Materials Literature
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We investigate the electrical properties of Sm-doped Bi 4− x Sm x Ti 3 O 12 (BST) ceramics prepared by a conventional electroceramic technique. The x-ray diffraction analysis reveals the Bi-layered perovskite structure in all samples. The SEM micrographs show randomly oriented and plate-like morphology. For the sample…
A study of the inter-relationship between moisture, vanadia content, operation temperature, and surface acidity for a selective catalytic reduction (SCR) process for nitric oxide (NO) removal was conducted. The effects of operating parameters on the roles of Brønsted and Lewis acids acting in the SCR reaction were spe…
The hydrothermal reaction of (NH(4))(6)Mo(7)O(24).4H(2)O, CuCl(2).2H(2)O, and 4,4'-bipyridine yields bipyridine-ligated copper-trimolybdate monohydrate [Cu(4,4'-bipy)(H(2)O)(Mo(3)O(10))].H(2)O in the monoclinic system with space group of C(2/c) and cell parameters of a = 15.335(2) A, b = 15.535(2) A, c = 15.106(2) A,…
Polymer sheets (see Figure) with nanometer-scale thicknesses, micrometer-scale lateral dimensions, and interesting materials properties that could be exploited in applications such as polymeric nanoactuators, biomimetic systems, and drug delivery vehicles have been fabricated via a new approach. The method employs cro…
Typical relaxorlike dielectric properties, such as broad dispersive dielectric maximum, Vogel–Fulcher temperature dependence of the characteristic relaxation frequency, and paraelectric-to-glass crossover in the temperature dependence of the dielectric nonlinearity, have been detected in the derived lead-free K0.5Na0.…
The magnetic and structural properties of InAs:Mn self-organized diluted magnetic quantum dots grown by low-temperature (∼270°C), solid-source molecular-beam epitaxy using a very low InAs growth rate (<0.1ML∕s) are investigated. A Curie temperature (TC) of ∼350K is measured in a sample grown with a Mn∕In flux r…
A new streptocyanine dye has been doped into monolithic silica gels with different porosities, characterized by nitrogen adsorption isotherms. Single-molecule tracking with a wide-field fluorescence microscope is used to determine the diffusivity of the dye in the nanoporous network of the host. The majority of molecu…
Different versions of a thermoelectric unicouple composed of p-type Ca2.7Bi0.3Co4O9 (Co-349) and n-type La0.9Bi0.1NiO3 (Ni-113) bulks were constructed using Ag paste containing p- and n-type oxide powders, prepared from the same bulks, for connection of the p and n legs, respectively. Internal resistance (RI) of the u…
A higher-order nanostructured polysiloxane was prepared by the sol−gel reaction of 3-aminopropyltrimethoxysilane catalyzed by a strong acid such as hydrochloric acid or nitric acid. In the X-ray diffraction (XRD) profiles, this compound had three peaks: one prominent peak and two minor peaks. The d -value ratios of th…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(N-isopropylacrylamide)-Coated Carbon Nanotubes: Temperature-Sensitive Molecular Nanohybrids in WaterHao Kong, Wenwen Li, Chao Gao, Deyue Yan, Yizheng Jin, David R. M. Walton, and Harold W. KrotoView Author Information College o…
The amorphization mechanism of icosahedral Pt nanoclusters is investigated by a combination of molecular dynamics simulations and density functional calculations. A general mechanism for amorphization, involving rosettelike structural transformations at fivefold vertices, is proposed. In the rosette, a fivefold vertex…
Thin films of the Mn+1AXn-phases Ti2AlC and Ti3AlC2 have been deposited by dc magnetron sputtering. In agreement with the Ti–Si–C system, the MAX-phase nucleation is strongly temperature dependent. At 900°C epitaxial films of Ti2AlC and Ti3AlC2 were grown, but at 700°C only a cubic (Ti,Al)C phase was formed. In additi…
Diluted magnetic semiconductor Zn1−xCoxO nanorods with a Curie temperature higher than 350K have been synthesized by in situ doping of Co in ZnO nanorods using a simple thermal chemical vapor deposition method. Structural analyses indicated that the nanorod possesses the single-crystalline wurtzite structure and there…
We report a unique way of using mechanical milling/in situ consolidation at both liquid-nitrogen and room temperature to produce artifact-free nanocrystalline Cu(23nm) with a narrow grain size distribution. This nanocrystalline Cu exhibits an extraordinarily high yield strength (770MPa), as predicted from a Hall–Petch…
Electromagnetic energy transport in chains of noncontacting metal nanoparticles is studied within an exactly solvable model. The transport is mediated by the retarded electromagnetic interactions between plasmons confined to the individual nanoparticles and therefore self-consistently accounts for spontaneous emission…
The surface and electronic structure of MOCVD-grown layers of Ga(0.92)In(0.08)N have been investigated by means of photoemission. An additional feature at the valence band edge, which can be ascribed to the presence of In in the layer, has been revealed. A clean (0001)-(1x1) surface was prepared by argon ion sputterin…
The effect of plasma irradiation is studied systematically on a 4H polytype (002) oriented ${\rm CdI_2}$ stoichiometric film having compressive residual stress. Plasma irradiation was found to change the orientation to (110) of the film at certain moderate irradiation distances. A linear decrease in grain size and res…
The turn-over frequency of the catalytic oxidation of CO at RuO2(110) was calculated as function of temperature and partial pressures using ab initio statistical mechanics. The underlying energetics of the gas-phase molecules, dissociation, adsorption, surface diffusion, surface chemical reactions, and desorption were…
Complex electrical permittivity measurements in (1−x)[Pb(Mg1∕3Nb2∕3)O3]–xPbTiO3 ceramics for 0.10⩽x⩽0.40 were performed in the frequency and temperature range from 1to100kHz and from 15to600K, respectively. Unexpected dielectric anomalies, which were frequency dependent, were found at cryogenic temperatures. It was ve…
First-principles calculations of the mayenite-based oxide, [Ca12Al14O32]2+(2e−), reveal the mechanism responsible for its high conductivity. A detailed comparison of the electronic and optical properties of this material with those of the recently discovered transparent conducting oxide, H-doped UV-activated Ca12Al14O…