Materials Literature
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In this work, we describe a single-step synthetic route to obtain magnetic nanocrystals (MN), Fe3O4 nanocrystals, soluble in different solvents. To synthesize grafted MN in a single step, we used a high molecular weight solvent (a polyol) that can be attached to the particle surface, which then transfers its solubilit…
We report a novel superconducting (SC) and antiferromagnetic (AF) hybrid state in SrFe(2)As(2) revealed by (75)As nuclear magnetic resonance (NMR) experiments on a single crystal under highly hydrostatic pressure up to 7 GPa. The NMR spectra at 5.4 GPa indicate simultaneous development of the SC and AF orders below 30…
We report a facile synthesis of silver nanoparticles (AgNPs) by using a new reducing agent, pretreated N -methyl-pyrrolidone (NMP*). The resulting AgNPs are characterized by using UV−vis, TEM, and X-ray spectroscopy. These AgNPs exhibit strong surface enhanced Raman scattering response on addition of 4-mercaptobenzoic…
The requirements for the self-assembly of 2,3-annulated core-substituted NDIs into discrete worm-like nanostructures are explored in MeOH-CHCl(3) solutions. AFM was used to visualize and characterize the structures formed at precise proportions of solvent mixes.
Bi 0.8 Dy 0.2− x La x FeO 3 (BDLFO x ) ( x = 0, 0.10 and 0.20 respectively) nanoparticles were prepared by the ethylene glycol based sol–gel method. The influence of the average radius and the effective magnetic moment of Bi-site ion on the structure, magnetic and dielectric properties, and the effective magnetic susc…
A structural investigation was carried out on a perovskite-based solid solution of xNa1∕2Bi1∕2TiO3–(1−x)BaTiO3, where x⩽0.40. The crystal structure remains tetragonal, P4mm, for these compositions; however, enhancement of the tetragonality up to 0.9% of the unit cell was observed as a function of doping which is an un…
Abstract Three new cluster‐based Cu II –azide coordination polymers, [Cu 8 (N 3 ) 16 (222‐tet) 2 ] n ( 1 ), [Cu 10 (N 3 ) 20 (dien) 2 ] n ( 2 ), and [Cu 12 (N 3 ) 24 (Me 5 dien) 2 ] n ( 3 ) as well as a 1D polymer [Cu 2 (N 3 ) 4 (dien)] n ( 4 ) were prepared by hydrothermal reactions of Cu II ions with NaN 3 in the pr…
Crystalline nucleation is investigated during the dynamical heat treatment of a ZrO 2 –MgO–Al 2 O 3 –SiO 2 glass by high‐temperature Zr K‐edge X‐ray absorption near‐edge spectroscopy. In the parent glass, the Zr coordination number is higher than in most glasses, explaining the structural instability of Zr during ther…
Chemically synthesized, thiol capped undoped, and Fe doped CdSe nanoparticles (NPs) have been investigated using a variety of physicochemical techniques. The electron spin resonance spectra exhibit two distinct signals at $g\ensuremath{\sim}4$ and $g\ensuremath{\sim}2$ characteristic of ${\text{Fe}}^{3+}$ ions occupyi…
This work investigates the use of a layered Ca−Al double hydroxide (hydrocalumite) as precursor, after its thermal activation, of base catalysts for the methanolysis of sunflower oil. Above 750 °C, hydrocalumite is transformed into a mixture of CaO and mayenite (Ca 12 Al 14 O 33 ). Another Ca−Al material obtained unde…
The first iron(ii) complex of 2,5-di-(2-pyridyl)-1,3,4-thiadiazole (L), namely [Fe(II)(L)(2)(NCS)(2)], has been synthesised and studied by magnetic susceptibility measurements, Mössbauer spectroscopy and X-ray diffraction. It has been found to undergo thermally-induced spin crossover featuring two well-separated, abru…
We employ an ab initio scalar relativistic density functional theory based method to calculate the ground state structures and the electronic properties for Au 19 X clusters, X being the alkali metal atoms, Li, Na, K, Rb, and Cs as well as the coinage metal atoms, Ag and Cu. The tetrahedral Au 20 clusters have been do…
Abstract In recent years, nanofiber production via electrospinning has gained importance because of superior properties of submicron fibers. In this study, the effect of molecular weight, concentration of solution, electric conductivity, surface tension and solution viscosity of the polymer solution on the roller elec…
The remote plasma deposition of hydrogenated amorphous carbon (a-C:H) thin films is investigated by in situ spectroscopic ellipsometry (SE). The dielectric function of the a-C:H film is in this paper parametrized by means of B-splines. In contrast with the commonly used Tauc–Lorentz oscillator, B-splines are a purely…
Surfactants are used in synthesis and dispersion of carbon nanotubes (CNTs) and can thus be released into the environment with CNTs. In this study, it was observed that the coupled release of surfactants and CNTs altered the sorption of organic contaminants on the CNTs. The cationic surfactant, cetylpyridinium chlorid…
The effects of addition of an organoclay on the morphology and the mechanical properties of blends of an amorphous polyamide (a-PA) and an elastomer (with and without grafted maleic anhydride) prepared via melt processing are reported. Transmission electron microscopy (TEM) and wide-angle X-ray scattering (WAXS) were…
A new spin crossover (SCO) coordination polymer, {[Fe(II)(4-methylpyridine)(2)][Au(I)(CN)(2)](2)}(n) () has been synthesized. The complex () has been observed to have a thermal induced three-step SCO transition, which is unprecedented behavior as compared with existing SCO complexes. In the complex, about 18%, 41% and…
The above-bandgap illumination of colloidal ZnO nanoparticles (NPs) in ethanol solutions is found to lead to reversible shifts of the absorption and photoluminescence (PL) excitation spectra, indicating charging of the nanoparticles with electrons. A rapid drop of deep-level PL intensity at the early stage of illumina…
Teratological forms of diatoms are non-adaptive phenotypic abnormalities caused by various environmental stresses. Heavy metal contamination and artificial growth conditions are the best known causes. In fact, the recording of abnormal cells in a diatom population or community can give both a temporal and quantitative…
Trivalent dysprosium‐doped cubic yttrium oxide (Y 2 O 3 ) nanophosphors were prepared by combustion synthesis using glycine as fuel. The resulting products were characterized by Raman and FT‐IR spectra to evaluate the vibrational features of the samples. X‐ray diffraction patterns confirmed the formation of a pure cub…