Materials Literature
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Abstract We report herein studies on the liquid crystalline behavior of a series of supramolecular materials that contain different ratios of two complementary symmetrically‐substituted alkoxy‐bis(phenylethynyl)benzene AA‐ and BB‐type monomers. One monomer has thymine units placed at either end of the rigid mesogenic…
Three internal friction peaks (${P}_{L}$, ${P}_{H}$, and ${P}_{C}$) are observed in the Ba substituted ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Ba}}_{x}{\mathrm{Mo}}_{2}{\mathrm{O}}_{9\ensuremath{-}\ensuremath{\delta}}$ samples ($x=0$, 0.05, 0.1, 0.15, and 0.2), among which ${P}_{L}$ and ${P}_{C}$ are of a relaxation…
We investigate both experimentally and theoretically, low-loss electron energy losses in brown type IIa monocrystalline diamonds both before and after high-temperature, high-pressure anneals which remove the brown colouration. We find additional losses within and near the band edge for brown diamond which are signific…
The FeAlO3 phase presents an orthorhombic symmetry (Pna21 space group) with a double combination of hexagonal and cubic closed packing of oxygen ions. In this phase, there are four distorted different cationic sites, promoting piezoelectricity, ferrimagnetism and magnetoelectric effects at low temperatures. In this wo…
We report a complete study of the properties of amplified spontaneous emission (ASE) of the merocyanine form of the photochromic system, 1‘,3‘-dihydro-1‘,3‘,3‘-trimethyl-6-nitrospiro[2 H -1-benzopyran-2,2‘-(2 H )-indole], under nanosecond excitation conditions. ASE line narrowing is clearly observed for excitation den…
We present a comprehensive numerical study of the effect of degree of polymerization, generation of dendron growth, length of dendron tether, and dendron grafting density on the conformational statistics of dendronized polymers. This class of supramolecular assembly promises to find application in a number of nanotech…
Melting is analyzed dynamically as a problem of localization at a liquid-solid interface. A Lindemann-like criterion of melting is derived in terms of particular vibrational amplitudes, which turn out to equal a universal quotient (about one-tenth) of the molecular spacing, at the interface. The near universality of t…
Gold threads were spontaneously generated at room temperature from a combined solution of aqueous HAuCl4 and triethylamine. Initially, some reduced gold nanoparticles were self-organized into one-dimensional (1D) nanowires, which then developed into three-dimensional (3D) microscale threads of gold. After aging, the s…
The dielectric permittivity as a function of temperature at frequencies from 10−2 to 105 Hz is studied and parameterized in the perovskite Ba(Ti0.675Zr0.325)O3 ceramics. The features characteristic of relaxor ferroelectrics are found, namely, the Lorenz-type temperature dependence at high-temperature slope of the real…
The characterization of the amplitude and sign of the Burgers vector of perfect or partial dislocations from large-angle convergent-beam electron diffraction (LACBED) patterns is now a routine technique following the original idea proposed by Cherns and Preston [Proceedings of ICEM-11, Kyoto, Japan, pp. 721–722 (1986)…
Electron optical experiments on Al foils have revealed individual dislocations in the interior of the metal. The arrangement and movement of individual dislocations have been observed. Most of the dislocations occur in the boundaries of a substructure, the diameter of the subrains being of the order of 1 μ or more. Ti…
We investigate the effect of interfacial stabilizer on charge transport in polymer-dispersed carbon nanotubes. Despite mechanical contact, samples with dispersant show poor conductivity, which we attribute to a robust interfacial layer between contacted nanotubes. In comparison, results obtained when nanotubes are mec…
The sound velocity propagating along [111] of LaCoO 3 has been measured from 4 to 580 K for longitudinal ( L ) and transverse ( T ) sounds with frequencies, f , of 10 to 100 MHz. A comparison of the data for the single-domain rhombohedral crystal with those for a twinned pseudocubic specimen reveals the anisotropy of…
We numerically study the interplay between heterogeneous dynamics and properties of negatively curved regions of the potential energy surface in a model glassy system. We find that the unstable modes of saddles and quasi-saddles undergo a localization transition close to the Mode-Coupling critical temperature. We also…
This study attempts to explore the value-added applications of corn gluten meal (CGM), the inexpensive byproduct from corn based ethanol industries. The byproducts, CGM, was plasticized using glycerol/ethanol mixture, denatured by the addition of guanidine hydrochloride (GHCl), and then blended with poly(ε-caprolacton…
We have computed the band broadening and the flow resistance in a series of apparently self-similar porous LC support structures, all having the same mean geometric ratios and external porosity, but with a decreasing scale and disturbed by a scale-independent variance on the size and position of the porous solid zone…
A generalized theory of Auger electron transfer processes in the interaction of ions with metal surfaces, including the previously ignored role of d electrons is presented. It is shown that a correct and accurate description of Auger neutralization has to account for the contribution of d electrons, as this is illustr…
Fourier transform infrared (FTIR) spectroscopy has been used to probe the organization of the organic fragments in lamellar bridged silsesquioxanes with organic substructures based on alkylene chains of various lengths and urea groups [O1.5Si(CH2)3NHCONH(CH2)nNHCONH(CH2)3SiO1.5] (n = 6, 8-12). The structure and interm…
The first observations of dislocations by TEM were published in 1956. Since then the technique has been developed into an indispensable tool for the materials scientist, not only for the characteri...
The transition temperature TC of multicomponent systems--ferromagnetic, superconducting, or ferroelectric--depends strongly on the atomic arrangement, but an exhaustive search of all configurations for those that optimize TC is difficult, due to the astronomically large number of possibilities. Here we address this pr…