Materials Literature
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The structure, thermal expansion coefficients, and ionic and electronic conductivities of Ce 1 - x Tb x O 2 - δ ( x = 0−0.30) solid solutions, prepared hydrothermally for the first time, were investigated. The uniformly small particle size (33−40 nm) of the hydrothermally prepared materials allows sintering of the sam…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
Free-Standing Films-Basic Physical Notions and Properties. Experimental Techniques. Thinning, Stratification and Rupture. Orientational and Phase Transitions. The Field-Induced Effects. Structure and Defects of Stable Thin Films. Different Applications of Free-Standing Liquid Crystalline Films. Index.
The syntheses and characterization of mesostructured hexagonally ordered surfactant composites using zirconium sulfate ions as inorganic precursor species are described. On the basis of the mesostructured zirconium sulfate surfactant composites, two porous MCM-41 analogues have been synthesized: zirconium oxide−sulfat…
Coupled cobalt and nickel sandwich complexes with one positive charge are paramagnetic mixed-valence species, in which the charge is delocalized in solution yet localized in the solid state. When the mono- and dications (figure) have more than one unpaired electron, antiferromagnetic interaction across the ligand brid…
It is demonstrated that there are distinct off and on states in the current–voltage characteristics of porous silicon (PS) diodes, and that the visible electroluminescence (EL) is observed in the on state. The PS diodes are composed of semitransparent thin Au films, rapid thermal oxidization (RTO)-treated PS layers (∼…
Using Monte Carlo simulations we find that a monodisperse symmetric ABCD star-block copolymer melt undergoes a microphase separation, in which the three space is divided into cellular domains. The domain shape is a cubooctahedron known as the Wigner-Seitz cell of the body-centered cubic lattice. To be precise, the sha…
The structures of three colloidal liquids at their triple points are studied. The interparticle attraction in these liquids, induced by the depletion effect of free polymer, has variable range. In one case, the liquid state is ``marginal''---in the phase diagram the critical point lies nearly on the line of triple coe…
Nanopowders of Bi2Ti2O7 with various La modifications were fabricated by chemical coprecipitation. As sintered at high temperature, the phase structure in powders translates into (La0.22Bi0.78)4Ti3O12 and (La0.26Bi0.74)2Ti4O11 with increasing La concentration, respectively. Dielectric and nonlinear resistivity investi…
Rapid thermal annealing of sputter-deposited chalcogenide glasses is demonstrated to yield superior quality films which are used to fabricate low loss (<0.3 dB/cm) photoinduced channel waveguides in chalcogenide glasses. This process also enhances the photosensitivity and the magnitude of photoinduced index cha…
We have studied fragmentation and ionization of ${\mathrm{C}}_{60}$ by ${\mathrm{He}}^{+}$ impact over a velocity range from 0.1 to 1 a.u. where a transition from vibrational to electronic excitation is predicted. With increasing velocity we observe a strong decrease of evaporative processes ( ${\mathrm{C}}_{60\ensure…
Electronic properties of a doped zigzag nanotube are investigated by a self-consistent tight-binding method. We propose that a doped nanotube with donor atoms on one side and acceptors on the other can function as a nano diode. It is shown that a potential step in the tube, created by two different types of doping in…
A novel type of P=Se⋅⋅⋅I−P bridging is found in the solid-state structures of iodophosphane selenides. These molecules can be viewed as new building blocks for the design of directed donor–acceptor interactions (see diagram) within chains, helices and “soft–soft” base pairs.
Elongated honeycombs of interknitted molecular ribbons comprising cyanuric acid and triaminopyrimidine are assembled through a programmed combination of hydrogen-bond triplexes and ion-pairing interactions.
A defect generation mechanism, namely, the grain-boundary Frenkel pair model, and corresponding diffusion mechanisms during electromigration are developed using atomic simulation techniques in Al and Al–Cu. We contend that large numbers of interstitials and vacancies exist at grain boundaries and both contribute to ma…
We present an analysis of the effect of interface stress on strain in bulk in an open system with a large interface-to-volume ratio, at equilibrium with the solute at a controlled chemical potential. The results are relations for interface stress and for solute concentration in the bulk as a function of measurable par…
Several 1(4)- and 2(3)-tetraalkoxy-substituted phthalocyanines (shown) were synthesized from the corresponding (R,S)-, (R)-, and (S)- alkoxy-substituted phthalonitriles, and the four structural isomers formed for each phthalocyanines were separated by HPLC. The influence of (R,S)-, (R)-, and (S)-substituents on the is…
The binding affinities of [18]crown-6 and La3+, Nd3+, Gd3+, and Yb3+ have been reproduced in MeOH with Monte Carlo free-energy perturbation calculations which used newly derived Lennard-Lones parameters for the Ln3+ ions. The figure shows the complex of a lanthanide ion and the crown ether.
We have measured specific heat, magnetization, and electrical transport properties of ${\mathrm{La}}_{0.875}{\mathrm{Sr}}_{0.125}\ensuremath{-}{\mathrm{MnO}}_{3}$ single crystals in magnetic fields up to 14 T. In addition to a ferromagnetic transition two structural phase transitions are observed with one of the latte…
The multicomponent self-assembly of ditopic linear ligands, circular ligands and copper(I) or silver(I) ions leads to the exclusive formation of a series of cylindrical inorganic architectures containing an internal cavity whose height may be modulated by the nature of the ligands used (see picture: 1: 20 Å; 2: 33 Å).…