Materials Literature
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This article addresses the most recent developments in the processing of high-performance magnets based on rare earth-transition metal (R-T) compounds. It gives an overview of the relevant classes of R-T compounds together with a description of the appropriate manufacturing route and an assessment of their potential f…
We report the cloud point, glass transition temperature T g, and dielectric relaxation for blends composed of poly( n -butyl acrylate)s (PBA) and a linear poly(propylene glycol) (PPGD) and for blends of PBA and a star-shaped PPG having three arms (PPGT). The phase diagram is of the upper critical solution type (UCST),…
GaAs(110) surfaces have been studied after etching in Br 2 /H 2 O solutions and emersion from the electrolyte using high-resolution synchrotron-induced photoelectron spectroscopy. High-quality spectra of the core lines and the valence band region have been obtained by using a specifically developed transfer procedure,…
Oxidative polymerization of 2,6-difluorophenol was performed using the Fe−salen complex and hydrogen peroxide as catalyst and oxidizing agent, respectively. The resulting polymer obtained at 60 °C in 1,4-dioxane was partly soluble in tetrahydrofuran and insoluble in chloroform, benzene, and hexafluorobenzene. The mole…
Dinuclear complexes with M-CN-ZnPc and M-CN-FePc-CN arrays and trinuclear complexes with M(mu-CN)Fe(mu-CN)M' arrays containing central metal phthalocyaninato (Pc) and external Cp(dppe)Fe or Cp(PPh3)2Ru building blocks (M) and having all possible orientations of the bridging cyanide ligands were subjected to electroche…
To reveal the metal oxide−support interactions in ZrO 2 -supported Fe oxide catalysts as a function of calcination temperature, 5 wt % Fe/ZrO 2 was characterized by means of 57 Fe Mössbauer spectroscopy, IR, XRD, and thermogravimetric analysis. The catalytic activity of Fe/ZrO 2 was examined at 523 K for NO−CO reactio…
The syntheses and X-ray structures of the di- and trinuclear pivalates [C9H7NH][CoTb(Piv)3(C9H7N)(NO3)3]·0.5H2O, [CoLn(Piv)5(C9H7N)(H2O)]·0.5C9H7N (Ln = Gd, Dy), and [Co2Gd(Piv)6(C9H7N)2(NO3)] (Piv = O2CCMe3) are reported. The four complexes all exhibit weak ferromagnetic interactions between their corresponding heter…
The generic heterogeneous effect of foreign particles on 3D nucleation was examined in terms of the relative size and the interfacial interaction and structural match with the crystallizing phase in terms of a so-called interfacial correlation function f ( m, x ). At low supersaturation, nucleation is controlled by fo…
This investigation presents a novel method of preparation of barium strontium titanate (BST) from [Ba(2,4-pentadionate)-Sr(2,4-pentadionate)-Ti(OC 3 H 7 ) 4 -TEA-i-PrOH-water] system. Triethanolamine (TEA) was used as an additive, which prevents the precipitation of oxides from the alcoholic titanium isopropoxide solu…
This study was focused on coalescence in highly concentrated emulsions stabilized by a whey protein isolate or by sodium dodecyl sulfate. For both stabilizers, coalescence of the emulsion at rest occurred below a critical concentration of the stabilizer. This concentration was related to full coverage of the droplet i…
The combination of bioresorbable and biodegradable hydrophilic polysaccharides with biodegradable hydrophobic polyester chains to form totally biodegradable, nonionic brushlike amphiphilic graft copolymers useful as surfactants has been investigated. In fact, a totally controlled and original three-step procedure is d…
Thin organic films were deposited from plasmas of allyl alcohol, acrylic acid, allylamine, and octa-1,7-diene onto aluminum substrates. These plasma polymerized films were analyzed by X-ray photoelectron spectroscopy (XPS) before and after prolonged periods of storage under laboratory atmosphere to attempt to quantify…
Solution cast films were prepared from poly(L-lactide) (PLLA) and poly(epsilon-caprolactone) (PCL) as well as from three blends, namely B75, B50, and B25 with PLLA/PCL proportions of 75/25, 50/50, and 25/75, respectively. The enzymatic degradation of square samples (10 x 10 x 0.2 mm) cut from the films was investigate…
A novel hydrophilic macromer adapted for chemical grafting has been synthesized. It consists of methyl-end-capped poly(ethylene glycol) functionalized with a urethane terminus. Dispersion polymerization of styrene in an alcohol/water medium in the presence of the macromer allows chemical grafting of the macromer to th…
The molecular building blocks Fe(II)Pc (Pc = phthalocyaninato2-), Fe(III)Pc, ZnPc, Cp(dppe)Fe, and Cp(PPh3)2Ru were combined in the cyanide-bridged dinuclear reference compounds with M-CN-ZnPc and M-CN-FePc-CN arrays containing Fe(II)Pc and Fe(III)Pc. The linear trinuclear species with the M(mu-CN)Fe(mu-CN)M' backbone…
Narrow band gaps and high electron affinities are associated with the new oligomers containing thiophene-1-oxide and thiophene-dioxide that have been prepared by zirconocene coupling methods. A series of oligomers with 3–11 rings (X=2 H, S, and S(=O)2; see picture) allow the electronic properties of conjugated chains…
Two kinds of solventless liquid oligoesters, linear and three-armed, were synthesized by direct esterification of a mixture of diacids and diol or triol. The molecular weights of such oligoesters are in the range 800−1000. Linear oligoesters have a single melting point of between −5 and 0 °C while only one glass trans…
Stepwise assembly of isotactic poly(methyl methacrylate) and syndiotactic poly(methacrylic acid) from acetonitrile and mixed acetonitrile/water solutions, respectively, onto a gold substrate was studied. Quantitative quartz crystal microbalance analysis of the molar ratio (monomer unit) between assembled polymers sugg…
The crystal structures of gyceraldehyde 3-phosphate dehydrogenase (GAPDH) from Escherichia coli have been determined in three different enzymatic states, NAD(+)-free, NAD(+)-bound, and hemiacetal intermediate. The NAD(+)-free structure reported here has been determined from monoclinic and tetragonal crystal forms. The…
We use variational quantum Monte Carlo to calculate the density-functional exchange-correlation hole n_{xc}, the exchange-correlation energy density e_{xc}, and the total exchange-correlation energy E_{xc}, of several electron gas systems in which strong density inhomogeneities are induced by a cosine-wave potential.…