Materials Literature
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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…
A spectroscopic investigation of Er 3+ /Yb 3+ co-doped 50SiO 2 –20Al 2 O 3 –30CaF 2 glasses and transparent glass ceramics containing CaF 2 nanocrystals is presented. The formation of CaF 2 nanocrystals in the glass ceramic was confirmed by x-ray diffraction (XRD) and transmission electron microscopy (TEM). The Judd–O…
Abstract Nanocomposites of a new type have been prepared containing a constant amount, 4.8 wt%, of montmorillonite (MMT) in a polypropylene (PP) matrix and different amounts of conducting polypyrrole (PPy) varying from 4.8 to 16.7 wt%. For comparison, polypropylene/polypyrrole (PP/PPy) composites and MMT/PPy nanocompo…
Trioctahedral mica samples, collected at Cava St. Antonio (Mt. Vulture, Italy) were studied by combining electron-microprobe and C-H-N elemental analyses, single-crystal X-ray diffraction refinement, Mossbauer and Fourier transform infrared spectroscopies. Electron-microprobe analyses show the crystals to be quite hom…
Outer surface protein A (OspA) from Borrelia burgdorferi has an unusual dumbbell-shaped structure in which two globular domains are connected with a "single-layer" beta-sheet (SLB). The protein is highly soluble, and it has been recalcitrant to crystallization. Only OspA complexes with Fab fragments have been successf…
Measurements of the solubility and metastable zone for the oxalic acid−water system were obtained. The solubility was measured within the temperature range from 284.19 to 352.02 K. The mole fraction solubility was correlated satisfactorily with the temperature by the equation: x eq = 4 × 10 -7 e 0.0368 T . The values…
This communication describes a procedure for fabrication of hierarchical luminescence patterns based on the template-assisted assembly of CdSe nanocrystals on a self-assembled structure with green-emitting microstripes, as well as the photoinduced fluorescence enhancement of CdSe nanocrystals and photobleaching of dye…
Abstract Summary: Hybrid polyester resins containing polyhedral oligomeric silsesquioxanes (POSS), and their polyurethanes were prepared using reactive POSS as a substitution for partial diol monomer. They were investigated by FT‐IR, rheometry, dynamic mechanical analysis, wide‐angle X‐ray diffraction, contact‐angle m…
Abstract Summary: By using DSC, 13 C CP/MAS NMR and SEM, we studied the physical properties and chemical structure of silk fibers grafted with methacrylamide (MAA). At a given MAA concentration, the inverse of fiber weight gain linearly increased with increasing square root of the initiator concentration, and at a giv…
Abstract Summary: This paper presents the results of an experimental investigation concerning the use of an ethylene butyl acrylate and glycidyl methacrylate (EBAGMA) terpolymer as an interfacial agent for isotactic poly(propylene)/wood flour (iPP/WF) composites at various filler ratios (10, 20 and 30 wt.‐%). The effe…
The rate of energy transfer from Si nanocrystals to Er ions was modified by placing a Au layer nearby. The distance between the active layer and the Au layer as well as the wavelength were changed systematically to quantitatively discuss how the energy transfer rate is modified by the photonic mode density. It was fou…
Abstract Assessing the degree of organoclay delamination and layer alignment is crucial to deliver consistent properties of nanocomposite materials. A simple infrared technique is discussed that permits quantitative determination of these organoclay dispersion parameters in a nanocomposite. This technique complements…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEffective Acid-Catalyzed Synthesis of 100% Hyperbranched PolyacenaphthenonesYu Fu, Annelies Vandendriessche, Wim Dehaen, and Mario SmetView Author Information Department of Chemistry, University of Leuven, Celestijnenlaan, 200F, B-3…
Abstract In the present work, the effectiveness of using a styrene/ethylene–butylene/styrene rubber grafted with maleic anhydride (MA) as toughening material in ternary blends with two polyamide‐6 nanocomposites or PP with different molecular weight as matrix phases was evaluated in terms of SEM and TEM morphology, WA…