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。
For the first time, new hybrid organic−inorganic materials containing ferri-ferrocyanide and having a well-defined multilayer architecture were successfully obtained using the Langmuir−Blodgett (LB) technique. These LB films present a ferromagnetic behavior below 5.7 K. In this temperature range, their magnetic proper…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of ABA Type Thermoplastic Elastomers Based on PolyacrylatesS. K. Varshney, P. Kesani, N. Agarwal, J. X. Zhang, and M. RafailovichView Author Information Polymer Source, Inc., 771 Lajoie Street, Dorval, Quebec H9P 1G7, Cana…
Chromium oxide was supported on different commercial aluminas. Their characteristics were assessed by different techniques (X-ray diffraction, X-ray photoelectron, laser Raman, and electron paramagnetic resonance spectroscopies, and Brunauer−Emmett−Teller surface, temperature-programmed reduction, and temperature-prog…
Porous silica, niobia, and titania with three-dimensional structures patterned over multiple length scales were prepared by combining micromolding, polystyrene sphere templating, and cooperative assembly of inorganic sol-gel species with amphiphilic triblock copolymers. The resulting materials show hierarchical orderi…
Simple organic molecules can have many functions. The active ingredient in the corrosion inhibitor 3-(4-methylbenzoyl)propionate works because it addresses the metal sites of a surface through carboxylate groups, forms hydrogen bonds with surface hydroxide groups (see picture), and provides excellent surface coverage…
The changes of structure and electronic state of copper ion species during the heat treatment of copper ion-exchanged ZSM-5 zeolite (CuZSM-5) as well as the interaction with CO molecules have been investigated by using various spectroscopic techniques such as infrared (IR) and emission spectroscopy (ES), electron spin…
Removal of the C-terminal seven residues from phosphoglycerate mutase from Saccharomyces cerevisiae by limited proteolysis is associated with loss of mutase activity, but no change in phosphatase activity. The presence of the cofactor 2, 3-bisphosphoglycerate, or of the cofactor and substrate 3-phosphoglycerate togeth…
The hydrophilicity of polymers, as indicated by their swelling characteristics in water, is an important parameter with regard to their use as coatings which are able to modify the wettability and adhesive properties of a material. We have investigated the swelling behavior of a series of hydrophilic random copolymer…
An immensely broad scope of structural motifs is covered by the intriguing chemistry of boron–sulfur and boron–selenium compounds. Characteristic structural features of the binary boron sulfides can be applied to understand and rationalize the three-dimensional atomic arrangement in macromolecular anionic frameworks s…
Self-organization is the key. A series of dendritic pseudorotaxanes were efficiently constructed from complementary building blocks-namely, a three-armed, triply charged ammonium salt and the first, second, and third generations of benzyl ether dendrons bearing the dibenzo[24]crown-8 moiety. The pseudorotaxane arising…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNovel Starlike Poly(methyl methacrylate)s by Controlled Dendritic Free Radical InitiationAndreas Heise, James L. Hedrick, Mikael Trollsås, Robert D. Miller, and Curtis W. FrankView Author Information IBM Research Center, 650 Harry R…
The direct benzene hydroxylation by an iron−oxo species is discussed from density-functional-theory (DFT) calculations. The proposed reaction pathway is FeO + + C 6 H 6 → OFe + (C 6 H 6 ) → [TS1] → HO−Fe + −C 6 H 5 → [TS2] → Fe + (C 6 H 5 OH) → Fe + + C 6 H 5 OH, in which TS means transition state. This reaction is in…
Da hätten wohl auch Platon und Kepler ihre Freude gehabt! Trotz der großen Zahl an Atomen weist das Cluster-Anion 1 eine ikosaedrische Struktur auf – sicherlich ein Novum in der Geschichte der Chemie! Es setzt sich derart aus 12 {Mo11}-Fragmenten zusammen, daß im resultierenden kugelförmigen Gebilde die fünfzähligen D…
By illumination with white light porous silicon surfaces can be functionalized with alkynes and alkenes (see scheme). The hydrosilylation reactions are very simple to perform and lead to stable, patterned surfaces. This methodology opens new opportunities in the technological applications of porous silicon in both int…
The rational synthesis and the structural and magnetic characterization of three different nickel clusters encapsulated in Keggin trivacant fragments are presented. The three complexes show how it is possible to increase the nuclearity of the clusters (from 3 and 4 to 9) by slightly changing the synthetic conditions.…
Incarcerated in a helical prison: The encapsulation of a PF6− ion within a quadruply stranded helicate (shown schematically) results from the self-assembly of four molecules of 1,4-bis(3-pyridyloxy)benzene and two PdII ions. This represents not only the first example of a coordinatively saturated quadruple helicate, b…
We performed coarse-grained simulations of thin polyethylene films of different thicknesses at 509 K. The films, which present two surfaces to vacuum, are formed from monodisperse melts of C 100 H 202 . The mobility increases toward the free surfaces at the scale of individual beads and chains due to the decrease in d…
The preparation and characterization of several (nitro)(nitrosyl)iron(III) complexes, [Fe(Porph)(NO 2 )(NO)], where Porph = tetraphenylporphyrin, octaethylporphyrin, tetra- p -methoxyphenylporphyrin, or picket fence porphyrin, are described. Crystal data: [Fe(T p -OCH 3 PP)(NO 2 )(NO)]·CH 2 Cl 2, tetragonal, space gro…
A new procedure is described for the formation of a hyperbranched poly(ether ketone) with carboxylic acid terminal groups. This preparation was based on the one-step synthesis of an AB 2 -type monomer 5-phenoxyisophthalic acid using phosphorus pentoxide/methanesulfonic acid as the condensing agent and solvent. The ele…
Surface modifications of Ar plasma-pretreated poly(tetrafluoroethylene) (PTFE) film via UV light-induced graft copolymerization with 1-vinylimidazole (VIDz) and glycidyl methacrylate (GMA) were carried out to improve the adhesion with evaporated copper. The surface compositions of the graft-copolymerized PTFE films we…