Materials Literature
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We have studied Bi-2212 microcrystals aged at ambient conditions for 40 days. Combined x-ray absorption near edge structure and x-ray fluorescence measurements with micrometer space resolution show both an increase of Cu$^{+}$ with respect to Cu$^{2+}$ and an enrichment in Cu vs Bi and Sr cation content near the sampl…
We describe how density-functional theory, well-known for its many uses in ab initio calculations of electronic structure, can be used to study the ground state of inhomogeneous model Hamiltonians. The basic ideas and concepts are discussed for the particular case of the Heisenberg model. As representative application…
Numerical simulations of bubble oscillations in liquid water irradiated by an ultrasonic wave are performed under the experimental condition for single-bubble sonochemistry reported by Didenko and Suslick [Nature (London) 418, 394 (2002)]. The calculated number of OH radicals dissolving into the surrounding liquid fro…
The self-interaction error in density-functional theory leads to artificial stabilization of delocalized states, most evident in systems with an odd number of electrons. Clear examples are dissociations of carbocation radicals that often give delocalized states at long distances and large errors in computed binding en…
We study the frequency dependence of the effective electromagnetic parameters of left-handed and related metamaterials of the split ring resonator and wire type. We show that the reduced translational symmetry (periodic structure) inherent to these metamaterials influences their effective electromagnetic response. To…
We employ a molecular statics approach based on embedded-atom-method interatomic potentials to study the elasticity of copper nanowires along [001], [110], and [111] crystallographic directions. Self-consistent comparison with the bulk response clearly shows that the overall nanowire elasticity is primarily due to non…
We recently presented a novel class of self-assembled diphenylalanine-based peptide nanotubes. Here, for the first time, we present their mechanical properties, which we directly measured through indentation type experiments using atomic force microscopy. We find that the averaged point stiffness of the nanotubes is 1…
“Hedgehog” or “nest” microspheres of V2O5 are formed when nanorods of V2O5 are synthesized in a mediated polyol process. When the concentration of the starting material is low, a nest shape is preferred, whereas a high concentration of [V(acac)3] affords hedgehog-shaped microspheres (see picture). The V2O5 microsphere…
This Minireview systematically examines optical properties of silver nanoparticles as a function of size. Extinction, scattering, and absorption cross-sections and distance dependence of the local electromagnetic field, as well as the quadrupolar coupling of 2D assemblies of such particles are experimentally measured…
The interactions leading to crystallization of calcium- and integrin-binding protein (CIB), a novel Ca 2+ binding protein, were characterized in terms of osmotic second virial coefficients, B 22, measured by self-interaction chromatography. In particular, the role of additives such as alkanediols or DMSO in improving…
Cathodic protection system (CPS) is used to reduce corrosion by minimizing the difference in potential between anode and cathode. This can be achieved by applying a current to the structure to be protected from electrical source. When enough current is applied, the whole structure will be at one potential, thus anode…
Syndiotactic propylene–ethylene copolymers show entropic or enthalpic elasticity depending on ethylene concentration (see Figure). Enthalpic elasticity is due to a reversible transition between transplanar and helical polymorphic forms during stretching, and allows maintenance of elasticity even for highly crystalline…
ADVERTISEMENT RETURN TO ISSUEPREVReportNEXTSolid Support for High-Throughput Screening of Conducting PolymersDiego F. Acevedo, María C. Miras, and César A. BarberoView Author Information Departamento de Química, Universidad Nacional de Río Cuarto, 5800-Río Cuarto, Argentina Cite this: J. Comb. Chem. 2005, 7, 4, 513–51…
The door to a new class of materials has been opened through the combination of aerogels and semiconductor nanocrystals. Semiconductor nanoparticles are used as building blocks to give dry, mesoporous aerogels with large internal surface areas (see picture, center: wet CdS gel; left: unwashed CdS aerogel; right: monol…
Abstract Polymerisation of trimethylene carbonate (TMC) and its copolymerisation with L ‐lactide (LA) using the SmI 2 /Sm initiator system is reported. The reactions were carried out at different temperatures to optimize the reaction conditions. Reactivity ratio values evaluated using the Kelen–Tüdos method were 7.24…
Magnetoresistive La0.67Sr0.33MnO3 nanowires (NWs) have been synthesized using pulsed-laser deposition, with a template of MgO NWs. Transport studies reveal a remarkable metal–insulator transition at 325 K, accompanied by room-temperature colossal magnetoresistance (MR) of ∼ 10 % under a 1 T magnetic field. Shape-induc…
We report the observation of Er3+ fluorescence in an optically transparent CaF2:Er3+ perfluorocyclobutyl-based fluoropolymer composite. Under 980 nm excitation, fluorescence was observed at 1560 nm with a bandwidth of 93 nm. A quantitative analysis of the radiative properties yielded a radiative quantum efficiency of…
The pressure-dependence of the zero-field splitting of the S=10 ground state of the single-molecule magnet Mn12-acetate was studied by inelastic neutron scattering (INS) at hydrostatic pressures up to 12 kbar (see picture). The anisotropy increases with increasing pressure, and a pressure-dependent minority species of…
Die Kombination von Aerogelen und Halbleiter-Nanokristallen eröffnet den Zugang zu einer neuen Materialklasse. Dabei werden Halbleiter-Nanoteilchen als Bausteine eingesetzt, um trockene und mesoporöse Aerogele mit großer innerer Oberfläche zu erhalten (Bild: feuchtes CdS-Gel (Mitte), ungewaschenes CdS-Xerogel (links)…
Abstract The mechanical, morphological and thermal properties of the binary and ternary blends of a fluorocarbon elastomer (FKM), an acrylic elastomer (ACM) and a liquid crystalline polymer (LCP) were investigated. The ternary blends were prepared by varying the amount of the LCP but fixing the ratio of the FKM and AC…