Materials Literature
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A facile one-step template-free method based on a novel inside-out Ostwald ripening mechanism is developed for inexpensive mass preparation of hollow and hollow core/shell-type SnO2 nanostructures using potassium stannate as the precursor. As-prepared SnO2 hollow nanospheres (see figure) exhibit ultrahigh lithium stor…
The stability of the superconducting dissipationless and resistive states in single-crystalline NbSe2 nanobelts is characterized by transport measurements in an external magnetic field (H). Current-driven electrical measurements show voltage steps, indicating the nucleation of phase-slip structures. Well below the cri…
Abstract We have systematically studied the critical current and the magnetic susceptibility as a function of the cooling rate through the order‐disorder transformation near 80 K for the κ‐(BEDT‐TTF) 2 Br organic superconductor. Our results show that the magnetic properties of these compounds depend strongly on the co…
Abstract The relaxation of the initial magnetic permeability has been measured in polycrystalline tetravalent‐doped magnetite with nominal composition Me x Fe 3‐x O 4 (Me: Ti, Sn, Si) with 0 < x < 0.4. The samples have been sintered at 1400 ºC in a reducing CO 2 atmosphere. The time decay of the initial permeabi…
The Monte Carlo code ERO simulates the three-dimensional transport of impurity particles in a background plasma using the test particle approximation. it treats the interaction of the plasma ions, atoms and of the impurities with the plasma facing components (PFC).ERO modelling for ITER estimates the lifetime of the i…
WO(x) (2 < x < 3) and WS(2) nanostructures have been widely praised due to applications as catalysts, solid lubricants, field emitters, and optical components. Many methods have been developed to fabricate these nanomaterials; however, most attention was focused on the same dimensional transformation from WO(x) nanopa…
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…