Materials Literature
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The association of acceptor cations (Fe′Ti and Mn″Ti) with oxygen vacancies in Fe- and Mn-doped SrTiO3 single crystals is investigated using in-situ EPR spectroscopy. Effective association enthalpies ΔassH0eff and entropies ΔassS0eff are determined, and ΔassH0eff is found to depend strongly on the dopant concentration…
A one-pot procedure that allows the preparation of 5,10,15-triarylcorroles directly from the condensation of pyrrole and benzaldehydes, avoiding the concomitant formation of the corresponding tetraarylporphyrins, has been developed. This approach is general and allows the preparation of sterically hindered corroles fr…
Redox-related changes in biological properties of copper bis(thiosemicarbazone) radiopharmaceuticals are induced by backbone alkylation. To determine whether these changes are mediated by changes in core structural parameters, eight X-ray structures of variously alkylated complexes were determined. The complexes inclu…
A novel heterospin system, [(CuL)Gd(H2O)3(Fe(CN)6)] x 4H2O, is obtained by reacting the mononuclear complex, [CuL], with gadolinium(III) nitrate, followed by the substitution of the nitrato groups with [Fe(CN)6](3-) ions (L2- = N,N'-propylenedi(3-methoxysalicylideneiminato)).
Multiple-step martensitic transformations in Ni-rich NiTi shape memory alloys have so far been rationalized on the basis of dislocation stress fields, coherency stress fields around Ni 4 Ti 3 precipitates and evolving Ni concentrations between precipitates during ageing. The primary objective of the present paper is t…
Mg–3%Al–1%Zn (AZ31) alloy was subjected to ECAE (Equal Channel Angular Extrusion) processing under various processing conditions. Then tensile tests were carried out at room temperature to investigate the relationship between tensile properties and microstructural parameters that include grain size and the texture gen…
Hall-effect, photoluminescence (PL), and electron paramagnetic resonance (EPR) measurements have been performed in single-crystal ZnO samples annealed in air at 25, 550, 750, and 950 °C, for 30 min each. A 37 meV donor is dominant in the unannealed sample, but nearly disappears during the higher temperature anneals, a…
In this study, 3 types of plasma techniques, i.e. plasma modification, plasma deposition and plasma followed by grafting reaction, are used for the fabrication of tools, medical devices and biomaterials. Depending on purpose, bioadhesion of cells and biomolecules is either looked for or avoided. Since the mechanisms o…
Establishment or maintenance of a persistent infection by Mycobacterium tuberculosis requires the glyoxylate pathway. This is a bypass of the tricarboxylic acid cycle in which isocitrate lyase and malate synthase (GlcB) catalyze the net incorporation of carbon during growth of microorganisms on acetate or fatty acids…
Large-sized, crack-free silica monoliths with highly ordered mesostructure are prepared by a fast and easy way via liquid-paraffin-medium protected solvent evaporation. By employing the inert liquid paraffin as the morphology “protector”, cracks of the materials can be successfully avoided and the processing time can…
The experimental investigation of the rate-controlled synthesis and sintering of barium titanate by different methods have been carried out. It is shown that the permittivity of barium titanate depends on effective grain boundaries width, which consists of physical grain boundary and depolarization field area. The eff…
The first series of monodisperse glass-forming, nematic oligofluorenes was synthesized following a divergent−convergent approach. Both chain length and pendant structure were found to affect solid morphology and phase transition temperatures. With optimized structural parameters, a T g close to 150 °C and a T c beyond…
Liposomes were first described nearly 40 years ago and have been useful models for studying the physical chemistry of lipid bilayers and the biology of the cell membrane (rev. in 1–3). More than 30...
We applied a new multi-step protocol to predict the structures of all targets during CASP5, regardless of their potential category. 1) We used diverse fold-recognition (FR) methods to generate initial target-template alignments, which were converted into preliminary full-atom models by comparative modeling. All prelim…
The thermal stability of 1 M solutions in mixtures of ethylene carbonate, diethyl carbonate, and dimethyl carbonate in the temperature range of 40 to 350°C was studied by accelerating rate calorimeters (ARC) and differential scanning calorimeters (DSC). Nuclear magnetic resonance (NMR) was used to analyze the condense…
Stereocontrol of the stereogenic centers in the main chain during the synthesis of polyketones, polyesters, and polycarbonates has been reviewed. The examples described may be classified in the following ways. Retention of the configuration which exists in the monomer: as described in the ring opening polymerization o…
The transformation process of various cobalt hydroxide and hydroxide nitrate into final free-standing Co 3 O 4 nanocubes with a uniform size of ca. 47 nm has been investigated with X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (T…
Reaction of [Fe(III)(bipy)(CN)4]- with fully solvated M(II) cations [M = Co (1) and Mn (2)] produces the isostructural bis double zigzag chains [[Fe(III)(bipy)(CN)4]2M(II)(H2O)] x MeCN x (1/2)H2O; 1 exhibits intrachain ferromagnetic and interchain antiferromagnetic couplings, slow magnetic relaxation and hysteresis ef…
A new method has been developed to study the role of hydrogen bonding in ice adhesion and to minimize the effect of this mechanism on ice adhesion. Metals were coated with a mono-molecular layer that had either strong hydrophobic properties or strong hydrophilic properties. Self-assembling monolayers (SAMs) of varying…
This paper presents the preparation of unique copper sulfide flakes in CTAB/n-C5H11OH/n-C6H14/water microemulsions under hydrothermal conditions at 130 °C. With the pre-addition of n-dodecanethiol to the microemulsions, much smaller hexagonal Cu2S nanodisks resulted, which self-assembled into a superlattice. The cryst…