Materials Literature
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Abstract The intercalation complex of a kaolinite from Cornwall, UK, with dimethylsulfoxide (DMSO) was studied by high-temperature X-ray diffraction (HTXRD), differential thermal analysis (DTA) and thermogravimetry (TG). The X-ray pattern obtained at room temperature indicated that intercalation of DMSO into kaolinite…
We consider the Lyapunov functional, of the rescaled Extended Fisher-Kolmogorov equation This is a fourth order generalization of the Fisher–Kolmogorov or Allen–Cahn equation. We prove that if ε → 0, then tends to the area functional in the sense of Γ-limits, where the transition energy is given by the one-dimensional…
Nicht nur hoch aktiv bei der Ethylenpolymerisation sind Bis(imino)pyridin-Eisen-Komplexe, sie katalysieren auch effizientes Kettenwachstum an Zinkzentren – formal eine eisenkatalysierte Aufbaureaktion am Zink (siehe Schema). Die erhaltenen Alkylketten können von den Zinkzentren durch eine Olefinaustauschreaktion verdr…
Two ferroelectric liquid crystals containing the naphthalene moiety were synthesized from 2(S)-[2(R)-methylhexyloxy]propionic acid and its (S, S)-diastereomer. Their mesogenic properties are compared with those of the analogous mesogens containing the biphenyl ring.
The cobalt(II) compounds ([Co(imid) 2 ] x (1), [Co(2-meimid) 2 ] x (2), [Co(4-meimid) 2 ] x (3), [Co(benzimid) 2 ] x (4), and [Co 3 (imid) 6 (imidH) 2 ] x (5) (imid = imidazolate, 2-meimid = 2-methylimidazolate, 4-meimid = 4-methylimi dazolate, benzimid = benzimidazolate)), have been synthesized and structurally and m…
Two forms of NAD-dependent D-mandelate dehydrogenase (D-ManDHs) were purified from Enterococcus faecalis IAM 10071. While these two enzymes consistently exhibited high activity toward large 2-ketoacid substrates that were branched at the C3 or C4 position, they gave distinctly different K(m) and V(max) values for thes…
This paper presents the results of a theoretical study of deep nitrogen vacancy levels and of small clusters of nitrogen di-and trivacancies, including the nearest neighbor defects in one layer of graphite-like boron nitride, made using the model-pseudopotential and supercell methods. The calculated spectra and oscill…
The lacunary α2-[As2W17O61]10− derived from the Dawson molecule α-[As2W18O62]6− was used as a ligand for the following metal cations: Mn2+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+. The cyclic voltammograms of this lacunary precursor species, as well as those of the substituted complexes were run in a medium at pH = 3. A syste…
(CdO)y(ZnO)1–y thin films have been prepared by the sol–gel process, based on precursor solutions used separately for such oxides. The Cd/(Cd + Zn) atomic ratio in solution ranged from 0 to 0.32. These compositions were selected on the basis of an observed abrupt fall, of ca. four orders of magnitude, in the resistivi…
Nanostructured MnFe2O4 particles in the size range 7–30 nm are prepared by the thermal decomposition of manganese iron citrate precursor at different temperatures (623–973 K) in an inert atmosphere. The Curie temperature (TC) of the as-prepared MnFe2O4 nanosized particles is found to be higher than the bulk material b…
The effective thermal conductivity of single and multilayer AlN/diamond composite films deposited on silicon substrate with a planar interface is determined experimentally. As a result of the small thickness and the good crystalline quality of the AlN and diamond films, the contribution to the effective thermal resist…
Abstract The crystal structures of two K 1- x Cs x BSi 2 O 6 solid solutions have been refined at room temperature by the Rietveld method: x = 0.12, a = 12.6858(4) Å, R wp = 7.66%, R F = 5.56% and x = 0.50, a = 12.8480(2) Å, R wp = 7.64%, R F = 3.10%. They are isostructural to cubic KBSi 2 O 6 with the space group I 4…
Abstract The adsorption of imidazole on a roughened polycrystalline iron electrode was investigated by the SERS technique at pH values of neutral, 11 and 14 and compared with those from each solution. The results indicated that imidazole was adsorbed as mainly the neutral form and/or a certain amount of ylide form on…
Based on experimentally motivated assumptions, a new kinetic model of protein crystallization by mass-convection than by bulk diffusion is proposed. It is assumed that the charged-mass conservation law is being fulfilled, and that the attractive potential is of (screened) electrostatic nature. The role of the double-l…
Abstract Sedimentary zeolite occurrences are widespread in Central and Western Anatolia, Turkey. Erionite occurrences in Central Anatolia have significant health implications for inhabitants of the region. The widespread occurrences of zeolites are generally associated with volcano-sedimentary rocks and consist of low…
Control over crystallographic orientation in ceramic thin films is important for highly anisotropic structures. Layered perovskites, like Bi 4 Ti 3 O 12 , have interesting properties associated with their ferroelectric nature, which may be fully exploited only when films are highly textured. Textured films of this tit…
I determined the phase boundaries for regularly branched block copolymers in the self-consistent classical path, circular/spherical unit cell approximation. In contrast to the case for linear chains, end-free “dead” zones are highly suppressed for highly branched molecules, greatly simplifying the integral equations t…
In an attempt to relate architecture to physical properties through a systematic study of degree of branching (DB), we recently reported the copolymerization of a series of AB/AB 2 monomers ranging from 0 to 1 mole fraction AB monomer content ( x AB ). However, the DB of copolymers with 0.25 < x AB < 1.0 were not meas…
A new organic ligand bearing four coordination sites that may be metallated in a stepwise manner is described, together with its CuII and FeII derivatives. This may be considered as the first ligand precursor for trimetallic systems.
Novel 2H-chromenes derived from hydroxycoumarins were synthesized, and their photochromic behaviour was studied under flash-photolysis conditions, showing a wide absorption range in the visible region. All the compounds exhibit low fluorescence, which apparently has no negative effect on their photochromic properties.