Materials Literature
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The buildup of the first layers of a polystyrenesulfonate (PSS)/polyallylamine (PAH) multilayer is studied in situ by means of streaming potential measurements (SPM) and by scanning angle reflectometry (SAR). The results are discussed in the framework of a schematic representation of the multilayer in three zones: a p…
The MgSO 4 :Dy, P and MgSO 4 :Dy, P, Cu phosphors have been developed and studied by the thermoluminescence (TL) glow curves and dose responses to gamma radiation. The TL sensitivity of MgSO 4 :Dy, P phosphor is higher than that of LiF:Mg, Ti. One main dosimetric peak at about 283.6 °C and a satellite peak at about 35…
Stoichiometric LiMn 2 O 4 undergoes a structural phase transition close to room temperature from cubic to orthorhombic symmetry. The crystal structure at 230 K (space group Fddd and a = 24.743(1), b = 24.840(1), and c = 8.199(1) Å) corresponds to an orthorhombic ∼ 3a × 3a × a superstructure of the cubic spinel structu…
The cuboctameric hydroxysilsesquioxane ( c -C 5 H 9 ) 7 Si 8 O 12 (OH) ( 2 ), obtained after hydrolysis of ( c -C 5 H 9 ) 7 Si 8 O 12 Cl ( 1 ), and triphenylsilanol have been applied as model supports for silica-grafted olefin polymerization catalysts. The ligands were introduced on group 4 metals by either chloride m…
The formation of fatty plaques (atherosclerosis) that clog arteries is one of the most common forms of cardiovas-cular disease. The only permanent solu-tion is surgical replacement of diseased arteries with healthy autologous veins (that is, veins from the same patient). However, this type of surgery is only possible…
We used our previously implemented GW approximation (GWA) based on the all-electron full-potential projector augmented wave (PAW) method to study the optical properties of small, medium and large-band-gap semiconductors: Si, GaAs, AlAs, InP, Mg$_2$Si, C, and LiCl. The aim being to study the size of both local-field (L…
We have studied the dynamics of electrons in single wall carbon nanotubes using femtosecond time-resolved photoemission. The lifetime of electrons excited to the pi* bands is found to decrease continuously from 130 fs at 0.2 eV down to less than 20 fs at energies above 1.5 eV with respect to the Fermi level. This shou…
It was recently reported that water soluble conducting polyaniline may be prepared using a new template-guided enzymatic approach. To address the mechanistic role of the template in this reaction, various macromolecular and surfactant templates were investigated. It was found that the template provides a necessary typ…
Lewis acid mediated hydrosilylation of alkynes and alkenes on non-oxidized hydride-terminated porous silicon derivatizes the surface with alkenyl and alkyl functionalities, respectively. A very broad range of chemical groups may be incorporated, allowing for tailoring of the interfacial characteristics of the material…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEnvironment-Sensitive Stabilization of Core−Shell Structured Polyion Complex Micelle by Reversible Cross-Linking of the Core through Disulfide BondY. Kakizawa, A. Harada, and K. KataokaView Author Information Department of Materials Science Graduate School of Engineeri…
Reactions of [Fe II (CN) 2 (bpy) 2 ] and [Fe III (CN) 2 (bpy) 2 ](PF 6 ) with [Cu II (bpy)(CH 3 OH) 2 ](PF 6 ) 2 in methanol yielded cyanide-bridged cyclic tetranuclear complexes of [Fe II 2 Cu II 2 (μ-CN) 4 (bpy) 6 ](PF 6 ) 4 ·2H 2 O·4CHCl 3 ( 1 ) and [Fe III 2 Cu II 2 (μ-CN) 4 (bpy) 6 ](PF 6 ) 6 ·4CH 3 CN·2CHCl 3 (…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis of [28]Heptaphyrin(1.0.0.1.0.0.0) and [32]Octaphyrin(1.0.0.0.1.0.0.0) via a Directed Oxidative Ring Closure: The First Expanded Porphyrins Containing a Quaterpyrrole SubunitJonathan L. Sessler, Daniel Seidel, and Vincent LynchView Author Information Departmen…
We present a detailed molecular-dynamics study of the diffusion and coalescence of large (249-atom) gold clusters on graphite surfaces. The diffusivity of monoclusters is found to be comparable to that for single adatoms. Likewise, and even more important, cluster dimers are also found to diffuse at a rate which is co…
We study several one dimensional step flow models. Numerical simulations show that the slope of the profile exhibits scaling in all cases. We apply a scaling ansatz to the various step flow models and investigate their long time evolution. This evolution is described in terms of a continuous step density function, whi…
Polypropylene now has a history of nearly 45 years since its discovery and 40 years since its commercialization. It has established itself as one of the most important polymers that has engineering plastic properties at commodity plastics prices. The end of the growth of polypropylene is not in sight.
With a view to further refining the use of the exceptional group G 2 in atomic and nuclear spectroscopy, it is confirmed that a simple finite subgroup L 168 ~ PSL 2 (7) of order 168 of the symmetric group S 8 is also a subgroup of G 2 . It is established by character theoretic and other methods that there are two dist…
Traditional stabilization systems for polypropylene are typically based on a binary combination of a phenolic antioxidant and a phosphorus based melt processing stabilizer. The phenolic antioxidant provides melt processing stability as a hydrogen atom donor and free radical scavenger; it also provides the polymer with…
For spin-polarized low-energy electrons impinging on non-magnetic crystalline surfaces, the collision with a valence electron and the ensuing emission of an electron pair are treated in a distorted-wave Born approximation formalism with exchange, in which the four relevant quasi-one-electron states are solutions of th…
The progresses obtained in both catalyst performances and process technologies have made the continuous expansion of PP properties possible. The discovery of MgCl2-supported catalysts and the development of their controlled spherical morphology produced a real revolution in the catalytic-system performances. A series…
We have shown in the present article, starting from the high capacity PP′s on the market, the development of long-chain branched PP which means melt strength PP. As a basis, the radical mechanism were used to synthesize long-chain branched PP. Most known is the process at low temperature by using electron-beam-irradia…