Materials Literature
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The calculated optical effective masses of electrons, both orthogonal and parallel to the tetragonal axis of the crystal, are reported as a function of carrier concentration in Nb-doped anatase. The calculation is based on the band structure, obtained by density functional theory in the generalized gradient approximat…
The shear mechanical compliance of the glass−rubber transition or softening zone of high molecular weight amorphous polymers typically increases from the glassy compliance of ∼10 −10 cm 2 /dyn up to the rubbery plateau of ∼10 −6 cm 2 /dyn. The contributions from the local segmental relaxation and the Rouse modes canno…
Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) cathodes are prepared on NiO-yttria-stabilized zirconia (YSZ)/YSZ composite substrates using pulsed laser deposition (PLD) and the screen-printing method. The cathode by PLD outperforms that by screen-printing, with an enhancement of over 150% in the maximum power, which can be attribut…
Noscapine, the tubulin-binding anticancer agent, when administered orally, requires high ED(50) (300-600 mg/kg), whereas intravenous administration (10 mg/kg) results in rapid elimination of the drug with a half-life of 0.39 h. Hence, the development of long-circulating injectable nanoparticles can be an interesting o…
The time dynamics of the photoexcited carriers and carrier-multiplication efficiencies in PbS quantum dots (QDs) are investigated. In particular, we report on the carrier dynamics, including carrier multiplication, as a function of QD size and compare them to the bulk value. We show that the intraband 1$P$\ensuremath{…
Abstract Ultrathin β‐MnOOH nanofibers can be produced on a large scale via a green‐chemical method using an aqueous solution of very dilute Mn(NO 3 ) 2 and aminoethanol at room temperature. High‐magnification electron microscopy demonstrates that the β‐MnOOH nanofibers are 3–5 nm thin and up to 1 micrometer long and t…
In this study, advanced control of crystallographic orientations and magnetic properties of self-assembled nanostructures via rational selections of substrates is demonstrated. We show that in the perovskite-spinel BiFeO(3)-CoFe(2)O(4) model system the crystal orientation of self-assembled CoFe(2)O(4) nanopillars can…
Tb-doped ceria materials have been synthesized by the coprecipitation method. Cobalt oxide (2 mol %) has been added in order to improve the sinterability and conductivity. XRD measurements suggest that a part of the cobalt is incorporated in the ceria lattice. Ce 1− x Tb x O 2−δ materials showed predominantly ionic co…
The thermal conductivity of individual single-crystalline Bi nanowires grown by the on-film formation of nanowires (ON-OFF) has been investigated. We observed that the thermal conductivity of single-crystalline Bi nanowires is highly anisotropic. Thermal conductivity of nanowires (diameter ∼100 nm) in the off-axis [10…
High-speed and high-resolution photography have been used to investigate the relationship between creation, expansion, and collapse of a vapor cavity induced by a 6 ns laser pulse and the subsequent nucleation of crystals. A thin layer of supersaturated aqueous solutions of (NH 4 ) 2 SO 4 and KMnO 4 was confined betwe…
We investigate the role of substrates on the collective excitations of graphene by using a first-principles implementation of the density response function within the random-phase approximation. Specifically, we consider graphene adsorbed on SiC(0001) and Al(111) as representative examples of a semiconducting and meta…
Dispersive SnS2 colloidal quantum dots have been synthesized via hot-injection method. Hybrid photovoltaic devices based on blends of a conjugated polymer poly[2-methoxy-5-(3",7"dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) as electron donor and crystalline SnS2 quantum dots as electron acceptor have been studie…
This paper investigates the role of salt in the spontaneous linear assembly of charged gold nanoparticles in ethanol and attempts to clear up a misunderstanding on the role of ethanol in this process. Many prior reports have noted that the addition of ethanol to an aqueous solution of gold nanoparticles causes their a…
Using two living nickel α-diimine complexes ( rac - 1 and rac - 4 ) activated with methylaluminoxane (MAO), isotactic polypropylene ( i PP) samples containing five types of regiodefects were synthesized. Both isolated and successive groups of (2,1) and (3,1) enchainments were identified by solution-state 13 C NMR spec…
Folded graphene flakes are a natural byproduct of the micromechanical exfoliation process. In this article we show by a combination of analytical and numerical methods that such systems behave as intriguing interferometers due to the interplay between an externally applied magnetic field and the gauge field induced by…
The use of self-assembly for the construction of materials based on phthalocyanines and carbon nanostructures-fullerenes, single-walled carbon nanotubes, and graphene-has demonstrated to be a versatile strategy for the preparation of novel, multifunctional systems. Photophysical studies carried out on these photo- and…
The epitaxial growth of graphene by chemical vapor deposition of ethylene on a Ru(0001) surface was monitored by high-temperature scanning tunneling microscopy. The in situ data show that at low pressures and high temperatures the metal surface facets into large terraces, leading to much better ordered graphene layers…
One of the bottlenecks in the implementation of a hydrogen economy is the development of storage materials that can uptake high content of H 2 and release it within a suitable temperature and pressure range. Among the proposed hydride systems, the perovskite NaMgH 3 is receiving increasing attention, not only as the M…
The state-of-the-art record of thermoelectric figure-of-merit (ZT) of 1.53 at 425 °C is achieved by chlorine doping in In4Se3–xCl0.03 bulk crystalline materials as used for n-type thermoelectric energy harvesting. The low-dimensional property imparted by chlorine doping significantly increases the electrical conducti…
Drop casting of highly concentrated solutions of nanorods in high boiling point solvents, followed by slow solvent evaporation, leads to the formation of crack-free multilayers of vertically aligned rods in square centimeter areas.