Materials Literature
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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…
Optical vortices are shown to be generated in the near-field through interference between a propagating wave and the amplified evanescent field in a slab of lossy left-handed material. While small loss adversely impacts the sub-wavelength performance in the lens application, the vortex character shown relies on some d…
This paper presents a new approach for predicting solvent effects on esterification reactions of industrial importance in the field of biocatalysis. The COSMO-RS method has been used to calculate the activity coefficients of the chemical species involved in various reactions, carried out in different solvents. For com…
Abstract In this article, nanocomposites based on polypropylene containing montmorillonite, modified with two different intercalants (primary and quaternary amine), at three different coverage levels have been investigated. The specimens were prepared in a mini‐extruder machine with a counter‐rotating configuration. T…
Thin film morphologies of four symmetric semicrystalline oxyethylene/oxybutylene diblock copolymers (E 76 B 38, E 114 B 56, E 155 B 76, and E 224 B 113 ) were investigated by tapping mode atomic force microscopy (AFM). The effects of chain length, annealing, and surface property were examined. It is found that the lam…
Abstract Summary: In order to reveal mechanisms for the electrospinning of proteins, this study focuses on the polymer chain conformation, which is considered to be a critical factor for successful electrospinning. Poly( γ ‐benzyl‐ L ‐glutamate) (PBLG) is employed and the relationships between the chain conformations…
Abstract A two‐step route to polymer/layered silicate nanocomposites characterized by a large extent of nanoplatelet delamination is presented. It consists first in the preparation of poly(ε‐caprolactone) (PCL)‐grafted clay masterbatches (containing ∼30 wt% clay) by in situ intercalative polymerization of ε‐caprolacto…