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。
Materials which can undergo extremely fast displacive transformations as well as very slow diffusive transformations are studied using a Ginzburg-Landau framework to understand the physics behind microstructure formation and time-temperature-transformation (TTT) diagrams. This simple model captures the essential featu…
The phenomenon of stochastic resonance (SR) has been mainly studied in one-dimensional systems with additive noise. We show that in higher dimensional systems and in the presence of multiplicative noise, a non-linear magnetic system with a strongly periodic current can show behavior similar to that of SR but only for…
Non-orientable nanostructures are becoming feasable today. This lead us to the study of spin in these geometries. Hence a physically sound definition of spin is suggested. Using our definition, we study the question of the number of different ways to define spin. We argue that the possibility of having more than one s…
Although the current production of oxide nanoparticles may be modest, the wide range of proposed applications and forecasted growth in production has raised questions about the potential impact of these nanoparticles on the environment and human health. Iron oxide nanoparticles have been proposed for an increasing num…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
In this work we present a detailed time-dependent density functional theory (TDDFT) investigation of the absorption and Raman spectra of a pyrazine molecule located at the junction between two Ag20 clusters. Surface-enhanced Raman scattering enhancements of the order of 10(6) have been found for the junction system, w…
Single-molecule vibrational Raman spectroscopy of malachite green adsorbed on planar metal surfaces is achieved by means of optical local-field enhancement provided by a scanning nanoscopic metallic tip. The single-molecule signature is evident from spectral diffusion and a discretization of Raman peak intensities. Th…
We report transport measurements through a single-molecule magnet, the ${\mathrm{Mn}}_{12}$ derivative $[{\mathrm{Mn}}_{12}{\mathrm{O}}_{12}({\mathrm{O}}_{2}\mathrm{C}\mathrm{\text{\ensuremath{-}}}{\mathrm{C}}_{6}{\mathrm{H}}_{4}\mathrm{\text{\ensuremath{-}}}\mathrm{SAc}{)}_{16}({\mathrm{H}}_{2}\mathrm{O}{)}_{4}]$, in…
A flexible and elastic carbon coil (see figure) has been fabricated using a continuous yarn of carbon nanotube arrays. The processed yarn is both elastic and pliable and can be freely manipulated and molded to any desired shape that is retained after heat treatment. Owing to their highly ordered macroscopic structures…
Upconverting lanthanide-doped nanocrystals were synthesized via the thermal decomposition of trifluoroacetate precursors in a mixture of oleic acid and octadecene. This method provides highly luminescent nanoparticles through a simple one-pot technique with only one preparatory step. The Er3+, Yb3+ and Tm3+, Yb3+ dope…
We report that nanoscale carbon particles (carbon dots) upon simple surface passivation are strongly photoluminescent in both solution and the solid state. The luminescence emission of the carbon dots is stable against photobleaching, and there is no blinking effect. These strongly emissive carbon dots may find applic…
This paper reports the results of an investigation on radial breathing vibrations of multiwall carbon nanotubes (MWNTs) embedded in an elastic matrix, based on a rigorous van der Waals (vdW) interaction which is dependent on the change of interlayer spacing and the radii of tubes. Each of the concentric tubes of MWNTs…
Polyaniline (PAn) emeraldine salts (PAn-Cl, PAn-Br, PAn-ClO4) were synthesized by the electrochemical method using different acids (HCl, HBr, HClO4). PAn salts in pellet form were used as sensors for organic (EtOH, CHCl3, C6H6) and inorganic (HCl, NH3) solvents. Electrical conductivity responses of PAns to five solven…
Work on the synthesis and characterization of well-ordered mesostructured SiO x N y thin films (MSONTFs) on silicon wafers is described in this paper. The MSONTFs, characterized by high surface area, good order and uniform mesopores, were prepared by thermally treating the calcined mesoporous silica thin films (MSTFs)…
The phenomenon of holographic light scattering in centrosymmetric crystals of sodiumnitroprusside is investigated by analyzing (1) the effect of light polarization and wavelength of pump- and readout beams, (2) the angular intensity distribution, and (3) the kinetics of scattered light. It is shown that the scattering…
The viscometric coefficient, kAB, characterizing the interaction of chemically dissimilar polymer segments was estimated from changes of the intrinsic viscosity of chitosan in “pseudosolvents,” i.e., dilute solutions of poly(ethylene glycol) (PEG) in a solution of 0.1 M acetic acid/0.2 M sodium acetate (1:1). The blen…
The morphology of polyaniline (PANI), granular or tubular, depends on the acidity conditions during the reaction rather than on the chemical nature of the acid. In reference to acetic acid in which media nanotubes had been observed, dichloroacetic acid (DCA) and trichloroacetic acid (TCA) were used to synthesize polya…
Abstract Summary: A simple quantitative model for the analysis of EFM images of three‐ or more‐component polymer blends is applied to determine the dielectric constants of the blend constituents. The value of the dielectric constant of PIPA calculated from the EFM images of POMA‐PIPA‐APP blend is determined in good ag…
Abstract— The development of materials for vertically aligned (VA) active‐matrix display technology is briefly reviewed and the newest generation of liquid crystals for this application is disclosed. These new materials possess a unique combination of high dielectric anisotropy Δε and low rotational viscosity γ 1 with…
Electronic structures of boron-nitride (BN) nanotubes and a BN cone-structure material were studied by using a high energy-resolution electron energy-loss spectroscopy (EELS) microscope. A trial of the whole electronic structure study of hexagonal BN (h-BN), which consists of flat BN honeycomb layers, was conducted by…