Materials Literature
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Trivalent europium or erbium doped yttria samples obtained by a wet chemical synthesis procedure have been investigated by wide and small angle X-ray scattering, scanning and transmission electron microscopy and luminescence spectroscopy. On the micron scale the powders obtained are large, compact aggregates built up…
Photoluminescent organic–inorganic composite films incorporating the rare-earth-containing polyoxometalate Na9[EuW10O36] (EW) and poly(allylamine hydrochloride) (PAH) have been prepared by the layer-by-layer self-assembly method. UV-vis spectroscopy and ellipsometry were used to follow the fabrication process of the E…
Abstract The structure of nylon‐6 hybrids with synthetic or natural clays was investigated for melt‐pressed films with Fourier transform infrared spectroscopy, wide‐angle X‐ray diffraction, and differential scanning calorimetry in comparison with the nylon‐6 homopolymer. In contrast to the development of familiar α‐fo…
We report the use of X-ray photoelectron spectroscopy (XPS) to characterize the surface compositions of colloidal nanocomposite particles. Each nanocomposite was synthesized by (co)polymerizing 4-vinylpyridine in the presence of an ultrafine silica sol. Thus, nitrogen and silicon were utilized as unique elemental mark…
Novel cluster Ru chalcogenide materials Mo x Ru y Se z and Ru x Te y were studied in situ using EXAFS in the transmission mode during the oxygen reduction reaction. Reversible changes in the structure of the active center were revealed for the electrochemical reaction as a function of the applied electrode potential.…
Functionalization of γ-[SiW10O36]8− with the sulfanylalkylsilane HSC3H6Si(OMe)3 affords difunctionalized γ-[SiW10O36(HSC6H3Si)2O]4−, which on addition to colloidal solutions of gold nanoparticles (4–12 nm) forms a novel hybrid nanosystem (see schematic diagram).
We describe the synthesis of novel copolymers containing quinoline, benzene, and alkyne groups by a Pd-catalyzed Heck−Cassar−Sonogashira−Hagihara reaction. Direct iodination of quinoline by a mixture of iodine, potassium periodate, and sulfuric acid in chloroform gives 3,6-diiodoquinoline. 3,6-Diiodoquinoline was coup…
Big blue-walled tires: A diamagnetic blue 28-electron reduced species [MoMoO432H28(H2 O)58]12− ({Mo142}) was produced photochemically by the degradative self-assembly of [Mo36O112(H2O)16]8− ({Mo36}). The molybdenum blue photochemistry is not only suitable for the investigation of the mechanism of degradation self-asse…
Size-tunable CdS nanorods have been synthesized via the reaction at low temperature (25−65 °C) of air-insensitive inorganic precursors cadmium acetate and sodium sulfide in an aqueous phase with surfactant. Nonionic pluronic amphiphilic triblock copolymers, (EO) x (PO) y (EO) x, were employed as structure-directing ag…
Differential scanning calorimetry (DSC), atomic force microscopy (AFM), wide-angle X-ray scattering (WAXD), and solid-state (13)C NMR have been used to investigate the crystalline/amorphous structure and molecular mobility of biodegradable poly(butylene adipate-co-44 mol % butylene terephthalate) [P(BA-co-44 mol % BT)…
Two novel tetradecanuclear hydroxo-lanthanide complexes, formulated as Ln14(mu 4-OH)2(mu 3-OH)16(mu-eta 2-acac)8(eta 2-acac)16, Ln = Tb, 1; Eu, 2; acac = acetylacetonato, were synthesized and characterized by single-crystal X-ray diffraction, elemental analysis and phosphorescence spectroscopy.
A series of polyvinyl alcohol (PVA)–selenide nanocomposites, including PVA–Ag2Se, PVA–Cu2 − xSe, PVA–ZnSe and PVA–PbSe, were successfully prepared at room temperature and ambient pressure via a simple one-step solution growth technique. X-Ray diffraction (XRD), transmission electron microscopy (TEM) and infrared spect…
Here we report a coordination polymer based, stable organogel (termed 'metallogel' to emphasize the essential role of metal-ligand bonding during the gelation), which 'uptakes' neutral organic molecules from the aqueous phase.
We have determined the crystal structure of the enzyme enoyl-CoA hydratase (ECH) from rat liver with the bound substrate 4-(N,N-dimethylamino)cinnamoyl-CoA using X-ray diffraction data to a resolution of 2.3 A. In addition to the thiolester substrate, the catalytic water, which is added in the hydration reaction, has…
Solid-state cross-linking of elastin−mimetic fibers was investigated. Through available lysine residues, an elastin−mimetic protein polymer, poly((Val-Pro-Gly-Val-Gly) 4 (Val-Pro-Gly-Lys-Gly)) 39, was modified to incorporate an acrylate moiety. The degree of acrylate functionalization could be varied by changing the r…
We present first-principles calculations on electron transport through Na nanowires at finite bias voltages. The nanowire exhibits a nonlinear current-voltage characteristic and negative differential conductance. The latter is explained by the drastic suppression of the transmission peaks which is attributed to the el…
Poly(L-lactide) (PLLA) thin film with 100 nm thickness was crystallized at 160 degreesC for 20 min from the melt obtained at 220 degreesC. Hexagonal crystals with three types of growth (derivative growth lamellae, overgrowth multistacked lamellae, and undergrowth multistacked lamellae) were simultaneously observed by…
The incorporation of the rare-earth complex [C 5 H 5 NC 16 H 33 ][Eu(TTA) 4 ] into surface-modified mesoporous molecular sieve Si−MCM-41 via reactions of the surface Si−OH with different silylation agents such as (C 2 H 5 O) 3 Si(CH 2 ) 2 NH(CH 2 ) 2 NH 2 (NSED), (C 2 H 5 O) 3 Si(CH 2 ) 3 NH 2 (APTES), and (C 2 H 5 O)…
A direct pyrolysis method from artificial lamellar mesostructures to nanotubes was developed for the synthesis of tungsten disulfide (WS(2)) nanotubes. In this process, a tungsten sulfide artificial lamellar mesostructure composite with intercalated cetyltrimethylammonium cations (WS-L) was prepared on the basis of th…
Polymer composites based on organically modified phyllosilicates (organoclay) and poly(ethylene- co -vinyl acetate) (EVA) were prepared by melt processing to study their combustion behavior. Their degrees of dispersion and intercalation spacings as determined by transmission electron microscopy (TEM) and X-ray diffrac…