Materials Literature
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Abstract Structural and magnetic properties of Ba 2 (B,Re) 2 O 6 (B = Fe, Mn, Co and Ni) double‐perovskite oxides have been investigated. Rietveld analysis shows that all our synthesized samples are single phase and crystallize at room temperature in the cubic double‐perovskite structure with Fm3m space group. Magneti…
Horn-shaped yttrium oxide nanotubes (“nanohorns”) with base diameters ranging from 450 to 900 nm, tip diameters ranging from 80 to 100 nm, and lengths of 3.9 to 16.5 μm were prepared by electrodeposition on a vapor deposited gold substrate in a nonaqueous medium.
Potassium n -butyl 3-thiolate-1-propionate (K−nBMP) and dipotassium 3-thiolate-1-propionate (K−MPA) initiated anionic polymerization of ethylene oxide (EO) to yield carboxy-functionalized poly(ethylene glycol)s (HOOC−PEG) with predicted number-average molecular weights ( M n up to 18 700) and narrow molecular weight d…
Two polyoxometalate Keggin-type anions, alpha-PM12O40(3-) (M = Mo, W), were transferred to the gas phase by electrospray; their electronic structure and stability were probed by photoelectron spectroscopy. These triply charged anions were found to be highly stable in the gas phase with large adiabatic electron detachm…
The synthesis and characterization of a main-chain smectic liquid-crystalline polymer system designed for development into electromechanical actuators is described. The chemical structure is chosen to provide a large electroclinic effect in the SmA* phase, with large concomitant layer shrinkage (a rare combination). T…
A 1:1 adduct of chloranilic acid with 5,5'-dimethyl-2,2'-bipyridine, in which two kinds of molecules are connected by infinite hydrogen bond chains, exhibits a distinct dielectric phase transition when cooled. Below T(c)(=318 K) the hydrogen atoms participating in hydrogen bonding undergo long-range ordering and form…
The heterocyclic compounds with selenium atom in the ring such as selenirenes, selenophenes, selenadiazoles, selenatriazoles, benzisoselanazolones and some others are presented as the reagents and intermediates employed in synthesis of alkenes, alkynes and nonselenium heterocycles or as the catalysts for hydroperoxide…
The formation and the structure of the ternary complexes of trivalent Am, Cm, and Eu with mixtures of EDTA+NTA (ethylenediamine tetraacetate and nitrilotriacetate) have been studied by time-resolved laser fluorescence spectroscopy, 13C NMR, extended X-ray absorption fine structure, and two-phase metal ion equilibrium…
Abstract The structural and electronic properties of ScSb, ScAs, ScP and ScN III–V materials are investigated within a version of the first‐principles full potential linear muffin‐tin orbitals method (FPLMTO) that enables an accurate treatment of the interstitial regions. At high pressure, the transition from rocksalt…
Abstract Nano‐sized manganese ferrite (MnFe 2 O 4 ) powder has been synthesized via coprecipitation method, using FeSO 4 ·7H 2 O and MnSO 4 ·H 2 O as starting materials. An aqueous solution of the starting materials, containing Fe 2+ and Mn 2+ in the ratio required in the ferrite, was poured into an NaOH alkaline solu…
Ligand-exchange reactions of 4-( N, N -dimethylamino)pyridine-capped gold nanoparticles (DMAP−Au NP) with functionalized thiols (RSH) were investigated. A simple, convenient, and facile synthesis method has been developed. An important feature of this method is its requirement of only very modest quantities of excess…
The gelation kinetics of self-assembled hydrogels consisting of the β-hairpin peptide MAX1 are investigated using microrheology and far-UV circular dichroism (CD) spectroscopy. The intramolecular folding of this peptide is engineered to control its self-assembly into β-sheet-rich hydrogels. When the peptide is unfolde…
We present a structural study of the mesophases of three achiral bent-core compounds with azo and azoxy bonds. The study is based on textures observation and small-angle X-ray diffraction. It is found that the materials exhibit columnar and tilted smectic mesophases. Optical second-harmonic generation measurements are…
A simple method of vapor deposition for the shape selective synthesis of ZnO structures, namely, multipods, submicron wires, and spheres, has been successfully demonstrated. A plausible growth mechanism based on the studies of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractio…
Mg10Ir19B16, a previously unreported compound in the Mg-Ir-B chemical system, is found to be superconducting at temperatures near 5 K. The fact that the compound exhibits a range of superconducting temperatures between 4 and 5 K suggests that a range of stoichiometries is allowed, though no structural evidence for thi…
First-principles study of hydride molecule adsorption on $\mathrm{C}(001):\mathrm{H}$ reveals unexpected dihydrogen bonding. It implies that H is more electronegative than C, despite that the contrary has been widely used to explain the observed diamond work function reduction due to surface hydrogenation. We resolve…
Through magnetic and dielectric measurements, a simultaneous phase transition of spin and lattice systems observed previously at 37.2 K of RbCoBr 3 have been investigated by doping with nonmagnetic Mg impurities. A mutual reduction in the ferroelectric Curie temperature T C and the Néel temperature T N due to the enha…
This work presents a theoretical study of the excitonic properties of ${\mathrm{Si}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}$ cylindrical quantum wires surrounded by a Si matrix, considering two possibilities for the conduction band alignment, type I and type II. The effect of nonabrupt interfaces between these materials…
A [Ru(bpy)(3)](2+) (bpy=2,2'-bipyridine)-doped WO(3) film was prepared as a base layer on a substrate by cathodic electrodeposition from a colloidal triad solution containing peroxotungstic acid (PTA), [Ru(bpy)(3)](2+), and poly(sodium 4-styrenesulfonate) (PSS). A Prussian blue (PB; Fe(II)-Fe(III)) film was cathodical…
We report on the crystal structures of two polymorphs of scyllo-inositol. Crystallization of this inositol initially failed to yield a single crystal suitable for structure solution, so a computational prediction of the low-energy forms was performed in parallel with the crystallization experiments. When a single crys…