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 structure of an adsorbed polymer layer in equilibrium with a dilute good solvent is considered theoretically. It is shown that under saturation conditions the tails of the polymer chains give an important contribution to the monomer density profile in the outer layer away from the wall: the tail contribution domin…
Surface composition of a series of segmented poly(siloxane urea urethane)'s have been determined by angle- and energy-dependent ESCA. The polymers are based on aminopropyl end-capped dimethylsiloxane oligomers, isophorone diisocyanate and 1,4-benzene dimethanol. Effects of segmental length and annealing on the surface…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScalar Relativistic Effects on 17O NMR Chemical Shifts in Transition-Metal Oxo Complexes. An ab Initio ECP/DFT StudyMartin Kaupp, Vladimir G. Malkin, Olga L. Malkina, and Dennis R. SalahubCite this: J. Am. Chem. Soc. 1995, 117, 6, 1851–1852Publication Date (Print):February 1…
Artificial dielectric superlattices of SrTiO 3 /BaTiO 3 (STO/BTO) have been formed by a pulsed laser ablation technique with in situ monitoring of reflection high-energy electron diffraction (RHEED) oscillation. The superlattices with a stacking periodicity of a few unit cells show higher dielectric constant than that…
The plastic deformation of icosahedral Al-Pd-Mn single quasicrystals has been studied by in situ straining experiments in a high-voltage electron microscope at elevated temperatures. The results provide the first direct evidence for dislocation motion in quasicrystals. The dislocation velocity, for an applied stress o…
The Cu L2,3-edge x-ray absorption fine structures (XAFS) of a series of Cu samples have been recorded at the BL1A beamline of UVSOR using both electron yield and x-ray fluorescence yield techniques. XAFS measurements were simultaneously recorded in three modes: total electron yield (TEY) with specimen current, total e…
Abstract Phenolphthalein poly(ether ketone) (PEK‐C) was tested using an instrumented impact tester to determine the temperature effect on the fracture toughness K c and critical strain energy release rate G c . Two different mechanisms, namely the relaxation processes and thermal blunting of the crack tip were used to…
Abstract 1,2 : 5,6-Bis(ethylenedithio)pyracylene (2) was synthesized as an example of molecular design for a polyaromatic condensed-type donor with two ethylenedithio groups at the periphery. The redox potential of 2 indicates that this heterocycle is a reversible two-stage redox system with low oxidation potentials,…
Abstract A review of work which has been performed on high temperature polymer blends is presented. The discussion is divided into miscible and immiscible blends. It is pointed out that one problem with miscible polymer blends is that of processing in the miscible state. In the case of immiscible blends, particularly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Structure of [Aib-COCO-Aib]Cu2: A Unique Example of Modular Self-AssemblyDarshan Ranganathan, Narendra K. Vaish, G. V. R. Chandramouli, Babu Varghese, Rajendra Bose Muthukumaran, and Periakaruppan T. ManoharanCite this: J. Am. Chem. Soc. 1995, 117, 5, 1643–1644Public…
The first evidence for a calmodulin-like protein in an archaeon, Halobacterium salinarium, is reported here. The calmodulin-like protein, with a molecular mass of 24 kDa and an estimated pI of 4.8, stimulated cyclic nucleotide phosphodiesterase in a calcium-dependent manner. This stimulation could be suppressed by cal…
The cubic–tetragonal (c–t) phase transition in ZrO2−CeO2 is studied using samples prepared by both arc melting and sintering methods. The c–t transition proceeds during isothermal annealing at temperatures between 200 and 400°C in sintered samples, whereas the transition is induced after high temperature annealing at…
Seven computer codes developed by five groups are applied to the benchmark problem 13 of the TEAM Workshop which consists of steel plates around a coil (a nonlinear magnetostatic problem). The solutions are compared with each other and with experimental results.
The effects of sintering temperature above 1000°C and of cooling rate on the microstructual development of pure and Zn‐substituted spinel lithium ferrites are discussed. The strong dependence of microstructural features on cooling rate can be explained on the basis of the precipitation of α‐Fe 2 O 3 or the formation o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Modulus and High Tg Thermally Stable Polymers from p-Ethynyl-Terminated Monomers. 3Anastasios P. Melissaris, James K. Sutter, Morton H. Litt, Daniel P. Scheiman, and Marla A. SchuermanCite this: Macromolecules 1995, 28, 4, 860–865Publication Date (Print):February 1, 199…
Abstract The temperature dependence of the I K-edge extended X-ray absorption fine-structure (EXAFS) spectra of a highly oriented iodine-containing polyvinyl alcohol (I-PVA) film was investigated in order to reveal any local structures around I. It was firstly demonstrated that an analysis of the EXAFS amplitude, whic…
The crystal structure of \ensuremath{\alpha}-[(${\mathrm{CH}}_{3}$${)}_{2}$(${\mathrm{C}}_{2}$${\mathrm{H}}_{5}$${)}_{2}$N][Ni(dmit${)}_{2}$${]}_{2}$ (dmit=1,3-dithiol-2-thione-4,5-dithiolate) was determined at 11 K by use of a newly developed x-ray system based on an imaging plate equipped with a closed-cycle He refr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInsertion Chemistry of HTc(CO)3(PPh3)2Jessica Cook, Alan Davison, William M. Davis, and Alun G. JonesCite this: Organometallics 1995, 14, 2, 650–655Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published inissue 1 February 1995https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadical Anion Complexes of Tris(1,3-diphenyltriazenido)aluminumJanet Braddock-Wilking, John T. Leman, Christian T. Farrar, Sarah A. Cosgrove-Larsen, David J. Singel, and Andrew R. BarronCite this: J. Am. Chem. Soc. 1995, 117, 6, 1736–1745Publication Date (Print):February 1,…
A new beamline for macromolecular crystallography has been constructed and is currently under commissioning. Its source is the high-power wiggler at the 2 GeV storage ring ELETTRA. The optics consists of a double-crystal monochromator in nondispersive configuration followed by a toroidal focusing mirror, and is design…