Materials Literature
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Different sizes of core-functionalized metallodendritic wedges were prepared by anchoring sensor-active arylplatinum(II) sites at the focal point of Fréchet-type polyether dendritic wedges of various generations. The strong color of these metallodendrimers in the presence of SO2 was used to assess the permeability of…
At 4 GPa and 900°C, hexagonal high-pressure LiGe—a Zintl phase—with a new structural motif was prepared: isolated hexagonal channels built up by three-coordinate Ge− ions. These channels consist of puckered germanium six-membered rings of distorted chairs and boats (see picture). Li+ counterions are found in the cente…
Eine dynamische Oberfläche kann die Migration anhaftender Zellen auslösen: Bei einer selbstorganisierten Monoschicht mit exponierten Hydrochinon-Einheiten wurden diese durch elektrochemische Oxidation in Benzochinon-Einheiten überführt, woran sich eine Diels-Alder-Reaktion mit einem Cyclopentadien-modifizierten Peptid…
Abstract The miscibility of poly(vinyl alcohol) (PVA)/methylcellulose (MC) blends was investigated over the entire composition range using the dynamic mechanical analyzer (DMA) and the differential scanning calorimeter (DSC). On the basis of the glass transition temperature, determined by DMA, one could conclude that…
The changes in the layered structure of Mg-Al hydrotalcite (Mg/ Al = 2) during heat treatment have been investigated by using in situ XAFS simultaneously at the Mg and Al K-edges. The development of unique in situ instrumentation allowed the coordination environments at both the Mg and Al centers to be monitored as a…
Silver double salts containing embedded C22− ions have been isolated by using [15]crown-5 (15C5) as a structure-directing agent. Unprecedented low dimensionalities are found for these compounds, which exist either as discrete molecules or as a zigzag chain. They feature different kinds of silver cages each sandwiched…
A novel field-induced approach has been developed that allows the controlled ordering of colloidal particles in confined systems. In this approach, an electric field is used to create a strong lateral dipole−dipole interaction that induces colloidal crystallization in two-dimensional geometries. Because the particle d…
Abstract Perfectly‐alternating linear (AB) n multiblock copolymers consist of n AB block pairs covalently linked in an alternating sequence. Although these copolymers can microphase‐order in the same fashion as their lower‐order ( n = 1) diblock analogs, the 2( n − 1) biconformational midblocks comprising each copolym…
Abstract Conductive polymeric based composites were derived from ethylene vinyl acetate rubber filled with Vulcan XC‐72, short carbon fiber (SCF), and their blends. The electromagnetic interference (EMI) shielding effectiveness (SE), return loss, and reflection coefficient were studied. The measurements of the SE of t…
We measured dynamic shear moduli of poly(macromonomer)s of an increased backbone chain length and those bearing branch chains of increased branch length up to the critical molecular weight for the intermolecular chain entanglement, M c, of a linear polystyrene as functions of frequency and temperature using a parallel…
Sonochemical and microwave-assisted polyol reduction methods were used to prepare PbSe and PbTe. Products prepared by both methods were compared and analyzed by XRD, EDX, TEM, HR-TEM, elemental analysis, FT-IR, and thermal methods (DSC and TGA). In both methods almost pure lead chalcogenide phases were prepared, which…
A “cyclodextrin coat” dramatically enhances the stability of an azo dye towards reductive bleaching, oxidative bleaching, and photo-bleaching as is demonstrated by the rotaxane 1. This compound is obtained as a single isomer in high yield from the amine-substituted dye and trichlorotriazine in water in the presence of…
Caged cyclic nucleotides exhibiting remarkable advantageous properties have been developed through the use of novel photolabile coumarinylmethyl protecting groups (see scheme). They serve as excellent intracellular sources of cAMP and cGMP and allow the study of spatial- and time-dependent aspects of cyclic nucleotide…
A planar decanuclear 30-membered core ring is present in the new manganese (see picture) and iron [30]azametallacrown-10 compounds. These compounds were prepared by using the pentadentate ligand N-phenylsalicylhydrazidate, and the metal atoms in each ring adopt a propeller configuration and have alternating Λ/Δ stereo…
The linear combination of bulk bands method recently introduced by Wang, Franceschetti and Zunger [Phys. Rev. Lett.78, 2819 (1997)] is applied to a calculation of energy bands and optical constants of (GaAs)$_n$/(AlAs)$_n$ and (GaAs)$_n$/(vacuum)$_n$ (001) superlattices with n ranging from 4 to 20. Empirical pseudopot…
The mean-field theory represents a useful starting point for studying carrier-induced ferromagnetism in Mn$_x$III$_{1-x}$V diluted magnetic semiconductors. A detail description of these systems requires to include correlations in the many-body hole system. We discuss the effects of correlations among itinerant carrier…
A time-dependent global fiber-bundle model of fracture with continuous damage is formulated in terms of a set of coupled non-linear differential equations. A first integral of this set is analytically obtained. The time evolution of the system is studied by applying a discrete probabilistic method. Several results are…
Magnetization and magnetoresistance measurements are reported for antiferromagnetically coupled DyFe$_2$/YFe$_2$ multilayers in fields up to 23 T. We demonstrate that the formation of short exchange springs (~ 2 nm) in the magnetically soft YFe$_2$ layers results in a giant magneto-resistance as high as 32% in the spr…
We have studied thermodynamics of the Mg-B system with the modeling technique CALPHAD using a computerized optimization procedure. Temperature-composition, pressure-composition, and pressure-temperature phase diagrams under different conditions are obtained. The results provide helpful insights into appropriate proces…
We present a mean-field theory of carrier-induced ferromagnetism in Mn$_x$III$_{1-x}$V diluted magnetic semiconductors with a special emphasis placed on the magnetic anisotropy. The valence band holes are described using the six band Kohn-Luttinger model. We find that the magnetic anisotropy is a complicated function…