共 18 条
Magnetically Powered Flexible Metal Nanowire Motors
被引:342
作者:
Gao, Wei
[1
]
Sattayasamitsathit, Sirilak
[1
]
Manesh, Kalayil Manian
[1
]
Weihs, Daniel
[2
]
Wang, Joseph
[1
]
机构:
[1] Univ Calif San Diego, Dept Nanoengn, La Jolla, CA 92093 USA
[2] Technion Israel Inst Technol, Fac Aerosp Engn, IL-32000 Haifa, Israel
基金:
美国国家科学基金会;
关键词:
SILVER;
DECOMPOSITION;
D O I:
10.1021/ja1072349
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Fuel-free magnetically driven propulsion of flexible Au/Ag/Ni nanowires, with a gold 'head' and nickel 'tail', linked by a partially dissolved and weakened silver bridge, is described. The flexible bridge facilitates the cyclic mechanical deformations under an external rotating magnetic field. Under such a field the nickel segment starts to rotate, facilitating the rotation of the gold segment at a different amplitude, hence breaking the system symmetry and inducing the movement. Forward ('pushing') and backward ('pulling') magnetically powered locomotion and a precise On/Off motion control are achieved by tailoring the length of the nickel and gold segments and modulating the magnetic field, respectively. Efficient locomotion in urine samples and in high-salt media is illustrated. The new magnetic nanowire swimmers can be prepared in large scale using a simple template electrodeposition protocol and offer considerable promise for diverse practical applications.
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页码:14403 / 14405
页数:3
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