Pure zinc blende GaAs nanowires were grown by metal organic chemical vapor deposition on GaAs（111） B substrates via Au catalyzed vapor-liquid-solid mechanism.We found that the grown nanowires are rod-like in shape a...Pure zinc blende GaAs nanowires were grown by metal organic chemical vapor deposition on GaAs（111） B substrates via Au catalyzed vapor-liquid-solid mechanism.We found that the grown nanowires are rod-like in shape and have a pure zinc blende structure;moreover,the growth rate is independent on its diameters.It can be concluded that, direct impingement of vapor species onto the Au-Ga droplets contributes to the growth of the nanowire;in contrast,the adatom diffusion makes little contribution.The results indicate that the droplet acts as a catalyst rather than an adatom collector,larger diameter and high supersatuation in the droplet leads to the pure zinc blende structure of the nanowire.展开更多
In this study, biodegradable pure zinc wires with 3.0 mm and 0.3 mm in diameter were prepared via hot-extrusion and subsequent cold-drawing process respectively. The microstructure, mechanical performance, corrosion b...In this study, biodegradable pure zinc wires with 3.0 mm and 0.3 mm in diameter were prepared via hot-extrusion and subsequent cold-drawing process respectively. The microstructure, mechanical performance, corrosion behavior, in vitro cytocompatibility and antibacterial effect were comparatively studied.After cold-drawing, the mechanical property, especially the elongation of the ф0.3 mm pure Zn wire was improved significantly compared with the ф3.0 mm pure Zn wire. The in vitro corrosion study including immersion and electrochemical test showed acceptable corrosion resistance of these two materials in Hank's solution. The in vitro Human Umbilical Vein Endothelial Cells(HUVECs) viability assay showed obviously different results, in which the ф0.3 mm pure Zn wire demonstrated favorable cytocompatibility, while the ф3.0 mm wire exhibited severe cytotoxic effect with 100% extract concentration. Both of them exhibited partly antibacterial effect on S. aureus. These results demonstrated the feasibility of the prepared 0.3 mm pure Zn wire as the potential suture material with good absorbability.展开更多
基金Project supported by the Basic Research on Compatible Heterogeneous Integration and Functional-Microstructure Assemblage for the Development of Novel Optoelectronic Devices,China(No.2010CB327600)the 111 Program of China(No.B07005),the Program of Key International Science and Technology Cooperation Projects(No.2006DFB 11110)+3 种基金the New Century Excellent Talents in University (NCET-08-0736)the National High Technology R & D Program of China(Nos.2009AA03Z405,2009AA03Z417)the Chinese Universities Scientific Fund(Nos.BUPT2009RC0409,BUPT2009RC0410)the Program for Changjiang Scholars and Innovative Research Team in University,MOE(No.IRT0609).
文摘Pure zinc blende GaAs nanowires were grown by metal organic chemical vapor deposition on GaAs（111） B substrates via Au catalyzed vapor-liquid-solid mechanism.We found that the grown nanowires are rod-like in shape and have a pure zinc blende structure;moreover,the growth rate is independent on its diameters.It can be concluded that, direct impingement of vapor species onto the Au-Ga droplets contributes to the growth of the nanowire;in contrast,the adatom diffusion makes little contribution.The results indicate that the droplet acts as a catalyst rather than an adatom collector,larger diameter and high supersatuation in the droplet leads to the pure zinc blende structure of the nanowire.
基金supported by the National Natural Science Foundation of China (Grant No. 51431002)NSFC/RGC Joint Research Scheme (Grant No. 51361165101 and 5161101031)NSFC-RFBR Cooperation Project (Grant No. 51611130054)
文摘In this study, biodegradable pure zinc wires with 3.0 mm and 0.3 mm in diameter were prepared via hot-extrusion and subsequent cold-drawing process respectively. The microstructure, mechanical performance, corrosion behavior, in vitro cytocompatibility and antibacterial effect were comparatively studied.After cold-drawing, the mechanical property, especially the elongation of the ф0.3 mm pure Zn wire was improved significantly compared with the ф3.0 mm pure Zn wire. The in vitro corrosion study including immersion and electrochemical test showed acceptable corrosion resistance of these two materials in Hank's solution. The in vitro Human Umbilical Vein Endothelial Cells(HUVECs) viability assay showed obviously different results, in which the ф0.3 mm pure Zn wire demonstrated favorable cytocompatibility, while the ф3.0 mm wire exhibited severe cytotoxic effect with 100% extract concentration. Both of them exhibited partly antibacterial effect on S. aureus. These results demonstrated the feasibility of the prepared 0.3 mm pure Zn wire as the potential suture material with good absorbability.
