Materials Literature
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Abstract Semiconductor nanorods have been synthesized by the use of surfactants. The nanorods of CuS, ZnS, CdS, CuSe, ZnSe, and CdSe have diameters in the 5–150 nm range and exhibit high aspect ratios, with lengths of up to several microns. By using a high surfactant concentration, nanotube‐like structures of CdS and…
Synthesis and curing behaviors of polyphenol from urushiol analogues have been examined. The analogues were synthesized by lipase-catalyzed esterification of 4-hydroxyphenethyl alcohol with unsaturated fatty acids, in which the primary hydroxy group was regioselectively acylated to give the phenol derivatives having t…
The development of auxospores and initial cells of the freshwater chain-forming diatom Ellerbeckia arenaria forma arenaria was studied using light and electron microscopy. Whether the auxospore mother cell is formed vegetatively (parthenogenesis) or through autogamy is still a matter for speculation. Because no signs…
Thermal expansion of the monoclinic nonlinear optical crystal BiB3O6 (bismuth triborate) was measured by dilatometry within the temperature range from 173 K to 573 K using single crystal samples of dimensions ∼7 x 7 x 8 mm3. The four independent tensor coefficients are given and the calculated loci of zero thermal exp…
Abstract A mesoporous MCM-41 aluminosilicate containing Au nanoparticles catalyst of high surface area and porosity has been conveniently prepared in a simple embedding approach.
The binary alloy phase ϵ-Ag7+xMg26–x with x ≈ 1 and small amounts of the β′-AgMg phase crystallize by annealing of Ag–Mg alloys with starting compositions between 24–28 At-% Ag at 390 to 420 °C. A model structure for the ϵ-phase consisting of a fcc packing of Mackay clusters was derived from the known structure of the…
Carbon-encapsulated cobalt nanoparticles are prepared over a range of temperaturesand partial pressures by CVD from cyclohexane on prepared substrates consisting of ground powders of SiO2 impregnated with Co(NO3)2 and (NH4)2Mo2O7. The encapsulated cobalt nanoparticles are freed from the incorporated SiO2 and molybdenu…
Cubic stabilized zirconia bicrystals with [110] symmetric tilt grain boundaries were fabricated by diffusion bonding of two single crystals with the composition of ZrO2-9.6mol%Y2O3. The structures of symmetric tilt small angle grain boundary and two types of symmetric tilt sigma3 grain boundaries with different grain…
Interaction of hydrogen atom with (5, 5) single-walled carbon nanotube (SWNT) has been studied over the collision energy range from 1 to 30 eV using a molecular dynamics simulation method. In the energy interval of 1–3 eV, the hydrogen atom can be chemisorbed on the outer wall of the SWNT, provided the impact point is…
Losses in piezoelectrics are approached by considering a description of direct stress–charge displacement hysteresis. Shortcomings of the usual loss models (viscous and Rayleigh, taken separately) are briefly demonstrated. Then, a mixed model for piezoelectric losses superimposing viscous and Rayleigh types of descrip…
Well‐defined La 2 Sn 2 O 7 with a phase‐pure pyrochlore structure was produced by hydrothermal synthesis at temperatures as low as 200°C. Production of phase‐pure La 2 Sn 2 O 7 requires a pH above 10, and higher pH accelerates the crystallization process. The synthesis produced spherical particles of average particle…
The rate of very slow crack growth in glass is measured by inducing small, controllable changes in the direction of propagation of Hertzian cone cracks at known times. After completion of a growth sequence, the sample is sectioned to reveal the fracture surface. The stress intensity factor at each stage of crack growt…
In this investigation, X‐ray diffractometry and 13 C NMR spectroscopy were used to characterize the effect of pH on the formation of gel and its thermal decomposition by the Pechini process. It was found that the major effect of pH was to destroy the esterification between citric acid (CA) and ethylene glycol, which i…
Lattice Monte Carlo simulations are used to calculate equilibrium properties of surfactant-solvent-silica liquid-crystal systems under no-polymerization conditions. The formation of a high-surfactant high-silica concentration phase in equilibrium with a dilute phase is observed when the surfactant-silica interactions…
Whole unstimulated saliva from two donors was investigated both with respect to adsorption characteristics and SDS‐induced elutability. Salivary protein adsorption onto hydroxyapatite (HA) discs was studied by means of in situ ellipsometry in the concentration range 0.1–20% saliva. The adsorbed amounts on HA were foun…
Abstract Catalytic oxidation of tartronic acid (TA) in water over a BiPt/C catalyst generates ketomalonic acid (KM) which polymerizes via ketone‐carbonyl to form the corresponding polyether, poly(ketomalonate) (PKM), preventing the competitive formation of KM‐hydrate available as reagent. Formation of the polyether (I…
A study of the effect of solute/solvent interactions on static and dynamic molecular hyperpolarizabilities (β and γ) of series of prototypical π-conjugated donor−acceptor chromophores is presented. The solvent effect was included via a recently proposed discrete quantum-mechanical Langevin dipoles/Monte Carlo method.…
Treatment of the mono-meso-substituted iron(II) octaethylporphyrin complexes, (py)2Fe(II)(meso-NO2-OEP), (py)2Fe(II)(meso-CN-OEP), (py)2Fe(II)(meso-HC(O)-OEP), (py)2Fe(II)(meso-Cl-OEP), (py)2Fe(II)(meso-OMe-OEP), (py)2Fe(II)(meso-Ph-OEP), and (py)2Fe(II)(meso-n-Bu-OEP), with hydrogen peroxide in pyridine-d5 at -30 deg…
The sintering behavior and surface microstructure of PbNi 1/3 Nb 2/3 O 3 –PbTiO 3 –PbZrO 3 (PNiNb‐PT‐PZ) ceramics were investigated. The PNiNb‐PT‐PZ ceramics with the stoichiometric composition and the addition of excess lead oxide (PbO‐rich ceramics) were sintered by liquid‐phase sintering in accordance with the solu…
A nanocomposite of dodecanethiol-passivated gold clusters and a silica aerogel has been synthesized. The gold particles were efficiently absorbed in a silica wet gel and the particles were not flushed out during sc-CO2 drying. This can lead to a very simple and efficient way to the production of devices with high nonl…