Materials Literature
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The aggregative behaviors of hydroxypropylcellulose (HPC) molecules in aqueous solution and on substrates have been observed by employing laser light scattering (LLS) and, after deposition on a mica surface, atomic force microscopy (AFM). LLS studies showed that the HPC molecules formed large aggregates through self-a…
The title compound, poly[samarium(III)-tri-μ-formato], [Sm(HCO2)3]n, is isostructural with numerous lanthanide formates and comprises a three-dimensional framework assembled from SmO9 polyhedra and HCO2− anions. The Sm atom lies on a site of 3m symmetry and is coordinated by nine O atoms in a typical coordination geom…
Samples of kirkiite from the high temperature fumaroles of La<sup> </sup>Fossa crater of Vulcano (Aeolian islands, Italy) were chemically<sup> </sup>and structurally investigated in this work. Associated minerals<sup> </sup>are vurroite, bismuthinite, galenobismutite, cannizzarite, lillianite,<sup> </sup>heyrovsk<img…
Molekulare Leiter: Ein neuer, modifizierbarer Elektronenacceptor mit 5,6,11,12-Tetraazanaphthacen(TANC)-Gerüst wurde in Kupfer(I)-TANC-Koordinationspolymere eingebaut (siehe Bild). Die Leitung in hoch leitfähigen Kristallen dieser Polymere kann als 1D-Hopping-Mechanismus beschrieben werden und beruht auf fehlgeordnete…
In order to correct secondary longitudinal chromatic aberration in conventional refracting optical systems, it is necessary to use at least one optical material having anomalous partial dispersion. A novel lens system with correction of the secondary spectrum by using only normal glasses is presented. The lens system…
We report a novel dielectric anomaly around the Jahn–Teller orbital order–disorder transition temperature T JT in LaMnO 3+δ . The transition has been characterized by resistivity (ρ) versus temperature ( T ), calorimetry, and temperature dependent x-ray diffraction studies. Measurements of complex dielectric permittiv…
Abstract Clay‐polypropylene (PP) nanocomposites (NCs) were prepared by melt processing. Two types of PP with different levels of crystallinity were used. Mixtures of the two PPs were made at different ratios that generate a varying degree of crystallinity for the final NC samples. The level of micro‐ and nanodispersio…
A manganocolumbite with nominal composition MnNb 2 O 6 has been prepared under air in order to characterize its electrical behavior. Although powder X-ray diffraction indicates the presence of a single phase, electrical and microscopic characterization reveals two different bulk responses. The origin of these two bulk…
Gly-Arg-Gly-Asp-Ser (GRGDS) was modified by conjugation to lauric acid (LA) to facilitate incorporation into the matrix of a poly(carbonate-urea)urethane (PCU) used in vascular bypass grafts. GRGDS and LA-GRGDS were synthesized using solid phase Fmoc chemistry and characterized by high performance liquid chromatograph…
Farbwechsel: Goldnanopartikel (GNPs), die mit einem Kronenether und Liponsäure funktionalisiert sind, eignen sich für den raschen Nachweis von Analyten mit dem bloßen Auge. Beim Brechen der Wasserstoffbrücken zwischen aggregierten GNPs unter Bildung einer Dispersion tritt eine Farbänderung ein. So lässt sich beispiels…
Direct neutral metal emission from MgO nanostructures is induced using laser light tuned to excite specific surface sites at energies well below the excitation threshold of the bulk material. We find that near UV excitation of MgO nanocrystalline films and nanocube samples desorbs neutral Mg atoms with hyperthermal ki…
The neutralization reaction between the meso -tetrakis(4-carboxyphenyl)porphyrin (TPPC) and O -(2-aminopropyl)- O ‘-(2-methoxyethyl)poly(propylene glycol) (Jeffamine M-600) in 1:4 stoichiometric ratio affords a stable supramolecular adduct (TPPC@Jeffamine). This species has been characterized in aqueous and chloroform…
A combined experimental (optical and electro-optical absorption measurements) and computational (ab initio RHF and DFT) approach has been used to investigate the molecular low- and high-T(g) photorefractive (PR) performances of neutral and zwitterionic heteroaromatic dipolar chromophores in terms of structural and sol…
There have been many recent experimental studies of rare earth (RE) phosphate glasses, (RE 2 O 3 ) x (P 2 O 5 ) 1− x , but only two previous reverse Monte Carlo (RMC) modelling studies. The current study reports the first molecular dynamics model of an RE phosphate glass, for Tb metaphosphate glass, with x = 0.25. The…
The carbon nanotube (CNT) is a promising reinforcement material for manufacturing metal-or ceramic-based composites. However, CNTs are prone to interact with the matrix in a reactive atmosphere that often alters the structure and properties of CNTs and depresses their reinforcing effect. To overcome this problem, a pr…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTReconciling STEM and X-ray Scattering Data from a Poly(styrene-ran-methacrylic acid) Ionomer: Ionic Aggregate SizeNicholas M. Benetatos, Paul A. Heiney, and Karen I. WineyView Author Information Department of Materials Science and E…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Solid State Properties of a Poly(methyl methacrylate)-block-poly(2-(diethylamino)ethyl methacrylate)-block-poly(methyl methacrylate) Triblock CopolymerPaul D. Topham, Jonathan R. Howse, Oleksandr O. Mykhaylyk, Steven P. Armes, Richard A. L. Jones, and Anthony J. R…
We carry out systematic molecular mechanics (MM) analyses to study the effect of the displacement increment on the critical buckling strain of single-walled carbon nanotubes (SWCNTs) under axial compression. The SWCNT geometric parameters, such as the tube length, diameter, and chirality, are varied in the numerical s…
Abstract We have investigated the temperature dependence of temporal behaviors of the A X and A T luminescence bands in NH 4 Cl:Tl + single crystals under an ArF excimer laser excitation. The time‐resolved A X luminescence spectra reveal the existence of two luminescence bands which are attributed to the radiative tra…
Der optimale Keim: Mehrere Metallnanokristalle wurden als Kristallisationskeime für Silicium- und Germanium-Nanodrähte untersucht. Dazu wurden Silan- oder Germanreagentien in überkritischen organischen Solventien zersetzt. Co- und Ni-Nanokristalle erleichtern die Keimbildung qualitativ hochwertiger Nanodrähte und kata…