Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Synthesis and Solubilization of Amide Macrocycles via Rotaxane FormationAndrew G. Johnston, David A. Leigh, Aden Murphy, John P. Smart, and Michael D. DeeganView Author Information Department of Chemistry, University of Manchester Institute of Science and Technolog…
Ceramic‐metal composites have been made to near net‐shape by reactive penetration of dense ceramic preforms by molten Al. In contrast to processes involving physical infiltration of a porous medium, this process works with dense ceramic preforms. Ceramic‐metal composite formation by reactive metal penetration is drive…
Single crystalline n‐type GaP was made porous by anodic etching in the dark in sulfuric acid solution. The morphology and (photo)electrochemical properties of the porous layer were investigated. Submicron pits 10 to 30 μm apart were formed at the surface. Below the surface, the pits acted as the nuclei of distinct por…
SiO 2 and SnO 2 colloids are capped with a cationic dye, rhodamine 6G, by electrostatic interaction. The close packing of these dye molecules on the negatively charged SiO 2 or SnO 2 colloid results in the formation of H-aggregates. These aggregates are nonfluorescent but can inject electrons from the excited state in…
Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy has been used to determine the average near-surface orientation of chains in a buffed polyimide film. Auger and total electron yield measurements provide powerful and direct means of determining the orientation of chains as a function of depth. In the cas…
Modification of soy protein film properties by heat-curing was studied. Glycerin-plasticized films were cast from alkaline aqueous solutions of soy protein isolate. Films were heated at 80 or 95C for 2, 6, 14, or 24 h. Tensile strength (TS), elongation at break (E), moisture content (MC), water solubility (WS), water…
The intercalation of poly(ethylene oxide) (PEO) in layered V 2 O 5 xerogel and the structural and physicochemical characterization of the products is reported. The synthesis of PEO/V 2 O 5 nanocomposites is achieved by simply mixing aqueous solutions of PEO with aqueous V 2 O 5 gels followed by slow water evaporation.…
A solvated complex of alpha-H(4)SiW(12)O(40).4HMPA.2H(2)O composed the heteropolytungstate alpha-H(4)SiW(12)O(40) and the organic substrate hexamethylphosphoramide (HMPA) has been synthesised, purified, and characterized. The electronic spectra (lambda = 220-500 nm) as well as the (1)H NMR spectra for the title compou…
Well-defined graft copolymers with polyisoprene backbones and polystyrene branches, having trifunctional branch points, of the type S 2 IS 2 (H-shaped) and (SI)I(SI) (π-shaped) were synthesized by anionic polymerization high-vacuum techniques. The synthetic strategy involves the preparation of the outer parts of the m…
Dornoic acid (DA) production by Pseudo-nitzschia multiseries (Hasle) was studied at various silicate concentrations and under silicate perturbation. Both slowly dividing and non-dividing pop-ulation~ produced DA, and the production rates were inversely correlated with the ambient silicate concentrations. Production of…
A two-step, generally applicable synthetic approach for NLO side-chain aromatic polyimides was developed. This is a one-pot preparation of a preimidized, hydroxyl polyimide, followed by the covalent bonding of a chromophore onto the backbone of the polyimide via a mild post-Mitsunobu reaction. NLO side-chain aromatic…
The interlayer aluminol surface of kaolinite has been modified by the reaction of methanol, at temperatures between 200 and 270 °C, with both the dimethyl sulfoside intercalate of kaolinite (Kao–DMSO) and the N-methylformamide intercalate of kaolinite (Kao-NMF). The product was a methoxy-functionalized organomineral m…
In order for boron neutron capture therapy (BNCT) to be successful, a large number (approximately 10(9)) of 10B atoms must be delivered to each cancer cell in order to sustain a lethal 10B(n, alpha)7Li reaction. The majority of high grade gliomas express an amplified epidermal growth factor receptor (EGFR) gene, and i…
Surface structure, obtained from atomic force microscopy and X-ray reflectivity, and surface chemical analysis data, obtained from X-ray photoelectron and static secondary ion mass spectroscopy, are reported for blends of poly( p -bromostyrene) with poly(deuteriostyrene). When high speeds are used in the spin-coating…
The relationship between the fracture toughness ( G c ) and the areal density of diblock copolymer at the interface (Σ) was investigated for joints between polypropylene (PP) and polyamide-6 (PA6), two incompatible, semicrystalline polymers. Diblock copolymers were formed in situ by reaction between succinic acid grou…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperconductivity at 5.2 K in an Electron Donor Radical Salt of Bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) with the Novel Polyfluorinated Organic Anion SF5CH2CF2SO3-Urs Geiser, John A. Schlueter, H. Hau Wang, Aravinda M. Kini, Jack M. Williams, Paul P. Sche, Hali…
In order to study the effect of organic surface chemistry on calcite nucleation, attachment, and growth, calcium carbonate was precipitated in the presence of various ultrathin-film organosilane-modified silicon wafers. The chemistry of the aminosilane surfaces was systematically changed by the coupling of various aci…
A bicapped, highly reduced vanadylpolymolybdophosphate Keggin complex [(C2H5)3NH]5[PMoV6MoVI6O40(VIVO)2], (TEA) 1, has been prepared hydrothermally and characterized by single-crystal X-ray diffraction, IR, UV/visible, cyclic voltammetry, elemental analysis, redox titration, and 51V and 31P NMR on its degradation prod…
The syntheses of 3,4- and 4,5-diiodophthalonitriles are described. Coupling of the latter compound with Pd(PPh(3))(2)Cl(2) and 1-octyne, 1-heptyne, 1-hexyne, 1-pentyne, and 3,3-dimethyl-1-butyne gave a series of 4,5-dialkynylphthalonitriles. Hydrogenation of 4,5-bis(1-pentynyl)phthalonitrile and 4,5-bis(3,3-dimethyl-1…
Three compounds with formula [Mn(L)(2)(N(3))(2)](n)(), in which L is 4-acpy = 4-acetylpyridine (1), Etinc = ethyl isonicotinate (2), and py = pyridine (3), have been studied from the magnetic point of view. The new compound [Mn(L)(2)(N(3))(2)](n)() (2) crystallizes in the monoclinic system, space group P2(1)/a (No. 14…