans-rich mesomorphic phase, for T c = 25 °C to the helical crystalline phase, and for T c = 2 °C to a mixture of both phases. SAXS experiments show that the layer thickness and th…
An efficient synthetic route to fuse [5]helicene moieties around the phthalocyanine core is reported. The helicene moiety was constructed by the Diels-Alder reaction of 3,4,3',4'-tetrahydro-1,1'-dinaphthyl and dibromobenzyne. Subsequent cyanation, oxidation, O-alkylation, and cyclic tetramerization resulted in octaalk…
Abstract Self‐doped poly(aniline‐ co ‐aminonaphthalene sulfonic acid) (PANI‐ANSA) was synthesized by the copolymerization of 5‐aminonaphthalene‐2‐sulfonic acid (ANSA) and aniline. Scanning electron microscopy and transmission electron microscopy showed that the morphology of PANI‐ANSA synthesized at a high molar ratio…
SiO 2 thin films on Mo(112) have been characterized using metastable impact electron and ultraviolet photoelectron spectroscopies (MIES and UPS). The electronic properties of SiO 2 thin films with a thickness of 0.7−0.8 nm are identical to those of bulk SiO 2 . For defective SiO 2 surfaces prepared by three different…
Radiative lifetime, polarization, and the global Stokes shift of colloidal CdSe quantum rods with aspect ratios from 1.9 to 3.8 are measured at room temperature. The radiative lifetime and the global Stokes shift show nonmonotonous dependence on the aspect ratio of the nanorods, and strong linear polarization in emiss…