Materials Literature
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Abstract (CuI) 2 Cu 3 SbS 3 was prepared by solid‐state reaction of stoichiometric amounts of CuI, Cu, S, and Sb. The crystal structure was determined from single crystals at room temperature and ‐ 80°C. Red‐orange (CuI) 2 Cu 3 SbS 3 crystallizes in the orthorhombic system, space group Pnnm (no. 58) with a = 10.488(2)…
Online studies of structure and morphology development during continuous drawing of a nylon 66 fiber at different temperatures were carried out using synchrotron wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS) techniques. From the two-dimensional (2D) WAXD measurement, unit-cell parameters…
The evolution of tidally truncated globular clusters is investigated by integrating a two-dimensional Fokker-Planck equation that allows the development of velocity anisotropy. We start from the isotropic Plummer model with tidal cut-off and follow the evolution through the core collapse. The heating by a three-body b…
The reaction of Pd with a molten mixture of A(2)Q(x)()/P(2)Q(5)/Q (A = K, Q = S, x = 3; A = Cs, Q = Se, x = 1) produced the molecular compounds K(4)Pd(PS(4))(2) (I), Cs(4)Pd(PSe(4))(2) (II), and Cs(10)Pd(PSe(4))(4) (III) and the solid-state KPdPS(4) (IV), K(2)PdP(2)S(6) (V), and Cs(2)PdP(2)Se(6) (VI). Compounds I-III…
Physico-chemical cell surface properties of 23 coagulase-negative staphylococcal strains, including contact angles, zeta potentials and elemental cell surface composition were measured, together with the adhesion of all strains to hexadecane. The data were employed in a hierarchical cluster analysis, revealing that th…
The synthesis and characterization of the following heterosapphyrins is presented: 3,7,18,22-tetraethyl-2,8,12,13,17,23-hexamethyl-27-oxasapphyrin ( 5 ), 3,8,12,13,17,22-hexaethyl-2,7,18,23-tetramethyl-15,29-dioxasapphyrin ( 6 ), and 3,7,18,22-tetraethyl-2,8,12,13,17,23-hexamethyl-15,27,29-trioxasapphyrin ( 7 ). These…
Novel model block copolymers of ( R,S )-β-butyrolactone with pivalolactone (PVL) are prepared in order to define the effect of crystalline domains provided by poly(pivalolactone) on the biodegradability of atactic poly(β-butyrolactone), a-PHB. The “living” a-PHB is synthesized from racemic β-butyrolactone, in the pres…
X-ray powder diffraction is one of the most sensitive methods for the analysis of crystalline forms of silica. In addition to detection and quantification, it can determine the specific crystalline species in the sample. The principal limitations of the method depend on the effective volume of the sample in the X-ray…
Abstract The substructure of natural clinotobermorite Ca 5 [Si 3 O 8 (OH)] 2 · 4 H 2 O \p=n-\ Ca 5 [Si 6 O l7 ] · 5 H 2 O from the Wessels mine, Kalahari manganese field, South Africa, was determined from single-crystal X-ray data. The diffraction pattern (monoclinic: a = 11.19 Å, b = 7.29 Å, c = 22.46 Å, β = 96.97°)…
The transition between the merocyanine and spiropyran forms switches the selectivity of the bis(spiropyran) azacrown ether 1 from La3+ to K+ [Eq. (1)]. Thus, 1 offers much greater possibilities for selectivity control between multi- and monovalent metal ions than the corresponding unsubstituted azacrown ether.
Abstract Hyperbranched polymethacrylates were synthesized by group transfer self-condensation polymerization of 2-(2-methyl-1-triethylsiloxy-1-propenyloxy)ethyl methacrylate. The hyper-branched structure of the polymer was characterized by 13C NMR spectroscopy. The extent of the branching depended on the nucleophilic…
Infrared (IR) spectra were measured for three 4‘- n -alkoxy-3‘-nitrobiphenyl-4-carboxylic acid homologues [ANBC- n, where the carbon number of the alkoxy group ( n ) is 14, 16, and 22] as a function of temperature. The phase sequences for ANBC-14, -16, and -22 are crystal (C)−smectic C (S C )−smectic A (S A )−“structu…
We have studied the origin of field emission from wide band-gap semiconductors by a combination of voltage dependent field-emission energy distribution and I–V measurements. For this purpose, tip-shaped molybdenum emitters were coated with 100–1000 nm thick layers of nominally undoped diamond and cubic boron nitride (…
A resistor network model is developed for solid oxide fuel cell (SOFC) composite anodes, in which solid electrolyte grains, metal particles, and pores are considered on the same footing. The model is studied by a Monte Carlo simulation on a face‐centered cubic lattice, with a random distribution of the three component…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPhoto-optical Control with Large Refractive Index Changes by Photodimerization of Poly(vinyl cinnamate) FilmSeiichiro Murase, Koichi Kinoshita, Kazuyuki Horie, and Shin'ya MorinoView Author Information Department of Chemistry and Bi…
Plastic deformation experiments have been performed on Czochralski-grown decagonal Al-Ni-Co single-quasicrystals at temperatures between 780 and 860°C. Compression tests at a strain rate of 10-5s-1 with different orientations of the compression axis relative to the tenfold quasicrystal direction show an anisotropy of…
The adsorption of S 2 on ZnO and Cu/ZnO has been investigated using synchrotron-based high-resolution photoemission spectroscopy. On dosing a clean ZnO surface with S 2 at 300 K, the molecule dissociates. The S is associated first with Zn and at medium coverages with Zn−O sites. When the sulfur coverage is increased t…
Resistance degradation in lead zirconate titanate (Pb(Zr,Ti)O 3 , PZT) thin‐film capacitors has been studied as a function of applied voltage, temperature, and film composition. The mean time‐to‐failure (lifetime, or t f ) of the capacitors shows a power‐law dependence on voltage of the form t f ∝ V −n ( n similar/con…
Two novel bis-terdentate Ir(III)-cyclometalated complexes, [Ir(L1)(L1(-))](2+) (1) and [Ir(L1(-))(2)](+) (2), have been prepared (L1 is 2,6-bis(7'-methyl-4'-phenyl-2'-quinolyl)pyridine; L1(-) is its mono-anion, see Figure 1). To the best of our knowledge, 1 and 2 are the first luminescent and redox-active Ir(III)-cycl…
Monte Carlo simulations, using the cooperative motion algorithm (CMA), have been employed to investigate the statics and dynamics of both symmetric and asymmetric diblock copolymer melts near the order−disorder transition. Investigation of the static properties has revealed the existence of two characteristic temperat…