Materials Literature
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Structural changes proceeding in composites under the effect of various mechanical deformations (stretching, compression, shear, etc.) affect the structure of an electrical conducting system. Mechanical stresses, induced by deformation of composite materials during deformation, affect both the molecular and supermolec…
The miscibility of blends of bisphenol-A polycarbonate (BAPC) and tetramethyl bisphenol-A polycarbonate (TMPC) with copolymers of poly(styrene-co-4-hydroxystyrene) (PSHS) was studied in this work. It has been demonstrated that BAPC is miscible with PSHS over a region of approximately 45–75 mol % hydroxyl groups in the…
In the present article, a series of commercial-grade polypropylenes (PP) filled with different contents of short basalt fibers were studied. This composite material presented deterioration of both mechanical characteristics, for example, stress and strain at yield with increasing of the fiber content. On the other han…
Silver halide particles were synthesized in a water-in-oil microemulsion consisting of AOT (sodium bis-2ethylhexylsulfosuccinate)/ n -heptane/water. Different molecules of thiacyanines were adsorbed on these particles. These molecules can be adsorbed on the particles by two main sites of adsorption: either by an inter…
Using the continental-scale collections of the U.S. Geological Survey's National Water-Quality Assessment (NAWQA) Program, we examined selected members of the family Gomphonemataceae to expand the current state of knowledge of diatom taxonomy, morphology, and distribution. Ten taxa in the genera Gomphonema, Gomphoneis…
The ground-state properties of the tetranuclear Ni 2+ cluster [Ni 4 (H 2 O) 2 (PW 9 O 34 ) 2 ] 10 - were investigated by combining magnetic susceptibility and magnetization measurements with a detailed inelastic neutron scattering (INS) study on a fully deuterated sample of K 6 Na 4 [Ni 4 (H 2 O) 2 (PW 9 O 34 ) 2 ]·24…
The ground-state properties of the tetranuclear Co 2+ cluster [Co 4 (H 2 O) 2 (PW 9 O 34 ) 2 ] 10 - were investigated by combining specific heat, magnetic susceptibility, and magnetization measurements with a detailed inelastic neutron scattering (INS) study on a fully deuterated sample of K 10 [Co 4 (H 2 O) 2 (PW 9 O…
Powders of CdSe nanoparticles were prepared by a pulsed sonoelectrochemical technique. The crystal size could be varied from X-ray amorphous up to 9 nm (sphalerite phase) by controlling the various electrodeposition and sonic parameters. The mechanisms for the effects of the various parameters on particle size are dis…
We formulate a continuum model for aeolian sand ripples consisting of two species of grains: a lower layer of relatively immobile clusters, with an upper layer of highly mobile grains moving on top. We predict analytically the ripple wavelength, initial ripple growth rate and threshold saltation flux for ripple format…
The crystal and molecular structure and hydrogen bonding system in cellulose II have been revised using new neutron diffraction data extending to 1.2 Å resolution collected from two highly crystalline fiber samples of mercerized flax. Mercerization was achieved in NaOH/H 2 O for one sample and in NaOD/D 2 O for the ot…
Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) was used for the characterization of a partially transesterified poly(beta-hydroxyalkanoate), PHA, polymer produced by the bacterial strain Alcaligenes eutrophus using saponified vegetable oils as the sole carbon sources. The tr…
Interaction of biomaterials with blood components including neutrophils is responsible for some of the clinical complications that have occurred in cardiopulmonary bypass, hemodialysis, and ventricular assist procedures. The possibility of inhibiting the initial adhesion of neutrophils to biomaterials has been studied…
The distribution of site potentials in CuZn alloys is investigated using x-ray-excited photoelectron spectroscopy. A small `disorder broadening' of the core-level photoelectron spectra is observed for the alloys. Experimental results are compared with results of model and first-principles calculations.
${\mathrm{Si}}_{6}$ and ${\mathrm{Si}}_{7}$ are the two largest clusters with confirmed geometries experimentally. The apex atoms in the pentagonal bipyramidal structure for ${\mathrm{Si}}_{7}$ have a coordination number of 6, completely different from the tetrahedral structure of the diamond lattice, and never given…
Amorphous nitrogenated carbon films are prepared in a dual electron cyclotron resonance-radio frequency plasma from a mixture of methane and nitrogen gas. A marked variation of electronic properties and microstructure of the films as a function of nitrogen concentration is observed from Fourier transform infrared (FTI…
Ab initio electronic structure calculations, based on density-functional theory within the generalized gradient approximation, on ${\mathrm{LaSr}}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ are reported. The bulk electronic structure shows a gap in the minority-spin channel, while the Fermi energy lies at the bottom of the…
Anisotropic thermal diffusivity is examined in a cross-linked silicone elastomer deformed in simple elongation. Thermal diffusivity both parallel and perpendicular to the stretch direction is measured using an optical technique called forced Rayleigh scattering. The thermal diffusivity is found to increase linearly wi…
Acrylate monomers bearing side chains terminated in sulfur pentafluoride (−SF 5 ) groups have been synthesized. These monomers have been copolymerized into films with the conventional aliphatic acrylic monomer 2-hydroxyethyl methacrylate (HEMA) using neat cast mixed monomer films and photoinitiation. Depth-dependent s…
The frequency dependence of the interlayer conductivity of a layered Fermi liquid in a magnetic field that is tilted away from the normal to the layers is considered. For both quasi-one- and quasi-two-dimensional systems resonances occur when the frequency is a harmonic of the frequency at which the magnetic field cau…
Anionically polymerized six-arm star polystyrene samples with weight-average molecular weights M w of 5.6 × 10 4 −3.2 × 10 6 were studied by light scattering and viscometry in cyclohexane at different temperatures to determine their z -average mean-square radii of gyration (〈 S 2 〉 z ), second and third virial coeffic…