Papers by Author: Liang Hao

Abstract: The relationships between curvature, electric resistance, electric power and temperature of the 1-side and 2-side electric heating actuators of SiC_CVD/Al composite were investigated when these actuators were working repeatedly. It was found that the curvature during the heating process was smaller than that during the cooling process for these actuators. To reduce and stabilize the electric resistance of the actuators during repeating work, the ends of the exposed SiC_CVD fibers were polished and then sputtered with gold. The results showed that the process of polishing and sputtering with gold on the ends of fibers (PPSG) was benefit to reduce and stabilize the electric resistance of the 1-side actuator. A good reproducibility of the relationship between temperature and curvature for both the 1-side and the 2-side actuators during the cycles of heating and cooling processes was confirmed.

Abstract: A novel TiO₂/Cu composite photocatalyst thin film was successfully fabricated by 2-step Mechanical Coating Technique (2-step MCT). The composite photocatalyst thin film was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), among others. The formation process of Cu thin film and TiO₂/Cu composite photocatalyst thin film were also examined. The results revealed that the formation of Cu thin film can fall into the following stages: nucleation, growth of nuclei and connection, formation and thickening of continuous thin film, and the exfoliation of thin film. In addition, TiO₂/Cu composite thin film had a composite microstructure of TiO₂ islands coated on Cu thin film. Furthermore, the photocatalytic activity of TiO₂/Cu composite photocatalyst thin film was evaluated by measuring the degradation rate of methylene blue (MB). Enhancement on the photocatalytic activity of TiO₂ was confirmed. The improvement of the photocatalytic activity of TiO₂/Cu composite photocatalyst thin film should result from the increase of the charge separation efficiency and the mass increase of TiO₂ in the composite thin film.

Abstract: In the present study, the TiO₂-Ti compacts with Magneli phases Ti_nO_2n-1 were fabricated using the mixed powder of TiO₂ powder and addition Ti powder by spark plasma sintering (SPS). The composition and the crystal types of Magneli phases Ti_nO_2n-1 were examined. The results showed that various Magneli phases Ti_nO_2n-1 (single or multi Magneli phases) with the composition of Ti_1+yO_2-x were obtained. The Magneli phases Ti_nO_2n-1 were formed in the transformation from the mother phase rutile TiO₂ to TiO with increase in Ti addition fraction. In addition, the thermoelectric properties of the sintered compacts were also measured. The electrical resistivity of the sintered compacts decreased with increase in Ti addition fraction. The thermoelectric performance of the sintered compacts was improved by the formation of Magneli phases Ti_nO_2n-1 with the composition of Ti_1+yO_2-x.