Materials Literature
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Abstract The miscibility and the isothermal crystallization kinetics for PBT/Epoxy blends have been studied by using differential scanning calorimetry, and several kinetic analyses have been used to describe the crystallization process. The Avrami exponents n were obtained for PBT/Epoxy blends. An addition of small am…
CeCl 3 ·7H 2 O and GdCl 3 ·6H 2 O that were dissolved in water were precipitated with urea (NH 2 CONH 2 ) to produce matrix agglomerates for three‐component nano‐reactors. Mixing hexamethylenetetramine with dilute nitric acid resulted in the formation of well‐dispersed nano‐particles of cyclotrimetilene trinitramine (…
A novel multisite interaction potential, suitable for computer simulations of complex materials as liquid crystals or polymers, is proposed and parametrized. Its validation is achieved through Monte Carlo numerical experiments at constant temperature and pressure, performed on the p-n-phenyls series and a typical meso…
The ground-state structures of ${\mathrm{MgAlH}}_{5}$ and ${\mathrm{BaAlH}}_{5}$ have been subjected to full structural optimization considering 50 different potential atomic arrangements as inputs for accurate density-functional total-energy calculations. The experimentally known crystal structure and structural para…
Ordered gold nanoparticle arrays with high lateral density of 6.87 × 10 10 nanoparticles cm −2 , which are stable up to temperatures of 600 °C, were fabricated. To this end, nanoparticles formed by thermal vacuum evaporation of Au were immobilized within the pores of nanoporous silicon wafers prepared by block copolym…
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)…