Materials Literature
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Mn-Zn ferrite powders (Mn 0.5 Zn 0.5 Fe 2 O 4 ) were prepared by the chemical co-precipitation method. The effect of sintering temperature on the crystalline phase formation and dielectric properties were investigated by X-ray diffraction and impedance analyzer respectively. The TGA/DTA analysis was carried out to kno…
A theoretical study of the two-dimensional hole gas at the (AgO)−/(TiO2)0 p-type interface in the AgTaO3/SrTiO3 (001) heterostructure is presented. The Ag 4d states strongly hybridize with the O 2p states and contribute to the hole gas. It is demonstrated that the holes are confined to an ultra thin layer (∼4.9Å) with…
In the past years an increased interest to create new polymeric blends with application in the medical area for development of new types of biomaterials has appeared. Electron beam irradiation is well known as a method of producing important changes in polymer structure, being an alternative to chemical synthesis of b…
The colossal magnetoresistance (CMR) effect of manganites is widely believed to be caused by the competition between a ferromagnetic (FM) metallic state induced by the double-exchange mechanism and an insulator with complex spin, charge, and orbital order. Recent computational studies in small clusters have indeed rep…
Phase change materials have become significantly attractive due to its unique characteristics for its extensive applications. In this paper, a kind of phase change material, which consists of Fe and Te components, is developed. The crystallization temperature of the Fe-Te materials is 180 °C for Fe1.19Te and can be ad…
Abstract We report the preparation and characterization of doped polyaniline (PANI) in an ionic liquid 1‐butyl‐3‐methylimidazolium bis [trifluoromethyl(sulfonyl)]imide (BMImTFSI) medium. Aniline monomer was chemically polymerized via oxidation with KMnO 4 in an ionic liquid BMImTFSI solution containing a monoprotic Br…
To explain the fast kinetics of H in porous carbon, we propose that the migration relies on H hopping from a carbon nanotube (CNT) to another. Using density functional theory, we have found that the barrier for H hopping becomes smaller than that for diffusion along a tube for certain CNT separations, decreasing to le…
A layered superconductor with a full pairing energy gap can be driven into a nodal superconducting (SC) state by interlayer pairing when the SC state becomes more quasi-three-dimensional. We propose that this mechanism is responsible for the observed nodal behavior in a class of iron-based SCs. We show that the intra-…
This chapter discusses thermoelectric properties of individual quintuples and stacks of the graphene-like exfoliated single-crystal quasi-two-dimensional Bi 2 Te 3 films. It shows that ZT in such “pseudo-superlattices” of the stacked films can be substantially increased via reduction of the in-plane and cross-plane th…
We have studied the dehydroxylation reaction in a smectite model, with the purpose of determining the influence of the octahedral layer composition and the possible role of the interlayer cations. Employing ab initio molecular dynamics and with the help of metadynamics for accelerating the reaction, we study the two p…
Nearly monodisperse spherical magnetite (Fe3O4) nanoparticles are prepared by colloidal chemistry route. Magnetic and electronic transport properties of the annealed pellets of these nanoparticles are reported. Effect of external magnetic and electric fields on the magnetic and transport properties of the material are…
Nanocomposites consisting of one-dimensional (1D) crystals of the cationic conductors CuI, CuBr and AgBr inside single-walled carbon nanotubes, mainly (n, 0), were obtained using the capillary technique. 1D crystal structure models were proposed based on the high resolution transmission electron microscopy performed o…
Glass-ceramics (GC) consisting of nano-sized Nb-dielectrics were fabricated in BaO–Na2O–P2O5–Nb2O5 system, and their crystallization and physical features were studied. Precursor of 0.67(2BaO–0.5Na2O)–1P2O5–2.5Nb2O5 glass co-crystallized Ba2NaNb5O15 (BNN) and NaNbO3 phases, which are about 10 nm in size, and resulting…
Atomically thin free-standing nanomembranes belong to the emerging class of materials with a great promise for basic research of two-dimensional (2D) systems and applications in nanotechnology. However, their synthesis and characterization remain a frontier challenge in chemical and physical research. Here, we demonst…
A new Ni-BaCe 0.4 Zr 0.4 Nd 0.2 O 3-δ （Ni-BZCN4）cermet membrane was used to separate hydrogen from mixed gas containing hydrogen. Hydrogen permeation properties of the membrane were investigated under various conditions. Hydrogen permeation flux increases with temperature. When the feed gas was moistened by 3% H 2 O,…
In this paper, it was investigated the changes of structure of sepiolites under different conditions of acid treatments and heat treatments using fourier transform infrared spectroscopy(FTIR). At the same time, through the tannin adsorption experiments, it was studied the changes adsorption properties of sepiolites by…
For the large number of waste cotton/hemp blend fiber, the molding technology of manufacturing waste blend composites was designed and optimized by mixed hot pressing in this paper, and the mechanical properties of composites were analyzed. Through the orthogonal experiment, the optimum conditions were given as follow…
In this paper, a study on the electrochemical behaviour and electrical properties of Al-Zn and Al-Zn-Sn alloys in tropical seawater using open circuit potential (OCP) measurement and electrochemical impedance spectroscopy (EIS) are reported. The results from both the OCP and EIS tests show that surface activation was…
In this work, the treatment of epitaxial graphene on SiC using electron beam generated plasmas produced in mixtures of argon and oxygen is demonstrated. The treatment imparts oxygen functional groups on the surface with concentrations ranging up to about 12 at.%, depending on treatment parameters. Surface characteriza…
This paper investigates the effect of silicon carbide (SiC) thin film as a stabilizing layer on porous silicon (PS) in metal–semiconductor–metal (MSM) photodiodes. Photo-assisted pulsed electrochemical etching method was used to produce the PS layers with large pore density and small crystallite size. As–prepared PS s…