Materials Literature
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An energy gap between the valence and the conduction band is the defining property of a semiconductor, and the gap size plays a crucial role in the design of semiconductor devices. We show that the presence of a two-dimensional electron gas near to the surface of a semiconductor can significantly alter the size of its…
The damping properties associated with hysteretic behavior of the pseudoelastic stress–strain (σ–ε) curves of NiTi shape memory alloy (SMA) wires were studied. Damping was characterized for wires of 2.46 and 0.5 mm diameter using samples of 120 mm in length. The effect of the frequency and size of the wire on the σ–ε…
This paper reports an alternative process to prepare hollow mesoporous silica spheres (HMS) using a single cationic surfactant with a tunable wall thickness and radially oriented pore structures. Using N,N-dimethylformide (DMF) as the intermediate solvent bridging the organic and aqueous phase, hollow mesoporous silic…
Here we describe the synthesis and purification of Au nanoplates grown directly on surfaces by a chemical seed-mediated growth method. The synthesis involves the attachment of 3-5 nm diameter Au nanoparticle (NP) seeds onto glass and Si/SiOx surfaces and their subsequent growth into larger Au nanostructures by the che…
In this paper, a very simple and efficient wet chemical route is proposed to directly produce single-crystal hyperbranched platinum nanostructures (HPNSs), in high yield, within 10 min simply by sonication treatment of an aqueous solution containing K 2 PtCl 4 and ascorbic acid (AA) only. The results in this report de…
Copper(I) sulfide (Cu(2)S) nanodisks with controllable size and aspect ratio have been synthesized by using a one-pot colloidal process, in which no pre-prepared organometallic precursors are required. The reaction involves the injection of dodecanethiol into a hot solution containing copper salt, surfactants, and a h…
BACKGROUND: Serine proteases (SPs) and serine proteases homologs (SPHs) are a large group of proteolytic enzymes, with important roles in a variety of physiological processes, such as cell signalling, defense and development. Genome-wide identification and expression analysis of serine proteases and their homologs in…
We present the comparative preparation of [Co 7 (μ 3 -OH) 6 (L) 6 ](ClO 4 ) 2 ·12H 2 O ( 1 ), [Co 7 (μ 3 -CH 3 O) 6 (L) 6 ](ClO 4 ) 2 ( 2 ), and [Co 7 (μ 3 -N 3 ) 6 (L) 6 ](ClO 4 ) 2 ( 3 ), where HL is 2-methoxy-6-[(methylimino)methyl]phenol, using traditional (e.g., 120 °C, 120 h, 23% yield for 1 ) and microwave-assi…
Core−sheath nanofibers with biodegradable polycaprolactone (PCL) as the core and thermo-responsive poly( N -isopropylacrylamide) (PNIPAAm) as the sheath were prepared by single-spinneret electrospinning of blends of the two polymers. The morphology of the composite fibers with different proportions of PNIPAAm to PCL w…
The richness of optical and electronic properties of graphene attracts enormous interest. Graphene has high mobility and optical transparency, in addition to flexibility, robustness and environmental stability. So far, the main focus has been on fundamental physics and electronic devices. However, we believe its true…
Mean-field theories claim that the capacitance of the double-layer formed at a metal/ionic conductor interface cannot be larger than that of the Helmholtz capacitor, whose width is equal to the radius of an ion. However, in some experiments the apparent width of the double-layer capacitor is substantially smaller. We…
We report a solution-processed, ligand-supported synthesis of 15-20 nm thick Sb(2-x)BixTe3 nanoplatelets. After complete ligand removal by a facile NH3-based etching procedure, the platelets are spark plasma sintered to a p-type nanostructured bulk material with preserved crystal grain sizes. Due to this nanostructure…
Supramolecular glue: The photoinduced isomerization of difunctional azobenzenes can be used to induce and reverse the molecular recognition and adhesion of bilayer vesicles made up of cyclodextrin (CD) molecules. The molecular basis of this light-responsive supramolecular glue is the cis–trans isomerization of the azo…
The hydrolysis of titanium tetrachloride (TiCl(4)) to produce titanium dioxide (TiO(2)) nanoparticles has been studied to provide insight into the mechanism for forming these nanoparticles. We provide calculations of the potential energy surfaces, the thermochemistry of the intermediates, and the reaction paths for th…
The discovery of superconductivity at relatively higher temperatures in a non-cuprate system, LnFeAsO1 − xFx (Ln = lanthanides) has created tremendous activity among the reseachers in this field. This review is an overview on the present status and the future scope for iron pnictides. The various structural categories…
La 2 O 3 is one of the more efficient oxide catalysts for oxidative methane coupling. In this article, we examine the extent to which methane activation can be improved by replacing a La cation in the surface layer with other cations. The purpose of these substitutional dopants is to make the oxygen atoms in their nei…
We calculate the modification of the local electronic structure caused by a single local impurity on the surface of a three-dimensional topological insulator. We find that the local density of states around the Dirac point of the electronic spectrum at the surface is significantly disrupted near the impurity by the cr…
Here, we report the unusual behaviour shown by the (BiFeO3)1-x-(PbTiO3)x (BF-xPT) films prepared using a multilayer deposition approach by chemical solution deposition method. Thin film samples of various compositions were prepared by depositing several bilayers of BF and PT precursors by varying the BF or PT layer th…
We use Monte Carlo simulations to examine the simplest model of an ionic liquid, called the restricted primitive model, at a metal surface. We find that at moderately low temperatures the capacitance of the metal/ionic liquid interface is so large that the effective thickness of the electrostatic double-layer is up to…
We study the excitation spectrum of a topological insulator in contact with an $s$-wave superconductor, starting from a microscopic model, and develop an effective low-energy model for the proximity effect. In the vicinity of the Dirac cone vertex, the effective model describing the states localized at the interface i…