TiO2 membranes were prepared on aluminum-alloy thin plates by electrophoretic deposition and dip coating in a colloid solution of TiO2, respectively. The photocatalytic activity of TiO2 membrane was compared using eth...TiO2 membranes were prepared on aluminum-alloy thin plates by electrophoretic deposition and dip coating in a colloid solution of TiO2, respectively. The photocatalytic activity of TiO2 membrane was compared using ethylene as reactant, and the crystal and morphological structure of the membrane were characterized by XRD and SEM. The results showed that a more compact membrane with high loading of TiO2 but lower photocatalytic activity of unit TiO2 mass was obtained by electrophoresis compared with dip coating method. The addition of polyethylene glycol (PEG) to the sol of TiO2 could improve the specific photocatalytic activity (ethylene conversion per unit mass TiO2 and unit area of membrane piece) of the electrophoresis-membrane prepared from the sol, but could not change the specific photocatalytic activity of the dip-coating membrane from the sol. The ethylene conversion on the electrophoresis membrane prepared from the sol containing PEG (50 g·L-1) was 9 times of that on the dip coating membrane. The effect of PEG on the properties of electrophoresis-membrane of TiO2 was attributed to the change of electrokinetic properties of sol. Addition of PEG decreased of colloid particles and the electroosmosis velocity of diffuse layer of colloid particles. These favored the formation of a low compact and porous membrane on the electrode in electric field, and thus increasing the availability of TiO2 in photocatalytic process.展开更多
Although in-situ growing carbon nanotubes （CNTs） on carbon fibers could greatly increase the matrix-dominated mechanical properties of carbon/carbon composites （C/Cs）, it always decreased the tensile strength of c...Although in-situ growing carbon nanotubes （CNTs） on carbon fibers could greatly increase the matrix-dominated mechanical properties of carbon/carbon composites （C/Cs）, it always decreased the tensile strength of carbon fibers. In this work, CNTs were introduced into unidirectional carbon fiber （CF） preforms by electrophoretic deposition （EPD） and they were used to reinforce C/Cs. Effects of the content of CNTs introduced by EPD on tensile property of unidirectional C/Cs were investigated. Results demonstrated that EPD could be used as a simple and efficient method to fabricate carbon nanotube reinforced C/Cs （CNT-C/Cs） with excellent tensile strength, which pays a meaningful way to maximize the global performance of CNT-C/Cs.展开更多
文摘TiO2 membranes were prepared on aluminum-alloy thin plates by electrophoretic deposition and dip coating in a colloid solution of TiO2, respectively. The photocatalytic activity of TiO2 membrane was compared using ethylene as reactant, and the crystal and morphological structure of the membrane were characterized by XRD and SEM. The results showed that a more compact membrane with high loading of TiO2 but lower photocatalytic activity of unit TiO2 mass was obtained by electrophoresis compared with dip coating method. The addition of polyethylene glycol (PEG) to the sol of TiO2 could improve the specific photocatalytic activity (ethylene conversion per unit mass TiO2 and unit area of membrane piece) of the electrophoresis-membrane prepared from the sol, but could not change the specific photocatalytic activity of the dip-coating membrane from the sol. The ethylene conversion on the electrophoresis membrane prepared from the sol containing PEG (50 g·L-1) was 9 times of that on the dip coating membrane. The effect of PEG on the properties of electrophoresis-membrane of TiO2 was attributed to the change of electrokinetic properties of sol. Addition of PEG decreased of colloid particles and the electroosmosis velocity of diffuse layer of colloid particles. These favored the formation of a low compact and porous membrane on the electrode in electric field, and thus increasing the availability of TiO2 in photocatalytic process.
基金supported by the Program of Introducing Talents of Discipline to Universities(No.B08040)the Ph.D Thesis Innovation Fund of NWPU(No.cx201214)+1 种基金the Key Grant Proiect of Chinese Ministry of Education(No.313047)the National Natural Science Foundation of China(Nos. 51275417.50832004 and 51202194)
文摘Although in-situ growing carbon nanotubes （CNTs） on carbon fibers could greatly increase the matrix-dominated mechanical properties of carbon/carbon composites （C/Cs）, it always decreased the tensile strength of carbon fibers. In this work, CNTs were introduced into unidirectional carbon fiber （CF） preforms by electrophoretic deposition （EPD） and they were used to reinforce C/Cs. Effects of the content of CNTs introduced by EPD on tensile property of unidirectional C/Cs were investigated. Results demonstrated that EPD could be used as a simple and efficient method to fabricate carbon nanotube reinforced C/Cs （CNT-C/Cs） with excellent tensile strength, which pays a meaningful way to maximize the global performance of CNT-C/Cs.
