Materials Literature
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Concepts are presented for using negative refractive index (NRI) materials to design parabolic reflector telescopes and antennas with resolutions significantly better than the diffractions limit. The main question we are attempting to answer is can negative refractive material be used to improve performance of parabol…
Pd-metal graphite (Pd-MG) has a layered structure, where each Pd sheet is sandwiched between adjacent graphene sheets. DC magnetization and AC magnetic susceptibility of Pd-MG have been measured using a SQUID magnetometer. Pd-MG undergoes a superconducting transition at $T_{c}$ ($= 3.63 \pm 0.04$ K). The superconducti…
The orientation behavior of the three principal crystallographic axes, the a -, b -, and c -axes, was estimated in terms of the orientation distribution function for poly(butylene terephthalate) (PBT) crystallites with a triclinic unit cell. Despite a number of papers reported for the orientation of crytsallites, this…
Polymerization of 4-acetoxybenzoic acid (ABA) with 3,5-diacetoxybenzoic acid (DABA) was examined to create a novel morphology of poly( p -oxybenzoyl) (POB) by means of the phase separation of oligomers during polymerization. Polymerizations were carried out at a concentration of 1.0% in liquid paraffin at 320 °C. Poly…
Resistivity and magnetoresistance measurements have been performed on insulating icosahedral AlPdRe quasicrystal (QC) bar samples. At temperatures in the range , the resistivities follow a simple inverse temperature law: ρ(T) = ρ0/T(1.0 ± 0.1). Below 1 K, the resistivity of a weakly insulating sample exhibited a simpl…
Quantitative calculations of phonon lifetimes due to anharmonic three-phonon processes require knowledge of cubic anharmonic coupling coefficients. In order to determine the temperature dependence of phonon frequencies, anharmonic force constants of up to fourth order are needed. In polar crystals, the macroscopic ele…
Characterization of poly-3-hydroxybutyric acid (PHB) and poly-3-hydroxybutyric-co-valeric acid (PHBV, 13% valerate) in chloroform was performed using size exclusion chromatography coupled to a multi-angle light scattering detector (SEC-MALS). Absolute molar mass averages, molar mass distribution, and the radius of gyr…
A distribution of internal transverse magnetic fields has been observed in single molecule magnet ${\mathrm{Mn}}_{12}\ensuremath{-}\mathrm{BrAc}$ in the pure magnetic quantum tunneling (MQT) regime. Magnetic relaxation experiments at 0.4 K are used to produce a hole in the distribution of transverse fields whose angle…
An array of edge dislocation forms spontaneously in a Grandjean-Cano wedge filled by a smectic liquid crystal. In the vicinity of the smectic A to smectic C transition, these defects are visible under the microscope [R. B. Meyer, B. Stebler, and S. T. Lagerwall, Phys. Rev. Lett. 41, 1393 (1978)]. This paper deals with…
In the present work we generalize the dielectric breakdown model to describe dielectric breakdown patterns in both conductor-loaded and insulator-loaded composites. The present model is an extension of a previous one [F. Peruani et al., Phys. Rev. E 67, 066121 (2003)] presented by the authors to describe dielectric br…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTLyotropic Liquid Crystalline Properties of Poly(N,N'-di-n-hexylguanidine)Jeonghan Kim, Bruce M. Novak, and Alan John WaddonView Author Information Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695 Department of Polymer Science & Engineering…
In this study, we have investigated the singlet oxygen ((1)Delta(g)) generation mechanism using phthalocyaninatosilicon (SiPc) covalently linked to nitroxide radicals (NRs), and we succeeded in increasing the singlet oxygen quantum yield (Phi(Delta)) by linking the NRs. This originates from both an increase in the tri…
A novel terminal hydroxide containing dinuclear alumoxane LAl(OH)OAlL(OCH=N-tBu) (3; L = HC(CMeNAr)2, Ar = 2,6-iPr2C6H3) was prepared by treatment of aluminum dihydride LAlH2 (1) and tert-butyl isocyanate in the presence of trace amounts of water and alternatively from 1 and LAlH(OCH=N-tBu) (2) with water. Compound 2…
The spin dynamics of Sr-doped cobaltite ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CoO}}_{3}$ $(x=0.14$ and $x=0.4)$ has been investigated in both zero magnetic field and high field by NMR. The results are consistent with microscopically phase-separated regions of ferromagnetic and nonferromagnetic mat…
Li+-ion conducting glasses of (LiCl)x(LiPO3)1−x with high LiCl compositions up to x = 0.45 were prepared successfully by using a twin-roller quenching method. 7Li magic angle spinning (MAS) NMR spectra of the glasses showed a broad signal, and a linear dependence of the chemical shift on LiCl composition, x, was obser…
The electronic structure of pyrochlore-type ${\mathrm{Tl}}_{2}{\mathrm{Ru}}_{2}{\mathrm{O}}_{7},$ which undergoes a metal-semiconductor transition at ${T}_{t}\ensuremath{\sim}120\mathrm{K},$ has been studied by ultraviolet photoemission spectroscopy (UPS) and inverse-photoemission spectroscopy [bremsstrahlung isochrom…
We found an unusual negative thermal expansion in the simple perovskite ${\mathrm{MnF}}_{3}$ below the Neel point, where the spins are ordered in an A-type magnetic structure. The structure of ${\mathrm{MnF}}_{3}$ has been studied between 5 and 500 K using powder neutron and synchrotron diffraction. The structure rema…
A nonlinear model in the form of the Rayleigh-Plesset equation is developed for a gas bubble in an essentially incompressible elastic medium such as a tissue or rubberlike medium. Two constitutive laws for the elastic medium are considered: the Mooney potential, and Landau's expansion of the strain energy density. The…
Electrodeposition of NiFe 2 alloy from a non-aqueous ethylene glycol sulfate bath followed by electrochemical oxidation (anodization) of the alloy in an aqueous bath at room temperature is described as a novel electrochemical process to deposit spinel nanocrystalline NiFe 2 O 4 thin films on different conducting subst…
Very high-resolution inelastic x-ray scattering is employed to determine the dynamic response of the high-density crystalline water phases ice IX and ice XII in the $Q=2.0--15.5{\mathrm{nm}}^{\ensuremath{-}1}$ momentum transfer range. The spectra in the first and second Brillouin zone of the crystalline samples posses…