Materials Literature
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A new modification of MnSb 2 S 4 was synthesized by solid state reaction of MnS, and Sb 2 S 3 at 500 °C. The monoclinic, purple-red compound crystallizes in the HgBi 2 S 4 structure type. Single crystal measurements provided the space group C2/m (no. 12) with a = 12.747(3) Å, b = 3.799(1) Å, c = 15.106(3) Å, β = 113.9…
In this work we have studied the dispersion of the disorder-induced (D) and the second-order (G') Raman bands in single wall carbon nanotubes using several laser excitation energies (E laser) in the range 1.5-3.0 eV. An anomalous step-like behavior was observed in the E laser dependence of the G'-band frequency. This…
Nickel zinc ferrite of composition Ni0·5 Zn0·5 Fe2O4 was prepared by the citrate precursor method at temperatures as low as 100°C. This is much lower than those used in the conventional ceramic method for the preparation of ferrites (~1000°C). The dc resistivity of the sintered specimens was observed to be ~108 Ω cm w…
[reaction: see text] A cerium(IV) double decker porphyrin (1) bearing four 4-methoxyphenyl groups was synthesized. Compound 1 shows a positive, homotoropic allosteric effect in metal recognition of Ag(+) ion, and the peripheral pi clefts of 1 act as effective binding sites for Ag(+) ion.
This work reports Raman detection of the tetragonal $\ensuremath{\rightarrow}$ monoclinic phase transition in ${\mathrm{PbZr}}_{0.52}{\mathrm{Ti}}_{0.48}{\mathrm{O}}_{3}$ ceramics near the morphotropic phase boundary at low temperatures. The transition is characterized by changes in the frequency of lattice modes with…
Inorganic nano- and microtubes intercalated with silver and gold are reported here for the first time. These alloyed phases of MoS2 and WS2 are stabilized by the tubular structure—remaining unknown in the bulk material. Analysis with TEM shows that the Au intercalated tubes (the Figure shows the termination of an Au–W…
The Adam-Gibbs paper [G. Adam and J. H. Gibbs, J. Chem. Phys. 43, 139 (1965)], one of the most cited works in physics, has a continuing influence on research into glass transition. This paper is generally considered as the turning point from rare free volume to small configurational entropy as the reason for slow mole…
The LB technique is an important way to obtain the ordered aggregate of nanometre-sized particles. However, with the usual LB technique only those particles capped by short-chain molecules (<C 12 ) can form a highly ordered two-dimensional (2D) arrangement. When the capping molecules become longer, it is difficult to…
The kinetics of oxidation of cyclohexene, cyclohexen-1-ol, and indene by cis -[Ru IV (bpy) 2 (py)(O)] 2+ (bpy = 2,2‘-bipyridine and py = pyridine) have been studied in CH 3 CN. The reactions are first-order in both Ru IV =O 2+ and substrate in an initial, rapid stage in which Ru(IV) is reduced to Ru(III). The rate con…
The reactivity of AlN powder in diluted inorganic acids was studied by measuring the pH and temperature during its hydrolysis. At very low starting pH (pH ∼1) no reaction was observed, regardless of the acid used. In contrast, in a less acidic environment, i.e., at higher pH values (pH ∼3), the reaction was fast enoug…
Surface-assisted orientational control of discotic liquid crystals (DLCs) induced by photoaligning thin films of an azobenzene-containing polymer is described. The photochemical technique developed can be used to photopattern DLC films (see Figure), which may have applications in novel molecular devices such as optica…
Polyamidoamine dendrimers, constructed on the surface of silica, were phosphonated using diphenylphosphinomethanol (prepared in situ) and complexed to form a palladium-dimethyl TMEDA complex. This catalyst was found to be effective in the Heck reaction of aryl bromides with both butyl acrylate and styrene, affording c…
The subtilisin propeptide functions as an intramolecular chaperone (IMC) that facilitates correct folding of the catalytic domain while acting like a competitive inhibitor of proteolytic activity. Upon completion of folding, subtilisin initiates IMC degradation to complete precursor maturation. Existing data suggest t…
We present x-ray diffraction data, which demonstrate that after high field poling, solid solutions of lead zinc niobate with 8% lead titanate (PZN–PT) consist of a mixture of a dominant monoclinic phase and a remnant tetragonal phase. To understand the origin of this engineered monoclinic phase we studied a Devonshire…
The electrochemical uptake of oxygen on a Ru(0001) electrode was investigated by electron diffraction, Auger spectroscopy, and cyclic voltammetry. An ordered (2 × 2)-O overlayer forms at a potential close to the hydrogen region. At +0.42 and +1.12 V vs Ag/AgCl, a (3 × 1) phase and a (1 × 1)-O phase, respectively, emer…
Secondary electron emission spectroscopy (SEES) is used to examine the transport and emission of low-energy electrons in diamond. In particular, SEES measurements from single-crystal (100) and (111) diamond and polycrystalline chemical vapor deposited (CVD) diamond are compared in order to examine the effect of crysta…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis and Macromolecular Helicity Induction of a Stereoregular Polyacetylene Bearing a Carboxy Group with Natural Amino Acids in WaterMitsuo Albert Saito, Katsuhiro Maeda, Hisanari Onouchi, and Eiji YashimaView Author Informatio…
Elastic moduli and dislocation core energy of the triangular solid of hard disks of diameter sigma are obtained in the limit of vanishing dislocation-antidislocation pair density, from Monte Carlo simulations that incorporate a constraint, namely that all moves altering the local connectivity away from that of the ide…
The hyperbranched polystyrenes are prepared by the self-addition free radical vinyl polymerization of N,N-diethylaminodithiocarbamoylmethylstyrene (DTCS). DTCS monomers play an important role in this polymerization system as an inimer that is capable of initiating living radical polymerization of the vinyl group. The…
Specimens of the form ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.2)$ are utilized to study the effect of electron doping on the magnetic saturation moment ${M}_{\mathrm{sat}}(5\mathrm{K}).$ The systematic behavior of ${M}_{\mathrm{sat}}(5\mathrm{K})$ vs x is understood throug…