与超顺排碳纳米管薄膜相互浸润的高分子具有均匀的导电性、良好的生物兼容性、合适的力学性能,它在电热型致动器研究领域具有广阔的应用前景。在本文中,首先利用这种具有双层结构的复合材料制作了一个简单的U型小器件来展示电热致动器...与超顺排碳纳米管薄膜相互浸润的高分子具有均匀的导电性、良好的生物兼容性、合适的力学性能,它在电热型致动器研究领域具有广阔的应用前景。在本文中,首先利用这种具有双层结构的复合材料制作了一个简单的U型小器件来展示电热致动器的工作原理,在电热的作用下该小器件能够产生730°的卷曲。其次,本文介绍了一种具有旋转结构手臂状的致动器(人工手臂)。在低电场(小于41 V or 500 V/m)的作用下,该人工手臂能够产生大的形变(大于700°旋转,49.2%的长度收缩和26.4%的直径收缩)。所制作的人工手臂和U型小器件能够受电压(或电功率)的精确控制。该人工手臂能够握起4 g(自重的26倍)的重物,展示了一种新的抓取物体的方式,在仿生领域具有良好的应用前景。展开更多
The super-aligned carbon nanotube(SACNT)films reinforced copper(Cu)laminar composites with different orientationsof CNT ply were fabricated by electrodeposition.The results show that the tensile strength and yield str...The super-aligned carbon nanotube(SACNT)films reinforced copper(Cu)laminar composites with different orientationsof CNT ply were fabricated by electrodeposition.The results show that the tensile strength and yield strength of cross-ply compositewith5.0%(volume fraction)of SACNT reach maximum of336.3MPa and246.0MPa respectively,increased by74.0%and124.5%compared with pure Cu prepared with the same method.Moreover,the electrical conductivities of all the prepared composites areover75%IACS.The result of TEM analysis shows that the size of Cu grain and the thickness of twin lamellae can be reduced byadding SACNT,and the refining effect in cross-ply composites is more significant than that in unidirectional ply composites.Theenhanced strength of the Cu/SACNT composites comes from not only the reinforcing effect of SACNT films but also the additionalstrengthening of the Cu grain refinement caused by CNT orientation.展开更多
A new kind of laminar metal matrix nanocomposite（MMC） was fabricated by an electrodeposition process with copper and superaligned carbon nanotubes film（SACNT film）.The SACNT film was put on a titanium plate and th...A new kind of laminar metal matrix nanocomposite（MMC） was fabricated by an electrodeposition process with copper and superaligned carbon nanotubes film（SACNT film）.The SACNT film was put on a titanium plate and then a layer of copper was electrodeposited on it.By repeating the above process,the laminar Cu/SACNT composite which contains dozens or hundreds of layers of copper and SACNT films was obtained.The thickness of a single copper layer was controlled by adjusting the process parameter easily and the thinnest layer is less than 2 μm.The microscopic observation shows that the directional alignment structure of SACNT is retained in the composite perfectly.The mechanical and electrical properties testing results show that the tensile and yield strengths of composites are improved obviously compared with those of pure copper,and the high conductivity is retained.This technology is a potential method to make applicable MMC which characterizes high volume fraction and directional alignment of carbon nanotubes.展开更多
基金National Basic Research Program of China(2012CB932301)Natural Science Foundation of China(51572146)~~
文摘与超顺排碳纳米管薄膜相互浸润的高分子具有均匀的导电性、良好的生物兼容性、合适的力学性能,它在电热型致动器研究领域具有广阔的应用前景。在本文中,首先利用这种具有双层结构的复合材料制作了一个简单的U型小器件来展示电热致动器的工作原理,在电热的作用下该小器件能够产生730°的卷曲。其次,本文介绍了一种具有旋转结构手臂状的致动器(人工手臂)。在低电场(小于41 V or 500 V/m)的作用下,该人工手臂能够产生大的形变(大于700°旋转,49.2%的长度收缩和26.4%的直径收缩)。所制作的人工手臂和U型小器件能够受电压(或电功率)的精确控制。该人工手臂能够握起4 g(自重的26倍)的重物,展示了一种新的抓取物体的方式,在仿生领域具有良好的应用前景。
基金Project(20111080980) supported by the Initiative Scientific Research Program,Tsinghua University,ChinaProject(2013AA031201) supported by the High Technology Research and Development Program of China
文摘The super-aligned carbon nanotube(SACNT)films reinforced copper(Cu)laminar composites with different orientationsof CNT ply were fabricated by electrodeposition.The results show that the tensile strength and yield strength of cross-ply compositewith5.0%(volume fraction)of SACNT reach maximum of336.3MPa and246.0MPa respectively,increased by74.0%and124.5%compared with pure Cu prepared with the same method.Moreover,the electrical conductivities of all the prepared composites areover75%IACS.The result of TEM analysis shows that the size of Cu grain and the thickness of twin lamellae can be reduced byadding SACNT,and the refining effect in cross-ply composites is more significant than that in unidirectional ply composites.Theenhanced strength of the Cu/SACNT composites comes from not only the reinforcing effect of SACNT films but also the additionalstrengthening of the Cu grain refinement caused by CNT orientation.
基金Project(20111080980)supported by the Initiative Scientific Research Program,Tsinghua University,China
文摘A new kind of laminar metal matrix nanocomposite（MMC） was fabricated by an electrodeposition process with copper and superaligned carbon nanotubes film（SACNT film）.The SACNT film was put on a titanium plate and then a layer of copper was electrodeposited on it.By repeating the above process,the laminar Cu/SACNT composite which contains dozens or hundreds of layers of copper and SACNT films was obtained.The thickness of a single copper layer was controlled by adjusting the process parameter easily and the thinnest layer is less than 2 μm.The microscopic observation shows that the directional alignment structure of SACNT is retained in the composite perfectly.The mechanical and electrical properties testing results show that the tensile and yield strengths of composites are improved obviously compared with those of pure copper,and the high conductivity is retained.This technology is a potential method to make applicable MMC which characterizes high volume fraction and directional alignment of carbon nanotubes.
