Materials Literature
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The electronic properties of Mg-O divacancy defects at the MgO surface obtained by removing of a pair of O and Mg ions from terrace, step, or corner sites have been investigated using an embedded cluster model. Long-range polarization and lattice relaxation effects have been included through a shell model approach. It…
The mechanism for the failure of brittle materials during uniaxial compressive shockloading has been the subject of much discussion. In particular, the physical interpretation of the yield point, the Hugoniot elastic limit, remains poorly understood. It is additionally hypothesized that different materials display dif…
Interaction of ZnCl(2) with Hpko (Hpko, di-2-pyridyl-ketonoxime) results in the formation of a uninuclear Zn(Hpko)Cl(2) (1) compound or in a 12-membered tetranuclear metallacrown (OH)(2)[inv12-MC(Zn(II)N(pko))-4]Cl(2) (2) depending on the pH of the mother solution. The addition of H(3)shi (H(3)shi, salicylhydroxamic a…
Perovskites of the PbZr1−xTixO3 type are among the most important ferroelectric materials and highly active catalysts. The structural and electronic properties of PbTiO3, PbZrO3, and PbZr0.5Ti0.5O3 were examined using first-principles density-functional (DF) calculations with the local-density-approximation (LDA) or t…
Silver colloids are one of the extensively employed surface-enhanced Raman scattering (SERS) active substrates. To obtain the SERS effect, their aggregation upon addition of analyte is necessary. However, problems of instability and irreproducibility in the magnitude of the signal are caused by the formation of aggreg…
Sonochemiluminescence (SCL) of luminol due to a single bubble is studied through spectral measurement. No SCL was observed from a stable single bubble that emitted high-intensity sonoluminescence (SL). In contrast, SCL was observed under conditions of an unstable dancing bubble, where a bubble grows and ejects tiny bu…
An amphiphilic metallo-supramolecular polystyrene- block -poly(ethylene oxide) diblock copolymer containing a bis(2,2‘:6‘,2‘ ‘-terpyridine)ruthenium(II) complex (PS 20 -[Ru]-PEO 70 ) as a supramolecular connection between the two constituting blocks has been compared to the covalently bonded counterpart (PS 22 - b -PE…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTDispersion and Solubilization of Single-Walled Carbon Nanotubes with a Hyperbranched PolymerAlexander Star and J. Fraser StoddartView Author Information Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California…
The predictions of a nonequilibrium schematic mode-coupling theory developed to describe the nonlinear rheology of soft glassy materials have been numerically tested in a sheared binary Lennard-Jones mixture. In this Letter, we focus on the existence, behavior, and properties of an effective temperature T(eff) for the…
We have characterized the frictional properties of nanostructured (ns) carbon films grown by Supersonic Cluster Beam Deposition (SCBD) via an Atomic Force-Friction Force Microscope (AFM-FFM). The experimental data are discussed on the basis of a modified Amonton's law for friction, stating a linear dependence of frict…
We study the linear dynamic mechanical response of monodomain nematic liquid crystalline elastomers under shear in the geometry that allows the director rotation. The aspects of time-temperature superposition are discussed at some length and Master Curves are obtained between the glassy state and the nematic transitio…
The photocatalytic activity for water decomposition of RuO 2 -dispersed ZnGa 2 O 4 with an octahedrally coordinated Ga 3+ ion was studied in order to examine the photocatalytic properties of p-block metal oxides with d 10 configuration. ZnGa 2 O 4 was impregnated with Ru 3 (CO) 12 or Ru(C 5 H 7 O 2 ) 3 in THF and oxid…
Triangular silver nanoparticles ( approximately 100 nm wide and 50 nm high) have remarkable optical properties. In particular, the peak extinction wavelength, lambda(max) of their localized surface plasmon resonance (LSPR) spectrum is unexpectedly sensitive to nanoparticle size, shape, and local ( approximately 10-30…
Two-dimensional x-ray diffraction (XRD 2 ) refers to x-ray diffraction applications with two-dimensional (2D) detector and corresponding data reduction and analysis. The two-dimensional diffraction pattern contains far more information than a one-dimensional profile collected with the conventional diffractometer. In o…
Abstract The surface free energy of crosslinked photodefinable epoxy (PDE) was evaluated from the advancing contact angles measured by the sessile drop method. Poly(tetrafluoroethylene) (PTFE) was used as a reference material in the evaluation of the surface free energies by various models. Pure water, diiodomethane,…
Abstract The crystallization of a high‐density polyethylene was analyzed with differential scanning calorimetry (DSC) measurements. An intense transcrystallinity was observed at the contact between the polymer and the DSC pans. The modification of the crystallization kinetics induced by this phenomenon was studied as…
Abstract We report the results from tensile creep tests performed on an epoxy resin in the presence of carbon dioxide at different pressures ( P co 2 ) and at a constant temperature below the glass‐transition temperature. Time‐ P co 2 superposition was applied to the data to account for the plasticization effect becau…
Abstract For a more complete understanding of the toughening mechanism of polypropylene (PP)/ethylene‐propylene‐diene rubber (EPDM) blends, dynamic packing injection molding was used to control the phase morphology and rubber particle orientation in the matrix. The relative impact strength of the blends increased at l…
Abstract The influence of the elongation rate and temperature on the ultimate tensile properties of melt‐crystallized linear polyethylene solids was investigated, with a double‐edge‐notched specimen to avoid necking, in which uniform deformation could be assumed throughout the experiment. The data on ultimate properti…
Measurements of internal strain development during in-situ deformation of a textured magnesium alloy plate represent the first direct observations of intergranular (type II) strains, which allow for definitive statements about the magnitude of stresses within (i) parent grains when mechanical twins are beginning to fo…