Materials Literature
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The optical activity of composite films created by the photocatalytic reduction of silver or gold ions in TiO(2) upon irradiation by UV light has up to now been discussed in terms of the formation and light-induced destruction of distinct nanoparticles molded inside the porous nanocrystalline film. We present results…
By thermal oxidation of initially birefringent porous silicon, highly optically transparent films of porous silicon oxide are produced. These films exhibit strong in-plane birefringence, which is twice as high as that of crystalline quartz. The experimentally measured refractive indices for ordinary and extraordinary…
The surface fractal dimension, D , and pore size distribution of perovskite‐doped alumina membrane prepared via the sol–gel method were determined from their nitrogen adsorption isotherms. The D value was calculated using the Frenkel–Halsey–Hill method. The D value increased with increasing temperature due to membrane…
Magnetotransport properties are systematically investigated on Ca 3 Co 4 O 9 + δ single crystals with different carrier concentrations changed by oxygen content. The in-plane resistivity decreases rapidly with increasing carrier concentration. Large negative magnetoresistance was observed in all the single crystals. A…
The thermal decomposition of quaternary ethylammonium chloride, bromide, and iodide has been studied using the experimental techniques of thermal gravimetry coupled to Fourier transform infrared spectroscopy (TG-FTIR) and differential scanning calorimetry (DSC) as well as the density functional theory (DFT) and MP2 qu…
The filling of carbon nanotubes, which vary in diameter and morphology, is directly observed by molecular dynamics computer simulation with a potential model which thermodynamically favors a four-coordinate bulk crystal structure. Inorganic nanotube (INT) structures form which are based on percolating hexagonal nets.…
The Kovacs protocol, based on the temperature shift experiment originally conceived by A. J. Kovacs for glassy polymers, is implemented in an exactly solvable dynamical model. This model is characterized by interacting fast and slow modes represented, respectively, by spherical spins and harmonic oscillator variables.…
A new method for high-resolution analyses of hair surface charge density under ambient conditions is presented in this paper. Electrostatic force microscopy (EFM) is used here to analyze changes in surface charge density in virgin hair, bleached hair, and hair treated with a cationic polymer. The atomic force microsco…
A series of undoped and doped barium titanate powders were prepared and examined by: X‐ray diffraction, high‐resolution scanning electron microscopy, transmission electron microscopy, particle size, ζ‐potential, specific surface area, differential scanning calorimetry (DSC), impedance spectroscopy, and secondary‐ion m…
Stress–strain curves of (1− x )BiFeO 3 – x PbTiO 3 compositions with x =0.2, 0.3, and 0.35 were determined under uniaxial loading to assess the material's potential for domain switching. The composition with x =0.35 provides the highest remanent strain, with more than 0.2% coupled with a strong tendency to relaxation.…
The effect of additions of ≤1 mol% Al 2 O 3 on abnormal grain growth in BaTiO 3 sintered for periods of ≤60 min at 1350°C has been studied. Addition of ≤0.2 mol% Al 2 O 3 caused an increase in the nucleation and growth rates of abnormal grains, with further additions causing a decrease. This behavior is explained by i…
Eleven silicon phthalocyanines which can be grouped into two homologous series [SiPc[OSi(CH3)2(CH2)(n)N(CH3)2]2, n = 1-6 (series 1), and SiPc[OSi(CH3)2(CH2)3N((CH2)(n)H)2]2, n = 1-6 (series 2)] as well as an analogous phthalocyanine, SiPc[OSi(CH3)2(CH2)3NH2]2, were synthesized. The ground state absorption spectra, the…
Mono- and bis-oxadisilole-fused isobenzofurans were first synthesized and isolated. A series of mono-, bis-, and tris-oxadisilole-substituted acenes were then synthesized by benzyne Diels-Alder reactions with the isobenzofurans. The photophysical, redox, and thermal properties of these new acenes were characterized.
The kinetics and thermodynamics of lysozyme precipitation in ammonium sulfate solutions at pH 4 and 8 and room temperature were studied. X-ray powder diffraction (XRD) was used to characterize the structure of lysozyme precipitates. It was found that, if sufficient time was allowed, microcrystals developed following a…
The effects of different annealing atmospheres on the chemical surface structure of HfO 2 gate dielectric layers have been evaluated in terms of the improvement in the transconductance ( g m ), current on/off ratio ( I on / I off ), and carrier mobility (μ e ) of a back-gated ZnO nanowire field-effect transistor (FET)…
Heating in air of a selected mixture of a silicone resin and alumina nanoparticles in the temperature range 1200°–1500°C yielded dense, crack‐free mullite samples. Al 2 O 3 , due to its nanometric size, proved to be very reactive toward silica, deriving from the ceramization of the preceramic polymer, leading to the f…
ZnO nanorods have been prepared with sol–gel methods using zinc acetate dihydrate in ethanol in the presence of lithium hydroxide via alkaline hydrolysis. The electron transfer behaviour at the surface and interface in ZnO nanorods was investigated by means of the surface photovoltage technique. The influence of adsor…
We investigate the enhanced alignment of lamellar microdomains under an electric field by addition of lithium chloride (LiCl) into polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) copolymers. A significant increase of dielectric contrast resulting from the formation of lithium-PMMA complexes markedly reduces th…
We report on low-temperature measurements in a fully tunable carbon nanotube double quantum dot. A new fabrication technique has been used for the top-gates in order to avoid covering the whole nanotube with an oxide layer as in previous experiments. The top-gates allow us to form single dots and control the coupling…
Nonstoichiometric orthorhombic titanium oxides (TiO x ; x =1.86–1.94) prepared by reducing the anatase titanium oxide in H 2 at 950°C are found to show large thermoelectric power. Their Seebeck coefficients are in the range −0.060 to −0.518 mV/K, and theoretical discussions are made based on the assumption that the el…