Materials Literature
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The structure of the title compound, [Cu(C(6)H(7)N)(2)(Ag(CN)(2)(2)](n), is made up of neutral zigzag chains of [-NC-Ag-CN-Cu(4-Mepy)(2)(Ag(CN)(2))-NC-Ag-CN-] (4-Mepy is 4-methylpyridine). Neighbouring chains are linked by weak argentophilic interactions, with Ag.Ag distances of 3.2322 (12) A. The Cu atom, which lies…
The longitudinal (R1) and transverse (R2) relaxivities of the clinically used contrast agents Gd(DTPA)2-, Gd(DOTA)- and Gd(DTPA-BMA) have been determined in mixed aqueous metabolite solutions for choline, creatine and N-acetylaspartate. Measurements were performed at 1.5 T using a STEAM sequence on 25 mM metabolite so…
Abstract This International Standard specifies a total reflection x‐ray fluorescence (TXRF) method for the measurement of the atomic surface density of elemental contamination on chemomechanically polished or epitaxial silicon wafer surfaces. This method is applicable to elements with atomic number from 16 (S) to 92 (…
By the standard method proposed by Kolar and Nori [Phys. Rev. B 42, 1062 (1990)], a rigorous eight-dimensional (8D) trace map for a general model of Thue-Morse (TM) sequences is obtained. Using this trace map, the characteristics of electronic eigenstates in TM lattices are explored in a very broad way. Simultaneously…
Magnetic and structural properties for melt-grown single crystals of monolayered manganites R 0.7 Sr 1.3 MnO 4 (R = La, Pr, and Nd), possessing the K 2 NiF 4 type structure, have been investigated. On the bases of magnetization, neutron powder diffraction, and relaxation measurements, it is revealed that all the three…
We report the tuning of oxygen content of ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3\ensuremath{-}y}$ and its effect on electrical transport and magnetic properties. A small reduction of oxygen content leads to a decrease in sample resistivity, which is more dramatic at low temperatures. No significant c…
The ability to obtain highly oriented, transparent, and conducting thin films of CdO, onto silica substrates, is demonstrated by using a novel, low-melting, MOCVD precursor. The observed film properties are interpreted on the basis of nonstoichiometric composition of CdO.
Our research involves the development of new cationic materials for anion-based applications. We report the solvothermal synthesis and characterization of Pb(3)F(5)NO(3), a new layered lead fluoride material that, unlike the majority of layered and open-framework materials, is cationic in charge. The structure consist…
A WO3/Au composite thin film is prepared by depositing gold nanoparticles onto the surface of a vacuum-evaporated WO3 thin film through a spin-coating technique. It is found that the photochromism of the WO3 thin films are enhanced greatly after the modification with Au nanoparticles. The enhancement effect is explain…
The fluorination of arc-produced carbon material, which contained multiwall carbon nanotubes, was performed at room temperature by using a gaseous mixture of BrF 3 and Br 2 . The elemental composition of the sample was determined by X-ray photoelectron spectroscopy to be CF 0.3 Br 0.02, while graphite is fluorinated u…
The nature of the NO x species produced during the adsorption of NO at room temperature and during its coadsorption with oxygen on pure and sulfated zirconia has been investigated by means of in situ FTIR spectroscopy. The adsorption of NO on both samples occurs through disproportionation leading to the formation of n…
Cu Megan J McCarthy and Timothy J Rupert - Metastable grain boundaries: the roles of structural and chemical disorders in their energetics, non-equilibrium kinetic evolution, and mechanical behaviors Miao He, Yuchu Wang and Yue Fan - Molecular knots in biology and chemistry Nicole C H Lim and Sophie E Jackson -
Silver sulfide clusters are synthesized in the cavities of sodium and calcium zeolite A microcrystals by exposing the activated Ag + -loaded zeolite to H 2 S. The growth of the silver sulfide clusters during rehydration of the samples is investigated by means of diffuse reflectance spectroscopy. Monomers of Ag 2 S are…
We report on the phase behavior of a system of lithium perchlorate-doped poly(styrene- b -isoprene- b -ethylene oxide) (SIO) triblock copolymers. Two complete phase diagrams are described along the isopleth formed by equal volume fractions of polystyrene and polyisoprene and varying poly(ethylene oxide) contents at et…
Triptycenes have general applicability for increasing the alignment of fluorescent and dichroic dyes in LC hosts. Dyes containing varying numbers of triptycenes were synthesized to study the effect of free-volume alignment of triptycenes on the alignment of dyes. These dyes were designed such that multiple triptycenes…
Nanoporous alumina membranes are easily available by controlled anodization of aluminium surfaces in aqueous acids. Their properties, such as optical transparency, temperature stability, and pores of variable widths and lengths, make them a unique material to be filled by optically or magnetically interesting elements…
Two homologous achiral five-ring mesogens with lateral fluorine substituents on the core and on the outer rings are presented. Both compounds exhibit two B5 phases and the B2 phase. The high-temperature B5 phases possess an antiferroelectric ground state. The low-temperature B5 phase was found to be ferroelectric, whi…
We report the results of molecular dynamics simulations of self-interstitial cluster diffusion in pure \ensuremath{\alpha}-Fe and in a dilute Fe--1.0 at. % Cu alloy for a number of cluster sizes, $n<~20.$ We find that the effect of this oversized substitutional solute is to enhance the three-dimensional character o…
Ferromagnet/semiconductor hybrid structures are attractive and promising as artificial materials for 'semiconductor spintronics', because they can possess magnetic and/or spin-related functions and they have excellent compatibility with semiconductor device structures. We review our studies on the molecular beam epita…
Replacement of one of the pyrrole rings with a p-phenylene unit transforms porphyrin into p-benziporphyrin (1), an aromatic carbaporphyrinoid that locates two connected carbon atoms in the coordination core. p-Benziporphyrin forms a complex with cadmium(II) (2) with an unprecedented eta(2) Cd(II)-arene interaction.