Solid Oxide Fuel Cell Cathodes: Polarization Mechanisms and Modeling of the Electrochemical Performance
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Bent and Linear Forms of the (μ‐Oxo)bis[trichloroferrate(III)] Dianion: An Intermolecular Effect − Structural, Electronic and Magnetic Properties
Abstract We have analyzed the great diversity of Fe−O−Fe angles, 140−180°, found in the X‐ray structures of the (μ‐oxo)bis[trichloroferrate( III )] dianion [Cl 3 FeOFeCl 3 ] 2− from both experimental and theoretical points of view. Theoretical calculations show that only the linear isomer is found as a minimum on the…
Effect of talc and bauxite on sintering, microstructure, and refractory properties of Egyptian dolomitic magnesite
AbstractRefractories produced from mixes of Egyptian dolomitic magnesite with talc and low cost Chinese bauxite have been assessed as potential substitutes for the high temperature basic refractory bricks currently used in steelmaking and other industries. Fifteen batches of different compositions were prepared by fir…
Synthesis, Crystal Structure, Thermal Analysis and Magnetic Behavior of a Novel One‐Dimensional Polymeric Pyridinium Chlorocuprate(II): (Hpy)2[Cu3Cl8(H2O)2]
Abstract A one‐dimensional polymeric pyridinium chlorocuprate (HPy) 2 [Cu 3 Cl 8 (H 2 O) 2 ], an intermediate between (HPy)CuCl 3 and CuCl 2 ·2H 2 O, has been synthesized and characterized by X‐ray analysis [monoclinic, P 2 1 / c , a = 7.8950(10), b = 14.144(2), c = 9.921(10) Å, β = 99.20(2)°]. The structure contains…
Muon Spin Rotation and Mössbauer Investigations of the Spin Transition in [Fe(ptz)6](ClO4)2
The compound [Fe(ptz) 6 ](ClO 4 ) 2 (ptz = 1-propyl-tetrazole) displays a gradual thermal spin crossover with magnetic susceptibility measurements (∼4.2−300 K) showing that the transition is centered around T 1/2 ∼ 150 K and extends from ∼90−190 K. Evidence of the scope to track a thermally induced spin transition usi…
Pressure Effects on the Segmental Dynamics of Hydrogen-Bonded Polymer Blends
Segmental relaxations in the neat components and the blend of poly(4-vinylphenol) (PVPh) with poly(ethylene- co -vinyl acetate) (EVA, with 70 wt % vinyl acetate) are studied by broadband dielectric spectroscopy at different temperatures and hydrostatic pressures (up to 750 MPa). Pressure retards the relaxation, with a…
Synthesis and Characterization of Novel Thermoplastic Polyester Containing Blocks of Poly[(R)-3-hydroxyoctanoate] and Poly[(R)-3-hydroxybutyrate]
Novel block copolyester containing biocompatible and biodegradable biopolyester blocks was prepared by polycondensation of telechelic hydroxylated poly[( R )-3-hydroxyoctanoate] (PHO-diol) and telechelic hydroxylated poly[( R )-3-hydroxybutyrate] (PHB-diol) with terephthaloyl chloride (TeCl). Reaction of PHO-diol ( M…
Critical Role of Lys212 and Tyr140 in Porcine NADP-dependent Isocitrate Dehydrogenase
Lys212 and Tyr140 are close to the enzyme-bound isocitrate in the recently determined crystal structure of porcine NADP-specific isocitrate dehydrogenase (Ceccarelli, C., Grodsky, N. B., Ariyaratne, N., Colman, R. F., and Bahnson, B. J. (2002) J. Biol. Chem. 277, 43454-43462). We have constructed mutant enzymes in whi…
Wall structure and surface chemistry of hydrothermal carbon nanofibres
A transmission electron microscopy examination of hydrothermally produced carbon nanofibres/nanotubes with outer diameter 50–200 nm suggests that the tube walls are inclined with respect to the tube axis. The apex angles are in the range 8°–16°. The structure of these tubes and their growth mechanism can be described…
Synthesis and Characterization of a New Degradable Poly(ester amide) Derived from 6-Amino-1-hexanol and Glutaric Acid
An alternating poly(ester amide) constituted by 6-amino-1-hexanol and glutaric units has been synthesized by different ways involving solution or thermal polycondensation. Results of the synthesis are compared, and the occurrence of a thermal degradation through imide ring formation is demonstrated. Hydrolytic and enz…
Nanosized Sodium-Doped Lanthanum Manganites: Role of the Synthetic Route on Their Physical Properties
