Materials Literature
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The significant factor that determines the improvement of properties in rubber by the incorporation of nanoclay is its distribution in the rubber matrix. The simple mixing of nonpolar rubber and organically modified nanoclay will not contribute for the good dispersion of nanofiller in the rubbery matrix. Hence a polar…
A series of composite films were prepared by blending chitosan with three polycations, poly(L-lysine), polyethyleneimine, and poly-L-ornithine, in specific blend proportions. The surface properties of the composite films, including surface topography, chemistry, and wettability, were examined by atomic force microscop…
A wind turbine blade generally consists of two shells which are bonded together with a structural adhesive. K.P. Subrahmanian and Fabrice Dubouloz of Huntsman Advanced Materials discuss the requirements for the adhesives used and the development of a product with improved toughness.
Elastomers based on a copolymer of butadiene and acrylonitrile (NBR) have excellent oil resistance but are very sensitive for degradation at very high temperatures. The aim of this applicative contribution was to determine the effect of high abrasion furnace carbon black with primary particle size 46 nm on aging prope…
A method of synthesizing stable and reactive modified mesoporous hybrid materials with intact heteropolyacid (HPA) Keggin units is reported. The materials were synthesized by a one-pot method using a mixture of structure directing agents (CTAB and Pluronic 123). The key to obtaining stable HPA containing materials was…
Abstract Ihr biomimetisches Design, ihre guten Donoreigenschaften und ihre flexiblen Syntheseprotokolle eröffnen der Ligandenklasse der Guanidine viele Perspektiven in der Koordinationschemie — etwa bei der Aktivierung kleiner Moleküle durch Übergangsmetall‐Guanidin‐Komplexe.
GadoTO, a MR contrast agent for the detection of cell death, consists of a nucleic acid-binding fluorophore attached to a gadolinium chelate.
A nanohybrid consisting of water-soluble thioglycolic acid (TGA)-capped CdTe nanocrystals (NCs) and methylene blue (MB) was designed as a label-free luminescent signaling platform for DNA. This sensing system was identified to operate under the photoinduced electron transfer (PET) mechanism in which MB is the electron…
Molecular design and architecture of four novel organic–inorganic network hybrids were implemented via hydrosilylative addition reaction of octahydridosilsesquioxanes (H8-POSS) with dienes. The structural characterization by the FTIR, 13C MAS NMR and 29Si MAS NMR technologies, respectively, indicates that two monomers…
The interface formation between transparent conducting Sn-doped indium oxide (ITO) and dielectric aluminium oxide has been studied by photoelectron spectroscopy using in situ sample preparation by magnetron sputtering. The electronic structure including band alignment, changes in Fermi level position and work function…
We have developed a photoemission-assisted plasma-enhanced chemical vapor deposition (CVD) process, where DC discharge plasma is assisted by photoelectrons emitted from the substrate under ultraviolet (UV) light irradiation. Under Ar gas atmosphere and in vacuum, plasma current was measured as a function of sample bia…
We describe a novel and facile strategy to modify the surface of carbon nanotubes (CNTs) with two chemically different polymer brushes utilizing the ‘grafting from’ technique. A [4 + 2] Diels–Alder cycloaddition reaction was used to functionalize multi-walled carbon nanotubes (MWNTs) with two different precursor initi…
We prepared a homologous series of bent-shaped molecules with a low bent angle of about 60° using a 1,7-naphthalene central core, a long side wing in which one phenyl ring is attached to the classical wing via an ester linkage and alkoxy tail groups with numbers of carbons of 4 to 14. All the compounds form well-defin…
The binding constants of acetate and benzoate to a Pheha-based 15-metallacrown-5 have been determined by a fluorimetric indicator displacement assay demonstrating on a thermodynamic basis the stabilization effect arising from complexation of the less polar carboxylate into the hydrophobic pocket of the metallacrown sc…
Uniform thick mesoporous germanium layers are reproducibly formed on 4 in. p-type Ge wafers by electrochemical etching in highly concentrated HF electrolytes. Pore formation by anodic etching in germanium leads to a constant dissolution of the porous layer. The growth rate of the porous Ge layer is therefore given by…
Efficient and facile reductions of flavones with sodium borohydride (NaBH4) catalyzed by cobalt(II) phthalocyanines afford cis-flavan-4-ols in 89-97% yields.
Cation doping studies of high performance thermoelectric Zn4Sb3 have so far focused on elements with larger electronegativity than Zn. Mg has a lower electronegativity than Zn, and, in the present paper, the effect of Mg doping of Zn4Sb3 on phase transition temperatures and thermal and thermoelectric properties have b…
The use of supercapacitors as energy storage systems is evaluated in this work. Supercapacitors are compared with other technologies such as compressed air, pumped hydro, superconductors and flywheels. This paper is focused on medium scale energy storage systems (applied to 100 kW photovoltaic generation plants). The…
We studied the persistent luminescence in europium-doped calcium thiosilicate upon codoping with the rare-earth elements neodymium, dysprosium, samarium, and thulium. The strongest afterglow was observed for neodymium codoping. The persistence emission spectrum is dominated by a band at , which makes the afterglow col…
The demands for improved fuel economy,performance and emissions continue to pose challenges for engine designers and the materials they choose. This is particularly true for modern diesel engines,where the primary path to achieving improved engine performance and emissions is to increase the Peak Firing Pressure in th…