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Physical organogels of a 4- tert -butyl-1-arylcyclohexanol derivative ( BACOl ) are investigated. The small-angle scattering (SAS) technique (neutrons and X-rays) demonstrates that gel networks result from the entanglement of long, solidlike, and rigid fibers. The related cross-sections are shown to be circular ( r ≈…
Abstract
The SERS (surface-enhanced Raman scattering) and SERRS (surface-enhanced resonant Raman scattering) spectra of iron(II) phthalocyanine (FePc) adsorbed onto a silver electrode have been investigated. The electrochemical SERRS has shown that the reduction of FePc molecule is reversible at negative potentials below −1.0…
The 'double exchange' mechanism and Jahn—Teller instabilities are shown to account for the low-temperature properties of slightly doped LaMnO3 in the framework of the band insulator model. Analysis of the doping of La1-xAxMnO3 with divalent A atoms suggests that Coulomb forces cause holes to be localized near dopants,…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPolyelectrolyte Behavior of Astramol Poly(propyleneimine) DendrimersV. A. Kabanov, A. B. Zezin, V. B. Rogacheva, Zh. G. Gulyaeva, M. F. Zansochova, J. G. H. Joosten, and J. BrackmanView Author Information Polymer Science Department, Faculty of Chemistry, Moscow State University…
We have built an ab-initio LDA energy database with over 60 hypothetical extended structures of pure Boron, in each of which the coordination environment of each atom is equivalent. Focusing on eleven 6-coordinated structures, which are most relevant to the observed Boron phases, we deduce a nearest-neighbor-only 2-bo…
We report the direct measurement by video microscopy of the Van Hove function of quasi-two-dimensional colloidal suspensions. Under these conditions of confinement, the effective interparticle potential exhibits an intermediate range attractive component. This is obtained by deconvoluting the measured pair correlation…
We report a high energy and high angular resolution angle resolved photoemission study of $2H\ensuremath{-}{\mathrm{TaSe}}_{2}$ at temperatures both above and below the charge-density-wave (CDW) transition. In the normal state, an extended saddle band very close to the Fermi energy was observed. The CDW-induced energy…
The effect of substrate-induced lattice strains on the structural and magnetic properties of epitaxial barium ferrite (BaFe12O19) thin films is studied. The 5000 Å thick film shows a very narrow ferromagnetic resonance (FMR) line with a width of about 140 Oe. After appropriate annealing, the linewidth measured at 58 G…
3D domain swapping of proteins involves the interconversion of a monomer containing a single domain-domain interface and a 2-fold symmetrical dimer containing two equivalent intermolecular interfaces. Human glyoxalase I has the structure of a domain-swapped dimer [Cameron, A. D., Olin, B., Ridderström, M., Mannervik,…
${\mathrm{D}}_{3}{\mathrm{O}}^{+}$ and ${\mathrm{Cs}}^{+}$ ions $(\ensuremath{\le}1\mathrm{eV})$ were soft landed on vacuum-deposited amorphous water ice at 30 K. The samples charged capacitively with an initial dielectric constant of 2. Then the voltage was measured via a Kelvin probe while the sample temperature was…
The electronic structure, charge distribution, effective charge, and charge transfer in ferroelectric tetragonal are carefully studied using a local density functional potential and a self-consistent ab initio LCAO (linear combination of atomic orbitals) method. It is shown that the band gap and low-energy conduction…
1. Introduction. 2. Textile Testing: Methods and Performance Specifications. 3. Handling Data. 4. Environmental Conditions For Testing. 5. Textile Properties that Influence Performance. 6. Tensile Properties. 7. Abrasion and Wear. 8. Refurbishing, Shape and Dimensional Stability. 9. Appearance Retention: Wrinkle and S…
The d.c. conductivity and the electric a.c. response from 100 Hz up to 40 MHz of poly(3 n -decylpyrrole) were measured in the 80-330 K interval to characterize the charge transport behaviour of the system. The d.c. conductivity well fitted the variable range hopping model, and the loss factor, after having deducted th…
Here we demonstrate that the unusual thermodynamic behavior of water can be explained by a simple two-order-parameter Landau-type theory naturally and physically, without considering the effects of a liquid-liquid critical point. To describe the hydrogen-bonding effects on the phase behavior, we introduce a bond order…
A processing route has been developed to grow bundles of carbon nanotubes on substrates from methane and hydrogen mixtures by microwave plasma-enhanced chemical vapor deposition, catalyzed by iron particles reduced from ferric nitrate. Growth takes place at about 900 °C leading to nanotubes with lengths of more than 2…
We argue that the key parameter responsible for the exchange-correlation enhancement of the orbital magnetic moments in solids is ``Hubbard $U$'' rather than the intra-atomic Hund's second rule coupling, being consistent with a more general concept of the orbital polarization. This leads us to a unified rotationally i…
The structure of Brønsted acid sites and the effects of the Al → Si and Si → P substitution in chabazite and AlPO 4 -34 frameworks, respectively, have been studied by ab initio plane-wave calculations on periodic models. Geometry distortions remain well localized to the nearest neighborhood of the Brønsted acid site.…
We present x-ray photoemission spectra of the vanadium oxides , and , and their analysis in terms of a simple cluster model based on the Anderson impurity Hamiltonian. The electronic structure of these materials is characterized by a strong V 3d-O 2p hybridization energy which exceeds the energy scales related to on-s…
We argue that to explain recent resonant tunneling experiments on crystals of ${\mathrm{Mn}}_{12}$ and ${\mathrm{Fe}}_{8}$, particularly in the low-T limit, one must invoke dynamic nuclear spin and dipolar interactions. The low- $T$, short-time relaxation will then have a $\sqrt{t/\ensuremath{\tau}}$ form, where $\ens…