Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Isotherms have been determined for the adsorption of polyvinylpyrrolidone (PVP) samples of various molecular mass (10 4 to 2.5 × 10 6 ) onto anionic polystyrene (PS) latices from both water and 0.5 M NaCl. The adsorption capacity, Γ ads, was found to be about 0.7 mg m -2 from water and was independent of the PVP molec…
The synthesis and characterization of novel non-centrosymmetrically push-pull substituted metal-free phthalocyanines 3 − 9 are described. The compounds have different donor (dialkoxy, tert -butyl, methyl, p -tolylthio) and/or attractor ( p -tolylsulfinyl, p -tolylsulfonyl, nitro) functional groups, are soluble in orga…
ε-Caprolactone polymerization using an initiating system comprising tris(2,6-di- tert -butylphenoxy)yttrium and 2-propanol was first-order in monomer and initiator. A propagation rate constant of 1.65 L·mol -1 ·s -1 was determined in dichloromethane. The reaction proceeds via a three-step mechanism. In the first step…
The effect of crystallinity on the photoreduction of cerium oxide (Ce 4+ to Ce 3+ ) during X-ray photoelectron spectroscopy (XPS) analysis of CeO 2 and Ce/Al 2 O 3 catalysts has been determined. Cerium oxide samples were prepared by calcining cerium(IV) methoxyethoxide in air at different temperatures. The structure o…
FT-IR spectroscopy, synchrotron SAXS, and dynamic rheometry have been employed to monitor, in-situ, structure development during the reactive processing of model flexible polyurethane foam systems. The following combinations of components were investigated: (I) diisocyanate, polyether polyol, and water and (II) diisoc…
The coordination chemistry of 2,2'-dipyridyl diselenide (PySeSePy) (2) (C(10)H(8)N(2)Se(2)) has been investigated and its crystal structure has been determined (monoclinic, P2(1)/c, a = 10.129(2) Å, b = 5.7332(12) Å, c = 19.173(3) Å, beta = 101.493(8) degrees, Z = 4). In metal complexes the ligand was found to coordin…
Unsymmetrical phthalocyanine analogues with three 15-crown-5 ether voids at the 3,4-positions (MtNIL, MtBZ, MtNAP) (Mt = Zn, Cu) have been synthesized and characterized. Their dimerization is induced by addition of some cations, particularly Rb 2+ and K + . Cofacial dimer formation in the presence of these cations pro…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Ordering of Diblock Copolymers from SolutionZ. Li, W. Zhao, Y. Liu, M. H. Rafailovich, J. Sokolov, K. Khougaz, A. Eisenberg, R. B. Lennox, and G. KrauschView Author Information Department of Materials Science and Engineering State University of New York at Stony B…