................................................................................................................................................ iii NOMENCLATURE .................................................................................................................................... ix ACRONYMS ................................................................................................................................................ x

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Engineering Database of Liquid Salt Thermophysical and Thermochemical Properties

The corrosive effects of 60 % NaNO3/40 % NaNO3 have been tested at 390 and 550 °C, in order to simulate the working conditions in two principal concentrated solar power (CSP) plants, on stainless steel (AISI 304, 430) and on a low-Cr alloy steel (T22) containing 2.25 % Cr. The corrosion rates were determined by gravimetric tests, measuring the weight gain during 2,000 h, identifying the corrosion products via scanning electron microscopy (SEM) and X-ray diffraction (XRD). Thereby, Fe2O3 and Fe3O4 were the most prominent products formed from the tests performed at 390 °C, being observed also the formation of some stable compounds due to the impurities of the salt, as magnesium ferrite (MgFe2O4) and NaFeO2. The study at 550 °C of stainless steels revealed a better behavior under corrosive environments than T22 steel, identifying the formation of FeCr2O4 protective spinels mainly. To complete the corrosion tests, thermo-physical studies were carried out in binary mixture, using DSC and TGA. Also the most important parameters of the salt before and after corrosion test were tested.

Molten Salt Corrosion of Stainless Steels and Low-Cr Steel in CSP Plants

The principle of polymer-controlled crystallization of inorganic materials has been successfully transferred to functional aromatic organic dyes, in this instance 3,4,9,10-perylenetetracarboxylic acid potassium salt (PTCAPS), after its single-crystal structure was determined. The cationic double hydrophilic block copolymer poly(ethylene glycol)-block-branched-poly(ethyleneimine) (PEG-b-PEI) was used as the polymer additive to modify the crystallization of PTCAPS. Ultralong hierarchically structured PTCAPS microbelts with constant width and thickness of each individual belt have been fabricated. The belts are a mesocrystalline assembly of primary nanoparticles with high-energy anionic {001} faces stabilized by polymer complexation. Polarization microscopy, X-ray diffraction, optical absorption spectra, and fluorescence spectra indicate the favorable orientation of the 1D microbelts in the close-stacking direction and reveal a specific 1D superstructure fluorescence. Electrical conductivity measurements per...

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Polymer-induced self-assembly of small organic molecules into ultralong microbelts with electronic conductivity.

Electrochemical noise analysis on the pit corrosion susceptibility of Mg-10Gd-2Y-0.5Zr, AZ91D alloy and pure magnesium using stochastic model

Complex dielectric and impedance behavior of magnetoelectric Fe2TiO5

Optoelectronic performance and artificial neural networks (ANNs) modeling of n-InSe/p-Si solar cell

Neural networks modeling for refractive indices of semiconductors

AC electrical conductivity and dielectric studies of bulk p-quaterphenyl

Structural and optical properties of p-quaterphenyl thin films and application in organic/inorganic photodiodes

The frequency and temperature dependence of ac conductivity, dielectric constant and dielectric loss of ZnIn2Se4 in a pellet form were investigated in the frequency range of 102–106 Hz and temperature range of 293–356 K. The behavior of ac conductivity was interpreted by the correlated barrier hopping (CBH) model. Temperature dependence of ac conductivity indicates that ac conduction is a thermally activated process. The density of localized states N(EF) and ac activation energy were estimated for various frequencies. Dielectric constant and dielectric loss showed a decrease with increasing frequency and an increase with increasing in temperature. The frequency dependence of real and imaginary parts of the complex impedance was investigated. The relaxation time decreases with the increase in temperature. The impedance spectrum exhibits the appearance of the single semicircular arc. The radius of semicircular arcs decreases with increasing temperature which suggests a mechanism of temperature-dependent on relaxation.

A.A. Attia

Papers

Optoelectronic performance and artificial neural networks (ANNs) modeling of n-InSe/p-Si solar cell

Neural networks modeling for refractive indices of semiconductors

AC electrical conductivity and dielectric studies of bulk p-quaterphenyl

Structural and optical properties of p-quaterphenyl thin films and application in organic/inorganic photodiodes

Dielectric and impedance spectral characteristics of bulk ZnIn2Se4