Materials Literature
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The synthesis and characterization of the previously unknown mixed-metal sandwich-type Wells–Dawson complexes, αββα-[(Zn II OH 2 ) 2 (Fe III ) 2 (P 2 W 15 O 56 ) 2 ] 14– ( Zn 2 Fe 2 P 4 ) and αββα-[(Zn II OH 2 ) 2 (Fe III ) 2 (As 2 W 15 O 56 ) 2 ] 14– ( Zn 2 Fe 2 As 4 ), are described. The complexes are prepared by th…
The effect of film thickness and surface preparation techniques on contact angles of water, 1-bromonaphtalene, and n-hexadecane on Teflon® AF 1600 polymeric surfaces is studied. It was found that contact angles of water on different thicknesses of spin-coated films ranging from 27 nm to 420 nm are essentially constant…
[reaction: see text] Dendritic architectures with neutral core structures and amines groups in the shell are a synthetic challenge, and there is a need for an efficient access. In this paper, highly selective Rh-catalysts are used for sequential hydroformylation/reductive amination of dendritic perallylated polyglycer…
We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficien…
We report the syntheses of self-catalyst-grown and self-assembled ZnO nanoscrews (ZNS). The morphology and microstructures were characterized by using scanning electron microscopy, transmission electron microscopy and x-ray diffraction. The results reveal that the aligned ZNS are single crystalline grown along the c a…
Zn 0.9 Mn 0.1 O and Zn0.85Mn0.1Cu0.05O thin films were grown by the pulsed laser deposition technique on R-cut Al2O3 substrates under various conditions. Both Zn0.9Mn0.1O and Zn0.85Mn0.1Cu0.05O films that were fabricated at 650 °C under an oxygen pressure of 0.1 Torr show ferromagnetism (FM) above room temperature. It…
We present a brief summary of new technical developments of passive and active vibration controls which we have performed for the last several years partly as an international collaborative R&D project on Smart Materials and Structural Systems sponsored by the Japanese Ministry of Economy, Trade and Industry. In conne…
We report on the synthesis of the magnetoelectric BaFe1−xZrxO3−δ (x=0.5 and 0.7) single-crystalline films whose magnetic and leakage properties have been greatly improved. The films were found to be excellent insulators, up to the leakage current density of about 1.1×10−5A∕cm2 at the bias electric field of 150kV∕cm fo…
The phase behavior of symmetric styrene−isoprene (SI) diblock copolymers in selective solvents in the vicinity of the order−disorder transition (ODT) was investigated by small-angle neutron scattering (SANS). Particular emphasis is placed on the region just above the ODT, where a disordered phase of micelles is observ…
The electron-field-emission (EFE) behavior of the nanodiamond films was observed to be pronouncedly superior to that of the diamond films with micrometer- or submicrometer-sized grains, which is ascribed to the presence of abundant grains boundaries with sp2 bonds. Incorporation of boron species into the nanodiamond f…
For Abstract see ChemInform Abstract in Full Text.
[reaction: see text] The synthesis of new 18-membered hexaazamacrocycles containing a functionalized 2,2':6',2' '-terpyridine moiety as part of the cyclic backbone and three acetate pendant arms is described. The reported synthetic procedure is based on the use of an efficient metal template ion effect which controls…
The specific heat capacity was measured with step-scan differential scanning calorimetry for linear alkanes from pentane (C(5)H(12)) to nonadecane (C(19)H(40)), for several cyclic alkanes, for linear and cyclic polyethylenes, and for a linear and a cyclic polystyrene. For the linear alkanes, the specific heat capacity…
The understanding of the nature of recognition of inorganic materials by proteins is one of the core elements of and has profound implications in biological materials science and engineering. Using combinatorial display methods, a considerable number of short polypeptides have recently been selected with affinity to e…
A dicyano-containing [Fe(bpb)(CN)2]- building block has been employed for the synthesis of cyano-bridged heterometallic Ni(II)-Fe(III) complexes. The presence of steric bpb(2-) ligand around the iron ion results in the formation of low-dimensional species: five are neutral NiFe2 trimers and three are one-dimensional (…
Three isomeric zinc bisporphyrins have been prepared by covalently linking together two aminoporphyrins with an isophthalic acid derivative. The porphyrins differ in the substitution pattern on the meso phenyl groups, that is, ortho, meta, or para. Titrations carried out by UV-visible and 1H NMR spectroscopy have been…
Low vacuum scanning electron microscopy (SEM) is a high-resolution technique, with the ability to obtain secondary electron images of uncoated, nonconductive specimens. This feat is achieved by allowing a small pressure of gas in the specimen chamber. Gas molecules are ionized by primary electrons, as well as by those…
The essential role of strain in determining the electronic states of perovskite manganites is clearly demonstrated in the form of anisotropic and substrate-dependent crossover of a first-order phase transition in charge-orbital ordered epitaxial thin films of ${({\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Pr}}_{x})}_{0.5…
[reaction: see text] The behavior of porphyrins as dipolarophiles in 1,3-dipolar cycloadditions with azomethine ylides was studied. Depending on the nature of the substituent groups on the porphyrin macrocycles, the reaction can give monoadducts (chlorins) or bisadducts (isobacteriochlorins and bacteriochlorins). When…
An in-depth analysis of the deterioration mechanisms in high-strength wires of suspension bridge cables is presented. Accelerated cyclic corrosion tests were conducted to assess the relative effect of corrosion on galvanized and ungalvanized wires. Samples were corroded under various levels of sustained loads in a cab…