Materials Literature
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The charge disproportionation and the magnetic properties of Sr 3 Fe 2 O 7 , which has a double-layered perovskite structure, have been investigated. From 57 Fe Mössbauer measurements, the Néel temperature T N and the critical temperature for the charge disproportionation reaction (2 Fe 4+ → Fe 3+ + Fe 5+ ) are determ…
An increasing body of evidence suggests that an endogenous mammalian bufadienolide (BD) may be involved in the regulation of Na(+),K(+)-ATPase activity and the pathogenesis of arterial hypertension. We developed a purification scheme for marinobufagenin (MBG), an amphibian cardiotonic BD, and applied it to purify and…
A detailed investigation of the solution structure of two Yb(III) complexes of C 4 symmetric chiral tetraamide ligands based on cyclen is performed in different solvents with the combined use of 1 H NMR, NIR-CD, and luminescence techniques. Pseudocontact chemical shifts and NOE measurements allow one to assess the rel…
Abstract This study examined the effects of impact modifier types and addition levels on the mechanical properties of rigid PVC/wood‐fiber composites. The impact resistance of rigid PVC/wood‐fiber composites depends strongly on the type and content of impact modifier. With the proper choice of modifier type and concen…
Trains of juxtaposed drops in a tube are described and found to move spontaneously, in wetting conditions, because of their asymmetry. We focus on the coating properties of these devices, and show in particular that highly viscous species can be (self-) transported, thanks to the lubricating film left by the first dro…
Fluorinated amorphous-carbon films (a-C:F:H) were deposited by low-power rf capacitively coupled plasma-enhanced chemical-vapor deposition using CH4–CF4 gas mixtures. Different series of films were deposited, changing one parameter at a time: the CF4 partial pressure from 0% to 100%, the self-bias voltage from −50 to…
The dynamics of supercooled salol (phenyl salicylate) was measured in the time domain using optical Kerr effect techniques. By combining several experimental setups, data spanning more than six decades in amplitude and time (∼100 fs to ∼1 μs) were observed. The data have a complex shape, ranging from high-frequency in…
The investigation of two perovskite manganites with the same carrier concentration of 0.1 electron per Mn has been performed using neutron powder diffraction and electron microscopy, and completed with transport and magnetic measurements. For ${\mathrm{Sm}}_{0.1}{\mathrm{Ca}}_{0.9}{\mathrm{MnO}}_{3},$ whatever the tem…
A ligand with a linear arrangement of three coordination pockets produces a Cu9O12, alkoxide-bridged, square grid of closely spaced copper centers (see picture) in high yield by a strict self-assembly process. Orthogonal bridging connections within the grid lead to dominant intramolecular ferromagnetic coupling with a…
The single-crystal X-ray structures of three odd-membered thiophene oligomers bearing one central thienyl- S, S -dioxide moiety trimer, pentamer, and heptamer are reported. Absolute photoluminescence quantum yields in microcrystalline powders are given for all compounds. The solid-state photoluminescence efficiencies…
The crystallographic and magnetic properties of the $\mathrm{Mn}[\mathrm{N}(\mathrm{CN}{)}_{2}{]}_{2}$ compound have been investigated by dc magnetization, ac susceptibility, specific heat, and zero-field neutron diffraction on polycrystalline samples. The magnetic structure consists of two sublattices which are antif…
The conversion efficiencies of organic photovoltaic devices have been improved by a factor of 4–5 by introducing a large surface-area interface between the donor and acceptor layers. Stratified films of a fullerene-based acceptor (see Figure) were spin-coated on top of a donor (MDMO-PPV), forming a diffuse interface w…
In the ring $\mathbf{Z}[\frac{1+\sqrt{5}}{2}]$, there is a natural subdivision technique analogous to regular subdivision in rational algebraic rings like $\mathbf{Z}[\frac{1}{2}]$. The properties of this subdivision process are developed using the matrix associated to the Fibonacci substitution tiling. These properti…
A rare case of ternary polymer miscibility has been demonstrated in the mixture (in the glassy amorphous domains) comprising three polymers: polyetherimide (PEI), a new semicrystalline meta-linked poly(ether diphenyl ether ketone) (PEDEKm), and semicrystalline poly(ether ether ketone) (PEEK). The Tg-composition relati…
Nanostructured materials have many forms. One that has been somewhat neglected until recently is organogels, especially those whose three-dimensional structural networks are based on the self-assembly of low molecular-mass organic gelators (LMOGs). These thermoreversible materials consist of a small amount of LMOG and…
In this article, we report results of an extensive characterization study involving scanning electron microscopy, spectroscopic ellipsometry (SE), photothermal deflection spectroscopy (PDS), x-ray photoelectron spectroscopy, x-ray Auger electron spectroscopy (XAES), current–voltage (I–V) measurements, hydrogen content…
Abstract The surface characteristics of carbon—silica dual phase filler (CSDPF) were investigated by inverse gas chromatography (IGC) at infinite dilution. It was found that due to its unique surface microstructure, the dispersive component of the surface energy γ s d of CSDPF is considerably higher than those of carb…
A paper describing several micas, which have been used in the insulation systems of high power rotating machines for many years.
The vibrational and structural characteristics of a CO3-rich apatite from an extrusive carbonatite in Kasekere, Uganda, were studied by infrared and Raman spectroscopy, single-crystal X-ray diffraction and electron microprobe analysis. Electron microprobe analysis provided, based on Σ(large cations) = 10, a cation con…
The HRP-catalyzed oligomerization of cinnamoyl-hydroquinone-ester and cinnamoyl-4-hydroxyanilide led to the formation of soluble polyphenols. The oligomers were synthesized in water/1,4-dioxane and in water/acetone mixtures and characterized by NMR, FTIR and SEC. Upon UV-treatment of the homogenous films the polypheno…