Materials Literature
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The current provisions for determination of the upward temperature shift of the lower-bound static fracture toughness curve due to irradiation of reactor pressure vessel steels are based on the assumption that they are the same as the Charpy 41-J shifts as a consequence of irradiation. The objective of this paper is t…
Urea-functionalized dendrimers are prepared which show very efficient phase transfer, in particular of the diagnostically relevant anions pertechnetate, perrhenate and ATP; the extractability rates are evaluated quantitatively by tracer methods; their pH dependancy allows controlled release of guest molecules from the…
The synthesis, characterisation (XRD, DTA, IR, UV-Vis) and magnetic properties of the layered compound Co 5 (OH) 8 (O 2 CC 4 H 8 CO 2 )·5H 2 O are reported. It is characterised by a triangular magnetic lattice with a metal–metal distance of 3.1 Å and an interlayer distance of 14.3 Å. The layers are bridged through the…
The synthesis and characterization of a series of p-phenyleneethynylene oligomers that contain the 2,2′-bipyridine-5,5′-diyl moiety is reported; metallation of the oligomers with ReI(CO)5Cl and Ru(bpy)2Cl2 yields the corresponding (L)Re(CO)3Cl and (L)Ru(bpy)22+ complexes.
The reaction between yttrium nitrate pentahydrate and the sodium salt of allyl acetatoacetate afforded nonanuclear cluster anions [Y9(µ4-O)2(µ3-OH)8{MeC(O)CHC(O)Z}16]–, the functional group Z being the initial allyl one OCH2CHCH2 or an ethoxide depending on the experimental conditions.
The non-crystallographic symmetry of d-dimensional (dD) quasiperiodic structures is incompatible with lattice periodicity in dD physical space. However, dD quasiperiodic structures can be described as irrational sections of nD (n > d) periodic hypercrystal structures. By appropriate oblique projection of particular hy…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTComment on "Direct Observation of a Metastable Solid Phase of Mg/Al/CO3-Layered Double Hydroxide by Means of High-Temperature in Situ Powder XRD and DTA/TG"1Vicente RivesView Author Information Departamento de Química Inorgánica Universidad de Salamanca, Salamanca, Spain Cite t…
A nanostructure has been fabricated by photoelectrochemical etching (photoetching). The photoetching created a "nanohoneycomb" pattern made up of quadrangle cells, which were a few hundred nanometers wide and several micrometers deep. These cells were regularly ordered depending upon the crystallographic orientation.…
Electrostatic interactions are often critical for determining the specificity of protein-protein complexes. To study the role of electrostatic interactions for assembly of helical bundles, we previously designed a thermostable, heterotrimeric coiled coil, ABC, in which charged residues were employed to drive preferent…
A novel technique of adsorption porometry has been developed which allows us to measure pore size distribution of a thin porous film directly on a solid substrate in a simple way. The most important principle of this technique is the use of in situ ellipsometry to determine the amount of adsorbed/condensed in the film…
Nanoparticles of poly(lactic acid) (PLA) and of blends of PLA and monomethoxypoly(ethylene oxyde) (MPEO-PLA) were prepared by the double emulsion method. Sucrose was added to overcome nanoparticle aggregation with freeze-drying. Whereas PLA nanoparticles rapidly are phagocytosed by the mononuclear phagocyte system cel…
A photo-induced electron transfer (PET) model compound in the form acceptor–fluorophore–donor and its reference compounds were synthesized. Because the fluorescence of the fluorophore 4-amino-1,8-naphthalimide (ANI) was quenched by any PET process from donor to fluorophore (PET input path) or from fluorophore to accep…
The mechanism of the OH-initiated oxidation of isoprene in the presence of NO and O2 has been investigated using a discharge-flow system at 298 K and 2 torr total pressure. OH radical concentration profiles were measured using laser-induced fluorescence as a function of reaction time. The rate constant for the reactio…
The replacement of arteries with purely synthetic vascular prostheses often leads to the failure of such reconstructions when small-diameter or low-flow locations are concerned, due in part to the thrombogenicity of the internal graft surface. In order to improve long-term patency of these grafts, the concept of endot…
We present the results of electronic-structure, abinitio calculations on a set of perovskite-structured transition metal oxides, in which the transition metal ion has electronic configuration ). We perform an analysis of the QM solution for the bulk materials, based on a phenomenological, tight binding-like examinatio…
The well known methyltrioxorhenium-catalysed epoxidation of alkenes with aqueous H2O2 is significantly improved by conducting the epoxidation in trifluoroethanol; excellent reaction rates and yields can be obtained for a variety of (terminal) alkenes with only 0.1 mol% of catalyst.
The porphyrin–crown ether derivatives described here exhibit affinities to unprotected peptides of hitherto unknown magnitude in aqueous solution; the optical signal built-in to porphyrin receptors makes these applicable also to sensor techniques; the results can also form the basis of new catalytic systems, e.g. for…
Lumazine synthase catalyzes the penultimate step in the synthesis of riboflavin in plants, fungi, and microorganisms. The enzyme displays two quaternary structures, the pentameric forms in yeast and fungi and the 60-meric icosahedral capsids in plants and bacteria. To elucidate the structural features that might be re…
A strong case has been made by several authors that sharp, spherically symmetric shocks converging on the center of a spherical bubble driven by a strong acoustic field give rise to rapid compression and heating that produces the brief flash of light known as sonoluminescence. The formation of such shocks is considere…
We report a method to fabricate Ångstrom size pores in poly(methylsilsesquioxane) films in order to decrease the density and the dielectric constant of the film. Copolymers bearing methyl(trisiloxysilyl)units and alkyl(trisiloxysilyl) units are spin-coated and baked at 250 °C to provide rigid siloxane matrixes. Films…