Materials Literature
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Cyanobiphenyls (nCB's) represent a useful and intensively studied class of mesogens. Many of the peculiar properties of nCB's (e.g., the occurrence of the partial bilayer smectic-A(d) phase) are thought to be a manifestation of short-range antiparallel association of neighboring molecules, resulting from strong dipole…
The Sr 1 - x La 1+ x Al 1 - x Mg x O 4 (0 ≤ x ≤ 0.7) solid solution with the K 2 NiF 4 structure has been prepared by a new “Chimie Douce” route for the first time. The crystal structures have been refined, from X-ray diffraction patterns, in a tetragonal lattice with the I 4/ mmm space group. The evolution of Raman a…
Abstract We report structural factors affecting the optical properties of blown polyethylene films. Two types of blown polyethylene films of similar degrees of crystallinity were made from (1) single‐site‐catalyst high‐density polyethylene (HDPE; STAR α) and (2) Ziegler–Natta‐catalyst HDPE (ZN) resins. The STAR α film…
The resistivity $\ensuremath{\rho}$ has been measured up to 900 K in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.15)$ single crystals to investigate the nature of charge transport phenomena both above and below the cooperative Jahn-Teller orbital-ordering temperature ${(T}_{\m…
We present crystalline structures for 60-, 256-, and 320-atom supercells of binary Lennard-Jones solids. These structures, based on cubic close packing, are much lower in energy than the disordered structures usually considered for this model glass former. We present a disconnectivity graph for a database of minima an…
<div class="htmlview paragraph">Vehicle weight reduction, reduced costs and improved safety performance are the main driving forces behind material selection for automotive applications. High strength steels (HSS) have demonstrated their ability to meet these demands and consequently have been the fastest growin…
The X-ray crystal structures of cationic, heptadentate lanthanide complexes of holmium and ytterbium bound to lactate are reported and the observed bidentate chelation in the solid state is consistent with near-IR CD (Yb) and solution NMR measurements; the complexes are shown to act as aqueous chiral derivatising agen…
Knowledge of the binding mechanisms of heavy metals to cement minerals is essential for the prediction of the long-term leachability of secondary building materials and cement-stabilized wastes containing heavy metals. In this study, the sorption of Zn(II) to calcium silicate hydrate (C-S-H(I)) in pre-equilibrated aqu…
The count of Lagrangian bonding constraints ${n}_{c}(y)$ in ternary ${\mathrm{Ge}}_{25}{\mathrm{S}}_{75\ensuremath{-}y}{\mathrm{I}}_{y}$ glasses $(0<y<0.30)$ is established from the molecular structure using Raman scattering and first-principles cluster calculations. The results show that ${n}_{c}(y)$ decreases…
Colossal magnetoresistive materials are perovskite-related mixed-valent (Mn 3+ /Mn 4+ ) manganese oxides that exhibit both spontaneous (at a Curie transition) and magnetic field-induced insulator−metal transitions. In concert with the dramatic changes in electrical conductivity, these oxides exhibit large lattice anom…
This paper describes a new class of composite materials designed by combining multiwall carbon nanotubes (MWNTs) and sol−gels. These materials provide new capabilities for the development of electrochemical devices by taking advantage of the favorable electrochemical characteristics of MWNTs. Further, variations in th…
We present and analyse a model for the spherical pulsations and translational motions of a pair of interacting gas bubbles in an incompressible liquid. The model is derived rigorously in the context of potential flow theory and contains all terms up to and including fourth order in the inverse separation distance betw…
Thin films of perovskite manganite La$_{0.7}$Ca$_{0.3}$MnO$_{3}$ were grown epitaxially on various substrates by either the pulsed laser deposition method or laser molecular beam epitaxy. The substrates change both the volume and symmetry of the unit cell of the films. It is revealed that the symmetry as well as the v…
Infrared spectra of a K4C60 single-phase thin film have been measured between room temperature and 20 K. At low temperatures, the two high-frequency T1u modes appear as triplets, indicating a static D2h crystal-field stabilized Jahn-Teller distortion of the (C60)4- anions. The T1u(4) mode changes into the known double…
We study domain growth properties of two species of particles executing biased diffusion on a half-filled square lattice, consisting of just two lanes. Driven in opposite directions by an external ``electric'' field, the particles form clusters due to steric hindrance. While strictly one-dimensional systems remain dis…
We developed a consistent mathematical model for isotropic crystal growth on a substrate covered by the mask material with a periodic series of parallel long trenches where the substrate is exposed to the vapor phase. Surface diffusion and the flux of particles from vapor are assumed to be the main mechanisms of growt…
Magnetic susceptibility $χ$ of pristine and brominated arc-produced sample of multiwall carbon nanotubes was measured from 4.2 to 400 K. An additional contribution $Δχ(T)$ to diamagnetic susceptibility $χ(T)$ of carbon nanotubes was found at T $<$ 50 K for both samples. It is shown that $Δχ(T)$ are dominated by quantu…
This paper concerns optical properties of the isotropic phase above the isotropic-cholesteric transition and of the blue phase BP III. We introduce an effective index, which describes spatial dispersion effects such as optical rotation, circular dichroism, and the modification of the average index due to the fluctuati…
Abstract The bulk magnetic susceptibility (BMS) shifts of 1 H NMR resonance signals for inert reference compounds caused by the addition of paramagnetic lanthanide(III) compounds were exploited in order to determine lanthanide(III) concentrations in solution. The BMS shifts of an inert reference compound in the sample…
The population of valence-band electronic states of single-walled carbon nanotubes (SWCNTs) was tuned electrochemically in acetonitrile electrolyte solution. In dry and oxygen-free solution, the electrochemistry of SWCNTs is controlled by capacitive charging. Reversible changes of intensity and frequency of the Raman…