Materials Literature
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A set of ceramic samples based on silicon carbide with substantially varying integral porosity (from 1 to 10 %) was studied. The pore size distribution was examined by optical microscopy (for pores ranging from 10 mm to hundreds of microns in size), scanning electron microscopy (0.5 - 10 mm), and small-angle X-ray sca…
In order to elucidate the degradation mechanism of EPDM rubber caused by a amount of chlorine in city water, EPDM rubbers containing 2 kinds of carbon black (ie. HAF and FT) were employed and corroded in chlorine water, Their morphology changes before and after degradation were observed by SEM. The effect of the amoun…
Numerical simulations are performed to investigate the characteristics of the formation of alternate and multiple bars with the use of the NHSED2D model. The results of the simulations show reasonably good agreement with the results of the theoretical analysis and the experiments. It is found that periodic boundary co…
Young's modulus, E, Vickers hardness, Hv, crack initiation load, Lc, and fracture toughness, Kc, of 30RO-10Al2O3-60SiO2, B2O3, P2O5 (mol%) (RO: MgO, CaO, SrO, BaO) system glasses were measured and the compositional dependence of deformation and fracture behaviors was systematically evaluated. Vickers hardness Hv and E…
Misturas elastoméricas condutoras de eletricidade envolvendo copolímero tribloco poli(estireno-b-butadieno-b-estireno) (SBS) e polianilina dopada com ácido dodecilbenzenosulfônico (Pani.DBSA) foram obtidas por polimerização "in situ". Os filmes obtidos por moldagem por compressão mostraram baixo limiar de percolação,…
The water-soluble tetracationic meso-tetra(4-methylpyridyl)porphine (PO2) was incorporated in mixed Langmuir monolayers (LM) with the anionic surfactant sodium hexadecylsulfate (SHS) and stearic acid (SA). The stability of the monolayer and the molecular packing of PO2 vary with the surface pressure and amount of stea…
Corrosion behavior and mechanism of Al-10% Si alloy-coated steel produced by a melt-dipping method have been investigated in methanol containing NaCl, and HCOOH as contaminants. Immersion corrosion tests were performed in deaerated or aerated methanol with and without 0.1-30% 0.1% NaCl, and 0.1% HCOOH, and ex situ sur…
A basic problem of electrochemical engineering is the calculation of the shape of an electrochemical cell necessary to apply an arbitrary current distribution on a prescribed electrode geometry. However, despite practical interest, it appears that this problem has never been addressed theoretically. In this work, a nu…
Electrical double layer and electrochemical characteristics at the nanoporous \ncarbon | (C₂H₅)₄NBF₄ +acetonitrile interface have been studied by \nthe cyclic voltammetry and impedance spectroscopy methods. The value \nof zero charge potential (0.23 V vs. SCE in H₂O), the region of ideal polarizability
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Abstract Phenol blue is a merocyanine dye that may exist in resonance between two extreme forms, a neutral keto form and a zwitterionic, charge‐separated eno form. The keto form is stable in the gas phase, while the eno form can be stabilized by solvents. In this work, the bond‐length alternation is used to monitor th…
The control of crystal size and morphology in a potassium dihydrogen phosphate batch crystallization process is investigated. The process is represented by a multidimensional population balance and related differential-algebraic equations. These equations, solved using a high resolution method, are the basis for an op…
We investigate the non-trivial magnetization plateau at 1/4 of the saturation magnetization of S=1 spin ladder, especially with reference to recent experimental results on a new organic tetraradical 3,3',5,5'-tetrakis(N-tert-butylaminoxyl)biphenyl, abbreviated as BIP-TENO. We propose three mechanisms for the formation…
Thermodynamic analyses for the system ZnS:Ag (crystal)–S2(vapor) is performed. It turned out that it is impossible to receive hole conductivity in this system. In our experiment ZnS crystals covered by silver layer are silver doped by the mechanism of atom recoil during S+ ion implantation. The resistivity of obtained…
Lanthanum manganite, the air electrode material of solid oxide fuel cells, is well known for its complicated nonstoichiometry, which depends upon oxygen partial pressure and temperature. This nonstoichiometry has a relationship with electrode reactivity or the exchange current density because it affects the oxygen act…
The electrochemical impedance for infinite and finite diffusion processes was described, and the locus of the impedance was discussed through comparison of the experimental results with the theoretical ones. The charge transfer resistance Rct and the polarization resistance Rp were compared with the current i and the…
Intergranular and internal oxidation in slab reheating process for hot-rolling was investigated for ultra-low carbon steel with 0.01 mass% Si. Intergranular oxidation depth significantly increased at 1 473 K because of melting of Fe–Si–O complex oxides and decreased with increasing oxidation temperature at above 1473…
Six aluminum hydroxide adjuvants, poorly crystalline aluminum oxyhydroxide (AlOOH) were prepared using different thermal treatments of amorphous aluminum hydroxide (Al(OH)3) in an effort to increase the protein adsorption capacity. All of the adjuvants initially exhibited a higher protein adsorption capacity. However,…
This paper describes the method evaluating the appearance of fabric-wrinkling replicas objectively by image processing. Results indicate that the wrinkle can be reliably measured using the distribution of gray level and the ratio of surface area, the ratio of X-direction length and the one of Y-direction length of sur…
The characteristics of the reaction between hydrogen isotopes and uranium were investigated using depleted uranium from nuclear fuel manufacturing waste. Activation of the uranium was conducted by heating the experimental vessel to 450 ℃ under vacuum conditions, while the reaction temperature was room temperature. The…
The surface area of the individual phyllosilicates (clay minerals) in Athabasca oil sands determined from XRD crystallite size measurements was found to be comparable to the bulk surface area measured by ethylene glycol monoethyl ether adsorption. The primary phyllosilicates are kaolin and illite but the large surface…