Materials Literature
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One-dimensional arrays of Co 3 O 4 nanoparticles were obtained via the thermal treatment of cobalt oxalate nanorods, which were synthesized through a convenient solvothermal route. The optical properties of Co 3 O 4 nanoparticles were investigated. The optical absorption spectrum indicates that the direct band gaps of…
Monodisperse silver nanocubes with edge length of 55 +/- 5 nm were, for the first time, synthesized in water on the basis of HTAB-modified silver mirror reaction at 120 degrees C (HTAB, n-hexadecyltrimethylammonium bromide). The individual nanocube was crystallographically well defined with a single crystal bonded by…
Many pathogens that infect humans use cell surface carbohydrates as receptors to facilitate cell-cell adhesion. The hallmark of these interactions is their multivalency, or the simultaneous occurrence of multiple interactions. We have used a carbohydrate-functionalized fluorescent polymer, which displays many carbohyd…
Tubeless and open siphons operate without conduits, in the open, supported only by extensional stresses. Here, we demonstrate that the addition of silica nanoparticles in modest concentrations (on the order of 1% by weight) to an aqueous Poly(ethylene oxide) (PEO) solution of a moderately low concentration (0.5% by we…
Low-cost natural fibers, available in developing countries, have been studied as replacements for asbestos in fiber cement materials. Laboratory pulps prepared from commercial sisal, by-product sisal, banana strands, and eucalypt kraft residue are compared to Pinus radiata kraft pulp, a reinforcement already widely us…
Thin films of molybdenum oxide (MoO 3 ) were deposited by a physical vapour deposition method, i.e.the electron beam evaporation technique, using Corning 7059 microscopic glass and SnO 2 :F as substrates. The effects of annealing temperature on the structural, surface morphological and optical properties of the films…
The nonlinear optical properties of polyaminoborane, −(NH 2 −BH 2 ) N −, and polyiminoborane, −(NH−BH) N −, oligomers are studied by using ab initio schemes, taking explicitly into account the dynamic electron correlation effects. We report the evolution with chain length of the geometries, charges, dipole moments, po…
We use high-field magnetotransport to examine the relation between the Hall effects and the longitudinal resistance, ${R}_{xx}$, in digitally doped (Ga,Mn)As structures with hopping transport. The ordinary and anomalous Hall resistances, ${R}_{\mathrm{OH}}$ and ${R}_{\mathrm{AH}}$, display sublinear dependences on ${R…
The new ternary selenostannates Sr(4)Sn(2)Se(9) and Sr(4)Sn(2)Se(10) have been synthesized by heating the elements at 1023 K in an argon atmosphere. Their structures were determined by single-crystal X-ray methods. Sr(4)Sn(2)Se(9) crystallizes in a new structure type (Pbam, a = 12.042(2) A, b = 16.252(3) A, c = 8.686(…
Oxide ion conductivity in doped LaO X F 3 - 2 X was investigated. It was found that oxygen doped into LaF 3 can be mobile through introduced anion vacancy and LaO 0.6 F 1.8 exhibits the high oxide ion conductivity, which is comparable with those in doped Bi 2 O 3 -based oxides. The oxide ion conductivity in LaO 0.6 F…
Our measurements of the surface tension of charge‐stabilized TiO2 and SiO2 dispersions show that the surface tension of the dispersions is a function of the particle concentration. At lower concentrations, the adsorption of particles to the interface decreases the total free energy of the system which causes a decreas…
The structural characterization of a hydrogen-covered diamond(001) surface has been investigated by density-functional theory with the plane-wave pseudopotential method and the generalized gradient approximation. Structures with different hydrogen coverage, from one to two monolayers, are considered. The formation ene…
This study investigated the effect of cationic, anionic (saturated and unsaturated), and nonionic surfactants on the formation, morphology, and surface properties of silica nanoparticles synthesized by the ammonium‐catalyzed hydrolysis of tetraethoxysilane in alcoholic media. Results indicate that at a relatively low…
We report the results of crystallographic analysis of various complex heterophase states that occur around the morphotropic phase boundary in the relaxor-based $(1\ensuremath{-}x)\mathrm{Pb}({\mathrm{Mg}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}\text{\ensuremath{-}}x{\mathrm{PbTiO}}_{3}$ solid solutions at room tempe…
Hybrid polymer−semiconductor nanostructured films were obtained by co-electrodeposition of poly(vinyl acetate- co -crotonic acid) and CdS or CdTe nanoparticles (NPs) stabilized with 1-thioglycerol (TGL) or thioglycolic acid (TGA). Composite films were enriched with negatively charged NPs stabilized with TGA. Relative…
The author employs density functional theory to study colloidal interactions in solution. Hardcore Yukawa potentials with soft tails, either repulsive or attractive, are used to model colloid-solvent and solvent-solvent interactions. We analyze the effect of these interactions on the solvent-mediated potential of mean…
Polycrystalline Sr 2 FeMoO 6 samples are synthesized by an encapsulation technique under very low oxygen partial pressures utilizing the Fe/FeO redox couple as an oxygen getter. A route based on thermal decomposition of metal complexes, using ethylenediaminetetraacetic acid as the complexant, is developed to prepare a…
Oxygen-deficient h-BaTiO3 synthesized by noncontact processing exhibits a dielectric constant higher than 100 000 with a loss component of about 0.1 together with a weak temperature dependence in the range of 100 to 300 K. Dielectric constant dramatically dropped by 2 orders of magnitude below 70 K.
Thermal conductivity of a $(10,10)$ carbon nanotube filled with ${\mathrm{C}}_{60}$ fullerenes (or a peapod) is computed using direct molecular-dynamics simulations with the Tersoff-Brenner potential for $\mathrm{C}\text{\ensuremath{-}}\mathrm{C}$ bonding interactions and the van der Waals potential for nonbonding int…
High-quality epitaxial films of layered cobaltite Na 0.83 CoO 2 were successfully grown on (0001)-oriented α-Al 2 O 3 substrate by reactive solid-phase epitaxy using CoO epitaxial layer and NaHCO 3 powder. First, the thermal oxidation of the CoO film into Co 3 O 4 occurs at a lower temperature (300−500 °C), then a Na…