Effect of chromium content on the corrosion resistance of ferritic stainless steels in sulfuric acid solution

Due to recent increases in the price of Ni, steel use is currently undergoing a global shift from austenitic stainless steels to ferritic stainless steels. In this study, the corrosion behavior of four types ferritic stainless steels with different Cr contents was investigated to study the effect of Cr content on the corrosion resistance in a sulfuric acid solution. The polarization curves of the ferritic stainless steel with the highest Cr content indicated the best corrosion resistance. No corrosion was observed for the stainless steel with 24 mass% Cr after a potential sweep based on ex-situ SEM images. Corrosion resistivity was improved for high Cr content (>24 mass%) stainless steel because it is considered to form a stable passivation layer

Crystal structure oriented carrier transport characteristic of triphenylamine derivative single crystal

Organic electronic materials used in organic photoreceptors for electrophotography are expected to be employed in many functional organic devices. Regarding the inferior mobility compared to inorganic semiconductors, in this study, an organic single crystal was prepared at a high rate and characterized. First, solubility and supersolubility curves of α-phenyl-4’-[(4-methoxyphenyl)phenylamino]stilbene (TPA) were measured. According to the data, the rapid crystal growth has been succeeded. Polarization microscope observation and XRD result confirmed that a single crystal is obtained. The results of a cyclic voltammogram and molecular orbital calculations showed that hole transport takes place in the crystal. On the surface of the obtained single crystal, Au parallel electrodes were vacuum deposited to measure its electric conductivity. Higher currents were observed on the long and short axes of the single crystal than that of the amorphous layer. Moreover, an anisotropic conductivity, in which the current in the long axis is greater than that in the short axes, was remarked. Consequently, the molecular stack of the crystal clarified by an XRD analysis and molecular electronic structure assessed by molecular orbital calculation well explain the anisotropic conductivity of the crystal

Crystal structure oriented carrier transport characteristic of triphenylamine derivative single crystal

Organic electronic materials used in organic photoreceptors for electrophotography are expected to be employed in many functional organic devices. Regarding the inferior mobility compared to inorganic semiconductors, in this study, an organic single crystal was prepared at a high rate and characterized. First, solubility and supersolubility curves of α-phenyl-4’-[(4-methoxyphenyl)phenylamino]stilbene (TPA) were measured. According to the data, the rapid crystal growth has been succeeded. Polarization microscope observation and XRD result confirmed that a single crystal is obtained. The results of a cyclic voltammogram and molecular orbital calculations showed that hole transport takes place in the crystal. On the surface of the obtained single crystal, Au parallel electrodes were vacuum deposited to measure its electric conductivity. Higher currents were observed on the long and short axes of the single crystal than that of the amorphous layer. Moreover, an anisotropic conductivity, in which the current in the long axis is greater than that in the short axes, was remarked. Consequently, the molecular stack of the crystal clarified by an XRD analysis and molecular electronic structure assessed by molecular orbital calculation well explain the anisotropic conductivity of the crystal