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11 Jan 2010

Volume 96, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 96, 021101 (2010); http://dx.doi.org/10.1063/1.3290633 (3 pages)

Ahmet Ali Yanik, Min Huang, Alp Artar, Tsung-Yao Chang, and Hatice Altug
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Controlled directional growth of silver microwires on a solid electrolyte surface

Keng Hsu, Placid Ferreira, and Nicholas Fang

Appl. Phys. Lett. 96, 024101 (2010); http://dx.doi.org/10.1063/1.3291048 (3 pages) | Cited 1 time

Online Publication Date: 14 January 2010

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A silver microwire was formed on a silver sulfide surface in a directional and reversible manner. This wire formed upon applying an electric field between a tip-less atomic force microscopy probe placed on the Ag2S surface and a grounded silver electrode embedded in the surface. The process was studied in real-time with optical microscope and a discussion was provided on how the morphological instability was violated. A numerical model based on the mixed ionic-electronic transport was developed to study the observation and a good match of growth rates was found. The fast metal wire growth phenomenon observed here has potential in applications for electronics as well as plasmonic sensors and waveguides
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81.16.-c Methods of micro- and nanofabrication and processing
66.30.Dn Theory of diffusion and ionic conduction in solids
66.30.H- Self-diffusion and ionic conduction in nonmetals
82.45.Gj Electrolytes
07.10.Cm Micromechanical devices and systems
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices

A rolling locomotion method for untethered magnetic microrobots

Max T. Hou, Hui-Mei Shen, Guan-Lin Jiang, Chiang-Ni Lu, I-Jen Hsu, and J. Andrew Yeh

Appl. Phys. Lett. 96, 024102 (2010); http://dx.doi.org/10.1063/1.3291112 (3 pages) | Cited 4 times

Online Publication Date: 15 January 2010

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It is a challenge to achieve free and efficient motion of microrobots on arbitrary surfaces. We report a rolling locomotion method for a magnetic microrobot with a rectangular body (300×200×50 μm3); this method is based on an external rotating magnetic field. The magnetic force, accompanied by normal and friction forces, enables the successive rotations of the microrobot. A magnetic field with a rotational speed of 2 rps rolls the microrobot, giving it a translation speed of 1.4 mm/s. With this locomotion ability, microrobots can move along a line or curve and can climb slopes or stairs.
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45.40.Ln Robotics
07.07.Tw Servo and control equipment; robots
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