Materials Literature
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Investigation of the magnetic and transport properties of single-walled small-diameter carbon nanotubes embedded in a zeolite matrix revealed that at temperatures below 20 kelvin, 4 angstrom tubes exhibit superconducting behavior manifest as an anisotropic Meissner effect, with a superconducting gap and fluctuation su…
Mesophase induction was observed in binary mixtures of the liquid-crystalline lanthanum(III) dodecanoate and a nonmesomorphic lanthanide(III) dodecanoate. The compounds have the stoichiometry La x Ln 1 - x (C 11 H 23 COO) 3 (where x is the mole fraction of lanthanum, Ln = Nd, Eu, Ho, Tb, and Yb) and were characterized…
Abstract Free‐standing polyimide films are manufactured by the chemical imidization of linear, soluble polymeric precursors. The reactive solution is coated onto a heated substrate, peeled off after partial imidization, and then dried and cured as a free‐standing film. Adhesive bonds to the cast side of the final film…
Bicontinuous morphologies are ubiquitous in nature and occur at various length scales. Topological features of two such morphologies arising in an ordered block copolymer at equilibrium and a polymer blend during spinodal decomposition are measured from three-dimensional images. Interfacial curvature, coordination num…
Abstract Liquid‐crystalline epoxy resins were synthesized from 6‐hydroxy‐2‐naphthoic acid, which was used as a mesogenic component, with phenylhydroquinone or isosorbide and via a further reaction with (6‐bromo‐1‐hexyl)glycidylether, which was used as a flexible spacer. In this way, phenylhydroquinone‐bis‐6‐[6‐(glycid…
The sol−gel transition (SGT), upon which the infinite cluster (IC) of thermoreversibly bonded particles (gel fraction) appears against a background of a set of finite clusters (sol fraction), is quantitatively considered with due regard for large and complicated (mesoscopic) cycles inevitably present in the IC. To thi…
ADVERTISEMENT RETURN TO ISSUEPREVNotePreparation of Gold Nanoparticles from a Polyelectrolyte Complex Solution of Terthiophene AmphiphilesJi Ho Youk, Jason Locklin, Chuanjun Xia, Mi-Kyoung Park, and Rigoberto AdvinculaView Author Information Department of Chemistry, University of Alabama at Birmingham, Birmingham, Ala…
The π-radical cation as well as the dication species of a series of quinonoid π - extended TTF have been generated by means of time-resolved and steady-state radiation chemical techniques. The spectral characteristics of the π-radical cation revealed fingerprint absorptions, which are predominantly in the red region o…
Exciton characteristics of GaTe single crystals grown by vapor-phase transport were studied by optical measurements. A hydrogenlike exciton series up to $n=4$ was clearly observed in the absorption spectra at 2 K. In the $n=1$ exciton energy region three types of exciton lines were found. By analyzing microphotolumine…
The control of biodegradation and the improvement of moldability of poly- l -lactide, PLA, have been difficult because of the high crystallinity and the lability of melt viscosity. The synthesis of biodegradable PLA having the branched structure, comb-type PLA, was carried out by using only metabolizable materials to…
The mechanism of the B3/B1 phase transition of SiC has been investigated by periodic LCAO-DFT least-enthalpy calculations. A new transformation pathway, based on a Pmm2 orthorhombic intermediate state with two SiC units per cell, is found to be energetically favored over the traditional R3m mechanism. The computed act…
Time-resolved X-ray diffraction is utilized to follow phase transitions in nanostructured silica/surfactant composites in real time under hydrothermal conditions. The data allow us both to obtain kinetic parameters and to observe intermediate phases. In all cases, changes in the packing of the organic component of the…
Solid-state electrochemical cells based on oxygen-ion conduction (pure ionic or mixed ionic/electronic conductors) allow selective transport of oxygen (oxygen-ion conducting materials) in the form of ionic flux at high temperatures. Thus these systems can act as filters for molecular oxygen and can be used for both ge…
The merger of density-functional theory in the local density approximation (LDA) and many-body dynamical mean field theory (DMFT) allows for an ab initio calculation of Ce including the inherent 4f electronic correlations. We solve the DMFT equations by the quantum Monte Carlo (QMC) technique and calculate the Ce ener…
We report self-consistent {\it ab initio} calculations of structural and electronic properties for the B- and Mg-terminated MgB$_{2}$ (0001) surfaces. We employ ultra-soft pseudopotentials and plane wave basis sets within the generalized gradient approximation. The surface relaxations are found to be small for both B-…
An unusual quasi-two-dimensional heavy band mass van Hove singularity (vHs) lies very near the Fermi energy in MgCNi3, recently reported to superconduct at 8.5 K. This compound is strongly exchange enhanced and is unstable to ferromagnetism upon hole doping with 12% Mg --> Na or Li. The 1/4-depleted fcc (frustrated) N…
We report measurements on MgB2 up to ~40GPa. Increasing pressure yields a monotonous decrease of the lattice parameters and of the c/a ratio, but no structural transition down to parameters smaller than those of AlB2. The transition superconducting temperature also decreases with temperature in a sample dependent way.…
We investigate the equilibrium properties of arrays of coherent strained islands in heteroepitaxial thin films of bidimensional materials. The model we use takes into account only three essential ingredients : surface energies, elastic energies of the film and of the substrate and interaction energies between islands…
The scaling properties of the maximal height of a growing self-affine surface with a lateral extent $L$ are considered. In the late-time regime its value measured relative to the evolving average height scales like the roughness: $h^{*}_{L} \sim L^α$. For large values its distribution obeys $\log{P(h^{*}_{L})} \sim -A…
In the first part of the paper we show that the constraining potentials introduced to mimic entanglement effects in Edwards' tube model and Flory's constrained junction model are diagonal in the generalized Rouse modes of the corresponding phantom network. As a consequence, both models can formally be solved exactly f…