After electrolytically etched pattern graining surface of aluminum alloy, it is shows that there are porous oxide film containing α Al 2O 3 and α Al 2O 3 by means of SEM XRD and XPS analysis. In the ditches, a...After electrolytically etched pattern graining surface of aluminum alloy, it is shows that there are porous oxide film containing α Al 2O 3 and α Al 2O 3 by means of SEM XRD and XPS analysis. In the ditches, anodic oxidation makes pore density and diameter larger than other areas, and causes more coloring metal depositing and mutual cross linking. The electrolytically etched pattern surface shows relative deeper color on the ditches and lighter color on other areas, so it can be used for decoration. Electrolytic coloring metal exists in forms of Ag colloid and Ag 2O. Both anodic oxidation and electrolytic coloring affect the surface microstructure of aluminum alloy.展开更多
To solve the problems generally encountered during the plasma electrolytic oxidation(PEO) of Al alloys with high Si content, a pretreatment of chemical etching was applied before the process. The influence of such pre...To solve the problems generally encountered during the plasma electrolytic oxidation(PEO) of Al alloys with high Si content, a pretreatment of chemical etching was applied before the process. The influence of such pretreatment was studied by SEM, EDS and XRD. The pretreatment presents a significant effect on positive voltage at the beginning stage of PEO, leading to higher voltage over the whole process. The difference between the positive voltages of non-etched and etched specimens decreases gradually with the increase of processing time. The pretreatment exhibits much less influence on the negative voltage. For the sample with surface pretreatment, the average growth rate of PEO coating is increased from 0.50 to 0.84 μm·min-1and the energy consumption is decreased from 6.30 to 4.36 k W·h·μm-1·m-2. At the same time, both mullite and amorphous Si O2 contents are decreased in the coating.展开更多
In the present work, osteoblast behavior on a hierarchical micro-/nano-structured titanium surface was investigated. A hi- erarchical hybrid micro-/nano-structured titanium surface topography was produced via Electrol...In the present work, osteoblast behavior on a hierarchical micro-/nano-structured titanium surface was investigated. A hi- erarchical hybrid micro-/nano-structured titanium surface topography was produced via Electrolytic Etching （EE）. MG-63 cells were cultured on disks for 2 h to 7 days. The osteoblast response to the hierarchical hybrid micro-/nano-structured titanium surface was evaluated through the osteoblast cell morphology, attachment and proliferation. For comparison, MG-63 cells were also cultured on Sandblasted and Acid-etched （SEA） as well as Machined （M） surfaces respectively. The results show signifi- cant differences in the adhesion rates and proliferation levels of MG-63 cells on EE, SLA, and M surfaces. Both adhesion rate and proliferation level on EE surface are higher than those on SLA and M surfaces. Therefore, we may expect that, comparing with SLA and M surfaces, bone growth on EE surface could be accelerated and bone formation could be promoted at an early stage, which could be applied in the clinical practices for immediate and early-stage loadings.展开更多
The anodic behavior of cerium （Ce） in A1C13-1-ethyl-3-methyl-imidazolium chloride （A1CI3-EMIC） ionic liquid has been investigated. Linear sweep voltammetry （LSV）, electrochemical impedance spectra （EIS）, Raman...The anodic behavior of cerium （Ce） in A1C13-1-ethyl-3-methyl-imidazolium chloride （A1CI3-EMIC） ionic liquid has been investigated. Linear sweep voltammetry （LSV）, electrochemical impedance spectra （EIS）, Raman spectra, scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDS） were carried out to state the process and mechanism during anodic reaction. The results show that Ce can be electrochemically oxidized and dissolved in the ionic liquid. The oxide film of Ce markedly affects its anodic behavior by blocking the dissolution of the underlying metal. Moreover. the dissolution of metal surface brings about the stripping of the oxide film on Ce, thus leading to an oxide free surface. This work demonstrates a theoretical foundation for electrolytic etching of Ce in ionic liquids,展开更多
The optical metal nanoantenna on thin film solar cell is effective to enhance light absorption. In this paper, the diamond-type Ag nanoantenna arrays are proposed for increasing the efficiency of solar cells by locali...The optical metal nanoantenna on thin film solar cell is effective to enhance light absorption. In this paper, the diamond-type Ag nanoantenna arrays are proposed for increasing the efficiency of solar cells by localized surface plasmons resonance(LSPR). The effect of metal nanoantenna on the absorption enhancement is theoretically investigated by the finite difference time domain(FDTD) method. Broadband absorption enhancements in both visible and near-infrared regions are demonstrated in case of solar cell with diamond-type Ag nanoantennas. The spectral response is manipulated by geometrical parameters of the nanoantennas. The maximum enhancement factor of 1.51 for solar cell is obtained. For comparison, the other three nanoantennas are also analyzed. The results show that the solar cell with optimized diamond-type nanoantenna arrays is more efficient in optical absorption.展开更多
文摘After electrolytically etched pattern graining surface of aluminum alloy, it is shows that there are porous oxide film containing α Al 2O 3 and α Al 2O 3 by means of SEM XRD and XPS analysis. In the ditches, anodic oxidation makes pore density and diameter larger than other areas, and causes more coloring metal depositing and mutual cross linking. The electrolytically etched pattern surface shows relative deeper color on the ditches and lighter color on other areas, so it can be used for decoration. Electrolytic coloring metal exists in forms of Ag colloid and Ag 2O. Both anodic oxidation and electrolytic coloring affect the surface microstructure of aluminum alloy.
