Mesoporous TiO2 ceramic films have been prepared upon the Ti alloy substrate by the micro-arc oxidation (MAO) technology. To enhance the photo-catalytic property of the films, Eu2O3 particles were added into the elect...Mesoporous TiO2 ceramic films have been prepared upon the Ti alloy substrate by the micro-arc oxidation (MAO) technology. To enhance the photo-catalytic property of the films, Eu2O3 particles were added into the electrolyte solution of Na2CO3/Na2SiO3. Scanning electron microscope (SEM), energy dispersive (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) are employed to characterize the modified films. Diffuse reflectance spectra (DRS) test, photo-generated current test and photo decomposition test are applied to evaluate the photo-catalytic property of the modified films. The results show that Eu2O3 transformed into one-dimensional (1-D) nano-wires embedded within the composite film, and the film has high photo-catalytic property.展开更多
In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction co...In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction composites was evaluated using a constant speed friction tester. The results showed that the expanded graphite composite (EGC) displayed better lubricity in both the fading and the recovery processes. The wear rate of the EGC decreased by 22.43%more than that of the natural graphite composite (NGC). In the fading process, and the EGC enhanced the stability of the coefficient of friction. The recovery maintenance rate of the NGC was 4.66% higher than that of the EGC. It can be concluded that expanded graphite plays an important role in the formation of a stable contact plateau and can effectively reduce the wear.展开更多
Tuning porous structure of carbon nanomaterials has been found to be important for their performance enhancement in electrochemical energy storage applications. In this work we employed a natural nanomaterial kaolinit...Tuning porous structure of carbon nanomaterials has been found to be important for their performance enhancement in electrochemical energy storage applications. In this work we employed a natural nanomaterial kaolinite, which is abundant and cheap, as hard template to synthesis porous carbon nanomaterial. By tuning the structure of hard template kaolinite, we have achieved a template directed formation of holey carbon nanosheet/nanotube materials. This carbon nanomaterials with hierarchical in-plane and out-of-plane pores have shown electrochemical energy storage capacity of 286 F/g（equal to 314 F/cm^3） at 0.1 A/g and 85 F/g（equal to 93 F/cm^3） at 100 A/g, which is comparable to variety of reported carbon based electrochemical energy storage electrode materials.展开更多
Single phase of SrIrO_(3) powders and ceramics were obtained by solid-state chemical reaction method and spark plasma sintering(SPS)technique,respectively.Phase evolutions,characteristics,morphology and resistivity of...Single phase of SrIrO_(3) powders and ceramics were obtained by solid-state chemical reaction method and spark plasma sintering(SPS)technique,respectively.Phase evolutions,characteristics,morphology and resistivity of the samples were studied by using thermogravimetric analysis-differential scanning calorimetry(TG-DSC),X-ray diffractometry(XRD),field emission scanning electron microscopy(FESEM)and four-point probe method,respectively.The results showed that the reaction process to form SrIrO_(3) phase occurred between SrCO_(3) and IrO_(2) directly during the heating process.By using optimum fabrication conditions established from the TG-DSC results,single phase of SrIrO_(3) powders was synthesized at 800-1000℃.SrIrO_(3) ceramics were sintered by SPS technique at 1000-1100℃with a pressure of 30 MPa,showing a high relative density of 92%-96%and dense microstructure.The room-temperature resistivity of SrIrO_(3) ceramics was about 2×10^(-4)Ω×m.The present study can provide high-quality ceramic target for the preparation of SrIrO_(3) films in traditional physical vapor deposition(PVD)method.展开更多
文摘Mesoporous TiO2 ceramic films have been prepared upon the Ti alloy substrate by the micro-arc oxidation (MAO) technology. To enhance the photo-catalytic property of the films, Eu2O3 particles were added into the electrolyte solution of Na2CO3/Na2SiO3. Scanning electron microscope (SEM), energy dispersive (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) are employed to characterize the modified films. Diffuse reflectance spectra (DRS) test, photo-generated current test and photo decomposition test are applied to evaluate the photo-catalytic property of the modified films. The results show that Eu2O3 transformed into one-dimensional (1-D) nano-wires embedded within the composite film, and the film has high photo-catalytic property.
