Materials Literature
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We show that a class of negative index $(n)$ materials has interesting anisotropic optical properties, manifest in the effective refraction index that can be positive, negative, or purely imaginary under different incidence conditions. With dispersion taken into account, reflection at a planar negative-index interface…
We present an atomistic investigation of the influence of strain on the electronic properties of quantum dots (QD's) within the empirical $s p^{3} s^{*}$ tight-binding (ETB) model with interactions up to 2nd nearest neighbors and spin-orbit coupling. Results for the model system of capped pyramid-shaped InAs QD's in G…
The two-gap model for superconductivity in MgB2 predicts that interband impurity scattering should be pair breaking, reducing the critical temperature. This is perhaps the only prediction of the model that has not been confirmed experimentally. It was previously shown theoretically that common substitutional impuritie…
We report the effects of microwave irradiation on both unpurified and purified iron-catalyzed high-pressure disproportionation (HiPco)-grown single-walled carbon nanotubes (SWNTs) in ultrahigh vacuum. Under microwave irradiation, we observe that unpurified HiPco SWNTs quickly reach temperatures of approximately 1850 °…
Kohn-Sham orbitals of face-centered cubic lithium fluoride are calculated in prototypical local-density approximations to the exchange-correlation functional. The symmetry analysis of these Bloch functions in a LCAO basis on a path Gamma-X-W-K-Gamma-L-W through the Brillouin Zone is compiled into a list of errata to s…
The synthesis, characterization, and reversible guest-exchange chemistry of a new porous magnetic material that orders ferrimagnetically at 60.5 K are described. The material, Co(5)(OH)(8)(chdc).4H(2)O (chdc = trans-1,4-cyclohexanedicarboxylate), contains tetrahedral-octahedral-tetrahedral Co(II)-hydroxide layers of c…
A single triggering event in the core of a dendrimer composed of two or more generations of multiple-release monomeric building blocks can induce the release of all end groups at the termini of the dendrimer (see schematic representation). Such multiple-release systems could find application, for example, in the field…
We study the beam reflection from a layered structure with a left-handed metamaterial. We predict a giant lateral (Goos-Hänchen) shift and splitting of the beam due to the resonant excitation of surface polaritons with a vortexlike energy flow between the right- and left-handed materials.
Inorganic/organic polyelectrolyte microcapsules (see diagram for synthetic approach) possess the advantages of inorganic materials (i.e., high mechanical stability) and of conventional polyelectrolyte microcapsules (i.e., the ability to control the release/uptake properties of the capsule shell by changing pH value an…
Docking the tails: The triggering of a single cleavage at the core of a new class of dendrimers (see, for example, the second generation dendron) results in a spontaneous chain fragmentation and the release all of the tail (reporter) units. Such dendrimers may be applied as a general platform for prodrugs or sensor mo…
We connected dislocation-based atomic-scale and continuum models of plasticity in crystalline solids through numerical simulations of dislocation intersections in face-centered cubic crystals. The results contradict the traditional assumption that strain hardening is governed by the formation of sessile junctions betw…
Abstract X‐ray photoelectron spectroscopy (XPS) has been used to characterize poly(3,4‐ethylene dioxythiophene)–poly(styrene sulfonate) (PEDT/PSS), one of the most common electrically conducting organic polymers. A correlation has been established between the composition, morphology, and polymerization mechanism, on t…
Development of β-NMR and β-NQR, Zhou Dong-Mei, Zheng Yong-Nan, Zhu Jia-Zheng, Xu Yong-Jun, Du En-Peng, Wang Zhi-Qiang, Luo Hai-Long, Yuan Da-Qing, Rong Chao-Fan, M. Mihara, M. Fukuda, K. Matsuta, T. Minamisono, Zhu Sheng-Yun
Computational formulae for the coefficients of the third-order spherical aberration and the second-order axial chromatic aberration are presented for an axially symmetric electrostatic electron mirror. A technique for eliminating the high-order derivatives of the potential axial distribution in mirror systems from the…
Abstract The problem of overly high contents of remnant monomers (free phenol and free formaldehyde) in phenolic foam was studied. Free phenol was characterized by iodimetry, and free formaldehyde was characterized by a hydroxylamine hydrochloride method. The effect of the phenol/formaldehyde molar ratios and the reac…
Abstract Double bonds reactive with active radical species were introduced onto the surface of carbon yarn by the plasma‐graft polymerization of adipic acid divinyl ester and ethylene glycol dimethacrylate monomers to increase the adhesive strength in the interface between the carbon yarn and a vinyl ester resin. The…
We calculate the excitonic transition energies and exciton binding energies in ZnO/Mg x Zn 1- x O quantum-well heterostructures with Mg composition x varied from 0.08 to 0.36. The effect of the exciton-phonon interaction on the exciton binding energies is taken into account in the model. For the ZnO/Mg 0.12 Zn 0.88 O…
Magnetic, transport, and electron magnetic resonance properties of ${\mathrm{Pr}}_{0.8}{\mathrm{Ca}}_{0.2}{\mathrm{MnO}}_{3}$ single crystals have been investigated. Two ferromagnetic transitions observed at ${T}_{C1}\ensuremath{\approx}130\mathrm{K}$ and ${T}_{C2}\ensuremath{\approx}60\mathrm{K},$ denote a long range…
Abstract Series of gel electrolytes based on thermoplastic polyurethane (PU) with different organic additives were prepared and studied. Structural characterization was carried out by differential scanning calorimetry (DSC), dynamic mechanical analyzer (DMA), scanning electron microscopy (SEM), and atomic force micros…
The present work deals with the comparative application of the CPSM (corrugated pore structure model), the α s plot and the pore connectivity methods for pore structure analysis and especially the detection of microporosity of a category of montmorillonite clays pillared with LaNiO x binary oxide. A quite good agreeme…