Materials Literature
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While the columnar liquid crystalline phase in suspensions of plate-like colloids is by now well-established, little is known about the pathway leading to the formation of this highly ordered, self-assembled structure. Here, we present direct observations of the morphology and structure of micrometer-sized droplets of…
Polymorphism is important to study the structure–property relationship with a minimum number of variables. Compound 1-(9-anthryl)-2-(1-naphthyl)ethylene (ANE) can form three polymorphs by controlling the crystallization conditions, which belong to the P212121 space group for ANE-a, P21/c space group for ANE-b and P sp…
In this paper the global, direct and diffuse solar radiation incident on solar cells is simulated using the spectral model SMARTS2, for varying environmental conditions on the site of Setif. The effect of changes in total intensity and spectral distribution on the short circuit current and efficiency of nanocrystallin…
Understanding the coupled kinetic and thermodynamics factors governing colloidal nanocrystals nucleation and growth are critical factors in the predictable and reproducible synthesis of advanced nanomaterials. We show that the temporal temperature profile is decisive in tuning the particle shape from pseudo-spherical…
A template-directed method for the synthesis and organization of partially oxidized polypyrrole (PPy) nanoscale arrays within the solvent channels of glutaraldehyde-cross-linked lysozyme single crystals is presented. Macroscopic single crystals of the periodically arranged protein-polymer superstructure are electrical…
Large-scale sparse TiO2 nanotube arrays (Sparse-TNTAs) are fabricated and the sparsity is controlled “from no tube to compact” by manipulating the dissolution etching effect of the electrolyte in the anodization.
Reported is the development of nanostructured synthetic carbon materials that have been synthesized by thermal-decomposition of aromatic rich polyethers: poly(ether ether ketone) (PEEK) and poly(2,6-dimethyl-1,4-phenylene oxide) (PPO). These polymer based nanostructured carbons are efficacious for gas adsorption and s…
The electrochemical dealloying of single-phase Al2Au alloy in 1 M sodium halide (NaF, NaCl, NaBr and NaI) aqueous solutions at 270, 290 and 340 K has been systematically investigated in this work. The effects of halide ions and temperature on the dealloying behavior have been studied with electrochemical methods like…
A new photoluminescent bimetallic-3-hydroxypicolinate/graphene oxide composite was prepared by incorporation of the complex Na5[EuW2O6(picOH)8] (1; HpicOH being 3-hydroxypicolinic acid) on graphene oxide (GO). Photoluminescence studies (emission and excitation spectra and 5D0 emission decay curves) were performed on 1…
We investigate the low-temperature magneto-transport properties of monolayer epitaxial graphene films formed on the Si-face of semi-insulating 4 H−SiC substrates by a high-temperature sublimation process. A high-k top-gate on the epitaxial graphene is realized by inserting a fully oxidized nanometer-thin aluminum film…
This paper presents the synthesis of a series of nitronyl-nitroxide (NN), oxoverdazyl (OVZ) based mono-, and bi-radicals attached to 4-phenyl-2,6-bispyrazolylpyridine coupling unit, their optical, electron spin resonance (ESR) spectroscopic studies and computational analysis. The ESR studies revealed that the axial ze…
Lead-free 0.94(K 0.5 Na 0.5 NbO 3 )–0.06(LiSbO 3 ) (KNN–LS) ceramics were prepared by conventional solid-state reaction route (CSSR). For single perovskite phase formation the calcination was done at 850 °C for 6 h. Whereas for obtaining dense morphology the sintering of KNN–LS ceramics was carried out at 1060, 1080,…
We prepared a heterogeneous SiO2-B2O3-Na2O-Al2O3-CaO-La2O3 glass containing 11.76 wt.% AmO2. The composition of this heterogeneous material was determined from that of non-active glasses in which Am was fully substituted by Nd. For trivalent ion concentrations above the solubility limit, crystal formation occurred in…
Diatoms have ordered three dimensional porous exoskeletons (frustules) comprised primarily of amorphous silica which can be used as templates for materials applications. Hydrolysis of titanium(IV) isopropoxide (TIP) in the presence of surface bound poly(4-vinyl pyridine) or citric acid results in the formation of anat…
We report a simple and effective method for tailoring ordered three-dimensional alumina taper-nanopore arrays, dispensing with any unavailable and expensive top-down equipment.
Oxypeucedanin hydrate monoacetate (Mol. Formula = C18H18O7) micro-crystals were obtained by acetylation of oxy-peucedanin hydrate, a furanocoumarin, isolated from the roots of Prangos pabularia. The composition related structural, thermal and optical properties were investigated. All the crystals were found to have tr…
We studied the optoelectronic properties of six possible structures of the (ZnO)(60) cluster using density functional theory (DFT). Vertical ionization energies and electron affinities are calculated through total energy differences, while the optical absorption spectra are obtained by using hybrid time-dependent DFT.…
The transversal conductance through thin multi-layered films of reduced graphene oxide was studied as a function of temperature in a solid-state device setup designed for molecular electronic measurements. Upon cooling to cryogenic temperatures, the resistivity of the films increased by about three orders of magnitude…
Atom probe tomography has been used to investigate nanoscale features in the yttrium oxide dispersion strengthened steel ODS Eurofer, which is a perspective structural material for the reactor cores. In the initial material, a large number (∼2 × 10 24 m −3 ) of ultrafine (∼2.5 nm in diameter) clusters enriched in yttr…
We have designed and fabricated a novel photodetector that is composed of sandwich-structured n-type zinc oxide nanorods arrays, p-type polyaniline thin film, and dye-modified n-type ZnO nanorods arrays. When the photodetector is alternatively illuminated by ultraviolet and visible light from the same direction, it ou…