Materials Literature
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In this paper we present the results of the synthesis and characterisation of nanocrystalline La1-xNaxMnO3+delta samples. Two synthetic routes were employed: polyacrylamide-based sol-gel and propellant synthesis. Pure, single phase materials were obtained with grain size around 35 nm for the sol-gel samples and around…
Silver−silica composite particles with a core−shell structure were been obtained. The thickness of the silver nanoshell could be easily tailored by varying the number of deposition cycles. The method for fabricating such particles was based on a seed-mediated growth technique, where metal silver nanoparticles tethered…
In this paper we have applied the full-potential linearized muffin tin orbital method and the tight-binding linearized muffin tin orbital method to investigate in detail the electronic structure and magnetism of a series of half-Heusler compounds XMZ with X = Fe,Co,Ni, M = Ti,V,Nb,Zr,Cr,Mo,Mn and Z = Sb,Sn. Our detail…
Polymers incorporating the triptycene subunit were prepared for the molecular-level design of low dielectric constant (low-kappa) materials that can be used to manufacture faster integrated circuits. Triptycenes having restricted rotation by multiple point attachment to the polymer backbone are shown to introduce free…
We report the design, fabrication and performance of the 5 x 2 pixel uncooled microbolometer array. The test microbolometer utilizes pulsed laser deposited vanadium oxide film at room temperature as the IR sensitive layer. The microbolometer was fabricated without air-gap thermal isolation structure and the pixel area…
Disconnected free surfaces (or interfaces) of a connected liquid volume (or liquid volumes) occur when the boundary of the liquid volume consists of two or more separate surface components Γi (i=1,…,m) that correspond to liquid–gas (or liquid–liquid) interfaces. We consider disconnected surfaces for which each compone…
In this paper, we report the in-plane and cross-plane measurements of the thermal diffusivity of double epitaxial layers of $n$-type GaAs doped with various concentrations of Si and a $p$-type Be-doped GaAs layer grown on a GaAs substrate by the molecular beam epitaxial method, using the laser-induced nondestructive p…
We have investigated the electric-field effect on the orbital-ordered state of eg electrons for layered manganites Nd1−xSr1+xMnO4 near the phase boundary between antiferro d3x2−r2/d3y2−r2 and ferro d3x2−r2 orbital-ordered phases. By means of a polarization microscope in crossed-Nicol configuration, we can distinguish…
Through mechanoelastic, thermal expansion, and dielectric measurements as a function of the temperature on ceramics of BiMoxW1−xO6 (x=0, 0.10, and 0.25) solid solutions, anomalies in the corresponding parameters are found below the ferroparaelectric phase transition temperature. One of these anomalies, that correspond…
Recent advances in the design of fast field cycling (FFC) relaxometers make it now possible to explore the nuclear magnetic relaxation dispersion (NMRD) of semidilute nuclei with short relaxation times. The paramagnetic relaxation rate enhancement of the protons of the tetramethylammonium (CH3)4N+ cation due to the in…
Cu interconnect technology requires the use of <5-nm-thick interfacial layers to inhibit Cu transport into adjacent dielectric layers. We demonstrate the use of 3.5-nm-thick polyelectrolyte layers comprising polyethyleneimine (PEI) and polyacrylic acid (PAA) for this application. Cu/PAA/PEI/SiO2/Si structures s…
A new aerosol‐assisted surfactant self‐assembly approach has been developed for large‐scale mesostructured silica thin film fabrication. The formation mechanism involves coalescence of semisolid surfactant–silica mesostructured particles on substrates (see Figure) and subsequent reassembly of the mesostructures to ada…
In this work the static electric properties of azo-enaminones, with special emphasis to the vector component of the first hyperpolarizability βvec, are determined at the Hartree–Fock (HF) level with the electron correlation (EC) effects included through the second-order Møller–Plesset perturbation theory (MP2). The ab…
A simple model of harmonic vibrations in topologically disordered systems, such as glasses and supercooled liquids, is studied analytically by extending Euclidean random matrix theory to include vector vibrations. Rather generally, it is found that (i) the dynamic structure factor shows soundlike Brillouin peaks whose…
We established the number of Si 2p photoelectrons emanating from a Si(100) substrate covered with a silicon–oxide film as a function of azimuthal and polar angles using the oxide film thickness as a parameter. The elastic and inelastic scattering cross sections of Si 2p photoelectrons in silicon oxide were deduced by…
A molecular‐scale interface , consisting of a “fused” heterojunction between a nanotube and a quantum dot, has been prepared. This work is significant for the construction of functional hierarchical assemblies with unique properties. The Figure shows a schematic representation of a CdTe quantum dot grown directly onto…
Open-tipped carbon nanotubes with a large amount of subnanopores and open ends on the tube wall were conveniently prepared by an improved anodized aluminum oxide template growth. The hydrogen storage was measured based on a volumetric method. Adsorptions of 6.46 and 1.12 wt % were achieved at 77 K and room temperature…
The Hamiltonian of wurtzite quantum rods with an ellipsoidal boundary under electric field is given after a coordinate transformation. The electronic structure and optical properties are studied in the framework of the effective-mass envelope-function theory. The quantum-confined Stark effect is illustrated by studyin…
We use theory and experiment to demonstrate that a composite material, consisting of a metallic planar fractal and a metal sheet separated by a thin dielectric layer, can reflect electromagnetic wave in-phase at a series of frequencies, with some of the corresponding wavelengths much longer than the reflector’s own si…
This study performs O K- and Ti L3,2-edge x-ray absorption near-edge structure (XANES) measurements and first-principles pseudopotential calculations for the electronic structures of ABO3-type Pb1−xCaxTiO3 (x=0–1) perovskites. The features in the O K-edge XANES spectra are found to be contributed primarily by hybridiz…