Materials Literature
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A ceramic sample of a layered cuprate of Tl 2 Ba 2 Ca 2 Cu 3 O x and Tl 2 Ba 2 Ca 1 Cu 2 O x , so-called Tl-based 2223 and 2212 compounds, was investigated by the measurement of the dielectric constants (ε′ and ε′′), the dielectric loss (tanδ), and the conductivity (σ ac ) as a function of temperature (80–300 K) and f…
Fusion of the structural motifs 21,23-dithiaporphyrin and acetylene yields the 18-π-aromatic [18]triphyrin(4.1.1) framework (see structure; C gray, N blue, S yellow). The butyne moiety that joins the two thiophene rings reveals a slight distortion from linearity, showing a bowlike deformation directed out of the macro…
A Monte Carlo study is carried out to quantify the effects of seed anisotropy and interseed attenuation for 103Pd and 125I prostate implants. Two idealized and two real prostate implants are considered. Full Monte Carlo simulation (FMCS) of implants (seeds are physically and simultaneously simulated) is compared with…
Down to the wire: A new class of 1D chain, [-Pt-Rh-Pt4-Rh-Pt-Cl-]n, composed of Pt–Pt and Pt–Rh dimeric complexes linked through metal–metal bonds has been prepared (see structure). This chain of mixed-valent metals (PtII/PtIII and RhII/RhIII) contains one unpaired electron in each octameric segment, leading to unique…
It is shown that CaCu3Ti4O12 grains in a polycrystalline specimen have domains and comparatively thick domain walls. The orientations of the domains within a grain were observed to be slightly tilted toward each other, suggesting the presence of lattice distortions. Multiple reflection spots in the electron diffractio…
Abstract Phosphomolybdic acid/polyvinylpyrrolidone hybrid films were found to show visible light photochromism. It is identified that the intra‐supramolecular charge transfer between the inorganic and organic molecules is responsible for the visible‐light coloration. Interestingly, the films show photo‐memory and ther…
This paper reviews the syntheses, particle-size measurements and various aspects of the optical spectra of lanthanide ion doped insulating nanomaterials, with the focus upon the sesquioxides, and it contrasts their behaviour with bulk materials.
The William B Morgan Large Cavitation Channel (LCC) is a large variable-pressure closed-loop water tunnel that has been operated by the US Navy in Memphis, TN, USA, since 1991. This facility is well designed for a wide variety of hydrodynamic and hydroacoustic tests. Its overall size and capabilities allow test-model…
Abstract Following an earlier study of the uncertainties for defining thicknesses by angle‐resolved XPS, one of the major instrumental uncertainties has been evaluated that limits both precision and accuracy. For analysis of the thicknesses of SiO 2 on Si, certain angles of emission have been recommended, but an error…
We report inelastic neutron scattering measurements on polystyrene thin films in a glassy state in the meV region. We found in elastic scattering that the mean square displacement <u2> decreased with film thickness, and hence the corresponding force constant f increased. In inelastic and quasielastic scattering, we ob…
The relationships between the structural features and mechanical properties of electrospun segmented polyurethane (SPU) meshes and electrospinning parameters such as formulation (e.g., polymer concentration and solvent mixing ratio) and operation parameters (e.g., applied voltage, air gap, and flow rate) were studied…
The development and properties of doped nanomaterials including doped titanium dioxide, doped silicon, and doped cadmium telluride are reviewed, as well as their ultrafast dynamics. Doping nanomaterials provides a flexible way to tune to the properties of the materials while maintaining their high surface areas. The e…
Abstract A simple, one‐step synthetic route to prepare ordered mesoporous silica monoliths with controllable quantities of metal oxide nanocrystals in their channels is presented. The method is based on the assisted assembly effect for mesostructure‐directing of the metal complexes formed by the interaction of metal i…
Abstract Copper nanocrystals with plate‐like morphologies and face‐centered cubic (fcc) structures have been synthesized in mixed reverse micelles with a large excess of reducing agent. High‐resolution transmission electron microscopy images and image simulations show the presence of multiple twin defects parallel to…
Abstract Preparation of coaxial (core–shell) CdS–ZnS and Cd 1– x Zn x S–ZnS nanowires has been achieved via a one‐step metal–organic chemical vapor deposition (MOCVD) process with co‐fed single‐source precursors of CdS and ZnS. Single‐source precursors of CdS and ZnS of sufficient reactivity difference were prepared a…
Abstract Hydrothermally stable thioether‐bridged mesoporous materials have been synthesized by one‐step co‐condensation of 1,4‐bis(triethoxysily)propane tetrasulfide (TESPTS) with tetramethoxysilane (TMOS) using cetyltrimethylammonimum bromide (CTAB) as the surfactant in basic conditions. The ordered mesoporous materi…
Filling in the gaps of activated carbon by chemical vapor decomposition of ethylene results in hierarchically structured carbon with carbon nanofibers (CNFs) nested inside and immobilized on the surface (see picture). The adsorption experiments show that this nanostructuring of carbon creates novel functions on the su…
This study explores the origin of the native donor in undoped In2O3. The electronic structure of various point defects in In2O3 clusters is studied using the first-principles molecular orbital calculation. The results show that an oxygen vacancy cannot act as a native donor, because the defect level formed is much low…
We report the results of magnetization, zero-field resistivity, and magnetoresistance measurements in the ferromagnetic Heusler alloy ${\mathrm{Co}}_{2}\mathrm{TiSn}$. There is a striking change in the character of electron transport as the system undergoes the paramagnetic to ferromagnetic transition. In the paramagn…
Abstract The Archimedean tiling (3 2 .4.3.4) is a regular but complex polygonal assembly of equilateral triangles and squares. This tiling pattern with mesoscopic repeating distance has been found for an ABC star‐branched three‐component polymer composed of polyisoprene, polystyrene, and poly(2‐vinylpyridine). In this…