Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of Hyperbranched Polymer Films Grafted on Self-Assembled MonolayersYuefen Zhou, Merlin L. Bruening, David E. Bergbreiter, Richard M. Crooks, and Mona WellsView Author Information Department of Chemistry, Texas A&M University College Station, Texas 77843-325…
The testing method for delayed fracture has not been standardized yet. The quantitative evaluation method is necessary to develop low alloy high strength steels with higher delayed fracture resistance. The sustained load tests under cathodic hydrogen charging condition have been investigated considering the severity o…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelective Catalytic Oxidation of Substrates That Bind to Metalloporphyrin Enzyme Mimics Carrying Two or Four Cyclodextrin Groups and Related MetallosalensRonald Breslow, Xiaojun Zhang, Ruo Xu, Milana Maletic, and Roland MergerView Author Information Department of Chemi…
Silanization has rendered spherical (75 ± 5 μm diameter) glass particles to be weakly (sample A, ϑ = 55°), moderately (sample B, ϑ = 72°), and highly (sample C, ϑ = 90°) hydrophobic. Nonequilibrium surface pressure (Π) vs surface area ( A ) isotherms have been determined for monoparticulate layers which were prepared…
CO adsorption on palladium–ceria catalysts prepared from Pd acetylacetonate has been investigated by IR and UV–VIS spectroscopies and by volumetric measurements. After calcination and evacuation at 673 K, the samples contain small PdO particles which are immediately reduced upon adsorption of CO at room temperature. F…
We use self-consistent-field calculations and scaling arguments to determine the behavior of AB diblock copolymers that are tethered to a surface. While the surrounding solution is assumed to be a poor solvent for both components, the B block is considered to be less soluble than the A. The solvophobic interactions wi…
A one-dimensional compound with a Mn(III)−NC−Fe(III) linkage of the formula of [NEt 4 ] 2 [Mn(acacen)][Fe(CN) 6 ] (NEt 4 = tetraethylammonium, acacen = N, N ‘-ethylenebis(acetylacetonylideneaminato)) has been prepared by the assembly reaction of [Mn(acacen)Cl] and [NEt 4 ] 3 [Fe(CN) 6 ] in ethanol/2-propanol. The comp…
Heteropolyacids (HPAs) possess both acidic and redox catalytic properties and held extensive promise of practical application. These type of compound display a great potential of specific synthesis reactions for replacing sulfuric acid to satisfy the requirements of environmental protection. Heterogenizing HPAs would…
The synthesis, crystal structure, and properties of [Mn II (MCPA) 2 (H 2 O) 2 ] n (MCPA = 2-methyl-4-chlorophenoxyacetic acid), 1, a 2-D manganese carboxylato polymer is reported. The synthesis of 1 has been achieved via the reaction of MCPA with MnCl 2 ·2H 2 O and NaHCO 3 in methanol. Crystal structure data: [C 18 H…
A new conjugated aromatic poly(azomethine) derivative, poly(3‘,4‘-dibutyl-α-terthiophene−azomethine-1,4-phenylene−azomethine) (PBTPI), has been prepared by polycondensation of 2,5‘‘-diformyl-3‘,4‘-dibutyl-2,2‘:5‘,2‘‘-terthiophene with 1,4-phenylenediamine under the ethanothermal conditions. The red polycrystalline PBT…
This paper presents results on magneto-impedance (MI) in a NiFe/Co/NiFe sandwich film of 0.2 /spl mu/m thickness, which exhibits the impedance change up to 8% for a field of 4 Oe at a frequency of 400 MHz. The effect of voltage change with the field can be especially large (/spl sim/200% for 5 Oe) if the sandwich film…
Use of carbon materials is no longer limited to diamond jewelry or graphite pencils and lubricants. The last decade has witnessed an explosion of technological applications driven by the development of fabrication methods and the discovery of several new classes of pure carbon. Structural diversity exhibited by the ca…
The chemistry of thorium phosphate reported in the literature has been found to be erroneous. It was reconsidered in terms of careful chemical preparations and specific analytical methods. Special attention has been paid to the atom ratio value referred to r = thorium/phosphorus, which was experimentally fixed in orde…
For the first time, an aqueous micellar medium (sodium dodecyl sulfate, SDS) is used, at Pt electrodes, to electrosynthesize poly(3,4-ethylenedioxythiophene)(PEDOT) conducting films deposited at lower potential than in acetonitrile and presenting a well organized structure.
The synthesis and characterization (by optical microscopy, differential scanning calorimetry (DSC), X-ray diffraction) of two series of octasubstituted lipophilic phthalocyanines 1 − 3 and 4 − 7, bearing amide functions in the peripheral chains, are reported. Compounds 1 − 3, 6, and 7 exhibit a liquid-crystal phase, f…
Ring-opened homopolymers of 5-norbornene-2-carboxylates or 5-norbornene-2,3-dicarboxylates that contain acetal-protected sugars ( 1: 1,2:3,4-di- O -isopropylidene-α- d -galactopyranos-6- O -yl 5-norbornene-2-carboxylate; 2: bis(1,2:3,4-di- O -isopropylidene-α- d -galactopyranos-6- O -yl) 5-norbornene- trans -2,3-dicar…
X-ray diffraction (XRD) and transmission electron microscopy (TEM) have been used to characterize microstructural and microchemical changes produced by neutron irradiation in zirconium and zirconium alloys. Zircaloy-2, Zircaloy-4, and Zr-2.5Nb alloys with differing metallurgical states have been analyzed after irradia…
Many biologically formed calcite crystals contain intracrystalline macromolecules. The ways in which they interact with growing calcite crystals were evaluated by monitoring changes in the morphology of calcite crystals grown in vitro in their presence. Macromolecules were extracted from within isolated prisms from th…
Collagens can be distinguished from other proteins based on their triple-helical structure. Synthetic peptide models have been developed to better understand the triple helix structurally and to evaluate the triple helix as a recognition element for biological processes. Associated triple-helical peptides were first d…
Several solution properties of complexes formed between the trivalent lanthanide ions (Ln III ) and the macrocyclic ligand DOTP 8 -, including stability constants, protonation equilibria, and interactions of the LnDOTP 5 - complexes with alkali metal ions, have been examined by spectrophotometry, potentiometry, osmome…