Materials Literature
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The stable tubelike Au(N) (N=26-28) has been found using the scalar relativistic all-electron density functional theory calculations, which becomes another powerful candidate for the lowest-energy Au(N), competing in energy with those space-filled structures suggested previously. Unlike the icosahedral "golden" fuller…
We have incorporated fluorescent quantum dots (QDs) into polystyrene microspheres using functionalized oligomeric phosphine (OP) ligands. We find that a uniform distribution of quantum dots is loaded inside each polymer bead. Some local close-packing of quantum dots in the beads is attributed to the self-polymerizatio…
Au(III)-Schiff base complexes are active hydrogenation catalysts, giving turnover frequencies similar to those of the corresponding complexes of Pd(II), which has the same d8 electronic structure as Au(III). The mechanism of the reaction has been studied in detail by a combination of kinetic experiments and theoretica…
Supramolecular gels and liquid-crystalline materials containing borondipyrromethene (F-Bodipy) are a new class of highly luminescent materials built by attachment of long-chain alkoxydiacylamido scaffoldings to boradiazaindacene templates. Robust gels were formed in nonane, and luminescence spectroscopy was used to pr…
A numerical model for describing bipolar charge transport and storage in polyethylene has been developed recently. The present paper proposes a comparison of the model outputs with experimental data in three different direct current (DC) voltage application protocols (step field increase and polarization/depolarizatio…
Magnetic multiwalled carbon nanotubes (MWNTs) were facilely prepared by the electrostatic self-assembly approach. Poly(2-diethylaminoethyl methacrylate) (PDEAEMA) was covalently grafted onto the surfaces of MWNTs by MWNT-initiated in situ atom transfer radical polymerization (ATRP) of 2-diethylaminoethyl methacrylate…
Surface wave propagation at the interface between different types of gyrotropic materials and an isotropic negatively refracting medium, in which the relative permittivity and relative permeability are, simultaneously, negative is investigated. A general approach is taken that embraces both gyroelectric and gyromagnet…
We study numerically the existence and character of bound states for positive and negative point charges shielded by the response of a two-dimensional homogeneous electron gas. The problem is related to many physical situations and has recently arisen in experiments for impurities on metal surfaces with Schockley surf…
The effect of microscopic Mn cluster distribution on the Curie temperature (TC) of (Ga,Mn)N is studied using density-functional calculations together with the mean field approximation. We find that the calculated TC depends crucially on the microscopic cluster distribution, which can explain the abnormally large varia…
Making films: Removal of most of the toluene from a two-phase toluene/water mixture causes nanoparticles present at the liquid–liquid interface to pack closely together in an ordered monolayer film (MLF). This MLF can be removed from the interface for further study.
We report a first-principles investigation of ultrathin BaTiO(3) films with SrRuO(3) electrodes. We find that the ionic relaxations in the metal-oxide electrode play a crucial role in stabilizing the ferroelectric phase. Comparison with frozen-phonon calculations shows that the degree of softness of the SrRuO(3) latti…
Manganese oxides ( R , A )MnO 3 ( R = La, Y, Bi or rare earth metal, A = non-trivalent doping element) have been one focus of research for two outstanding properties: (i) conduction electrons (if any) are highly spin-polarized and (ii) competing interactions of several electronic and lattice degrees of freedom lead to…
Imaging with subwavelength resolution using a periodic metal-dielectric layered structure is demonstrated. The structure operates in canalization regime as a transmission device and it does not involve negative refraction and amplification of evanescent modes. The thickness of the structure has to be an integer number…
Galfenol (Fe100-xGax, x = 6, 12.5, 17, 18.4, 19, 22) and Alfenol (Fe81Al19) alloy rods (~50 mm x 6 mm dia.) were annealed under compressive stresses up to 219 MPa at temperatures from 100°C to 700°C for 10 to 100 minutes. Because of the magnetostriction of the alloys, these heat treatments build in a uniaxial magnetic…
Highly aligned multi-wall carbon nanotube arrays up to 4 mm tall were synthesized on Si wafers using a chemical vapor deposition process with water delivery. Based on the long nanotube arrays, several prototype smart materials were developed including a biosensor, electrochemical actuator, and nanotube probes. The bio…
The use of Shape Memory Alloys (SMAs) is growing rapidly. They have been under serious development for aerospace applications for over 15 years, but are still restricted to niche areas and small scale applications. Very few applications have found their way into service. Whilst they have been predominantly aimed at ai…
The crystal morphology of silver laurate, silver stearate, and silver behenate is studied. The crystal structures form a homologous series for AgOOC n H 2 n - 1 (for n = even). These crystals are morphologically only isomorphous when grown at low supersaturation. The morphological importance of the top facets depends…
Abstract The crystal structures and spectroscopic (IR, Raman, UV/Vis) data for the complexes [C(NH 2 ) 3 ] 2 [Nd(HTTHA)] · 3H 2 O ( I ) and [C(NH 2 ) 3 ] 3 [Nd(TTHA)] · 6H 2 O ( II ) are presented. Crystals of I are triclinic, P $\bar {1}$ , a = 9.998(2), b = 10.730(2), c = 15.557(3) Å, α = 106.89(3)°, β = 90.27(3)°,…
Natural fiber-reinforced composites are currently used for various types of applications. However, to improve the fiber/resin bonding at the interface, some suitable chemical modification of the fibers is required. In the present study, an attempt has been made to use an inexpensive, easily available, and water-solubl…
We hereby report hydrothermal syntheses of new microstructures of semiconducting ZnO. Single-crystalline prismatic ZnO microboxes formed by nanowalls and hexagonal hollow microdisks closed by plates with micron-sized inorganic fullerene-like structures have been made in a base-free medium through a one-step hydrotherm…