In this paper we present the results of the synthesis and characterization of nanocrystalline La 1 - x Na x MnO 3+ δ samples. Two synthetic routes were employed: polyacrylamide-based sol−gel and propellant synthesis. Pure, single-phase materials were obtained with grain size around 35 nm for the sol−gel samples and ar…
Diameter Enlargement of Single-Wall Carbon Nanotubes by Oxidation
The diameter of high-pressure CO (HiPco) single-wall carbon nanotubes (SWNTs) has been enlarged by treating them with nitric acid and oxygen, and the diameter enlargement is related to the nitric acid refluxing time. Raman spectra (exciting wavelength 488 nm) and transmission electron microscopy showed that the 0.8−1.…
Clay Mineralogy of Mudstones from the Nankai Trough Reference Sites 1173 and 1177 and Frontal Accretionary Prism Site 1174
X-ray diffraction analyses of the clay-sized fraction of sediments from the Nankai Trough and Shikoku Basin (Sites 1173, 1174, and 1177 of the Ocean Drilling Program) reveal spatial and temporal trends in clay minerals and diagenesis. More detrital smectite was transported into the Shikoku Basin during the early–middl…
What Length Scales Control the Dynamics of Miscible Polymer Blends?
The segmental dynamics of miscible polymer blends have been the focus of much recent research since the two constituents typically appear to experience different average dynamic environments. It has been suggested that these results can be attributed to concentration fluctuations coupled to chain connectivity effects.…
X‐ray Crystal Structure of a Sodium Salt of [Gd(DOTP)]5−: Implications for Its Second‐Sphere Relaxivity and the 23Na NMR Hyperfine Shift Effects of [Tm(DOTP)]5−
Abstract The X‐ray structure of the sodium salt of [Gd(DOTP)] 5− shows two different chelates, [Gd (1) (DOTP)] 5− and [Gd (2) (DOTP)] 5− , bound at either surface of a sheet formed by a cluster of hydrated Na + ions. Each [Gd (1) (DOTP)] 5− anion binds directly to four Na + ions of this cluster through the free oxygen…
Consequences of Molecular Bridging in Lamellae-Forming Triblock/Pentablock Copolymer Blends
This study demonstrates that bridging (and possibly knotted looping) pentablock configurations in CEC/CECEC (triblock/pentablock) blends play significant roles in the shear-induced alignment and tensile mechanical properties of lamellae-forming block copolymers. Adding just 15 wt % pentablock to the triblock copolymer…
Polyelectrolyte Multilayers of Weak Polyacid and Cationic Copolymer: Competition of Hydrogen-Bonding and Electrostatic Interactions
We report on the competitive role of hydrogen bonding and electrostatic interactions in growth and stability of polyelectrolyte multilayers (PEMs) in a wide range of pH. The system was a cationic copolymer of acrylamide and dimethyldiallylammonium chloride (PAAm-DMDAAC) containing 50% cationic units and poly(methacryl…
Water Absorption Effect on the Dynamic Properties of Nylon-6 by Dielectric Spectroscopy
New results of dielectric spectroscopy in semicrystalline nylon-6 samples with different moisture contents are presented by using a wide frequency (10 -2 −3 × 10 6 Hz) and temperature range (133−433 K). The dielectric absorption spectra in frequency domain are decomposed in Cole−Cole distributions corresponding to the…
Micro/nanomechanical characterization of a natural nanocomposite material—the shell of Pectinidae
The study computes evolutionary tracks for 13-16 mass values (depending on the assumed chemical composition) in the range 0.15-1.25 solar mass for each of 10 metallicities between -2.26 and -0.47 (Fe/H). A total of 46 tracks are evolved to the helium flash point. The properties of selected models along the entire evol…
When Does a Molecule Become a Polymer?
Using light scattering spectroscopy, we demonstrate that a transition from small molecular behavior to Rouse dynamics in poly(dimethylsiloxane) (PDMS) is a smooth function of molecular weight, M w . The asymptotic Rouse behavior is achieved when the chain begins to display Gaussian behavior. Surprisingly, the molecula…