Materials Literature
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Mixtures of Zr(OH) 4 and ZrO 2 particles, ∼10 nm in size, were hydrothermally treated in 0.25–1.5 mol/L H 2 SO 4 solutions at a temperature of 200°C. After 3 h, very short ZrO 2 fibers, 10–30 nm in length, were obtained, with no other zirconium compounds observed. The particles grew with treatment time and resulted in…
Abstract Melt grafting of maleic anhydride onto elastomeric ethylene‐octene copolymer was carried out in a twin‐screw extruder, in the presence of dicumyl peroxide as an initiator. Dimethyl formamide was used as an inhibitor to reduce crosslinking and as a solvent for peroxide initiator. The aim of the work is to prod…
Temperature dependence of the structural parameters is investigated in LaCoO 3 that shows a spin state transition at T spin ∼100 K by means of high-resolution time-of-fight (TOF) neutron powder diffraction measurements. We have found that the structural parameters, such as, Co–O bond length d and Co–O–Co bondangle Θ,…
Versatile multifunctional castables can be installed using ramming, vibrating and self-flowing methods by changing the water content used during their preparation.
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 of speculation. Because no signs…
Atomic density and quasilattice constant of AlPdRe icosahedral quasicrystals decreases and slightly increases, respectively, with increasing concentration of transition metals, which have smaller atomic radii. Average atomic packing could not be described simply by rigid sphere packing, that is, the covalent nature of…
The present paper proposes a non-linear finite element model for the time response of a novel shape memory alloy (SMA) actuator. The actuator has a plane beam configuration composed of a matrix material with SMA sheets or wires embedded in and/or bonded to the matrix part. The finite element model can be used to analy…
Ramped high direct-voltage tests have proven to be an effective and nondestructive means for reducing in-service stator winding failures. The measured current versus applied voltage response obtained during these off-line tests can be used to detect cracks and fissures, moisture absorption, tape separations, conductiv…
A novel class of dendrons and dendrimers containing all-azobenzene units (up to 29 azobenzene groups) was designed and synthesized by the convergent method using a protected orthogonal AB(2) monomer (10) and tetra-functionalized core (11) as building blocks. The preparation of the key monomer (10) involved condensatio…
Hard amorphous silicon carbonitride coatings for wear resistance have been produced by d.c. plasma‐enhanced chemical vapour deposition on pure iron at 573 K. Compared with most plasma assisted processes work was conducted under a relatively high pressure of 130 Pa. The advantages of this technique are an amorphous fil…
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…