Materials Literature
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A modified resonant cavity method was developed to evaluate the microwave dielectric properties of giant permittivity materials, which were difficult to determine accurately using previous methods. A small-sized sample was used for measurement in the present work, and the microwave dielectric properties could be measu…
We perform first-principles calculations of the lattice dynamics and the thermodynamic properties of $\mathrm{La}{\mathrm{Cl}}_{3}$ and $\mathrm{La}{\mathrm{Br}}_{3}$. Using density-functional perturbation theory, we obtain the Born effective charge tensors, the dielectric permittivity tensors, the phonon frequencies…
The pressure-induced changes in the optical properties of $\ensuremath{\beta}\text{\ensuremath{-}}{\mathrm{Na}}_{0.33}{\mathrm{V}}_{2}{\mathrm{O}}_{5}$ single crystals at room temperature were studied by polarization-dependent Raman and far-infrared reflectivity measurements under high pressure. From the changes in th…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Salvatore Coppola, Nino Grizzuti, George Floudas, Dimitris Vlassopoulos; Viscoelasticity and crys…
The effects of nitrogen substitutional doping in Stone-Wales (SW) defect on the transport properties of single-walled nanotubes are simulated by using density functional theory and nonequilibrium Green’s functions. It is found that the nitrogen in SW produces half-filled band near the Fermi level in which the electron…
Single crystal ESR data on ${(\mathrm{TMTTF})}_{2}X$ salts are presented. Taking advantage of the large dimensions of the crystals, skin effect is studied through the asymmetry of the ESR resonance lines. When the microwave magnetic field is perpendicular to the stacking axis, a very rich temperature dependence of thi…
Intermetalloid clusters: A theoretical study describes a new endohedral stannaspherene Mn@Sn12 (left in figure) and its dimer. The Mn doping produces a neutral cluster with a very high spin. Three isomers are characterised for the dimer in which the antiferromagnetic coupling between the two manganese centres is favou…
Functionalization of carbon nanotubes (CNTs) with polymers such as polyethyleneimine or nafion was found to not change the adsorption properties of gas molecules on CNTs, although functionalization can remarkably enhance the sensitivity of gas sensors. Charge transfer between adsorbed molecules and single-walled carbo…
Abstract The Solvent‐Mediated Anhydrous to Monohydrate Phase Transition (SMPT) of citric acid in water was monitored using in situ Raman spectroscopy and image analysis. The solid phase composition, solute concentration, and crystal size distribution were measured during experiments designed to investigate the differe…
The authors investigate the temperature dependence of exciton transfer from a single InGaN quantum well (QW) donor to colloidal CdS nanocrystal quantum dot acceptors and obtain an optimum transfer efficiency of 65% at 60K. Time and spectrally resolved measurements reveal that the transfer efficiency is dominated by th…
Amorphous carbon film/n-Si (a-C∕Si) junctions have been fabricated by direct current magnetron sputtering and their current-voltage (I-V) characteristics have been investigated. The results show that the gas pressure has a large effect on the reverse bias I-V characteristics of the junctions. For example, the reverse…
In this study, we devised an extension-induced mixer to disperse carbon nanotube (CNT) clumps into individual tubes by imposing extensional stress continuously and periodically. The rheological behavior of the CNT-dispersed suspension was investigated to examine whether the hydrodynamic dragging induces the dispersion…
Bulk Ge15Te83Si2 glass has been found to exhibit memory-type switching for 1mA current with a threshold electric field of 7.3kV∕cm. The electrical set and reset processes have been achieved with triangular and rectangular pulses, respectively, of 1mA amplitude. In situ Raman scattering studies indicate that the degree…
A quantitative assessment of c-axis oriented domains in a textured BaTiO3 (BT) single crystal has been carried out by polarized Raman microprobe spectroscopy. The relative intensity modulation of the Raman phonon modes has been theoretically modeled as a function of crystal rotation and linked to the volume fraction o…
We present magnetization and specific heat data as well as optical spectra of $\mathrm{Nd}{\mathrm{Cr}}_{3}{(\mathrm{B}{\mathrm{O}}_{3})}_{4}$ single crystals. At ${T}_{N}=8\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the magnetic and specific heat data imply long-range antiferromagnetic spin order of the ${\mathrm{Cr}}^{3…
Superparamagnetic behaviour: CoO nanosheets synthesised by a surfactant-free wet chemical route (see high-resolution morphology image in figure), exhibit superparamagnetic features different from their bulk counterparts. No distinct antiferromagnetic transition around 300 K is observed in the nanosheets (see spectra).
Abstract Layered double hydroxides with different cations in the layers, MgAl, ZnAl and CoAl, have been prepared. The solids were obtained by the coprecipitation method and then they were submitted to the microwave radiation in order to improve the crystallinity and minimize the particle size of the solids. The sample…
The discovery of a local buckling instability of a single-walled carbon nanotube (CNT) that is subjected to point loading in its flexural direction through molecular mechanics simulations via the MATERIALS STUDIO software package is reported in the letter. The sudden decrease of the stiffness of the CNT at the onset o…
Abstract HyperMacs are long chain branched analogues of hyperbranched polymers, differing only in the sense that they have polymer chains, rather than monomers between branch points. Although the building blocks for HyperMacs and AB 2 macromonomers can be well defined in terms of molecular weight and polydispersity, t…
Hexagonal ZnO nanodisks were grown on silicon-on-insulator substrates by vapor-transport method without catalysts. The resulting nanodisks possess ultrathin thickness (10–20nm) and most of them present vertical orientation on the substrate surface. Under optical excitation, these ultrathin nanodisks exhibit ultraviole…