Materials Literature
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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…
Results of a study on nucleation kinetics, growth, and characterization of strontium tartrate trihydrate single crystals in silica hydrogel are described. The basic structure, composition, and perfection of the grown crystals were determined by XRD, EDAX, and laser scattering tomography. It was found that experimental…
The thermopower, S , of La 0.7 Ca 0.3 Mn 1− y Fe y O 3 ( y = 0–0.09), measured for T = 25–310 K and magnetic fields of B = 0–10 T, exhibits strong sensitivity to doping with Fe. The weak increase of S observed in the undoped material with lowering temperature is enhanced considerably in the sample with y = 0.03 until…
Poly- dl -lactide end-capped by a protected thiol was synthesized by bulk ring-opening polymerization (ROP) of dl -lactide initiated by the reaction product of aluminum isopropoxide [Al ( i OPr) 3 ] with α- (2,4-dinitrophenylsulfenyl) ethanol. After the thiol deprotection, PLA-SH was used to stabilize gold nanoparticl…
The high-temperature behavior of KH 2 PO 4 and RbH 2 PO 4 has been investigated by several methods. Simultaneous differential scanning calorimetry and thermal gravimetry, combined with evolved gas analysis, was carried out from 25 to 500 °C under ambient pressure. The initial dehydration events in KH 2 PO 4 and RbH 2…