基金Supported by the Natural Science Foundation of Guangdong Province,China(S2013010015211)
文摘To solve the problems generally encountered during the plasma electrolytic oxidation(PEO) of Al alloys with high Si content, a pretreatment of chemical etching was applied before the process. The influence of such pretreatment was studied by SEM, EDS and XRD. The pretreatment presents a significant effect on positive voltage at the beginning stage of PEO, leading to higher voltage over the whole process. The difference between the positive voltages of non-etched and etched specimens decreases gradually with the increase of processing time. The pretreatment exhibits much less influence on the negative voltage. For the sample with surface pretreatment, the average growth rate of PEO coating is increased from 0.50 to 0.84 μm·min-1and the energy consumption is decreased from 6.30 to 4.36 k W·h·μm-1·m-2. At the same time, both mullite and amorphous Si O2 contents are decreased in the coating.
文摘In the present work, osteoblast behavior on a hierarchical micro-/nano-structured titanium surface was investigated. A hi- erarchical hybrid micro-/nano-structured titanium surface topography was produced via Electrolytic Etching （EE）. MG-63 cells were cultured on disks for 2 h to 7 days. The osteoblast response to the hierarchical hybrid micro-/nano-structured titanium surface was evaluated through the osteoblast cell morphology, attachment and proliferation. For comparison, MG-63 cells were also cultured on Sandblasted and Acid-etched （SEA） as well as Machined （M） surfaces respectively. The results show signifi- cant differences in the adhesion rates and proliferation levels of MG-63 cells on EE, SLA, and M surfaces. Both adhesion rate and proliferation level on EE surface are higher than those on SLA and M surfaces. Therefore, we may expect that, comparing with SLA and M surfaces, bone growth on EE surface could be accelerated and bone formation could be promoted at an early stage, which could be applied in the clinical practices for immediate and early-stage loadings.
基金Project supproted by Discipline Development Foundation of China Academy of Engineering and Physics(2015B0301065)
文摘The anodic behavior of cerium （Ce） in A1C13-1-ethyl-3-methyl-imidazolium chloride （A1CI3-EMIC） ionic liquid has been investigated. Linear sweep voltammetry （LSV）, electrochemical impedance spectra （EIS）, Raman spectra, scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDS） were carried out to state the process and mechanism during anodic reaction. The results show that Ce can be electrochemically oxidized and dissolved in the ionic liquid. The oxide film of Ce markedly affects its anodic behavior by blocking the dissolution of the underlying metal. Moreover. the dissolution of metal surface brings about the stripping of the oxide film on Ce, thus leading to an oxide free surface. This work demonstrates a theoretical foundation for electrolytic etching of Ce in ionic liquids,
基金supported by the International Scientific and Technological Cooperation Projects of Guizhou Province in China(No.[2011]7035)
文摘The optical metal nanoantenna on thin film solar cell is effective to enhance light absorption. In this paper, the diamond-type Ag nanoantenna arrays are proposed for increasing the efficiency of solar cells by localized surface plasmons resonance(LSPR). The effect of metal nanoantenna on the absorption enhancement is theoretically investigated by the finite difference time domain(FDTD) method. Broadband absorption enhancements in both visible and near-infrared regions are demonstrated in case of solar cell with diamond-type Ag nanoantennas. The spectral response is manipulated by geometrical parameters of the nanoantennas. The maximum enhancement factor of 1.51 for solar cell is obtained. For comparison, the other three nanoantennas are also analyzed. The results show that the solar cell with optimized diamond-type nanoantenna arrays is more efficient in optical absorption.
