Materials Literature
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A new gelcasting system based on aqueous‐based alumina‐poly(vinyl alcohol) (PVA) suspensions cross‐linked by an organotitanate coupling agent has been developed. The chemorheological properties of this system exhibited a strong compositional dependence. A sol‐gel phase diagram was established, which yielded the critic…
The natural orbitals and their corresponding occupation numbers are constructed for several interesting problems to demonstrate that the existence of negative natural orbital occupation numbers for single reference correlation methods provides a simple diagnostic for the need for a multiconfigurational description of…
The effect of polydispersity on the freezing transition of hard spheres is examined within a moment description. At low polydispersities a single fluid-to-crystal transition is recovered. With increasing polydispersity we find a density above which the crystal melts back into an amorphous phase. The range of densities…
The literature proposes some thermal models needed for the electrothermal simulation of power electronic systems. This paper gives a useful analysis about the choice of the thermal model circuit networks, equivalent to a discretization of the heat equation by the finite difference method (FDM) and the finite-element m…
Sintered submicrometer powder mixtures of strontium‐substituted lanthanum manganite and yttria‐stabilized zirconia have been studied in order to investigate the chemical stability of these materials as respectively electrode and electrolyte in solid oxide fuel cells. Formation of secondary phases was observed after 1…
Slow strain rate tests (SSRT) and fractographic examination of X-80 and X-52 pipeline steels showed transgranular stress corrosion cracking (TGSCC) could occur in a dilute aqueous solution with near-neutral pH. SCC intensity increased as the applied electrochemical potential and strain rates decreased. Hydrogen precha…
Polycrystalline Si 3 N 4 samples with different grain‐size distributions and a nearly constant volume content of grain‐boundary phase (6.3 vol%) were fabricated by hot‐pressing at 1800°C and subsequent HIP sintering at 2400°C. The HIP treatment of hot‐pressed Si 3 N 4 resulted in the formation of a large amount of ß‐S…
The sol−gel process from titanium alkoxide monomer to titanium oxide polymer was remarkably enhanced by salt catalysts containing basic anions and acidic cations. An ammonium carbonate catalyst promoted the precipitation of spherical titanium oxide particles at low concentrations of titanium alkoxide and water at room…
Optical thermometry based upon infrared excited upconversion fluorescence emission in Er/sup 3+/- and Er/sup 3+/-Yb/sup 3+/- doped Ga/sub 2/S/sub 3/-La/sub 2/O/sub 3/ chalcogenide glasses excited at 1.54 and 1.06 /spl mu/m, respectively, is presented. Temperature sensing in the region of 20/spl deg/C-220/spl deg/C wit…
This article proposes that, in binary blends of PEO with polymers bearing hydroxyl groups, only primary and not secondary hydroxyl groups form interchain hydrogen bonds with the skeletal ether oxygen of PEO. To prove this, PVA, propylated PVA, and two hydroxypropylated PVA derivatives one with only secondary OH groups…
A convenient synthesis of disodium S-[4-(4-ethoxybenzyl)-3,6,9-tris[(carboxy-kappaO)methyl]-3,6,9-triazaundecandioato)(5-)-kappa(3)N(3)(),N(6)(),N(9)(),kappa(2)O(1)(),O(11)()]gadolinate(2-) (Gd-EOB-DTPA), 1, is reported. This water-soluble complex is presently undergoing phase III clinical trials as a liver-specific c…
The oxidation of silanes to silanols, catalyzed by methyltrioxorhenium (MTO), proceeds in high conversions and excellent selectivities in favor of the silanol (no disiloxane product) when the urea/hydrogen peroxide adduct (UHP) is used as oxygen source instead of 85% aqueous H 2 O 2 . It is proposed that this novel Si…
We have investigated the swelling of a polystyrene brush in cyclohexane at varying temperatures with angle-dependent ellipsometry. The brush was grown in situ on the base of a high index prism by the “grafting from” technique. In the dry state it has a thickness of d = 134 nm. At the θ temperature it swells to about 6…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOrganoiron Route to a New Dendron for Fast Dendritic Syntheses Using Divergent and Convergent MethodsValérie Sartor, Laurent Djakovitch, Jean-Luc Fillaut, Françoise Moulines, Frédéric Neveu, Valérie Marvaud, Joëlle Guittard, Jean-Claude Blais, and Didier AstrucView Aut…
The lattice thermal conductivity of free standing wires is calculated within a Boltzmann equation approach. Diffusive and specular phonon scattering at the wire surfaces are included by appropriate boundary conditions on the phonon distribution. The wire thermal conductivity is found to decrease markedly below the bul…
Type II collagen is the main structural component of hyaline cartilages where it forms networks of thin fibrils that differ in morphology from the much thicker fibrils of type I collagen. We studied here in vitro the formation of fibrils of pepsin-treated recombinant human type II collagen produced in insect cells. Tw…
A Landau-Ginsburg-Devonshire-type thermodynamic theory is used to describe equilibrium single-domain states and phase transitions in epitaxial ferroelectric thin films. For BaTiO3 and PbTiO3 films grown on cubic substrates, the paraelectric to ferroelectric phase transition is found to be of the second order, irrespec…
The complex dielectric constant of a liquid crystal material, 4-cyano-4 ′ -alkyl-biphenyl (5CB), was measured in low-frequency regions below 1000 Hz. The anomalous increasing behavior was analyzed using an equivalent circuit which takes two kinds of contributions into account: one is from the electric double layer and…
First-row transition metal containing silicalite zeolites are important oxidation catalysts. Special attention has been devoted to develop new systems with an uniform pore size distribution which would allow large molecules to reach the active sites inside the structure. In the present paper, a series of vanadium-cont…
The equilibrium constants for endmember feldspar hydrolysis for the following reactions NaAlSi 3 O 8 8H 2 O Na Al(OH) 4 3H 4 SiO 4 0 KAlSi 3 O 8 8H 2 O K Al(OH) 4 3H 4 SiO 4 0 CaAl 2 Si 2 O 8 8H 2 O Ca 2 2Al(OH) 4 2H 4 SiO 4 0 are accurately described by log K low-albite 96.267305,542/T 2 3985.50/T28.588 10 6 T 2 35.7…