Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRobust Triplet Molecule: Cationic Diradical of 3,4'-Bis(diphenylamino)stilbeneTsuyoshi Michinobu, Masahiro Takahashi, Eishun Tsuchida, and Hiroyuki NishideView Author Information Department of Polymer Chemistry, Waseda University, Tokyo 169-8555, Japan Cite this: Chem.…
Electropolishing of single-crystal aluminum faces yield different patterns from (111), (110), and (100) faces at different potentials. The stripes that dominate the (110) face extend throughout a 1 cm2 sample in the same direction.
Using a sequential adsorption process, thin film multilayer assemblies of polymers which photophysically interact via the Förster energy transfer mechanism have been fabricated and characterized in order to determine the level of interpenetration between layers. The assemblies consisted of layers of poly(phenylene vin…
Measurements of the dc transport properties and the low-frequency conductivity noise in films of charge ordered Nd_0.5Ca_0.5MnO_3 grown on Si subtrate reveal the existence of a threshold field in the charge ordered regime beyond which strong non linear conduction sets in along with a large broad band conductivity nois…
A systematic approach is proposed to derive the governing equations and boundary conditions for strain gradient plasticity in plane-stress deformation. The displacements, strains, stresses, strain gradients and higher-order stresses in three-dimensional strain gradient plasticity are expanded into a power series of th…
Surface structure analysis is an important area of research, and in recent years notable advances have been made in this field, both in improved techniques for studying surfaces and in methods of analyzing them. This review aims to summarize the techniques available, particularly those relating to electron microscopy,…
Accurate predictions of the performance of frequency conversion requires knowledge of the spatial variation of departures from the phase-matching condition in the converter crystals. This variation is caused by processes such as crystal growth and crystal surface finishing. Gravitational sag and mounting configuration…
The multichannel CH + CH reaction was studied, at room temperature, in a low-pressure fast-flow reactor. CH was obtained from the reaction of CHBr 3 with potassium atoms. An intense chemiluminescence from C 2 H(A 2 Π) and a much weaker one from C 2 (d 3 Π g ) were observed. The C 2 H(A 2 Π) emission spectrum appeared…
We have investigated the oxidation state and size effects on the electronic structure of 10 and 20 nm CoO nanoparticles by means of surface spectroscopies. It has been concluded that the surface of the as-grown CoO nanoparticles is oxidized to Co 3 O 4 . After annealing of the nanoparticles in UHV at 600 °C, the surfa…
Nitrogen sorption is a commonly used experimental technique for the characterization of solids that are primarily mesoporous. The standard nitrogen adsorption experiment can also detect pores at the lower end of the macropore range, up to perhaps 3000 or 4000 Å. However, some solids of industrial importance contain ma…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis and Quantum Mechanical Structure of sym-Pentamethylcorannulene and DecamethylcorannuleneT. Jon Seiders, Kim K. Baldridge, Eric L. Elliott, Gunther H. Grube, and Jay S. SiegelView Author Information San Diego Supercomputer Center La Jolla, California 92093-050…
The synthesis and characterization of a new series of mesogen-jacketed liquid crystal polymers, poly{2,5-bis[(para-substituted phenyl)oxycarbonyl]styrene}s, based on 2-vinylterephthalic acid are reported. These polymers formed very stable liquid crystal phases above the glass transition temperatures. A brief compariso…
Magnon linewidth of La_1.2 Sr_1.8 Mn_2 O_7 near the Brillouin zone boundary is investigated from both theoretical and experimental points of view. Abrupt magnon broadening is ascribed to a strong magnon-phonon coupling. Magnon broadening observed in cubic perovskite manganites is also discussed.
Hexagonal BaTiO_3 undergoes a structural phase transition to an orthorhombic C222_1 phase at T_0 = 222 K. The transition is driven by a soft optical mode with E_2u symmetry whose couplings force the appearance of a spontaneous E_2g strain (improper ferroelastic character). Staying within the same E_2u subspace, the sy…
We reexamine two essential issues within the Peierls-Nabarro model which are critical in obtaining accurate values for the Peierls stress. The first issue is related to the sampling scheme of the misfit energy across the glide plane and the second one is the effect of relaxation on the Peierls stress. It is shown that…
New approach on interpretation and processing of Raman spectra of complex perovskites is suggested. Raman spectra of $PbMg_{1/3}Nb_{2/3}O_{3}$ and $% PbSc_{1/2}Ta_{1/2}O_{3}$ are successfully described on the basis of the phonon-confinement model and validity of the method is demonstrated on good agreement of experime…
The linear generalized equation described in this paper provides a further dimension to the prediction of lattice potential energies/enthalpies of ionic solids. First, it offers an alternative (and often more direct) approach to the well-established Kapustinskii equation (whose capabilities have also recently been ext…
Kinetics and dynamics of CO oxidation have been studied on a stepped Pd(335) surface at a steady-state condition and compared with those on flat Pd(111). The infrared (IR) chemiluminescence technique was applied to determine where the active catalytic sites are on the Pd(335) surface. Since the vibrational energy stat…
We present a series of new 6,6‘-distyryl-3,3‘-bipyridine derivatives synthesized via a Knoevenagel condensation reaction and disubstituted with electron donor and acceptor groups. These molecules were characterized by spectroscopic methods (NMR, Raman, UV−vis, photoluminescence). These compounds were all found to exhi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorDendrimers with Both Hydrophilic and Hydrophobic Chains at Every EndYijun Pan and Warren T. FordView Author Information Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078 Cite this: Macromolecules 1999, 32, 1…