Materials Literature
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On short time scales, the diffusion of mobile ions in glasses is nonrandom, i.e., the ions perform correlated forward-backward motions. By using linear response theory, we show in detail how typical distances characterizing the spatial extent of the nonrandom ionic diffusion can be derived from frequency-dependent con…
With the purpose of creating ZnO-based amorphous transparent conductors, a range of amorphous films InGaoO3(ZnO)m (where m ≤ 4) was prepared using a pulsed-laser deposition method. The resulting films exhibited an optical bandgap of 2.8-3.0 eV, and an n-type electric conductivity of 170-400 Scm−1 at room temperature,…
The first time-dependent DFT study of the excited states of ZnPc is presented. The theoretical results provide an accurate description of the UV−vis and vacuum−UV spectra and prove to be in excellent agreement with gas-phase spectra and generally in line with deconvolution analyses of solution and Ar/matrix absorption…
Piezoelectric response nonlinearity is approached using the Preisach description of hysteretic systems as collection of distributed bistable units. The Preisach model and its recent physical interpretation in terms of moving domain wall in a stochastically described pinning field are reviewed. It is shown that such an…
Zircon crystals synthesized in a Li-Mo oxide melt and doped with trivalent lanthanides and Y (REE), both with and without P, were examined by single-crystal X-ray diffraction (XRD). REE are incorporated into the Zr site in the zircon structure, and some Zr appears to be displaced to the Si site. Crystals doped with mi…
Abstract This document is the first published by the IUPAC Commission on Macromolecular Nomenclature dealing specifically with liquid crystals. Because of the breadth of its scope, it has been prepared in collaboration with representatives of the International Liquid Crystal Society. The document gives definitions of…
NOESY-HSQC 3D-NMR and NOESY 2D-NMR techniques have been used on a 750 MHz spectrometer to study the chain conformations of different generation DAB dendrimers (poly[propylene imine] dendrimers) in chloroform and benzene solutions. The high-field multidimensional NMR techniques provided the chemical shift dispersion ne…
SiCO glasses prepared from sol–gel precursors via pyrolysis in argon at temperatures ranging from 1000° to 1400°C were studied by transmission electron microscopy (TEM), in conjunction with electron energy‐loss spectroscopy (EELS). EELS analysis showed that stoichiometric SiCO glass underwent phase separation, forming…
Electrochromic polymers capable of modulating both visible and infrared light are investigated here. Devices based on these materials can be reversibly switched from the neutral state to the p-doped state with a concomitant color change (see Figure) over a broad range of spectral energies.
Abstract Polytetrafluoroethylene (PTFE) was treated in a low‐power plasma using a series of feed gases (O 2 , Ar, N 2 and NH 3 ) and the resulting surface modifications were evaluated by x‐ray photoelectron spectroscopy, static secondary ion mass spectroscopy, dynamic contact angle measurements and atomic force micros…
A spray drying method was used to produce a silica powder that contained ordered mesopores. A colloidal mixture of silica nanoparticles and polystyrene latex nanoparticles was mixed and sprayed as droplets into a vertical reactor that contained two temperature zones. The solvent in the droplets was evaporated at the f…
This letter presents the first direct measurement of the length scale of dynamic heterogeneity in a low molecular weight glass former without the perturbing effect of probe molecules or confinement. Using a multidimensional C13 solid-state exchange NMR experiment, 1 nm heterogeneities were found in glycerol for temper…
Crystal electric fields for the cubic point groups are reexamined and it is found that the new term O 6 2 - O 6 6 is nonvanishing for the cubic point groups T h and T due to the lack of Umklappung and fourfold symmetry axis of the point group O h . The eigenfunctions and eigenvalues of the crystal electric field for 4…
Carbon nanotubes (CNTs) were successfully synthesized by using a modified pulsed laser deposition (PLD) process, in which the laser ejected carbon species were directly collected by silicon substrates. A catalyst layer is needed in this process. The morphology of catalyst clusters varies with the heat treatment proces…
The crystal structure of metastable tetragonal zirconia prepared via the alkoxide method has been investigated at temperatures up to 1473 K, to clarify the similarity between this metastable phase and the tetragonal phase at high temperature. The lattice constants, tetragonality, oxygen shift parameter, and equivalent…
Recently, a dislocation-free deformation mechanism was proposed by Kiritani et al. on the basis of a series of experiments where thin foils of fcc metals were deformed at very high strain rates. In the experimental study, they observed a large density of stacking fault tetrahedra but very low dislocation densities in…
We present Gibbs ensemble Monte Carlo simulations of monomer–solvent and polymer–solvent mixtures with soft interaction potentials, that are used in dissipative particle dynamics simulations. From the simulated phase behavior of the monomer–solvent mixtures one can derive an effective Flory–Huggins χ-parameter as a fu…
New nanocomposites based on a waterborne epoxy emulsion and a suspension of cellulose crystallites were prepared by film casting in order to obtain coatings displaying both flexibility and stiffness. Tunicin cellulose whiskers are attractive reinforcing fillers due to their high aspect ratio, large interface area, and…
This paper focuses on the features of harmonic distortion which may affect significantly the reliability of typical ac-power network equipment, such as low-voltage self-healing capacitors used for reactive power and harmonic compensation. Moreover, the effect of high-frequency pulse-like voltage generated by Adjustabl…
4'-n-Pentyl-4-cyanobiphenyl (5CB) is a room temperature nematic liquid crystal with a high positive dielectric anisotropy and a high chemical stability. Many experimental results concerning the elastic and dielectric constants of 5CB are available in the literature, although there is often no satisfactory agreement be…