Materials Literature
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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…
The synthesis of low molecular weight (M n (NMR) < 7000 g/mol) lactic acid prepolymers by condensation polymerization of l -lactic acid was investigated. Besides the l -lactic acid polymer, hydroxyl- and carboxyl-terminated telechelic prepolymers were also prepared by the addition of small amounts of 1,4-butanediol an…
Effects of macroscopic residual stresses on fracture toughness of multilayered ceramic laminates were studied analytically and experimentally. Stress intensities for edge cracks in three‐layer, single‐edge‐notch‐bend (SENB) specimens with stepwise varying residual stresses in the absence of the crack and superimposed…
Diblock copolymers order into a variety of periodic morphologies when the constituent blocks are sufficiently incompatible. Previous studies have demonstrated that classical dispersion (spherical and cylindrical) and lamellar morphologies, as well as complex morphologies ( e.g., gyroid*, lamellar catenoid, and hexagon…
Titania coatings ranging from sub-monolayer to ≈7 nm thick have been deposited on silica by hydrolysis of titanium alkoxide precursors. Nonporous model silica particles of spherical shape were used as the support for titania. The ratio of titanium alkoxide to water and the dilution of the reactant mixture in ethanol c…
4-Nitrophenyl 4-[[2-[(2-methyl-1-oxo-2-propenyl)oxy]ethyl]oxy]benzoate (BEM) was synthesized and copolymerized with 4‘-[[[2-[(2-methyl-1-oxo-2-propenyl)oxy]ethyl]ethyl]amino]-4-nitroazobenzene (DR1M) in dioxane at 60 °C. BEM and DR1M copolymerize in a random fashion with reactivity ratios r DR1M = 0.82 and r BEM = 1.0…
We have observed what appears to be a first-order phase change from deeply supercooled liquid triphenyl phosphite at 1 atm to a rigid, “apparently” amorphous phase which we denote as the “glacial phase”. This is a new, crisper, and rather different addition to the examples of polyamorphism that have recently been stud…
Al-free Ti-β zeolite spontaneously nucleates and grows in a reaction mixture containing tetraethylammonium and fluoride ions at near neutral pH, and shows an enhanced crystallinity and thermal and hydrothermal stability as well as a significant hydrophobic character.
We use self-consistent mean field methods and analytical theory to determine the behavior of AB copolymers at the interface between two incompatible homopolymers, A and B. We calculate the reduction in interfacial tension, γ, resulting from the copolymers localizing at the A/B interface. We examine the effects of chai…
Gallium-doped zinc oxide powders have been prepared with electrical conductivities at 25 °C as high as 300 Ω - 1 cm - 1, more than 1000 higher than previously reported. All materials prepared can be represented as Zn 1 - x Ga x O, Zn 1 - y Ga y O 1+( y /2), or a combination of these two. For Zn 1 - x Ga x O, the room-…
End-functional aliphatic polyesters have been synthesized by ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) and lactides (LA). Polymerization initiated with any of the functional aluminum alkoxides of the general structure Et 3- p Al(OCH 2 X) p, where p = 1 and 3, obeys a living “coordination−insertion” me…
Mesoporous, high-surface-area zirconium(IV) oxide may be prepared by incorporation of cationic quaternary ammonium surfactants in the hydrous oxide and subsequent calcination of the inorganic/organic intermediate. The surfactants are incorporated by cation exchange at a pH above the isoelectric point of the hydrous ox…
We have discovered a solid, apparently amorphous phase of triphenyl phosphite to which the supercooled liquid converts, a phase distinct from both the glass and the crystal. To date, this is the clearest and best identified case of a first-order transition from a liquid to another apparently amorphous condensed phase.…