Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The Harman method for measuring the thermal conductivity of a sample using the Peltier effect, may also be used to determine the dimensionless figure of merit from just two electrical resistance measurements. We consider a modified version of the Harman method where the current contacts are much smaller than the conta…
As nanoparticle synthesis capabilities advance, there is an increasing need for reliable nanoparticle size distribution analysis. Transmission electron microscopy (TEM) can be used to directly image nanoparticles at scales approaching a single atom. However, the advantage gained by being able to "see" these nanopartic…
The thermal and dynamic behavior of epoxy nanocomposites with varying cross-link density was tested via dynamic scanning calorimetry (DSC) in order to determine the influence of cross-link density on the creation of “interphase”, zones of altered polymer properties near polymer−particle interfaces. The results show th…
We investigated the modulation of optical properties of single-walled carbon nanotubes (SWCNTs) by AuCl 3 doping. The van Hove singularity transitions (E 11 (S), E 22 (S), E 11 (M)) in absorption spectroscopy disappeared gradually with an increasing doping concentration and a new peak appeared at a high doping concent…
We compute the electron-phonon coupling (EPC) of selected phonon modes in graphene and graphite using various ab initio methods. The inclusion of nonlocal exchange-correlation effects within the $GW$ approach strongly renormalizes the square EPC of the ${\text{A}}_{1}^{\ensuremath{'}}$ $\mathbf{K}$ mode by almost 80%…
Graphene's remarkable mechanical and electrical properties, combined with its compatibility with existing planar silicon-based technology, make it an attractive material for novel computing devices. We report the development of a nonvolatile memory element based on graphene break junctions. Our devices have demonstrat…
In this review a systematic analysis of the potential energy landscape (PEL) of glass-forming systems is presented. Starting from the thermodynamics, the route towards the dynamics is elucidated. A key step in this endeavor is the concept of metabasins. The relevant energy scales of the PEL can be characterized. Based…
With increasing production and application of carbon nanotubes (CNTs), it becomes necessary to understand the interaction between CNTs and aromatic compounds, an important group of organic contaminants and structural components of large organic molecules in biological systems. However, so far few experimental studies…
We compute the optical conductivity of graphene beyond the usual Dirac-cone approximation, giving results that are valid in the visible region of the conductivity spectrum. The effect of next-nearest-neighbor hopping is also discussed. Using the full expression for the optical conductivity, the transmission and reflec…
We describe here a simple, all-inorganic metal/NC/metal sandwich photovoltaic (PV) cell that produces an exceptionally large short-circuit photocurrent (>21 mA cm(-2)) by way of a Schottky junction at the negative electrode. The PV cell consists of a PbSe NC film, deposited via layer-by-layer (LbL) dip coating that yi…
Abstract The results of measurements of temperature and time dependencies of the dielectric constant of TlInS 2 in the temperature interval of successive incommensurate and commensurate phase transitions have been presented. Considerable decrease of the dielectric constant in a temperature interval including successiv…
Medium-sized double magic metal clusters, Al@Ag(54) (-) and Al@Cu(54) (-), are predicted based on unbiased global search and density functional calculation. Both bimetallic core-shell clusters have icosahedral symmetry, and they are much lower in energies than all other low-lying isomers. In contrast, the icosahedral…
The photoresponse of a diamond detector has been compared with a standard ionization chamber in x-ray absorption spectroscopy applications. A photoconductive device based on a nitrogen-doped single crystal diamond has been tested by synchrotron radiation. Time stability and linearity have been studied by x rays at 10…
Abstract We report on the structural and magnetic properties of the polycrystalline samples of Zn 1‐x Co x O (x = 0.05, 0.10 and 0.15) synthesized via sol‐gel route. The air sintered samples of all compositions exhibit paramagnetic behaviour at room temperature, on the other hand the same samples on annealing in Ar/H…
Abstract Derivatized poly(styrene‐ co ‐divinylbenzene) resins have been prepared from the commercial crosslinked polystyrene by the aromatic electrophilic substitution reaction using PCl 3 /AlCl 3 or PCl 5 /AlCl 3 , followed by base‐promoted hydrolysis. The unmodified copolymer and their phosphored derivatives have be…
We report on ultrafast charge carrier dynamics in sub-band-gap energy states in nanocrystalline diamond self-supporting membranes prepared by plasma-enhanced chemical vapor deposition technique. The obtained data are hence not influenced by the substrate effects. Results of the femtosecond transient transmission and p…
Nanocrystalline TiO2 (anatase) was studied over a particle size regime where both capacitive and lithium intercalation processes contribute to the total stored charge. Both the total stored charge (gravimetrically normalized) and the capacitive contribution to the stored charge increase with decreasing particle size.…
The rhombohedral-to-tetragonal (R-T) transformation in relaxor single crystals occurs over a temperature range, manifested by the coexistence of rhombohedral (R) and tetragonal (T) microscopic and nanotwin domains, a string of thermal current signals, and continued degradation of dielectric and electromechanical prope…
Abstract MgO nanotube clusters which cross sections are composed of two‐, three‐, four‐, and five‐membered rings are constructed and studied by the density functional theory at B3LYP/6‐31G( d ) level. The variations of bond length present anisotropic effect. Three‐membered ring nanotube cluster is the most stable tube…
Abstract In the present work, maleic anhydride was used for grafting polypropylene (PP) by a free radical reaction in the melt and subsequent blending with highly crystalline polyethylene terephthalate (PET), to determine how functionalization and blending influence their properties. The optimum conditions for the gra…