基金This work was financially supported by the National Key Research Program of China(2016YFA0201001)Major scientific and technological innovation in Hubei(2017AAA112 and 2018AAA015)+1 种基金the Open research project of the Ministry of Education's Engineering Research Center of Nano-Geo Materials(NGM2017KFO11)the laboratory open foundation of the 2016-2017 academic year(SKJ2018052).
文摘In this study, expanded graphite and natural graphite were introduced into resin-based friction materials, and the tribological behavior of the composites was investigated. The tribo-performance of the two friction composites was evaluated using a constant speed friction tester. The results showed that the expanded graphite composite (EGC) displayed better lubricity in both the fading and the recovery processes. The wear rate of the EGC decreased by 22.43%more than that of the natural graphite composite (NGC). In the fading process, and the EGC enhanced the stability of the coefficient of friction. The recovery maintenance rate of the NGC was 4.66% higher than that of the EGC. It can be concluded that expanded graphite plays an important role in the formation of a stable contact plateau and can effectively reduce the wear.
基金supported by the National Natural Science Foundation of China(Nos.21303129,5110218,51572103,51502272,21303080,41502030)the Fundamental Research Funds(Nos.CUG140620,CUGL150413,G1323511668,G1323511543)for the Central Universities,China University of Geosciences(Wuhan)+1 种基金Zhejiang Provincial Natural Science Foundation of China(Nos.LZ16E020001 and LQY18D020001)Open Project from Inner Mongolia Key Lab of Carbon Nanomaterials(No.MDK2017022)
文摘Tuning porous structure of carbon nanomaterials has been found to be important for their performance enhancement in electrochemical energy storage applications. In this work we employed a natural nanomaterial kaolinite, which is abundant and cheap, as hard template to synthesis porous carbon nanomaterial. By tuning the structure of hard template kaolinite, we have achieved a template directed formation of holey carbon nanosheet/nanotube materials. This carbon nanomaterials with hierarchical in-plane and out-of-plane pores have shown electrochemical energy storage capacity of 286 F/g（equal to 314 F/cm^3） at 0.1 A/g and 85 F/g（equal to 93 F/cm^3） at 100 A/g, which is comparable to variety of reported carbon based electrochemical energy storage electrode materials.
基金This work was financially supported by Hubei Provincial Nature Science Found of China(2011CDB331)State Key Laboratory of Advanced Technology for Materials Synthesis Processing(Wuhan University of Technology,2012-KF-3)the Fundamental Research Founds for National University,China University of Geosciences(Wuhan)(CUG120118).
文摘Single phase of SrIrO_(3) powders and ceramics were obtained by solid-state chemical reaction method and spark plasma sintering(SPS)technique,respectively.Phase evolutions,characteristics,morphology and resistivity of the samples were studied by using thermogravimetric analysis-differential scanning calorimetry(TG-DSC),X-ray diffractometry(XRD),field emission scanning electron microscopy(FESEM)and four-point probe method,respectively.The results showed that the reaction process to form SrIrO_(3) phase occurred between SrCO_(3) and IrO_(2) directly during the heating process.By using optimum fabrication conditions established from the TG-DSC results,single phase of SrIrO_(3) powders was synthesized at 800-1000℃.SrIrO_(3) ceramics were sintered by SPS technique at 1000-1100℃with a pressure of 30 MPa,showing a high relative density of 92%-96%and dense microstructure.The room-temperature resistivity of SrIrO_(3) ceramics was about 2×10^(-4)Ω×m.The present study can provide high-quality ceramic target for the preparation of SrIrO_(3) films in traditional physical vapor deposition(PVD)method.
